Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * |
| 4 | * This module enables machines with Intel VT-x extensions to run virtual |
| 5 | * machines without emulation or binary translation. |
| 6 | * |
| 7 | * MMU support |
| 8 | * |
| 9 | * Copyright (C) 2006 Qumranet, Inc. |
Nicolas Kaiser | 9611c18 | 2010-10-06 14:23:22 +0200 | [diff] [blame] | 10 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 11 | * |
| 12 | * Authors: |
| 13 | * Yaniv Kamay <yaniv@qumranet.com> |
| 14 | * Avi Kivity <avi@qumranet.com> |
| 15 | * |
| 16 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 17 | * the COPYING file in the top-level directory. |
| 18 | * |
| 19 | */ |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 20 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 21 | #include "irq.h" |
Zhang Xiantao | 1d737c8 | 2007-12-14 09:35:10 +0800 | [diff] [blame] | 22 | #include "mmu.h" |
Avi Kivity | 836a1b3 | 2010-01-21 15:31:49 +0200 | [diff] [blame] | 23 | #include "x86.h" |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 24 | #include "kvm_cache_regs.h" |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 25 | #include "cpuid.h" |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 26 | |
Avi Kivity | edf8841 | 2007-12-16 11:02:48 +0200 | [diff] [blame] | 27 | #include <linux/kvm_host.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/highmem.h> |
| 32 | #include <linux/module.h> |
Izik Eidus | 448353c | 2007-11-26 14:08:14 +0200 | [diff] [blame] | 33 | #include <linux/swap.h> |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 34 | #include <linux/hugetlb.h> |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 35 | #include <linux/compiler.h> |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 36 | #include <linux/srcu.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 38 | #include <linux/uaccess.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 39 | |
| 40 | #include <asm/page.h> |
| 41 | #include <asm/cmpxchg.h> |
Avi Kivity | 4e54237 | 2007-11-21 14:08:40 +0200 | [diff] [blame] | 42 | #include <asm/io.h> |
Eduardo Habkost | 13673a9 | 2008-11-17 19:03:13 -0200 | [diff] [blame] | 43 | #include <asm/vmx.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 44 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 45 | /* |
| 46 | * When setting this variable to true it enables Two-Dimensional-Paging |
| 47 | * where the hardware walks 2 page tables: |
| 48 | * 1. the guest-virtual to guest-physical |
| 49 | * 2. while doing 1. it walks guest-physical to host-physical |
| 50 | * If the hardware supports that we don't need to do shadow paging. |
| 51 | */ |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 52 | bool tdp_enabled = false; |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 53 | |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 54 | enum { |
| 55 | AUDIT_PRE_PAGE_FAULT, |
| 56 | AUDIT_POST_PAGE_FAULT, |
| 57 | AUDIT_PRE_PTE_WRITE, |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 58 | AUDIT_POST_PTE_WRITE, |
| 59 | AUDIT_PRE_SYNC, |
| 60 | AUDIT_POST_SYNC |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 61 | }; |
| 62 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 63 | #undef MMU_DEBUG |
| 64 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 65 | #ifdef MMU_DEBUG |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 66 | static bool dbg = 0; |
| 67 | module_param(dbg, bool, 0644); |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 68 | |
| 69 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) |
| 70 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 71 | #define MMU_WARN_ON(x) WARN_ON(x) |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 72 | #else |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 73 | #define pgprintk(x...) do { } while (0) |
| 74 | #define rmap_printk(x...) do { } while (0) |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 75 | #define MMU_WARN_ON(x) do { } while (0) |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 76 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 77 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 78 | #define PTE_PREFETCH_NUM 8 |
| 79 | |
Xudong Hao | 00763e4 | 2012-06-07 18:26:07 +0800 | [diff] [blame] | 80 | #define PT_FIRST_AVAIL_BITS_SHIFT 10 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 81 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 |
| 82 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 83 | #define PT64_LEVEL_BITS 9 |
| 84 | |
| 85 | #define PT64_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 86 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 87 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 88 | #define PT64_INDEX(address, level)\ |
| 89 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) |
| 90 | |
| 91 | |
| 92 | #define PT32_LEVEL_BITS 10 |
| 93 | |
| 94 | #define PT32_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 95 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 96 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 97 | #define PT32_LVL_OFFSET_MASK(level) \ |
| 98 | (PT32_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 99 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 100 | |
| 101 | #define PT32_INDEX(address, level)\ |
| 102 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) |
| 103 | |
| 104 | |
Avi Kivity | 27aba76 | 2007-03-09 13:04:31 +0200 | [diff] [blame] | 105 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 106 | #define PT64_DIR_BASE_ADDR_MASK \ |
| 107 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 108 | #define PT64_LVL_ADDR_MASK(level) \ |
| 109 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 110 | * PT64_LEVEL_BITS))) - 1)) |
| 111 | #define PT64_LVL_OFFSET_MASK(level) \ |
| 112 | (PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 113 | * PT64_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 114 | |
| 115 | #define PT32_BASE_ADDR_MASK PAGE_MASK |
| 116 | #define PT32_DIR_BASE_ADDR_MASK \ |
| 117 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 118 | #define PT32_LVL_ADDR_MASK(level) \ |
| 119 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 120 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 121 | |
Gleb Natapov | 5316622 | 2013-08-05 11:07:14 +0300 | [diff] [blame] | 122 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | shadow_user_mask \ |
| 123 | | shadow_x_mask | shadow_nx_mask) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 124 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 125 | #define ACC_EXEC_MASK 1 |
| 126 | #define ACC_WRITE_MASK PT_WRITABLE_MASK |
| 127 | #define ACC_USER_MASK PT_USER_MASK |
| 128 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) |
| 129 | |
Avi Kivity | 90bb6fc | 2009-12-31 12:10:16 +0200 | [diff] [blame] | 130 | #include <trace/events/kvm.h> |
| 131 | |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 132 | #define CREATE_TRACE_POINTS |
| 133 | #include "mmutrace.h" |
| 134 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 135 | #define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
| 136 | #define SPTE_MMU_WRITEABLE (1ULL << (PT_FIRST_AVAIL_BITS_SHIFT + 1)) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 137 | |
Avi Kivity | 135f8c2 | 2008-08-21 17:49:56 +0300 | [diff] [blame] | 138 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
| 139 | |
Takuya Yoshikawa | 220f773 | 2012-03-21 23:49:39 +0900 | [diff] [blame] | 140 | /* make pte_list_desc fit well in cache line */ |
| 141 | #define PTE_LIST_EXT 3 |
| 142 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 143 | struct pte_list_desc { |
| 144 | u64 *sptes[PTE_LIST_EXT]; |
| 145 | struct pte_list_desc *more; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 146 | }; |
| 147 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 148 | struct kvm_shadow_walk_iterator { |
| 149 | u64 addr; |
| 150 | hpa_t shadow_addr; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 151 | u64 *sptep; |
Xiao Guangrong | dd3bfd5 | 2011-07-12 03:32:54 +0800 | [diff] [blame] | 152 | int level; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 153 | unsigned index; |
| 154 | }; |
| 155 | |
| 156 | #define for_each_shadow_entry(_vcpu, _addr, _walker) \ |
| 157 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 158 | shadow_walk_okay(&(_walker)); \ |
| 159 | shadow_walk_next(&(_walker))) |
| 160 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 161 | #define for_each_shadow_entry_lockless(_vcpu, _addr, _walker, spte) \ |
| 162 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 163 | shadow_walk_okay(&(_walker)) && \ |
| 164 | ({ spte = mmu_spte_get_lockless(_walker.sptep); 1; }); \ |
| 165 | __shadow_walk_next(&(_walker), spte)) |
| 166 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 167 | static struct kmem_cache *pte_list_desc_cache; |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 168 | static struct kmem_cache *mmu_page_header_cache; |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 169 | static struct percpu_counter kvm_total_used_mmu_pages; |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 170 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 171 | static u64 __read_mostly shadow_nx_mask; |
| 172 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ |
| 173 | static u64 __read_mostly shadow_user_mask; |
| 174 | static u64 __read_mostly shadow_accessed_mask; |
| 175 | static u64 __read_mostly shadow_dirty_mask; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 176 | static u64 __read_mostly shadow_mmio_mask; |
| 177 | |
| 178 | static void mmu_spte_set(u64 *sptep, u64 spte); |
Avi Kivity | e676505 | 2012-07-08 17:16:30 +0300 | [diff] [blame] | 179 | static void mmu_free_roots(struct kvm_vcpu *vcpu); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 180 | |
| 181 | void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask) |
| 182 | { |
| 183 | shadow_mmio_mask = mmio_mask; |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask); |
| 186 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 187 | /* |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 188 | * the low bit of the generation number is always presumed to be zero. |
| 189 | * This disables mmio caching during memslot updates. The concept is |
| 190 | * similar to a seqcount but instead of retrying the access we just punt |
| 191 | * and ignore the cache. |
| 192 | * |
| 193 | * spte bits 3-11 are used as bits 1-9 of the generation number, |
| 194 | * the bits 52-61 are used as bits 10-19 of the generation number. |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 195 | */ |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 196 | #define MMIO_SPTE_GEN_LOW_SHIFT 2 |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 197 | #define MMIO_SPTE_GEN_HIGH_SHIFT 52 |
| 198 | |
David Matlack | ee3d157 | 2014-08-18 15:46:06 -0700 | [diff] [blame] | 199 | #define MMIO_GEN_SHIFT 20 |
| 200 | #define MMIO_GEN_LOW_SHIFT 10 |
| 201 | #define MMIO_GEN_LOW_MASK ((1 << MMIO_GEN_LOW_SHIFT) - 2) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 202 | #define MMIO_GEN_MASK ((1 << MMIO_GEN_SHIFT) - 1) |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 203 | |
| 204 | static u64 generation_mmio_spte_mask(unsigned int gen) |
| 205 | { |
| 206 | u64 mask; |
| 207 | |
Tiejun Chen | 842bb26 | 2014-11-18 17:14:38 +0800 | [diff] [blame] | 208 | WARN_ON(gen & ~MMIO_GEN_MASK); |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 209 | |
| 210 | mask = (gen & MMIO_GEN_LOW_MASK) << MMIO_SPTE_GEN_LOW_SHIFT; |
| 211 | mask |= ((u64)gen >> MMIO_GEN_LOW_SHIFT) << MMIO_SPTE_GEN_HIGH_SHIFT; |
| 212 | return mask; |
| 213 | } |
| 214 | |
| 215 | static unsigned int get_mmio_spte_generation(u64 spte) |
| 216 | { |
| 217 | unsigned int gen; |
| 218 | |
| 219 | spte &= ~shadow_mmio_mask; |
| 220 | |
| 221 | gen = (spte >> MMIO_SPTE_GEN_LOW_SHIFT) & MMIO_GEN_LOW_MASK; |
| 222 | gen |= (spte >> MMIO_SPTE_GEN_HIGH_SHIFT) << MMIO_GEN_LOW_SHIFT; |
| 223 | return gen; |
| 224 | } |
| 225 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 226 | static unsigned int kvm_current_mmio_generation(struct kvm_vcpu *vcpu) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 227 | { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 228 | return kvm_vcpu_memslots(vcpu)->generation & MMIO_GEN_MASK; |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 229 | } |
| 230 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 231 | static void mark_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 gfn, |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 232 | unsigned access) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 233 | { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 234 | unsigned int gen = kvm_current_mmio_generation(vcpu); |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 235 | u64 mask = generation_mmio_spte_mask(gen); |
Takuya Yoshikawa | 95b0430 | 2013-03-12 17:44:40 +0900 | [diff] [blame] | 236 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 237 | access &= ACC_WRITE_MASK | ACC_USER_MASK; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 238 | mask |= shadow_mmio_mask | access | gfn << PAGE_SHIFT; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 239 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 240 | trace_mark_mmio_spte(sptep, gfn, access, gen); |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 241 | mmu_spte_set(sptep, mask); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | static bool is_mmio_spte(u64 spte) |
| 245 | { |
| 246 | return (spte & shadow_mmio_mask) == shadow_mmio_mask; |
| 247 | } |
| 248 | |
| 249 | static gfn_t get_mmio_spte_gfn(u64 spte) |
| 250 | { |
Tiejun Chen | 842bb26 | 2014-11-18 17:14:38 +0800 | [diff] [blame] | 251 | u64 mask = generation_mmio_spte_mask(MMIO_GEN_MASK) | shadow_mmio_mask; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 252 | return (spte & ~mask) >> PAGE_SHIFT; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | static unsigned get_mmio_spte_access(u64 spte) |
| 256 | { |
Tiejun Chen | 842bb26 | 2014-11-18 17:14:38 +0800 | [diff] [blame] | 257 | u64 mask = generation_mmio_spte_mask(MMIO_GEN_MASK) | shadow_mmio_mask; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 258 | return (spte & ~mask) & ~PAGE_MASK; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 259 | } |
| 260 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 261 | static bool set_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 262 | pfn_t pfn, unsigned access) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 263 | { |
| 264 | if (unlikely(is_noslot_pfn(pfn))) { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 265 | mark_mmio_spte(vcpu, sptep, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 266 | return true; |
| 267 | } |
| 268 | |
| 269 | return false; |
| 270 | } |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 271 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 272 | static bool check_mmio_spte(struct kvm_vcpu *vcpu, u64 spte) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 273 | { |
Xiao Guangrong | 089504c | 2013-06-07 16:51:27 +0800 | [diff] [blame] | 274 | unsigned int kvm_gen, spte_gen; |
| 275 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 276 | kvm_gen = kvm_current_mmio_generation(vcpu); |
Xiao Guangrong | 089504c | 2013-06-07 16:51:27 +0800 | [diff] [blame] | 277 | spte_gen = get_mmio_spte_generation(spte); |
| 278 | |
| 279 | trace_check_mmio_spte(spte, kvm_gen, spte_gen); |
| 280 | return likely(kvm_gen == spte_gen); |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 281 | } |
| 282 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 283 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 284 | u64 dirty_mask, u64 nx_mask, u64 x_mask) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 285 | { |
| 286 | shadow_user_mask = user_mask; |
| 287 | shadow_accessed_mask = accessed_mask; |
| 288 | shadow_dirty_mask = dirty_mask; |
| 289 | shadow_nx_mask = nx_mask; |
| 290 | shadow_x_mask = x_mask; |
| 291 | } |
| 292 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); |
| 293 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 294 | static int is_cpuid_PSE36(void) |
| 295 | { |
| 296 | return 1; |
| 297 | } |
| 298 | |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 299 | static int is_nx(struct kvm_vcpu *vcpu) |
| 300 | { |
Avi Kivity | f6801df | 2010-01-21 15:31:50 +0200 | [diff] [blame] | 301 | return vcpu->arch.efer & EFER_NX; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 302 | } |
| 303 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 304 | static int is_shadow_present_pte(u64 pte) |
| 305 | { |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 306 | return pte & PT_PRESENT_MASK && !is_mmio_spte(pte); |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 307 | } |
| 308 | |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 309 | static int is_large_pte(u64 pte) |
| 310 | { |
| 311 | return pte & PT_PAGE_SIZE_MASK; |
| 312 | } |
| 313 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 314 | static int is_rmap_spte(u64 pte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 315 | { |
Avi Kivity | 4b1a80f | 2008-03-23 12:18:19 +0200 | [diff] [blame] | 316 | return is_shadow_present_pte(pte); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 317 | } |
| 318 | |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 319 | static int is_last_spte(u64 pte, int level) |
| 320 | { |
| 321 | if (level == PT_PAGE_TABLE_LEVEL) |
| 322 | return 1; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 323 | if (is_large_pte(pte)) |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 324 | return 1; |
| 325 | return 0; |
| 326 | } |
| 327 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 328 | static pfn_t spte_to_pfn(u64 pte) |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 329 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 330 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 331 | } |
| 332 | |
Avi Kivity | da928521 | 2007-11-21 13:54:47 +0200 | [diff] [blame] | 333 | static gfn_t pse36_gfn_delta(u32 gpte) |
| 334 | { |
| 335 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; |
| 336 | |
| 337 | return (gpte & PT32_DIR_PSE36_MASK) << shift; |
| 338 | } |
| 339 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 340 | #ifdef CONFIG_X86_64 |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 341 | static void __set_spte(u64 *sptep, u64 spte) |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 342 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 343 | *sptep = spte; |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 344 | } |
| 345 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 346 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 347 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 348 | *sptep = spte; |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 349 | } |
| 350 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 351 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 352 | { |
| 353 | return xchg(sptep, spte); |
| 354 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 355 | |
| 356 | static u64 __get_spte_lockless(u64 *sptep) |
| 357 | { |
| 358 | return ACCESS_ONCE(*sptep); |
| 359 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 360 | #else |
| 361 | union split_spte { |
| 362 | struct { |
| 363 | u32 spte_low; |
| 364 | u32 spte_high; |
| 365 | }; |
| 366 | u64 spte; |
| 367 | }; |
| 368 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 369 | static void count_spte_clear(u64 *sptep, u64 spte) |
| 370 | { |
| 371 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 372 | |
| 373 | if (is_shadow_present_pte(spte)) |
| 374 | return; |
| 375 | |
| 376 | /* Ensure the spte is completely set before we increase the count */ |
| 377 | smp_wmb(); |
| 378 | sp->clear_spte_count++; |
| 379 | } |
| 380 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 381 | static void __set_spte(u64 *sptep, u64 spte) |
| 382 | { |
| 383 | union split_spte *ssptep, sspte; |
| 384 | |
| 385 | ssptep = (union split_spte *)sptep; |
| 386 | sspte = (union split_spte)spte; |
| 387 | |
| 388 | ssptep->spte_high = sspte.spte_high; |
| 389 | |
| 390 | /* |
| 391 | * If we map the spte from nonpresent to present, We should store |
| 392 | * the high bits firstly, then set present bit, so cpu can not |
| 393 | * fetch this spte while we are setting the spte. |
| 394 | */ |
| 395 | smp_wmb(); |
| 396 | |
| 397 | ssptep->spte_low = sspte.spte_low; |
| 398 | } |
| 399 | |
| 400 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
| 401 | { |
| 402 | union split_spte *ssptep, sspte; |
| 403 | |
| 404 | ssptep = (union split_spte *)sptep; |
| 405 | sspte = (union split_spte)spte; |
| 406 | |
| 407 | ssptep->spte_low = sspte.spte_low; |
| 408 | |
| 409 | /* |
| 410 | * If we map the spte from present to nonpresent, we should clear |
| 411 | * present bit firstly to avoid vcpu fetch the old high bits. |
| 412 | */ |
| 413 | smp_wmb(); |
| 414 | |
| 415 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 416 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 417 | } |
| 418 | |
| 419 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 420 | { |
| 421 | union split_spte *ssptep, sspte, orig; |
| 422 | |
| 423 | ssptep = (union split_spte *)sptep; |
| 424 | sspte = (union split_spte)spte; |
| 425 | |
| 426 | /* xchg acts as a barrier before the setting of the high bits */ |
| 427 | orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low); |
Zhao Jin | 41bc318 | 2011-09-19 12:19:51 +0800 | [diff] [blame] | 428 | orig.spte_high = ssptep->spte_high; |
| 429 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 430 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 431 | |
| 432 | return orig.spte; |
| 433 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 434 | |
| 435 | /* |
| 436 | * The idea using the light way get the spte on x86_32 guest is from |
| 437 | * gup_get_pte(arch/x86/mm/gup.c). |
Xiao Guangrong | accaefe | 2013-06-19 17:09:20 +0800 | [diff] [blame] | 438 | * |
| 439 | * An spte tlb flush may be pending, because kvm_set_pte_rmapp |
| 440 | * coalesces them and we are running out of the MMU lock. Therefore |
| 441 | * we need to protect against in-progress updates of the spte. |
| 442 | * |
| 443 | * Reading the spte while an update is in progress may get the old value |
| 444 | * for the high part of the spte. The race is fine for a present->non-present |
| 445 | * change (because the high part of the spte is ignored for non-present spte), |
| 446 | * but for a present->present change we must reread the spte. |
| 447 | * |
| 448 | * All such changes are done in two steps (present->non-present and |
| 449 | * non-present->present), hence it is enough to count the number of |
| 450 | * present->non-present updates: if it changed while reading the spte, |
| 451 | * we might have hit the race. This is done using clear_spte_count. |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 452 | */ |
| 453 | static u64 __get_spte_lockless(u64 *sptep) |
| 454 | { |
| 455 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 456 | union split_spte spte, *orig = (union split_spte *)sptep; |
| 457 | int count; |
| 458 | |
| 459 | retry: |
| 460 | count = sp->clear_spte_count; |
| 461 | smp_rmb(); |
| 462 | |
| 463 | spte.spte_low = orig->spte_low; |
| 464 | smp_rmb(); |
| 465 | |
| 466 | spte.spte_high = orig->spte_high; |
| 467 | smp_rmb(); |
| 468 | |
| 469 | if (unlikely(spte.spte_low != orig->spte_low || |
| 470 | count != sp->clear_spte_count)) |
| 471 | goto retry; |
| 472 | |
| 473 | return spte.spte; |
| 474 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 475 | #endif |
| 476 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 477 | static bool spte_is_locklessly_modifiable(u64 spte) |
| 478 | { |
Gleb Natapov | feb3eb7 | 2013-01-30 16:45:00 +0200 | [diff] [blame] | 479 | return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) == |
| 480 | (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 481 | } |
| 482 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 483 | static bool spte_has_volatile_bits(u64 spte) |
| 484 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 485 | /* |
| 486 | * Always atomicly update spte if it can be updated |
| 487 | * out of mmu-lock, it can ensure dirty bit is not lost, |
| 488 | * also, it can help us to get a stable is_writable_pte() |
| 489 | * to ensure tlb flush is not missed. |
| 490 | */ |
| 491 | if (spte_is_locklessly_modifiable(spte)) |
| 492 | return true; |
| 493 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 494 | if (!shadow_accessed_mask) |
| 495 | return false; |
| 496 | |
| 497 | if (!is_shadow_present_pte(spte)) |
| 498 | return false; |
| 499 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 500 | if ((spte & shadow_accessed_mask) && |
| 501 | (!is_writable_pte(spte) || (spte & shadow_dirty_mask))) |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 502 | return false; |
| 503 | |
| 504 | return true; |
| 505 | } |
| 506 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 507 | static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask) |
| 508 | { |
| 509 | return (old_spte & bit_mask) && !(new_spte & bit_mask); |
| 510 | } |
| 511 | |
Kai Huang | 7e71a59 | 2015-01-09 16:44:30 +0800 | [diff] [blame] | 512 | static bool spte_is_bit_changed(u64 old_spte, u64 new_spte, u64 bit_mask) |
| 513 | { |
| 514 | return (old_spte & bit_mask) != (new_spte & bit_mask); |
| 515 | } |
| 516 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 517 | /* Rules for using mmu_spte_set: |
| 518 | * Set the sptep from nonpresent to present. |
| 519 | * Note: the sptep being assigned *must* be either not present |
| 520 | * or in a state where the hardware will not attempt to update |
| 521 | * the spte. |
| 522 | */ |
| 523 | static void mmu_spte_set(u64 *sptep, u64 new_spte) |
| 524 | { |
| 525 | WARN_ON(is_shadow_present_pte(*sptep)); |
| 526 | __set_spte(sptep, new_spte); |
| 527 | } |
| 528 | |
| 529 | /* Rules for using mmu_spte_update: |
| 530 | * Update the state bits, it means the mapped pfn is not changged. |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 531 | * |
| 532 | * Whenever we overwrite a writable spte with a read-only one we |
| 533 | * should flush remote TLBs. Otherwise rmap_write_protect |
| 534 | * will find a read-only spte, even though the writable spte |
| 535 | * might be cached on a CPU's TLB, the return value indicates this |
| 536 | * case. |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 537 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 538 | static bool mmu_spte_update(u64 *sptep, u64 new_spte) |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 539 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 540 | u64 old_spte = *sptep; |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 541 | bool ret = false; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 542 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 543 | WARN_ON(!is_rmap_spte(new_spte)); |
| 544 | |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 545 | if (!is_shadow_present_pte(old_spte)) { |
| 546 | mmu_spte_set(sptep, new_spte); |
| 547 | return ret; |
| 548 | } |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 549 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 550 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 551 | __update_clear_spte_fast(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 552 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 553 | old_spte = __update_clear_spte_slow(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 554 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 555 | /* |
| 556 | * For the spte updated out of mmu-lock is safe, since |
| 557 | * we always atomicly update it, see the comments in |
| 558 | * spte_has_volatile_bits(). |
| 559 | */ |
Xiao Guangrong | 7f31c95 | 2014-04-17 17:06:15 +0800 | [diff] [blame] | 560 | if (spte_is_locklessly_modifiable(old_spte) && |
| 561 | !is_writable_pte(new_spte)) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 562 | ret = true; |
| 563 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 564 | if (!shadow_accessed_mask) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 565 | return ret; |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 566 | |
Kai Huang | 7e71a59 | 2015-01-09 16:44:30 +0800 | [diff] [blame] | 567 | /* |
| 568 | * Flush TLB when accessed/dirty bits are changed in the page tables, |
| 569 | * to guarantee consistency between TLB and page tables. |
| 570 | */ |
| 571 | if (spte_is_bit_changed(old_spte, new_spte, |
| 572 | shadow_accessed_mask | shadow_dirty_mask)) |
| 573 | ret = true; |
| 574 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 575 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask)) |
| 576 | kvm_set_pfn_accessed(spte_to_pfn(old_spte)); |
| 577 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask)) |
| 578 | kvm_set_pfn_dirty(spte_to_pfn(old_spte)); |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 579 | |
| 580 | return ret; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 581 | } |
| 582 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 583 | /* |
| 584 | * Rules for using mmu_spte_clear_track_bits: |
| 585 | * It sets the sptep from present to nonpresent, and track the |
| 586 | * state bits, it is used to clear the last level sptep. |
| 587 | */ |
| 588 | static int mmu_spte_clear_track_bits(u64 *sptep) |
| 589 | { |
| 590 | pfn_t pfn; |
| 591 | u64 old_spte = *sptep; |
| 592 | |
| 593 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 594 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 595 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 596 | old_spte = __update_clear_spte_slow(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 597 | |
| 598 | if (!is_rmap_spte(old_spte)) |
| 599 | return 0; |
| 600 | |
| 601 | pfn = spte_to_pfn(old_spte); |
Xiao Guangrong | 86fde74 | 2012-07-17 21:52:52 +0800 | [diff] [blame] | 602 | |
| 603 | /* |
| 604 | * KVM does not hold the refcount of the page used by |
| 605 | * kvm mmu, before reclaiming the page, we should |
| 606 | * unmap it from mmu first. |
| 607 | */ |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 608 | WARN_ON(!kvm_is_reserved_pfn(pfn) && !page_count(pfn_to_page(pfn))); |
Xiao Guangrong | 86fde74 | 2012-07-17 21:52:52 +0800 | [diff] [blame] | 609 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 610 | if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) |
| 611 | kvm_set_pfn_accessed(pfn); |
| 612 | if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) |
| 613 | kvm_set_pfn_dirty(pfn); |
| 614 | return 1; |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Rules for using mmu_spte_clear_no_track: |
| 619 | * Directly clear spte without caring the state bits of sptep, |
| 620 | * it is used to set the upper level spte. |
| 621 | */ |
| 622 | static void mmu_spte_clear_no_track(u64 *sptep) |
| 623 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 624 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 625 | } |
| 626 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 627 | static u64 mmu_spte_get_lockless(u64 *sptep) |
| 628 | { |
| 629 | return __get_spte_lockless(sptep); |
| 630 | } |
| 631 | |
| 632 | static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) |
| 633 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 634 | /* |
| 635 | * Prevent page table teardown by making any free-er wait during |
| 636 | * kvm_flush_remote_tlbs() IPI to all active vcpus. |
| 637 | */ |
| 638 | local_irq_disable(); |
| 639 | vcpu->mode = READING_SHADOW_PAGE_TABLES; |
| 640 | /* |
| 641 | * Make sure a following spte read is not reordered ahead of the write |
| 642 | * to vcpu->mode. |
| 643 | */ |
| 644 | smp_mb(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) |
| 648 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 649 | /* |
| 650 | * Make sure the write to vcpu->mode is not reordered in front of |
| 651 | * reads to sptes. If it does, kvm_commit_zap_page() can see us |
| 652 | * OUTSIDE_GUEST_MODE and proceed to free the shadow page table. |
| 653 | */ |
| 654 | smp_mb(); |
| 655 | vcpu->mode = OUTSIDE_GUEST_MODE; |
| 656 | local_irq_enable(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 657 | } |
| 658 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 659 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 660 | struct kmem_cache *base_cache, int min) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 661 | { |
| 662 | void *obj; |
| 663 | |
| 664 | if (cache->nobjs >= min) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 665 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 666 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 667 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 668 | if (!obj) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 669 | return -ENOMEM; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 670 | cache->objects[cache->nobjs++] = obj; |
| 671 | } |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 672 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 673 | } |
| 674 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 675 | static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *cache) |
| 676 | { |
| 677 | return cache->nobjs; |
| 678 | } |
| 679 | |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 680 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, |
| 681 | struct kmem_cache *cache) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 682 | { |
| 683 | while (mc->nobjs) |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 684 | kmem_cache_free(cache, mc->objects[--mc->nobjs]); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 685 | } |
| 686 | |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 687 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 688 | int min) |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 689 | { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 690 | void *page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 691 | |
| 692 | if (cache->nobjs >= min) |
| 693 | return 0; |
| 694 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 695 | page = (void *)__get_free_page(GFP_KERNEL); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 696 | if (!page) |
| 697 | return -ENOMEM; |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 698 | cache->objects[cache->nobjs++] = page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 699 | } |
| 700 | return 0; |
| 701 | } |
| 702 | |
| 703 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) |
| 704 | { |
| 705 | while (mc->nobjs) |
Avi Kivity | c4d198d | 2007-07-21 09:06:46 +0300 | [diff] [blame] | 706 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 707 | } |
| 708 | |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 709 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
| 710 | { |
| 711 | int r; |
| 712 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 713 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 714 | pte_list_desc_cache, 8 + PTE_PREFETCH_NUM); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 715 | if (r) |
| 716 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 717 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 718 | if (r) |
| 719 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 720 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 721 | mmu_page_header_cache, 4); |
| 722 | out: |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 723 | return r; |
| 724 | } |
| 725 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 726 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
| 727 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 728 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
| 729 | pte_list_desc_cache); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 730 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 731 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache, |
| 732 | mmu_page_header_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 733 | } |
| 734 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 735 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 736 | { |
| 737 | void *p; |
| 738 | |
| 739 | BUG_ON(!mc->nobjs); |
| 740 | p = mc->objects[--mc->nobjs]; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 741 | return p; |
| 742 | } |
| 743 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 744 | static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 745 | { |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 746 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 747 | } |
| 748 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 749 | static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 750 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 751 | kmem_cache_free(pte_list_desc_cache, pte_list_desc); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 752 | } |
| 753 | |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 754 | static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index) |
| 755 | { |
| 756 | if (!sp->role.direct) |
| 757 | return sp->gfns[index]; |
| 758 | |
| 759 | return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS)); |
| 760 | } |
| 761 | |
| 762 | static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) |
| 763 | { |
| 764 | if (sp->role.direct) |
| 765 | BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index)); |
| 766 | else |
| 767 | sp->gfns[index] = gfn; |
| 768 | } |
| 769 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 770 | /* |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 771 | * Return the pointer to the large page information for a given gfn, |
| 772 | * handling slots that are not large page aligned. |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 773 | */ |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 774 | static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, |
| 775 | struct kvm_memory_slot *slot, |
| 776 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 777 | { |
| 778 | unsigned long idx; |
| 779 | |
Takuya Yoshikawa | fb03cb6 | 2012-02-08 12:59:10 +0900 | [diff] [blame] | 780 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 781 | return &slot->arch.lpage_info[level - 2][idx]; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 782 | } |
| 783 | |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 784 | static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 785 | { |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 786 | struct kvm_memslots *slots; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 787 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 788 | struct kvm_lpage_info *linfo; |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 789 | gfn_t gfn; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 790 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 791 | |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 792 | gfn = sp->gfn; |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 793 | slots = kvm_memslots_for_spte_role(kvm, sp->role); |
| 794 | slot = __gfn_to_memslot(slots, gfn); |
Xiao Guangrong | 8a3d08f | 2015-05-13 14:42:21 +0800 | [diff] [blame] | 795 | for (i = PT_DIRECTORY_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 796 | linfo = lpage_info_slot(gfn, slot, i); |
| 797 | linfo->write_count += 1; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 798 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 799 | kvm->arch.indirect_shadow_pages++; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 800 | } |
| 801 | |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 802 | static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 803 | { |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 804 | struct kvm_memslots *slots; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 805 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 806 | struct kvm_lpage_info *linfo; |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 807 | gfn_t gfn; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 808 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 809 | |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 810 | gfn = sp->gfn; |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 811 | slots = kvm_memslots_for_spte_role(kvm, sp->role); |
| 812 | slot = __gfn_to_memslot(slots, gfn); |
Xiao Guangrong | 8a3d08f | 2015-05-13 14:42:21 +0800 | [diff] [blame] | 813 | for (i = PT_DIRECTORY_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 814 | linfo = lpage_info_slot(gfn, slot, i); |
| 815 | linfo->write_count -= 1; |
| 816 | WARN_ON(linfo->write_count < 0); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 817 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 818 | kvm->arch.indirect_shadow_pages--; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 819 | } |
| 820 | |
Takuya Yoshikawa | 5225fdf | 2015-10-16 17:08:03 +0900 | [diff] [blame^] | 821 | static int __has_wrprotected_page(gfn_t gfn, int level, |
| 822 | struct kvm_memory_slot *slot) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 823 | { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 824 | struct kvm_lpage_info *linfo; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 825 | |
| 826 | if (slot) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 827 | linfo = lpage_info_slot(gfn, slot, level); |
| 828 | return linfo->write_count; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | return 1; |
| 832 | } |
| 833 | |
Takuya Yoshikawa | 5225fdf | 2015-10-16 17:08:03 +0900 | [diff] [blame^] | 834 | static int has_wrprotected_page(struct kvm_vcpu *vcpu, gfn_t gfn, int level) |
| 835 | { |
| 836 | struct kvm_memory_slot *slot; |
| 837 | |
| 838 | slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
| 839 | return __has_wrprotected_page(gfn, level, slot); |
| 840 | } |
| 841 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 842 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 843 | { |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 844 | unsigned long page_size; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 845 | int i, ret = 0; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 846 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 847 | page_size = kvm_host_page_size(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 848 | |
Xiao Guangrong | 8a3d08f | 2015-05-13 14:42:21 +0800 | [diff] [blame] | 849 | for (i = PT_PAGE_TABLE_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 850 | if (page_size >= KVM_HPAGE_SIZE(i)) |
| 851 | ret = i; |
| 852 | else |
| 853 | break; |
| 854 | } |
| 855 | |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 856 | return ret; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 857 | } |
| 858 | |
Takuya Yoshikawa | d8aacf5 | 2015-10-16 17:07:01 +0900 | [diff] [blame] | 859 | static inline bool memslot_valid_for_gpte(struct kvm_memory_slot *slot, |
| 860 | bool no_dirty_log) |
| 861 | { |
| 862 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
| 863 | return false; |
| 864 | if (no_dirty_log && slot->dirty_bitmap) |
| 865 | return false; |
| 866 | |
| 867 | return true; |
| 868 | } |
| 869 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 870 | static struct kvm_memory_slot * |
| 871 | gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 872 | bool no_dirty_log) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 873 | { |
| 874 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 875 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 876 | slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
Takuya Yoshikawa | d8aacf5 | 2015-10-16 17:07:01 +0900 | [diff] [blame] | 877 | if (!memslot_valid_for_gpte(slot, no_dirty_log)) |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 878 | slot = NULL; |
| 879 | |
| 880 | return slot; |
| 881 | } |
| 882 | |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 883 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn, |
| 884 | bool *force_pt_level) |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 885 | { |
| 886 | int host_level, level, max_level; |
Takuya Yoshikawa | d8aacf5 | 2015-10-16 17:07:01 +0900 | [diff] [blame] | 887 | struct kvm_memory_slot *slot; |
| 888 | |
| 889 | slot = kvm_vcpu_gfn_to_memslot(vcpu, large_gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 890 | |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 891 | if (likely(!*force_pt_level)) |
Takuya Yoshikawa | d8aacf5 | 2015-10-16 17:07:01 +0900 | [diff] [blame] | 892 | *force_pt_level = !memslot_valid_for_gpte(slot, true); |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 893 | if (unlikely(*force_pt_level)) |
| 894 | return PT_PAGE_TABLE_LEVEL; |
| 895 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 896 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
| 897 | |
| 898 | if (host_level == PT_PAGE_TABLE_LEVEL) |
| 899 | return host_level; |
| 900 | |
Xiao Guangrong | 55dd98c | 2013-02-05 15:26:54 +0800 | [diff] [blame] | 901 | max_level = min(kvm_x86_ops->get_lpage_level(), host_level); |
Sheng Yang | 878403b | 2010-01-05 19:02:29 +0800 | [diff] [blame] | 902 | |
| 903 | for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) |
Takuya Yoshikawa | 5225fdf | 2015-10-16 17:08:03 +0900 | [diff] [blame^] | 904 | if (__has_wrprotected_page(large_gfn, level, slot)) |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 905 | break; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 906 | |
| 907 | return level - 1; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | /* |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 911 | * Pte mapping structures: |
| 912 | * |
| 913 | * If pte_list bit zero is zero, then pte_list point to the spte. |
| 914 | * |
| 915 | * If pte_list bit zero is one, (then pte_list & ~1) points to a struct |
| 916 | * pte_list_desc containing more mappings. |
| 917 | * |
| 918 | * Returns the number of pte entries before the spte was added or zero if |
| 919 | * the spte was not added. |
| 920 | * |
| 921 | */ |
| 922 | static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte, |
| 923 | unsigned long *pte_list) |
| 924 | { |
| 925 | struct pte_list_desc *desc; |
| 926 | int i, count = 0; |
| 927 | |
| 928 | if (!*pte_list) { |
| 929 | rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte); |
| 930 | *pte_list = (unsigned long)spte; |
| 931 | } else if (!(*pte_list & 1)) { |
| 932 | rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte); |
| 933 | desc = mmu_alloc_pte_list_desc(vcpu); |
| 934 | desc->sptes[0] = (u64 *)*pte_list; |
| 935 | desc->sptes[1] = spte; |
| 936 | *pte_list = (unsigned long)desc | 1; |
| 937 | ++count; |
| 938 | } else { |
| 939 | rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte); |
| 940 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 941 | while (desc->sptes[PTE_LIST_EXT-1] && desc->more) { |
| 942 | desc = desc->more; |
| 943 | count += PTE_LIST_EXT; |
| 944 | } |
| 945 | if (desc->sptes[PTE_LIST_EXT-1]) { |
| 946 | desc->more = mmu_alloc_pte_list_desc(vcpu); |
| 947 | desc = desc->more; |
| 948 | } |
| 949 | for (i = 0; desc->sptes[i]; ++i) |
| 950 | ++count; |
| 951 | desc->sptes[i] = spte; |
| 952 | } |
| 953 | return count; |
| 954 | } |
| 955 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 956 | static void |
| 957 | pte_list_desc_remove_entry(unsigned long *pte_list, struct pte_list_desc *desc, |
| 958 | int i, struct pte_list_desc *prev_desc) |
| 959 | { |
| 960 | int j; |
| 961 | |
| 962 | for (j = PTE_LIST_EXT - 1; !desc->sptes[j] && j > i; --j) |
| 963 | ; |
| 964 | desc->sptes[i] = desc->sptes[j]; |
| 965 | desc->sptes[j] = NULL; |
| 966 | if (j != 0) |
| 967 | return; |
| 968 | if (!prev_desc && !desc->more) |
| 969 | *pte_list = (unsigned long)desc->sptes[0]; |
| 970 | else |
| 971 | if (prev_desc) |
| 972 | prev_desc->more = desc->more; |
| 973 | else |
| 974 | *pte_list = (unsigned long)desc->more | 1; |
| 975 | mmu_free_pte_list_desc(desc); |
| 976 | } |
| 977 | |
| 978 | static void pte_list_remove(u64 *spte, unsigned long *pte_list) |
| 979 | { |
| 980 | struct pte_list_desc *desc; |
| 981 | struct pte_list_desc *prev_desc; |
| 982 | int i; |
| 983 | |
| 984 | if (!*pte_list) { |
| 985 | printk(KERN_ERR "pte_list_remove: %p 0->BUG\n", spte); |
| 986 | BUG(); |
| 987 | } else if (!(*pte_list & 1)) { |
| 988 | rmap_printk("pte_list_remove: %p 1->0\n", spte); |
| 989 | if ((u64 *)*pte_list != spte) { |
| 990 | printk(KERN_ERR "pte_list_remove: %p 1->BUG\n", spte); |
| 991 | BUG(); |
| 992 | } |
| 993 | *pte_list = 0; |
| 994 | } else { |
| 995 | rmap_printk("pte_list_remove: %p many->many\n", spte); |
| 996 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 997 | prev_desc = NULL; |
| 998 | while (desc) { |
| 999 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 1000 | if (desc->sptes[i] == spte) { |
| 1001 | pte_list_desc_remove_entry(pte_list, |
| 1002 | desc, i, |
| 1003 | prev_desc); |
| 1004 | return; |
| 1005 | } |
| 1006 | prev_desc = desc; |
| 1007 | desc = desc->more; |
| 1008 | } |
| 1009 | pr_err("pte_list_remove: %p many->many\n", spte); |
| 1010 | BUG(); |
| 1011 | } |
| 1012 | } |
| 1013 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1014 | typedef void (*pte_list_walk_fn) (u64 *spte); |
| 1015 | static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn) |
| 1016 | { |
| 1017 | struct pte_list_desc *desc; |
| 1018 | int i; |
| 1019 | |
| 1020 | if (!*pte_list) |
| 1021 | return; |
| 1022 | |
| 1023 | if (!(*pte_list & 1)) |
| 1024 | return fn((u64 *)*pte_list); |
| 1025 | |
| 1026 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 1027 | while (desc) { |
| 1028 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 1029 | fn(desc->sptes[i]); |
| 1030 | desc = desc->more; |
| 1031 | } |
| 1032 | } |
| 1033 | |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1034 | static unsigned long *__gfn_to_rmap(gfn_t gfn, int level, |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1035 | struct kvm_memory_slot *slot) |
| 1036 | { |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 1037 | unsigned long idx; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1038 | |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 1039 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | d89cc61 | 2012-08-01 18:03:28 +0900 | [diff] [blame] | 1040 | return &slot->arch.rmap[level - PT_PAGE_TABLE_LEVEL][idx]; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1041 | } |
| 1042 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1043 | /* |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1044 | * Take gfn and return the reverse mapping to it. |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1045 | */ |
Paolo Bonzini | e4cd1da | 2015-05-18 15:11:46 +0200 | [diff] [blame] | 1046 | static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, struct kvm_mmu_page *sp) |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1047 | { |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 1048 | struct kvm_memslots *slots; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1049 | struct kvm_memory_slot *slot; |
| 1050 | |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 1051 | slots = kvm_memslots_for_spte_role(kvm, sp->role); |
| 1052 | slot = __gfn_to_memslot(slots, gfn); |
Paolo Bonzini | e4cd1da | 2015-05-18 15:11:46 +0200 | [diff] [blame] | 1053 | return __gfn_to_rmap(gfn, sp->role.level, slot); |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1054 | } |
| 1055 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 1056 | static bool rmap_can_add(struct kvm_vcpu *vcpu) |
| 1057 | { |
| 1058 | struct kvm_mmu_memory_cache *cache; |
| 1059 | |
| 1060 | cache = &vcpu->arch.mmu_pte_list_desc_cache; |
| 1061 | return mmu_memory_cache_free_objects(cache); |
| 1062 | } |
| 1063 | |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1064 | static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1065 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1066 | struct kvm_mmu_page *sp; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1067 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1068 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1069 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1070 | kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn); |
Paolo Bonzini | e4cd1da | 2015-05-18 15:11:46 +0200 | [diff] [blame] | 1071 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1072 | return pte_list_add(vcpu, spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1073 | } |
| 1074 | |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1075 | static void rmap_remove(struct kvm *kvm, u64 *spte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1076 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1077 | struct kvm_mmu_page *sp; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1078 | gfn_t gfn; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1079 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1080 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1081 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1082 | gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt); |
Paolo Bonzini | e4cd1da | 2015-05-18 15:11:46 +0200 | [diff] [blame] | 1083 | rmapp = gfn_to_rmap(kvm, gfn, sp); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1084 | pte_list_remove(spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1085 | } |
| 1086 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1087 | /* |
| 1088 | * Used by the following functions to iterate through the sptes linked by a |
| 1089 | * rmap. All fields are private and not assumed to be used outside. |
| 1090 | */ |
| 1091 | struct rmap_iterator { |
| 1092 | /* private fields */ |
| 1093 | struct pte_list_desc *desc; /* holds the sptep if not NULL */ |
| 1094 | int pos; /* index of the sptep */ |
| 1095 | }; |
| 1096 | |
| 1097 | /* |
| 1098 | * Iteration must be started by this function. This should also be used after |
| 1099 | * removing/dropping sptes from the rmap link because in such cases the |
| 1100 | * information in the itererator may not be valid. |
| 1101 | * |
| 1102 | * Returns sptep if found, NULL otherwise. |
| 1103 | */ |
| 1104 | static u64 *rmap_get_first(unsigned long rmap, struct rmap_iterator *iter) |
| 1105 | { |
| 1106 | if (!rmap) |
| 1107 | return NULL; |
| 1108 | |
| 1109 | if (!(rmap & 1)) { |
| 1110 | iter->desc = NULL; |
| 1111 | return (u64 *)rmap; |
| 1112 | } |
| 1113 | |
| 1114 | iter->desc = (struct pte_list_desc *)(rmap & ~1ul); |
| 1115 | iter->pos = 0; |
| 1116 | return iter->desc->sptes[iter->pos]; |
| 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * Must be used with a valid iterator: e.g. after rmap_get_first(). |
| 1121 | * |
| 1122 | * Returns sptep if found, NULL otherwise. |
| 1123 | */ |
| 1124 | static u64 *rmap_get_next(struct rmap_iterator *iter) |
| 1125 | { |
| 1126 | if (iter->desc) { |
| 1127 | if (iter->pos < PTE_LIST_EXT - 1) { |
| 1128 | u64 *sptep; |
| 1129 | |
| 1130 | ++iter->pos; |
| 1131 | sptep = iter->desc->sptes[iter->pos]; |
| 1132 | if (sptep) |
| 1133 | return sptep; |
| 1134 | } |
| 1135 | |
| 1136 | iter->desc = iter->desc->more; |
| 1137 | |
| 1138 | if (iter->desc) { |
| 1139 | iter->pos = 0; |
| 1140 | /* desc->sptes[0] cannot be NULL */ |
| 1141 | return iter->desc->sptes[iter->pos]; |
| 1142 | } |
| 1143 | } |
| 1144 | |
| 1145 | return NULL; |
| 1146 | } |
| 1147 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1148 | #define for_each_rmap_spte(_rmap_, _iter_, _spte_) \ |
| 1149 | for (_spte_ = rmap_get_first(*_rmap_, _iter_); \ |
| 1150 | _spte_ && ({BUG_ON(!is_shadow_present_pte(*_spte_)); 1;}); \ |
| 1151 | _spte_ = rmap_get_next(_iter_)) |
| 1152 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1153 | static void drop_spte(struct kvm *kvm, u64 *sptep) |
Xiao Guangrong | e4b502e | 2010-07-16 11:28:09 +0800 | [diff] [blame] | 1154 | { |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1155 | if (mmu_spte_clear_track_bits(sptep)) |
Marcelo Tosatti | eb45fda | 2010-10-25 11:58:22 -0200 | [diff] [blame] | 1156 | rmap_remove(kvm, sptep); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 1157 | } |
| 1158 | |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1159 | |
| 1160 | static bool __drop_large_spte(struct kvm *kvm, u64 *sptep) |
| 1161 | { |
| 1162 | if (is_large_pte(*sptep)) { |
| 1163 | WARN_ON(page_header(__pa(sptep))->role.level == |
| 1164 | PT_PAGE_TABLE_LEVEL); |
| 1165 | drop_spte(kvm, sptep); |
| 1166 | --kvm->stat.lpages; |
| 1167 | return true; |
| 1168 | } |
| 1169 | |
| 1170 | return false; |
| 1171 | } |
| 1172 | |
| 1173 | static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) |
| 1174 | { |
| 1175 | if (__drop_large_spte(vcpu->kvm, sptep)) |
| 1176 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1177 | } |
| 1178 | |
| 1179 | /* |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1180 | * Write-protect on the specified @sptep, @pt_protect indicates whether |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1181 | * spte write-protection is caused by protecting shadow page table. |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1182 | * |
Tiejun Chen | b461966 | 2014-09-22 10:31:38 +0800 | [diff] [blame] | 1183 | * Note: write protection is difference between dirty logging and spte |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1184 | * protection: |
| 1185 | * - for dirty logging, the spte can be set to writable at anytime if |
| 1186 | * its dirty bitmap is properly set. |
| 1187 | * - for spte protection, the spte can be writable only after unsync-ing |
| 1188 | * shadow page. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1189 | * |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1190 | * Return true if tlb need be flushed. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1191 | */ |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1192 | static bool spte_write_protect(struct kvm *kvm, u64 *sptep, bool pt_protect) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1193 | { |
| 1194 | u64 spte = *sptep; |
| 1195 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1196 | if (!is_writable_pte(spte) && |
| 1197 | !(pt_protect && spte_is_locklessly_modifiable(spte))) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1198 | return false; |
| 1199 | |
| 1200 | rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep); |
| 1201 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1202 | if (pt_protect) |
| 1203 | spte &= ~SPTE_MMU_WRITEABLE; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1204 | spte = spte & ~PT_WRITABLE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1205 | |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1206 | return mmu_spte_update(sptep, spte); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1207 | } |
| 1208 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1209 | static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1210 | bool pt_protect) |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1211 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1212 | u64 *sptep; |
| 1213 | struct rmap_iterator iter; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1214 | bool flush = false; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1215 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1216 | for_each_rmap_spte(rmapp, &iter, sptep) |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1217 | flush |= spte_write_protect(kvm, sptep, pt_protect); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1218 | |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1219 | return flush; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1220 | } |
| 1221 | |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1222 | static bool spte_clear_dirty(struct kvm *kvm, u64 *sptep) |
| 1223 | { |
| 1224 | u64 spte = *sptep; |
| 1225 | |
| 1226 | rmap_printk("rmap_clear_dirty: spte %p %llx\n", sptep, *sptep); |
| 1227 | |
| 1228 | spte &= ~shadow_dirty_mask; |
| 1229 | |
| 1230 | return mmu_spte_update(sptep, spte); |
| 1231 | } |
| 1232 | |
| 1233 | static bool __rmap_clear_dirty(struct kvm *kvm, unsigned long *rmapp) |
| 1234 | { |
| 1235 | u64 *sptep; |
| 1236 | struct rmap_iterator iter; |
| 1237 | bool flush = false; |
| 1238 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1239 | for_each_rmap_spte(rmapp, &iter, sptep) |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1240 | flush |= spte_clear_dirty(kvm, sptep); |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1241 | |
| 1242 | return flush; |
| 1243 | } |
| 1244 | |
| 1245 | static bool spte_set_dirty(struct kvm *kvm, u64 *sptep) |
| 1246 | { |
| 1247 | u64 spte = *sptep; |
| 1248 | |
| 1249 | rmap_printk("rmap_set_dirty: spte %p %llx\n", sptep, *sptep); |
| 1250 | |
| 1251 | spte |= shadow_dirty_mask; |
| 1252 | |
| 1253 | return mmu_spte_update(sptep, spte); |
| 1254 | } |
| 1255 | |
| 1256 | static bool __rmap_set_dirty(struct kvm *kvm, unsigned long *rmapp) |
| 1257 | { |
| 1258 | u64 *sptep; |
| 1259 | struct rmap_iterator iter; |
| 1260 | bool flush = false; |
| 1261 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1262 | for_each_rmap_spte(rmapp, &iter, sptep) |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1263 | flush |= spte_set_dirty(kvm, sptep); |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1264 | |
| 1265 | return flush; |
| 1266 | } |
| 1267 | |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1268 | /** |
Kai Huang | 3b0f1d0 | 2015-01-28 10:54:23 +0800 | [diff] [blame] | 1269 | * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1270 | * @kvm: kvm instance |
| 1271 | * @slot: slot to protect |
| 1272 | * @gfn_offset: start of the BITS_PER_LONG pages we care about |
| 1273 | * @mask: indicates which pages we should protect |
| 1274 | * |
| 1275 | * Used when we do not need to care about huge page mappings: e.g. during dirty |
| 1276 | * logging we do not have any such mappings. |
| 1277 | */ |
Kai Huang | 3b0f1d0 | 2015-01-28 10:54:23 +0800 | [diff] [blame] | 1278 | static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1279 | struct kvm_memory_slot *slot, |
| 1280 | gfn_t gfn_offset, unsigned long mask) |
Izik Eidus | 98348e9 | 2007-10-16 14:42:30 +0200 | [diff] [blame] | 1281 | { |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1282 | unsigned long *rmapp; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1283 | |
| 1284 | while (mask) { |
Takuya Yoshikawa | 65fbe37 | 2012-08-01 18:02:01 +0900 | [diff] [blame] | 1285 | rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), |
| 1286 | PT_PAGE_TABLE_LEVEL, slot); |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1287 | __rmap_write_protect(kvm, rmapp, false); |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1288 | |
| 1289 | /* clear the first set bit */ |
| 1290 | mask &= mask - 1; |
| 1291 | } |
| 1292 | } |
| 1293 | |
Kai Huang | 3b0f1d0 | 2015-01-28 10:54:23 +0800 | [diff] [blame] | 1294 | /** |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 1295 | * kvm_mmu_clear_dirty_pt_masked - clear MMU D-bit for PT level pages |
| 1296 | * @kvm: kvm instance |
| 1297 | * @slot: slot to clear D-bit |
| 1298 | * @gfn_offset: start of the BITS_PER_LONG pages we care about |
| 1299 | * @mask: indicates which pages we should clear D-bit |
| 1300 | * |
| 1301 | * Used for PML to re-log the dirty GPAs after userspace querying dirty_bitmap. |
| 1302 | */ |
| 1303 | void kvm_mmu_clear_dirty_pt_masked(struct kvm *kvm, |
| 1304 | struct kvm_memory_slot *slot, |
| 1305 | gfn_t gfn_offset, unsigned long mask) |
| 1306 | { |
| 1307 | unsigned long *rmapp; |
| 1308 | |
| 1309 | while (mask) { |
| 1310 | rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), |
| 1311 | PT_PAGE_TABLE_LEVEL, slot); |
| 1312 | __rmap_clear_dirty(kvm, rmapp); |
| 1313 | |
| 1314 | /* clear the first set bit */ |
| 1315 | mask &= mask - 1; |
| 1316 | } |
| 1317 | } |
| 1318 | EXPORT_SYMBOL_GPL(kvm_mmu_clear_dirty_pt_masked); |
| 1319 | |
| 1320 | /** |
Kai Huang | 3b0f1d0 | 2015-01-28 10:54:23 +0800 | [diff] [blame] | 1321 | * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected |
| 1322 | * PT level pages. |
| 1323 | * |
| 1324 | * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to |
| 1325 | * enable dirty logging for them. |
| 1326 | * |
| 1327 | * Used when we do not need to care about huge page mappings: e.g. during dirty |
| 1328 | * logging we do not have any such mappings. |
| 1329 | */ |
| 1330 | void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm, |
| 1331 | struct kvm_memory_slot *slot, |
| 1332 | gfn_t gfn_offset, unsigned long mask) |
| 1333 | { |
Kai Huang | 88178fd | 2015-01-28 10:54:27 +0800 | [diff] [blame] | 1334 | if (kvm_x86_ops->enable_log_dirty_pt_masked) |
| 1335 | kvm_x86_ops->enable_log_dirty_pt_masked(kvm, slot, gfn_offset, |
| 1336 | mask); |
| 1337 | else |
| 1338 | kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask); |
Kai Huang | 3b0f1d0 | 2015-01-28 10:54:23 +0800 | [diff] [blame] | 1339 | } |
| 1340 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 1341 | static bool rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1342 | { |
| 1343 | struct kvm_memory_slot *slot; |
| 1344 | unsigned long *rmapp; |
| 1345 | int i; |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1346 | bool write_protected = false; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1347 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 1348 | slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1349 | |
Xiao Guangrong | 8a3d08f | 2015-05-13 14:42:21 +0800 | [diff] [blame] | 1350 | for (i = PT_PAGE_TABLE_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1351 | rmapp = __gfn_to_rmap(gfn, i, slot); |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 1352 | write_protected |= __rmap_write_protect(vcpu->kvm, rmapp, true); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 1353 | } |
| 1354 | |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1355 | return write_protected; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1356 | } |
| 1357 | |
Xiao Guangrong | 6a49f85 | 2015-05-13 14:42:25 +0800 | [diff] [blame] | 1358 | static bool kvm_zap_rmapp(struct kvm *kvm, unsigned long *rmapp) |
| 1359 | { |
| 1360 | u64 *sptep; |
| 1361 | struct rmap_iterator iter; |
| 1362 | bool flush = false; |
| 1363 | |
| 1364 | while ((sptep = rmap_get_first(*rmapp, &iter))) { |
| 1365 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
| 1366 | rmap_printk("%s: spte %p %llx.\n", __func__, sptep, *sptep); |
| 1367 | |
| 1368 | drop_spte(kvm, sptep); |
| 1369 | flush = true; |
| 1370 | } |
| 1371 | |
| 1372 | return flush; |
| 1373 | } |
| 1374 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1375 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1376 | struct kvm_memory_slot *slot, gfn_t gfn, int level, |
| 1377 | unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1378 | { |
Xiao Guangrong | 6a49f85 | 2015-05-13 14:42:25 +0800 | [diff] [blame] | 1379 | return kvm_zap_rmapp(kvm, rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1380 | } |
| 1381 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1382 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1383 | struct kvm_memory_slot *slot, gfn_t gfn, int level, |
| 1384 | unsigned long data) |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1385 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1386 | u64 *sptep; |
| 1387 | struct rmap_iterator iter; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1388 | int need_flush = 0; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1389 | u64 new_spte; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1390 | pte_t *ptep = (pte_t *)data; |
| 1391 | pfn_t new_pfn; |
| 1392 | |
| 1393 | WARN_ON(pte_huge(*ptep)); |
| 1394 | new_pfn = pte_pfn(*ptep); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1395 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1396 | restart: |
| 1397 | for_each_rmap_spte(rmapp, &iter, sptep) { |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1398 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx gfn %llx (%d)\n", |
| 1399 | sptep, *sptep, gfn, level); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1400 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1401 | need_flush = 1; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1402 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1403 | if (pte_write(*ptep)) { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1404 | drop_spte(kvm, sptep); |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1405 | goto restart; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1406 | } else { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1407 | new_spte = *sptep & ~PT64_BASE_ADDR_MASK; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1408 | new_spte |= (u64)new_pfn << PAGE_SHIFT; |
| 1409 | |
| 1410 | new_spte &= ~PT_WRITABLE_MASK; |
| 1411 | new_spte &= ~SPTE_HOST_WRITEABLE; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 1412 | new_spte &= ~shadow_accessed_mask; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1413 | |
| 1414 | mmu_spte_clear_track_bits(sptep); |
| 1415 | mmu_spte_set(sptep, new_spte); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1416 | } |
| 1417 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1418 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1419 | if (need_flush) |
| 1420 | kvm_flush_remote_tlbs(kvm); |
| 1421 | |
| 1422 | return 0; |
| 1423 | } |
| 1424 | |
Xiao Guangrong | 6ce1f4e | 2015-05-13 14:42:22 +0800 | [diff] [blame] | 1425 | struct slot_rmap_walk_iterator { |
| 1426 | /* input fields. */ |
| 1427 | struct kvm_memory_slot *slot; |
| 1428 | gfn_t start_gfn; |
| 1429 | gfn_t end_gfn; |
| 1430 | int start_level; |
| 1431 | int end_level; |
| 1432 | |
| 1433 | /* output fields. */ |
| 1434 | gfn_t gfn; |
| 1435 | unsigned long *rmap; |
| 1436 | int level; |
| 1437 | |
| 1438 | /* private field. */ |
| 1439 | unsigned long *end_rmap; |
| 1440 | }; |
| 1441 | |
| 1442 | static void |
| 1443 | rmap_walk_init_level(struct slot_rmap_walk_iterator *iterator, int level) |
| 1444 | { |
| 1445 | iterator->level = level; |
| 1446 | iterator->gfn = iterator->start_gfn; |
| 1447 | iterator->rmap = __gfn_to_rmap(iterator->gfn, level, iterator->slot); |
| 1448 | iterator->end_rmap = __gfn_to_rmap(iterator->end_gfn, level, |
| 1449 | iterator->slot); |
| 1450 | } |
| 1451 | |
| 1452 | static void |
| 1453 | slot_rmap_walk_init(struct slot_rmap_walk_iterator *iterator, |
| 1454 | struct kvm_memory_slot *slot, int start_level, |
| 1455 | int end_level, gfn_t start_gfn, gfn_t end_gfn) |
| 1456 | { |
| 1457 | iterator->slot = slot; |
| 1458 | iterator->start_level = start_level; |
| 1459 | iterator->end_level = end_level; |
| 1460 | iterator->start_gfn = start_gfn; |
| 1461 | iterator->end_gfn = end_gfn; |
| 1462 | |
| 1463 | rmap_walk_init_level(iterator, iterator->start_level); |
| 1464 | } |
| 1465 | |
| 1466 | static bool slot_rmap_walk_okay(struct slot_rmap_walk_iterator *iterator) |
| 1467 | { |
| 1468 | return !!iterator->rmap; |
| 1469 | } |
| 1470 | |
| 1471 | static void slot_rmap_walk_next(struct slot_rmap_walk_iterator *iterator) |
| 1472 | { |
| 1473 | if (++iterator->rmap <= iterator->end_rmap) { |
| 1474 | iterator->gfn += (1UL << KVM_HPAGE_GFN_SHIFT(iterator->level)); |
| 1475 | return; |
| 1476 | } |
| 1477 | |
| 1478 | if (++iterator->level > iterator->end_level) { |
| 1479 | iterator->rmap = NULL; |
| 1480 | return; |
| 1481 | } |
| 1482 | |
| 1483 | rmap_walk_init_level(iterator, iterator->level); |
| 1484 | } |
| 1485 | |
| 1486 | #define for_each_slot_rmap_range(_slot_, _start_level_, _end_level_, \ |
| 1487 | _start_gfn, _end_gfn, _iter_) \ |
| 1488 | for (slot_rmap_walk_init(_iter_, _slot_, _start_level_, \ |
| 1489 | _end_level_, _start_gfn, _end_gfn); \ |
| 1490 | slot_rmap_walk_okay(_iter_); \ |
| 1491 | slot_rmap_walk_next(_iter_)) |
| 1492 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1493 | static int kvm_handle_hva_range(struct kvm *kvm, |
| 1494 | unsigned long start, |
| 1495 | unsigned long end, |
| 1496 | unsigned long data, |
| 1497 | int (*handler)(struct kvm *kvm, |
| 1498 | unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1499 | struct kvm_memory_slot *slot, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1500 | gfn_t gfn, |
| 1501 | int level, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1502 | unsigned long data)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1503 | { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1504 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1505 | struct kvm_memory_slot *memslot; |
Xiao Guangrong | 6ce1f4e | 2015-05-13 14:42:22 +0800 | [diff] [blame] | 1506 | struct slot_rmap_walk_iterator iterator; |
| 1507 | int ret = 0; |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 1508 | int i; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1509 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 1510 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| 1511 | slots = __kvm_memslots(kvm, i); |
| 1512 | kvm_for_each_memslot(memslot, slots) { |
| 1513 | unsigned long hva_start, hva_end; |
| 1514 | gfn_t gfn_start, gfn_end; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1515 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 1516 | hva_start = max(start, memslot->userspace_addr); |
| 1517 | hva_end = min(end, memslot->userspace_addr + |
| 1518 | (memslot->npages << PAGE_SHIFT)); |
| 1519 | if (hva_start >= hva_end) |
| 1520 | continue; |
| 1521 | /* |
| 1522 | * {gfn(page) | page intersects with [hva_start, hva_end)} = |
| 1523 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. |
| 1524 | */ |
| 1525 | gfn_start = hva_to_gfn_memslot(hva_start, memslot); |
| 1526 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1527 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 1528 | for_each_slot_rmap_range(memslot, PT_PAGE_TABLE_LEVEL, |
| 1529 | PT_MAX_HUGEPAGE_LEVEL, |
| 1530 | gfn_start, gfn_end - 1, |
| 1531 | &iterator) |
| 1532 | ret |= handler(kvm, iterator.rmap, memslot, |
| 1533 | iterator.gfn, iterator.level, data); |
| 1534 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1535 | } |
| 1536 | |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1537 | return ret; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1538 | } |
| 1539 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1540 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
| 1541 | unsigned long data, |
| 1542 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1543 | struct kvm_memory_slot *slot, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1544 | gfn_t gfn, int level, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1545 | unsigned long data)) |
| 1546 | { |
| 1547 | return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1548 | } |
| 1549 | |
| 1550 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) |
| 1551 | { |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1552 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1553 | } |
| 1554 | |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 1555 | int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) |
| 1556 | { |
| 1557 | return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp); |
| 1558 | } |
| 1559 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1560 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) |
| 1561 | { |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1562 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1563 | } |
| 1564 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1565 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1566 | struct kvm_memory_slot *slot, gfn_t gfn, int level, |
| 1567 | unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1568 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1569 | u64 *sptep; |
Michael S. Tsirkin | 79f702a | 2012-06-03 11:34:08 +0300 | [diff] [blame] | 1570 | struct rmap_iterator uninitialized_var(iter); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1571 | int young = 0; |
| 1572 | |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 1573 | BUG_ON(!shadow_accessed_mask); |
Sheng Yang | 534e38b | 2008-09-08 15:12:30 +0800 | [diff] [blame] | 1574 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1575 | for_each_rmap_spte(rmapp, &iter, sptep) |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1576 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1577 | young = 1; |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1578 | clear_bit((ffs(shadow_accessed_mask) - 1), |
| 1579 | (unsigned long *)sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1580 | } |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1581 | |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1582 | trace_kvm_age_page(gfn, level, slot, young); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1583 | return young; |
| 1584 | } |
| 1585 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1586 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1587 | struct kvm_memory_slot *slot, gfn_t gfn, |
| 1588 | int level, unsigned long data) |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1589 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1590 | u64 *sptep; |
| 1591 | struct rmap_iterator iter; |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1592 | int young = 0; |
| 1593 | |
| 1594 | /* |
| 1595 | * If there's no access bit in the secondary pte set by the |
| 1596 | * hardware it's up to gup-fast/gup to set the access bit in |
| 1597 | * the primary pte or in the page structure. |
| 1598 | */ |
| 1599 | if (!shadow_accessed_mask) |
| 1600 | goto out; |
| 1601 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 1602 | for_each_rmap_spte(rmapp, &iter, sptep) |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1603 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1604 | young = 1; |
| 1605 | break; |
| 1606 | } |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1607 | out: |
| 1608 | return young; |
| 1609 | } |
| 1610 | |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1611 | #define RMAP_RECYCLE_THRESHOLD 1000 |
| 1612 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1613 | static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1614 | { |
| 1615 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1616 | struct kvm_mmu_page *sp; |
| 1617 | |
| 1618 | sp = page_header(__pa(spte)); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1619 | |
Paolo Bonzini | e4cd1da | 2015-05-18 15:11:46 +0200 | [diff] [blame] | 1620 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1621 | |
Andres Lagar-Cavilla | 8a9522d | 2014-09-23 12:34:54 -0700 | [diff] [blame] | 1622 | kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, gfn, sp->role.level, 0); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1623 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1624 | } |
| 1625 | |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 1626 | int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1627 | { |
Andres Lagar-Cavilla | 5712846 | 2014-09-22 14:54:42 -0700 | [diff] [blame] | 1628 | /* |
| 1629 | * In case of absence of EPT Access and Dirty Bits supports, |
| 1630 | * emulate the accessed bit for EPT, by checking if this page has |
| 1631 | * an EPT mapping, and clearing it if it does. On the next access, |
| 1632 | * a new EPT mapping will be established. |
| 1633 | * This has some overhead, but not as much as the cost of swapping |
| 1634 | * out actively used pages or breaking up actively used hugepages. |
| 1635 | */ |
| 1636 | if (!shadow_accessed_mask) { |
| 1637 | /* |
| 1638 | * We are holding the kvm->mmu_lock, and we are blowing up |
| 1639 | * shadow PTEs. MMU notifier consumers need to be kept at bay. |
| 1640 | * This is correct as long as we don't decouple the mmu_lock |
| 1641 | * protected regions (like invalidate_range_start|end does). |
| 1642 | */ |
| 1643 | kvm->mmu_notifier_seq++; |
| 1644 | return kvm_handle_hva_range(kvm, start, end, 0, |
| 1645 | kvm_unmap_rmapp); |
| 1646 | } |
| 1647 | |
| 1648 | return kvm_handle_hva_range(kvm, start, end, 0, kvm_age_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1649 | } |
| 1650 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1651 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) |
| 1652 | { |
| 1653 | return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); |
| 1654 | } |
| 1655 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1656 | #ifdef MMU_DEBUG |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1657 | static int is_empty_shadow_page(u64 *spt) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1658 | { |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1659 | u64 *pos; |
| 1660 | u64 *end; |
| 1661 | |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1662 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
Avi Kivity | 3c91551 | 2008-05-20 16:21:13 +0300 | [diff] [blame] | 1663 | if (is_shadow_present_pte(*pos)) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 1664 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1665 | pos, *pos); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1666 | return 0; |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1667 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1668 | return 1; |
| 1669 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1670 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1671 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1672 | /* |
| 1673 | * This value is the sum of all of the kvm instances's |
| 1674 | * kvm->arch.n_used_mmu_pages values. We need a global, |
| 1675 | * aggregate version in order to make the slab shrinker |
| 1676 | * faster |
| 1677 | */ |
| 1678 | static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) |
| 1679 | { |
| 1680 | kvm->arch.n_used_mmu_pages += nr; |
| 1681 | percpu_counter_add(&kvm_total_used_mmu_pages, nr); |
| 1682 | } |
| 1683 | |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1684 | static void kvm_mmu_free_page(struct kvm_mmu_page *sp) |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1685 | { |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 1686 | MMU_WARN_ON(!is_empty_shadow_page(sp->spt)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1687 | hlist_del(&sp->hash_link); |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 1688 | list_del(&sp->link); |
| 1689 | free_page((unsigned long)sp->spt); |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1690 | if (!sp->role.direct) |
| 1691 | free_page((unsigned long)sp->gfns); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 1692 | kmem_cache_free(mmu_page_header_cache, sp); |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1693 | } |
| 1694 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1695 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
| 1696 | { |
Dong, Eddie | 1ae0a13 | 2008-01-07 13:20:25 +0200 | [diff] [blame] | 1697 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1698 | } |
| 1699 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1700 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
| 1701 | struct kvm_mmu_page *sp, u64 *parent_pte) |
| 1702 | { |
| 1703 | if (!parent_pte) |
| 1704 | return; |
| 1705 | |
| 1706 | pte_list_add(vcpu, parent_pte, &sp->parent_ptes); |
| 1707 | } |
| 1708 | |
| 1709 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
| 1710 | u64 *parent_pte) |
| 1711 | { |
| 1712 | pte_list_remove(parent_pte, &sp->parent_ptes); |
| 1713 | } |
| 1714 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1715 | static void drop_parent_pte(struct kvm_mmu_page *sp, |
| 1716 | u64 *parent_pte) |
| 1717 | { |
| 1718 | mmu_page_remove_parent_pte(sp, parent_pte); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1719 | mmu_spte_clear_no_track(parent_pte); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1720 | } |
| 1721 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 1722 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1723 | u64 *parent_pte, int direct) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1724 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1725 | struct kvm_mmu_page *sp; |
Takuya Yoshikawa | 7ddca7e | 2013-03-21 19:33:43 +0900 | [diff] [blame] | 1726 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1727 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); |
| 1728 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1729 | if (!direct) |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1730 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1731 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 1732 | |
| 1733 | /* |
| 1734 | * The active_mmu_pages list is the FIFO list, do not move the |
| 1735 | * page until it is zapped. kvm_zap_obsolete_pages depends on |
| 1736 | * this feature. See the comments in kvm_zap_obsolete_pages(). |
| 1737 | */ |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 1738 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1739 | sp->parent_ptes = 0; |
| 1740 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1741 | kvm_mod_used_mmu_pages(vcpu->kvm, +1); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1742 | return sp; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1743 | } |
| 1744 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1745 | static void mark_unsync(u64 *spte); |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 1746 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1747 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1748 | pte_list_walk(&sp->parent_ptes, mark_unsync); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1749 | } |
| 1750 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1751 | static void mark_unsync(u64 *spte) |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1752 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1753 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1754 | unsigned int index; |
| 1755 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1756 | sp = page_header(__pa(spte)); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1757 | index = spte - sp->spt; |
| 1758 | if (__test_and_set_bit(index, sp->unsync_child_bitmap)) |
| 1759 | return; |
| 1760 | if (sp->unsync_children++) |
| 1761 | return; |
| 1762 | kvm_mmu_mark_parents_unsync(sp); |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1763 | } |
| 1764 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1765 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1766 | struct kvm_mmu_page *sp) |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1767 | { |
| 1768 | return 1; |
| 1769 | } |
| 1770 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 1771 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 1772 | { |
| 1773 | } |
| 1774 | |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1775 | static void nonpaging_update_pte(struct kvm_vcpu *vcpu, |
| 1776 | struct kvm_mmu_page *sp, u64 *spte, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 1777 | const void *pte) |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1778 | { |
| 1779 | WARN_ON(1); |
| 1780 | } |
| 1781 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1782 | #define KVM_PAGE_ARRAY_NR 16 |
| 1783 | |
| 1784 | struct kvm_mmu_pages { |
| 1785 | struct mmu_page_and_offset { |
| 1786 | struct kvm_mmu_page *sp; |
| 1787 | unsigned int idx; |
| 1788 | } page[KVM_PAGE_ARRAY_NR]; |
| 1789 | unsigned int nr; |
| 1790 | }; |
| 1791 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1792 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
| 1793 | int idx) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1794 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1795 | int i; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1796 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1797 | if (sp->unsync) |
| 1798 | for (i=0; i < pvec->nr; i++) |
| 1799 | if (pvec->page[i].sp == sp) |
| 1800 | return 0; |
| 1801 | |
| 1802 | pvec->page[pvec->nr].sp = sp; |
| 1803 | pvec->page[pvec->nr].idx = idx; |
| 1804 | pvec->nr++; |
| 1805 | return (pvec->nr == KVM_PAGE_ARRAY_NR); |
| 1806 | } |
| 1807 | |
| 1808 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1809 | struct kvm_mmu_pages *pvec) |
| 1810 | { |
| 1811 | int i, ret, nr_unsync_leaf = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1812 | |
Takuya Yoshikawa | 37178b8 | 2011-11-29 14:02:45 +0900 | [diff] [blame] | 1813 | for_each_set_bit(i, sp->unsync_child_bitmap, 512) { |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1814 | struct kvm_mmu_page *child; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1815 | u64 ent = sp->spt[i]; |
| 1816 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1817 | if (!is_shadow_present_pte(ent) || is_large_pte(ent)) |
| 1818 | goto clear_child_bitmap; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1819 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1820 | child = page_header(ent & PT64_BASE_ADDR_MASK); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1821 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1822 | if (child->unsync_children) { |
| 1823 | if (mmu_pages_add(pvec, child, i)) |
| 1824 | return -ENOSPC; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1825 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1826 | ret = __mmu_unsync_walk(child, pvec); |
| 1827 | if (!ret) |
| 1828 | goto clear_child_bitmap; |
| 1829 | else if (ret > 0) |
| 1830 | nr_unsync_leaf += ret; |
| 1831 | else |
| 1832 | return ret; |
| 1833 | } else if (child->unsync) { |
| 1834 | nr_unsync_leaf++; |
| 1835 | if (mmu_pages_add(pvec, child, i)) |
| 1836 | return -ENOSPC; |
| 1837 | } else |
| 1838 | goto clear_child_bitmap; |
| 1839 | |
| 1840 | continue; |
| 1841 | |
| 1842 | clear_child_bitmap: |
| 1843 | __clear_bit(i, sp->unsync_child_bitmap); |
| 1844 | sp->unsync_children--; |
| 1845 | WARN_ON((int)sp->unsync_children < 0); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1846 | } |
| 1847 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1848 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1849 | return nr_unsync_leaf; |
| 1850 | } |
| 1851 | |
| 1852 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1853 | struct kvm_mmu_pages *pvec) |
| 1854 | { |
| 1855 | if (!sp->unsync_children) |
| 1856 | return 0; |
| 1857 | |
| 1858 | mmu_pages_add(pvec, sp, 0); |
| 1859 | return __mmu_unsync_walk(sp, pvec); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1860 | } |
| 1861 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1862 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 1863 | { |
| 1864 | WARN_ON(!sp->unsync); |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 1865 | trace_kvm_mmu_sync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1866 | sp->unsync = 0; |
| 1867 | --kvm->stat.mmu_unsync; |
| 1868 | } |
| 1869 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1870 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 1871 | struct list_head *invalid_list); |
| 1872 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 1873 | struct list_head *invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1874 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 1875 | /* |
| 1876 | * NOTE: we should pay more attention on the zapped-obsolete page |
| 1877 | * (is_obsolete_sp(sp) && sp->role.invalid) when you do hash list walk |
| 1878 | * since it has been deleted from active_mmu_pages but still can be found |
| 1879 | * at hast list. |
| 1880 | * |
| 1881 | * for_each_gfn_indirect_valid_sp has skipped that kind of page and |
| 1882 | * kvm_mmu_get_page(), the only user of for_each_gfn_sp(), has skipped |
| 1883 | * all the obsolete pages. |
| 1884 | */ |
Takuya Yoshikawa | 1044b03 | 2013-03-06 16:05:07 +0900 | [diff] [blame] | 1885 | #define for_each_gfn_sp(_kvm, _sp, _gfn) \ |
| 1886 | hlist_for_each_entry(_sp, \ |
| 1887 | &(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \ |
| 1888 | if ((_sp)->gfn != (_gfn)) {} else |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1889 | |
Takuya Yoshikawa | 1044b03 | 2013-03-06 16:05:07 +0900 | [diff] [blame] | 1890 | #define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \ |
| 1891 | for_each_gfn_sp(_kvm, _sp, _gfn) \ |
| 1892 | if ((_sp)->role.direct || (_sp)->role.invalid) {} else |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1893 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1894 | /* @sp->gfn should be write-protected at the call site */ |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1895 | static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1896 | struct list_head *invalid_list, bool clear_unsync) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1897 | { |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1898 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1899 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1900 | return 1; |
| 1901 | } |
| 1902 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1903 | if (clear_unsync) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1904 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1905 | |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1906 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1907 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1908 | return 1; |
| 1909 | } |
| 1910 | |
Liang Chen | 77c3913 | 2014-09-18 12:38:37 -0400 | [diff] [blame] | 1911 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1912 | return 0; |
| 1913 | } |
| 1914 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1915 | static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, |
| 1916 | struct kvm_mmu_page *sp) |
| 1917 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1918 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1919 | int ret; |
| 1920 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1921 | ret = __kvm_sync_page(vcpu, sp, &invalid_list, false); |
Xiao Guangrong | be71e06 | 2010-06-11 21:31:38 +0800 | [diff] [blame] | 1922 | if (ret) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1923 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 1924 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1925 | return ret; |
| 1926 | } |
| 1927 | |
Xiao Guangrong | e37fa78 | 2011-11-30 17:43:24 +0800 | [diff] [blame] | 1928 | #ifdef CONFIG_KVM_MMU_AUDIT |
| 1929 | #include "mmu_audit.c" |
| 1930 | #else |
| 1931 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { } |
| 1932 | static void mmu_audit_disable(void) { } |
| 1933 | #endif |
| 1934 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1935 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 1936 | struct list_head *invalid_list) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1937 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1938 | return __kvm_sync_page(vcpu, sp, invalid_list, true); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1939 | } |
| 1940 | |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1941 | /* @gfn should be write-protected at the call site */ |
| 1942 | static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1943 | { |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1944 | struct kvm_mmu_page *s; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1945 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1946 | bool flush = false; |
| 1947 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1948 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1949 | if (!s->unsync) |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1950 | continue; |
| 1951 | |
| 1952 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1953 | kvm_unlink_unsync_page(vcpu->kvm, s); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1954 | if ((s->role.cr4_pae != !!is_pae(vcpu)) || |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1955 | (vcpu->arch.mmu.sync_page(vcpu, s))) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1956 | kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1957 | continue; |
| 1958 | } |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1959 | flush = true; |
| 1960 | } |
| 1961 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1962 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1963 | if (flush) |
Liang Chen | 77c3913 | 2014-09-18 12:38:37 -0400 | [diff] [blame] | 1964 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1965 | } |
| 1966 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1967 | struct mmu_page_path { |
| 1968 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; |
| 1969 | unsigned int idx[PT64_ROOT_LEVEL-1]; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1970 | }; |
| 1971 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1972 | #define for_each_sp(pvec, sp, parents, i) \ |
| 1973 | for (i = mmu_pages_next(&pvec, &parents, -1), \ |
| 1974 | sp = pvec.page[i].sp; \ |
| 1975 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ |
| 1976 | i = mmu_pages_next(&pvec, &parents, i)) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1977 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1978 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
| 1979 | struct mmu_page_path *parents, |
| 1980 | int i) |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1981 | { |
| 1982 | int n; |
| 1983 | |
| 1984 | for (n = i+1; n < pvec->nr; n++) { |
| 1985 | struct kvm_mmu_page *sp = pvec->page[n].sp; |
| 1986 | |
| 1987 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { |
| 1988 | parents->idx[0] = pvec->page[n].idx; |
| 1989 | return n; |
| 1990 | } |
| 1991 | |
| 1992 | parents->parent[sp->role.level-2] = sp; |
| 1993 | parents->idx[sp->role.level-1] = pvec->page[n].idx; |
| 1994 | } |
| 1995 | |
| 1996 | return n; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1997 | } |
| 1998 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1999 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2000 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2001 | struct kvm_mmu_page *sp; |
| 2002 | unsigned int level = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2003 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2004 | do { |
| 2005 | unsigned int idx = parents->idx[level]; |
| 2006 | |
| 2007 | sp = parents->parent[level]; |
| 2008 | if (!sp) |
| 2009 | return; |
| 2010 | |
| 2011 | --sp->unsync_children; |
| 2012 | WARN_ON((int)sp->unsync_children < 0); |
| 2013 | __clear_bit(idx, sp->unsync_child_bitmap); |
| 2014 | level++; |
| 2015 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); |
| 2016 | } |
| 2017 | |
| 2018 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
| 2019 | struct mmu_page_path *parents, |
| 2020 | struct kvm_mmu_pages *pvec) |
| 2021 | { |
| 2022 | parents->parent[parent->role.level-1] = NULL; |
| 2023 | pvec->nr = 0; |
| 2024 | } |
| 2025 | |
| 2026 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
| 2027 | struct kvm_mmu_page *parent) |
| 2028 | { |
| 2029 | int i; |
| 2030 | struct kvm_mmu_page *sp; |
| 2031 | struct mmu_page_path parents; |
| 2032 | struct kvm_mmu_pages pages; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2033 | LIST_HEAD(invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2034 | |
| 2035 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2036 | while (mmu_unsync_walk(parent, &pages)) { |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 2037 | bool protected = false; |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 2038 | |
| 2039 | for_each_sp(pages, sp, parents, i) |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2040 | protected |= rmap_write_protect(vcpu, sp->gfn); |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 2041 | |
| 2042 | if (protected) |
| 2043 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 2044 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2045 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2046 | kvm_sync_page(vcpu, sp, &invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2047 | mmu_pages_clear_parents(&parents); |
| 2048 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2049 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2050 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2051 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2052 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2053 | } |
| 2054 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2055 | static void init_shadow_page_table(struct kvm_mmu_page *sp) |
| 2056 | { |
| 2057 | int i; |
| 2058 | |
| 2059 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 2060 | sp->spt[i] = 0ull; |
| 2061 | } |
| 2062 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 2063 | static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |
| 2064 | { |
| 2065 | sp->write_flooding_count = 0; |
| 2066 | } |
| 2067 | |
| 2068 | static void clear_sp_write_flooding_count(u64 *spte) |
| 2069 | { |
| 2070 | struct kvm_mmu_page *sp = page_header(__pa(spte)); |
| 2071 | |
| 2072 | __clear_sp_write_flooding_count(sp); |
| 2073 | } |
| 2074 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2075 | static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 2076 | { |
| 2077 | return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen); |
| 2078 | } |
| 2079 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2080 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
| 2081 | gfn_t gfn, |
| 2082 | gva_t gaddr, |
| 2083 | unsigned level, |
Avi Kivity | f6e2c02b | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2084 | int direct, |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 2085 | unsigned access, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 2086 | u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2087 | { |
| 2088 | union kvm_mmu_page_role role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2089 | unsigned quadrant; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 2090 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 2091 | bool need_sync = false; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2092 | |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 2093 | role = vcpu->arch.mmu.base_role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2094 | role.level = level; |
Avi Kivity | f6e2c02b | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2095 | role.direct = direct; |
Avi Kivity | 84b0c8c | 2010-03-14 10:16:40 +0200 | [diff] [blame] | 2096 | if (role.direct) |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 2097 | role.cr4_pae = 0; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 2098 | role.access = access; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 2099 | if (!vcpu->arch.mmu.direct_map |
| 2100 | && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2101 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
| 2102 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; |
| 2103 | role.quadrant = quadrant; |
| 2104 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2105 | for_each_gfn_sp(vcpu->kvm, sp, gfn) { |
Xiao Guangrong | 7f52af7 | 2013-05-31 08:36:26 +0800 | [diff] [blame] | 2106 | if (is_obsolete_sp(vcpu->kvm, sp)) |
| 2107 | continue; |
| 2108 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2109 | if (!need_sync && sp->unsync) |
| 2110 | need_sync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2111 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2112 | if (sp->role.word != role.word) |
| 2113 | continue; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2114 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2115 | if (sp->unsync && kvm_sync_page_transient(vcpu, sp)) |
| 2116 | break; |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 2117 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2118 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
| 2119 | if (sp->unsync_children) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 2120 | kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2121 | kvm_mmu_mark_parents_unsync(sp); |
| 2122 | } else if (sp->unsync) |
| 2123 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 2124 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 2125 | __clear_sp_write_flooding_count(sp); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2126 | trace_kvm_mmu_get_page(sp, false); |
| 2127 | return sp; |
| 2128 | } |
Avi Kivity | dfc5aa0 | 2007-12-18 19:47:18 +0200 | [diff] [blame] | 2129 | ++vcpu->kvm->stat.mmu_cache_miss; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 2130 | sp = kvm_mmu_alloc_page(vcpu, parent_pte, direct); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2131 | if (!sp) |
| 2132 | return sp; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2133 | sp->gfn = gfn; |
| 2134 | sp->role = role; |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2135 | hlist_add_head(&sp->hash_link, |
| 2136 | &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]); |
Avi Kivity | f6e2c02b | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2137 | if (!direct) { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2138 | if (rmap_write_protect(vcpu, gfn)) |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 2139 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 2140 | if (level > PT_PAGE_TABLE_LEVEL && need_sync) |
| 2141 | kvm_sync_pages(vcpu, gfn); |
| 2142 | |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 2143 | account_shadowed(vcpu->kvm, sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2144 | } |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2145 | sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen; |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2146 | init_shadow_page_table(sp); |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 2147 | trace_kvm_mmu_get_page(sp, true); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2148 | return sp; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2149 | } |
| 2150 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2151 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
| 2152 | struct kvm_vcpu *vcpu, u64 addr) |
| 2153 | { |
| 2154 | iterator->addr = addr; |
| 2155 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; |
| 2156 | iterator->level = vcpu->arch.mmu.shadow_root_level; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2157 | |
| 2158 | if (iterator->level == PT64_ROOT_LEVEL && |
| 2159 | vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL && |
| 2160 | !vcpu->arch.mmu.direct_map) |
| 2161 | --iterator->level; |
| 2162 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2163 | if (iterator->level == PT32E_ROOT_LEVEL) { |
| 2164 | iterator->shadow_addr |
| 2165 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; |
| 2166 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; |
| 2167 | --iterator->level; |
| 2168 | if (!iterator->shadow_addr) |
| 2169 | iterator->level = 0; |
| 2170 | } |
| 2171 | } |
| 2172 | |
| 2173 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) |
| 2174 | { |
| 2175 | if (iterator->level < PT_PAGE_TABLE_LEVEL) |
| 2176 | return false; |
Marcelo Tosatti | 4d88954 | 2009-06-11 12:07:41 -0300 | [diff] [blame] | 2177 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2178 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
| 2179 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; |
| 2180 | return true; |
| 2181 | } |
| 2182 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2183 | static void __shadow_walk_next(struct kvm_shadow_walk_iterator *iterator, |
| 2184 | u64 spte) |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2185 | { |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2186 | if (is_last_spte(spte, iterator->level)) { |
Xiao Guangrong | 052331b | 2011-07-12 03:21:17 +0800 | [diff] [blame] | 2187 | iterator->level = 0; |
| 2188 | return; |
| 2189 | } |
| 2190 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2191 | iterator->shadow_addr = spte & PT64_BASE_ADDR_MASK; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2192 | --iterator->level; |
| 2193 | } |
| 2194 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2195 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) |
| 2196 | { |
| 2197 | return __shadow_walk_next(iterator, *iterator->sptep); |
| 2198 | } |
| 2199 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2200 | static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed) |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 2201 | { |
| 2202 | u64 spte; |
| 2203 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2204 | BUILD_BUG_ON(VMX_EPT_READABLE_MASK != PT_PRESENT_MASK || |
| 2205 | VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK); |
| 2206 | |
Xiao Guangrong | 24db273 | 2013-02-05 15:28:02 +0800 | [diff] [blame] | 2207 | spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2208 | shadow_user_mask | shadow_x_mask; |
| 2209 | |
| 2210 | if (accessed) |
| 2211 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 24db273 | 2013-02-05 15:28:02 +0800 | [diff] [blame] | 2212 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 2213 | mmu_spte_set(sptep, spte); |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 2214 | } |
| 2215 | |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 2216 | static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
| 2217 | unsigned direct_access) |
| 2218 | { |
| 2219 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { |
| 2220 | struct kvm_mmu_page *child; |
| 2221 | |
| 2222 | /* |
| 2223 | * For the direct sp, if the guest pte's dirty bit |
| 2224 | * changed form clean to dirty, it will corrupt the |
| 2225 | * sp's access: allow writable in the read-only sp, |
| 2226 | * so we should update the spte at this point to get |
| 2227 | * a new sp with the correct access. |
| 2228 | */ |
| 2229 | child = page_header(*sptep & PT64_BASE_ADDR_MASK); |
| 2230 | if (child->role.access == direct_access) |
| 2231 | return; |
| 2232 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2233 | drop_parent_pte(child, sptep); |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 2234 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 2235 | } |
| 2236 | } |
| 2237 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2238 | static bool mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp, |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2239 | u64 *spte) |
| 2240 | { |
| 2241 | u64 pte; |
| 2242 | struct kvm_mmu_page *child; |
| 2243 | |
| 2244 | pte = *spte; |
| 2245 | if (is_shadow_present_pte(pte)) { |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2246 | if (is_last_spte(pte, sp->role.level)) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2247 | drop_spte(kvm, spte); |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2248 | if (is_large_pte(pte)) |
| 2249 | --kvm->stat.lpages; |
| 2250 | } else { |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2251 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2252 | drop_parent_pte(child, spte); |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2253 | } |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2254 | return true; |
| 2255 | } |
| 2256 | |
| 2257 | if (is_mmio_spte(pte)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2258 | mmu_spte_clear_no_track(spte); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2259 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2260 | return false; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2261 | } |
| 2262 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 2263 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2264 | struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2265 | { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2266 | unsigned i; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2267 | |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2268 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 2269 | mmu_page_zap_pte(kvm, sp, sp->spt + i); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2270 | } |
| 2271 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2272 | static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2273 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2274 | mmu_page_remove_parent_pte(sp, parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2275 | } |
| 2276 | |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2277 | static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2278 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2279 | u64 *sptep; |
| 2280 | struct rmap_iterator iter; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2281 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2282 | while ((sptep = rmap_get_first(sp->parent_ptes, &iter))) |
| 2283 | drop_parent_pte(sp, sptep); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2284 | } |
| 2285 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2286 | static int mmu_zap_unsync_children(struct kvm *kvm, |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2287 | struct kvm_mmu_page *parent, |
| 2288 | struct list_head *invalid_list) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2289 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2290 | int i, zapped = 0; |
| 2291 | struct mmu_page_path parents; |
| 2292 | struct kvm_mmu_pages pages; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2293 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2294 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2295 | return 0; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2296 | |
| 2297 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2298 | while (mmu_unsync_walk(parent, &pages)) { |
| 2299 | struct kvm_mmu_page *sp; |
| 2300 | |
| 2301 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2302 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2303 | mmu_pages_clear_parents(&parents); |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2304 | zapped++; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2305 | } |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2306 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2307 | } |
| 2308 | |
| 2309 | return zapped; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2310 | } |
| 2311 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2312 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 2313 | struct list_head *invalid_list) |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2314 | { |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2315 | int ret; |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 2316 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2317 | trace_kvm_mmu_prepare_zap_page(sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2318 | ++kvm->stat.mmu_shadow_zapped; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2319 | ret = mmu_zap_unsync_children(kvm, sp, invalid_list); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2320 | kvm_mmu_page_unlink_children(kvm, sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2321 | kvm_mmu_unlink_parents(kvm, sp); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2322 | |
Avi Kivity | f6e2c02b | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2323 | if (!sp->role.invalid && !sp->role.direct) |
Paolo Bonzini | 3ed1a47 | 2015-05-19 16:29:22 +0200 | [diff] [blame] | 2324 | unaccount_shadowed(kvm, sp); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2325 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2326 | if (sp->unsync) |
| 2327 | kvm_unlink_unsync_page(kvm, sp); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2328 | if (!sp->root_count) { |
Gui Jianfeng | 54a4f02 | 2010-05-05 09:03:49 +0800 | [diff] [blame] | 2329 | /* Count self */ |
| 2330 | ret++; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2331 | list_move(&sp->link, invalid_list); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2332 | kvm_mod_used_mmu_pages(kvm, -1); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2333 | } else { |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2334 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
Gleb Natapov | 05988d7 | 2013-05-31 08:36:30 +0800 | [diff] [blame] | 2335 | |
| 2336 | /* |
| 2337 | * The obsolete pages can not be used on any vcpus. |
| 2338 | * See the comments in kvm_mmu_invalidate_zap_all_pages(). |
| 2339 | */ |
| 2340 | if (!sp->role.invalid && !is_obsolete_sp(kvm, sp)) |
| 2341 | kvm_reload_remote_mmus(kvm); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2342 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2343 | |
| 2344 | sp->role.invalid = 1; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2345 | return ret; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2346 | } |
| 2347 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2348 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 2349 | struct list_head *invalid_list) |
| 2350 | { |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2351 | struct kvm_mmu_page *sp, *nsp; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2352 | |
| 2353 | if (list_empty(invalid_list)) |
| 2354 | return; |
| 2355 | |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 2356 | /* |
| 2357 | * wmb: make sure everyone sees our modifications to the page tables |
| 2358 | * rmb: make sure we see changes to vcpu->mode |
| 2359 | */ |
| 2360 | smp_mb(); |
| 2361 | |
| 2362 | /* |
| 2363 | * Wait for all vcpus to exit guest mode and/or lockless shadow |
| 2364 | * page table walks. |
| 2365 | */ |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2366 | kvm_flush_remote_tlbs(kvm); |
| 2367 | |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2368 | list_for_each_entry_safe(sp, nsp, invalid_list, link) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2369 | WARN_ON(!sp->role.invalid || sp->root_count); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2370 | kvm_mmu_free_page(sp); |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2371 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2372 | } |
| 2373 | |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 2374 | static bool prepare_zap_oldest_mmu_page(struct kvm *kvm, |
| 2375 | struct list_head *invalid_list) |
| 2376 | { |
| 2377 | struct kvm_mmu_page *sp; |
| 2378 | |
| 2379 | if (list_empty(&kvm->arch.active_mmu_pages)) |
| 2380 | return false; |
| 2381 | |
| 2382 | sp = list_entry(kvm->arch.active_mmu_pages.prev, |
| 2383 | struct kvm_mmu_page, link); |
| 2384 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
| 2385 | |
| 2386 | return true; |
| 2387 | } |
| 2388 | |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2389 | /* |
| 2390 | * Changing the number of mmu pages allocated to the vm |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2391 | * Note: if goal_nr_mmu_pages is too small, you will get dead lock |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2392 | */ |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2393 | void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages) |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2394 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2395 | LIST_HEAD(invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2396 | |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2397 | spin_lock(&kvm->mmu_lock); |
| 2398 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2399 | if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 2400 | /* Need to free some mmu pages to achieve the goal. */ |
| 2401 | while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) |
| 2402 | if (!prepare_zap_oldest_mmu_page(kvm, &invalid_list)) |
| 2403 | break; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2404 | |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2405 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2406 | goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2407 | } |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2408 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2409 | kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages; |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2410 | |
| 2411 | spin_unlock(&kvm->mmu_lock); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2412 | } |
| 2413 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2414 | int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2415 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2416 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2417 | LIST_HEAD(invalid_list); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2418 | int r; |
| 2419 | |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2420 | pgprintk("%s: looking for gfn %llx\n", __func__, gfn); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2421 | r = 0; |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2422 | spin_lock(&kvm->mmu_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2423 | for_each_gfn_indirect_valid_sp(kvm, sp, gfn) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2424 | pgprintk("%s: gfn %llx role %x\n", __func__, gfn, |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2425 | sp->role.word); |
| 2426 | r = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2427 | kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2428 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2429 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2430 | spin_unlock(&kvm->mmu_lock); |
| 2431 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2432 | return r; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2433 | } |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2434 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2435 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2436 | static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2437 | { |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 2438 | trace_kvm_mmu_unsync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2439 | ++vcpu->kvm->stat.mmu_unsync; |
| 2440 | sp->unsync = 1; |
Marcelo Tosatti | 6cffe8c | 2008-12-01 22:32:04 -0200 | [diff] [blame] | 2441 | |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 2442 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2443 | } |
| 2444 | |
| 2445 | static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2446 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2447 | struct kvm_mmu_page *s; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2448 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2449 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2450 | if (s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2451 | continue; |
| 2452 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
| 2453 | __kvm_unsync_page(vcpu, s); |
| 2454 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2455 | } |
| 2456 | |
| 2457 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2458 | bool can_unsync) |
| 2459 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2460 | struct kvm_mmu_page *s; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2461 | bool need_unsync = false; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2462 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2463 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 36a2e67 | 2010-06-30 16:02:02 +0800 | [diff] [blame] | 2464 | if (!can_unsync) |
| 2465 | return 1; |
| 2466 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2467 | if (s->role.level != PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2468 | return 1; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2469 | |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 2470 | if (!s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2471 | need_unsync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2472 | } |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2473 | if (need_unsync) |
| 2474 | kvm_unsync_pages(vcpu, gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2475 | return 0; |
| 2476 | } |
| 2477 | |
Paolo Bonzini | d1fe921 | 2015-07-07 15:03:18 +0200 | [diff] [blame] | 2478 | static bool kvm_is_mmio_pfn(pfn_t pfn) |
| 2479 | { |
| 2480 | if (pfn_valid(pfn)) |
| 2481 | return !is_zero_pfn(pfn) && PageReserved(pfn_to_page(pfn)); |
| 2482 | |
| 2483 | return true; |
| 2484 | } |
| 2485 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2486 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2487 | unsigned pte_access, int level, |
Marcelo Tosatti | c2d0ee4 | 2009-04-05 14:54:47 -0300 | [diff] [blame] | 2488 | gfn_t gfn, pfn_t pfn, bool speculative, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2489 | bool can_unsync, bool host_writable) |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2490 | { |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2491 | u64 spte; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2492 | int ret = 0; |
Sheng Yang | 64d4d52 | 2008-10-09 16:01:57 +0800 | [diff] [blame] | 2493 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2494 | if (set_mmio_spte(vcpu, sptep, gfn, pfn, pte_access)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2495 | return 0; |
| 2496 | |
Marcelo Tosatti | 982c256 | 2010-10-22 14:18:16 -0200 | [diff] [blame] | 2497 | spte = PT_PRESENT_MASK; |
Avi Kivity | 947da53 | 2008-03-18 11:05:52 +0200 | [diff] [blame] | 2498 | if (!speculative) |
Avi Kivity | 3201b5d | 2008-08-27 20:01:04 +0300 | [diff] [blame] | 2499 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2500 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2501 | if (pte_access & ACC_EXEC_MASK) |
| 2502 | spte |= shadow_x_mask; |
| 2503 | else |
| 2504 | spte |= shadow_nx_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2505 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2506 | if (pte_access & ACC_USER_MASK) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2507 | spte |= shadow_user_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2508 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2509 | if (level > PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2510 | spte |= PT_PAGE_SIZE_MASK; |
Avi Kivity | b0bc3ee | 2010-09-13 16:45:28 +0200 | [diff] [blame] | 2511 | if (tdp_enabled) |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2512 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, |
Paolo Bonzini | d1fe921 | 2015-07-07 15:03:18 +0200 | [diff] [blame] | 2513 | kvm_is_mmio_pfn(pfn)); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2514 | |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2515 | if (host_writable) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2516 | spte |= SPTE_HOST_WRITEABLE; |
Xiao Guangrong | f8e453b | 2010-12-23 16:09:29 +0800 | [diff] [blame] | 2517 | else |
| 2518 | pte_access &= ~ACC_WRITE_MASK; |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2519 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2520 | spte |= (u64)pfn << PAGE_SHIFT; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2521 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2522 | if (pte_access & ACC_WRITE_MASK) { |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2523 | |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2524 | /* |
Xiao Guangrong | 7751bab | 2013-01-08 14:36:51 +0800 | [diff] [blame] | 2525 | * Other vcpu creates new sp in the window between |
| 2526 | * mapping_level() and acquiring mmu-lock. We can |
| 2527 | * allow guest to retry the access, the mapping can |
| 2528 | * be fixed if guest refault. |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2529 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2530 | if (level > PT_PAGE_TABLE_LEVEL && |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2531 | has_wrprotected_page(vcpu, gfn, level)) |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2532 | goto done; |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2533 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2534 | spte |= PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2535 | |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2536 | /* |
| 2537 | * Optimization: for pte sync, if spte was writable the hash |
| 2538 | * lookup is unnecessary (and expensive). Write protection |
| 2539 | * is responsibility of mmu_get_page / kvm_sync_page. |
| 2540 | * Same reasoning can be applied to dirty page accounting. |
| 2541 | */ |
Takuya Yoshikawa | 8dae444 | 2010-01-18 18:45:10 +0900 | [diff] [blame] | 2542 | if (!can_unsync && is_writable_pte(*sptep)) |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2543 | goto set_pte; |
| 2544 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2545 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2546 | pgprintk("%s: found shadow page for %llx, marking ro\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 2547 | __func__, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2548 | ret = 1; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2549 | pte_access &= ~ACC_WRITE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2550 | spte &= ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2551 | } |
| 2552 | } |
| 2553 | |
Kai Huang | 9b51a63 | 2015-01-28 10:54:25 +0800 | [diff] [blame] | 2554 | if (pte_access & ACC_WRITE_MASK) { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2555 | kvm_vcpu_mark_page_dirty(vcpu, gfn); |
Kai Huang | 9b51a63 | 2015-01-28 10:54:25 +0800 | [diff] [blame] | 2556 | spte |= shadow_dirty_mask; |
| 2557 | } |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2558 | |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2559 | set_pte: |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2560 | if (mmu_spte_update(sptep, spte)) |
Xiao Guangrong | b330aa0 | 2010-11-19 17:02:35 +0800 | [diff] [blame] | 2561 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2562 | done: |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2563 | return ret; |
| 2564 | } |
| 2565 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2566 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2567 | unsigned pte_access, int write_fault, int *emulate, |
| 2568 | int level, gfn_t gfn, pfn_t pfn, bool speculative, |
| 2569 | bool host_writable) |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2570 | { |
| 2571 | int was_rmapped = 0; |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 2572 | int rmap_count; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2573 | |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2574 | pgprintk("%s: spte %llx write_fault %d gfn %llx\n", __func__, |
| 2575 | *sptep, write_fault, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2576 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2577 | if (is_rmap_spte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2578 | /* |
| 2579 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink |
| 2580 | * the parent of the now unreachable PTE. |
| 2581 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2582 | if (level > PT_PAGE_TABLE_LEVEL && |
| 2583 | !is_large_pte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2584 | struct kvm_mmu_page *child; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2585 | u64 pte = *sptep; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2586 | |
| 2587 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2588 | drop_parent_pte(child, sptep); |
Marcelo Tosatti | 3be2264 | 2010-05-28 09:44:59 -0300 | [diff] [blame] | 2589 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2590 | } else if (pfn != spte_to_pfn(*sptep)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2591 | pgprintk("hfn old %llx new %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2592 | spte_to_pfn(*sptep), pfn); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2593 | drop_spte(vcpu->kvm, sptep); |
Xiao Guangrong | 9154635 | 2010-06-30 16:04:06 +0800 | [diff] [blame] | 2594 | kvm_flush_remote_tlbs(vcpu->kvm); |
Joerg Roedel | 6bed6b9 | 2009-02-18 14:08:59 +0100 | [diff] [blame] | 2595 | } else |
| 2596 | was_rmapped = 1; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2597 | } |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2598 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2599 | if (set_spte(vcpu, sptep, pte_access, level, gfn, pfn, speculative, |
| 2600 | true, host_writable)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2601 | if (write_fault) |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2602 | *emulate = 1; |
Liang Chen | 77c3913 | 2014-09-18 12:38:37 -0400 | [diff] [blame] | 2603 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Marcelo Tosatti | a378b4e | 2008-09-23 13:18:31 -0300 | [diff] [blame] | 2604 | } |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2605 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2606 | if (unlikely(is_mmio_spte(*sptep) && emulate)) |
| 2607 | *emulate = 1; |
| 2608 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2609 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2610 | pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2611 | is_large_pte(*sptep)? "2MB" : "4kB", |
Joerg Roedel | a205bc1 | 2009-07-09 16:36:01 +0200 | [diff] [blame] | 2612 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
| 2613 | *sptep, sptep); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2614 | if (!was_rmapped && is_large_pte(*sptep)) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2615 | ++vcpu->kvm->stat.lpages; |
| 2616 | |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2617 | if (is_shadow_present_pte(*sptep)) { |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2618 | if (!was_rmapped) { |
| 2619 | rmap_count = rmap_add(vcpu, sptep, gfn); |
| 2620 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) |
| 2621 | rmap_recycle(vcpu, sptep, gfn); |
| 2622 | } |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2623 | } |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 2624 | |
Xiao Guangrong | f3ac1a4 | 2012-10-16 20:07:03 +0800 | [diff] [blame] | 2625 | kvm_release_pfn_clean(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2626 | } |
| 2627 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2628 | static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2629 | bool no_dirty_log) |
| 2630 | { |
| 2631 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2632 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2633 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); |
Xiao Guangrong | 903816f | 2012-07-17 21:54:11 +0800 | [diff] [blame] | 2634 | if (!slot) |
Xiao Guangrong | 6c8ee57 | 2012-08-03 15:37:54 +0800 | [diff] [blame] | 2635 | return KVM_PFN_ERR_FAULT; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2636 | |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 2637 | return gfn_to_pfn_memslot_atomic(slot, gfn); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2638 | } |
| 2639 | |
| 2640 | static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, |
| 2641 | struct kvm_mmu_page *sp, |
| 2642 | u64 *start, u64 *end) |
| 2643 | { |
| 2644 | struct page *pages[PTE_PREFETCH_NUM]; |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 2645 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2646 | unsigned access = sp->role.access; |
| 2647 | int i, ret; |
| 2648 | gfn_t gfn; |
| 2649 | |
| 2650 | gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt); |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 2651 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, access & ACC_WRITE_MASK); |
| 2652 | if (!slot) |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2653 | return -1; |
| 2654 | |
Paolo Bonzini | d9ef13c | 2015-05-19 16:01:50 +0200 | [diff] [blame] | 2655 | ret = gfn_to_page_many_atomic(slot, gfn, pages, end - start); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2656 | if (ret <= 0) |
| 2657 | return -1; |
| 2658 | |
| 2659 | for (i = 0; i < ret; i++, gfn++, start++) |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2660 | mmu_set_spte(vcpu, start, access, 0, NULL, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2661 | sp->role.level, gfn, page_to_pfn(pages[i]), |
| 2662 | true, true); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2663 | |
| 2664 | return 0; |
| 2665 | } |
| 2666 | |
| 2667 | static void __direct_pte_prefetch(struct kvm_vcpu *vcpu, |
| 2668 | struct kvm_mmu_page *sp, u64 *sptep) |
| 2669 | { |
| 2670 | u64 *spte, *start = NULL; |
| 2671 | int i; |
| 2672 | |
| 2673 | WARN_ON(!sp->role.direct); |
| 2674 | |
| 2675 | i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1); |
| 2676 | spte = sp->spt + i; |
| 2677 | |
| 2678 | for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2679 | if (is_shadow_present_pte(*spte) || spte == sptep) { |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2680 | if (!start) |
| 2681 | continue; |
| 2682 | if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0) |
| 2683 | break; |
| 2684 | start = NULL; |
| 2685 | } else if (!start) |
| 2686 | start = spte; |
| 2687 | } |
| 2688 | } |
| 2689 | |
| 2690 | static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep) |
| 2691 | { |
| 2692 | struct kvm_mmu_page *sp; |
| 2693 | |
| 2694 | /* |
| 2695 | * Since it's no accessed bit on EPT, it's no way to |
| 2696 | * distinguish between actually accessed translations |
| 2697 | * and prefetched, so disable pte prefetch if EPT is |
| 2698 | * enabled. |
| 2699 | */ |
| 2700 | if (!shadow_accessed_mask) |
| 2701 | return; |
| 2702 | |
| 2703 | sp = page_header(__pa(sptep)); |
| 2704 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2705 | return; |
| 2706 | |
| 2707 | __direct_pte_prefetch(vcpu, sp, sptep); |
| 2708 | } |
| 2709 | |
Joerg Roedel | 4d9976b | 2008-02-07 13:47:42 +0100 | [diff] [blame] | 2710 | static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2711 | int map_writable, int level, gfn_t gfn, pfn_t pfn, |
| 2712 | bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2713 | { |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2714 | struct kvm_shadow_walk_iterator iterator; |
| 2715 | struct kvm_mmu_page *sp; |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2716 | int emulate = 0; |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2717 | gfn_t pseudo_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2718 | |
Marcelo Tosatti | 989c6b3 | 2013-12-19 15:28:51 -0200 | [diff] [blame] | 2719 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 2720 | return 0; |
| 2721 | |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2722 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2723 | if (iterator.level == level) { |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2724 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2725 | write, &emulate, level, gfn, pfn, |
| 2726 | prefault, map_writable); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2727 | direct_pte_prefetch(vcpu, iterator.sptep); |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2728 | ++vcpu->stat.pf_fixed; |
| 2729 | break; |
| 2730 | } |
| 2731 | |
Marcelo Tosatti | 404381c | 2014-02-24 13:59:32 -0300 | [diff] [blame] | 2732 | drop_large_spte(vcpu, iterator.sptep); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2733 | if (!is_shadow_present_pte(*iterator.sptep)) { |
Lai Jiangshan | c9fa0b3 | 2010-05-26 16:48:25 +0800 | [diff] [blame] | 2734 | u64 base_addr = iterator.addr; |
| 2735 | |
| 2736 | base_addr &= PT64_LVL_ADDR_MASK(iterator.level); |
| 2737 | pseudo_gfn = base_addr >> PAGE_SHIFT; |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2738 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, |
| 2739 | iterator.level - 1, |
| 2740 | 1, ACC_ALL, iterator.sptep); |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2741 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2742 | link_shadow_page(iterator.sptep, sp, true); |
Avi Kivity | 9f652d21 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2743 | } |
| 2744 | } |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2745 | return emulate; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2746 | } |
| 2747 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2748 | static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *tsk) |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2749 | { |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2750 | siginfo_t info; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2751 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2752 | info.si_signo = SIGBUS; |
| 2753 | info.si_errno = 0; |
| 2754 | info.si_code = BUS_MCEERR_AR; |
| 2755 | info.si_addr = (void __user *)address; |
| 2756 | info.si_addr_lsb = PAGE_SHIFT; |
| 2757 | |
| 2758 | send_sig_info(SIGBUS, &info, tsk); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2759 | } |
| 2760 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2761 | static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn) |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2762 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 2763 | /* |
| 2764 | * Do not cache the mmio info caused by writing the readonly gfn |
| 2765 | * into the spte otherwise read access on readonly gfn also can |
| 2766 | * caused mmio page fault and treat it as mmio access. |
| 2767 | * Return 1 to tell kvm to emulate it. |
| 2768 | */ |
| 2769 | if (pfn == KVM_PFN_ERR_RO_FAULT) |
| 2770 | return 1; |
| 2771 | |
Xiao Guangrong | e6c1502 | 2012-08-03 15:38:36 +0800 | [diff] [blame] | 2772 | if (pfn == KVM_PFN_ERR_HWPOISON) { |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2773 | kvm_send_hwpoison_signal(kvm_vcpu_gfn_to_hva(vcpu, gfn), current); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2774 | return 0; |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2775 | } |
Gleb Natapov | edba23e | 2010-07-07 20:16:45 +0300 | [diff] [blame] | 2776 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2777 | return -EFAULT; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2778 | } |
| 2779 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2780 | static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, |
| 2781 | gfn_t *gfnp, pfn_t *pfnp, int *levelp) |
| 2782 | { |
| 2783 | pfn_t pfn = *pfnp; |
| 2784 | gfn_t gfn = *gfnp; |
| 2785 | int level = *levelp; |
| 2786 | |
| 2787 | /* |
| 2788 | * Check if it's a transparent hugepage. If this would be an |
| 2789 | * hugetlbfs page, level wouldn't be set to |
| 2790 | * PT_PAGE_TABLE_LEVEL and there would be no adjustment done |
| 2791 | * here. |
| 2792 | */ |
Ard Biesheuvel | bf4bea8 | 2014-11-10 08:33:56 +0000 | [diff] [blame] | 2793 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn) && |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2794 | level == PT_PAGE_TABLE_LEVEL && |
| 2795 | PageTransCompound(pfn_to_page(pfn)) && |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2796 | !has_wrprotected_page(vcpu, gfn, PT_DIRECTORY_LEVEL)) { |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2797 | unsigned long mask; |
| 2798 | /* |
| 2799 | * mmu_notifier_retry was successful and we hold the |
| 2800 | * mmu_lock here, so the pmd can't become splitting |
| 2801 | * from under us, and in turn |
| 2802 | * __split_huge_page_refcount() can't run from under |
| 2803 | * us and we can safely transfer the refcount from |
| 2804 | * PG_tail to PG_head as we switch the pfn to tail to |
| 2805 | * head. |
| 2806 | */ |
| 2807 | *levelp = level = PT_DIRECTORY_LEVEL; |
| 2808 | mask = KVM_PAGES_PER_HPAGE(level) - 1; |
| 2809 | VM_BUG_ON((gfn & mask) != (pfn & mask)); |
| 2810 | if (pfn & mask) { |
| 2811 | gfn &= ~mask; |
| 2812 | *gfnp = gfn; |
| 2813 | kvm_release_pfn_clean(pfn); |
| 2814 | pfn &= ~mask; |
Xiao Guangrong | c358666 | 2012-05-28 14:10:43 +0800 | [diff] [blame] | 2815 | kvm_get_pfn(pfn); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2816 | *pfnp = pfn; |
| 2817 | } |
| 2818 | } |
| 2819 | } |
| 2820 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2821 | static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, |
| 2822 | pfn_t pfn, unsigned access, int *ret_val) |
| 2823 | { |
| 2824 | bool ret = true; |
| 2825 | |
| 2826 | /* The pfn is invalid, report the error! */ |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 2827 | if (unlikely(is_error_pfn(pfn))) { |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2828 | *ret_val = kvm_handle_bad_page(vcpu, gfn, pfn); |
| 2829 | goto exit; |
| 2830 | } |
| 2831 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2832 | if (unlikely(is_noslot_pfn(pfn))) |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2833 | vcpu_cache_mmio_info(vcpu, gva, gfn, access); |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2834 | |
| 2835 | ret = false; |
| 2836 | exit: |
| 2837 | return ret; |
| 2838 | } |
| 2839 | |
Xiao Guangrong | e5552fd | 2013-07-30 21:01:59 +0800 | [diff] [blame] | 2840 | static bool page_fault_can_be_fast(u32 error_code) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2841 | { |
| 2842 | /* |
Xiao Guangrong | 1c118b8 | 2013-07-18 12:52:37 +0800 | [diff] [blame] | 2843 | * Do not fix the mmio spte with invalid generation number which |
| 2844 | * need to be updated by slow page fault path. |
| 2845 | */ |
| 2846 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 2847 | return false; |
| 2848 | |
| 2849 | /* |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2850 | * #PF can be fast only if the shadow page table is present and it |
| 2851 | * is caused by write-protect, that means we just need change the |
| 2852 | * W bit of the spte which can be done out of mmu-lock. |
| 2853 | */ |
| 2854 | if (!(error_code & PFERR_PRESENT_MASK) || |
| 2855 | !(error_code & PFERR_WRITE_MASK)) |
| 2856 | return false; |
| 2857 | |
| 2858 | return true; |
| 2859 | } |
| 2860 | |
| 2861 | static bool |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2862 | fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 2863 | u64 *sptep, u64 spte) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2864 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2865 | gfn_t gfn; |
| 2866 | |
| 2867 | WARN_ON(!sp->role.direct); |
| 2868 | |
| 2869 | /* |
| 2870 | * The gfn of direct spte is stable since it is calculated |
| 2871 | * by sp->gfn. |
| 2872 | */ |
| 2873 | gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt); |
| 2874 | |
Kai Huang | 9b51a63 | 2015-01-28 10:54:25 +0800 | [diff] [blame] | 2875 | /* |
| 2876 | * Theoretically we could also set dirty bit (and flush TLB) here in |
| 2877 | * order to eliminate unnecessary PML logging. See comments in |
| 2878 | * set_spte. But fast_page_fault is very unlikely to happen with PML |
| 2879 | * enabled, so we do not do this. This might result in the same GPA |
| 2880 | * to be logged in PML buffer again when the write really happens, and |
| 2881 | * eventually to be called by mark_page_dirty twice. But it's also no |
| 2882 | * harm. This also avoids the TLB flush needed after setting dirty bit |
| 2883 | * so non-PML cases won't be impacted. |
| 2884 | * |
| 2885 | * Compare with set_spte where instead shadow_dirty_mask is set. |
| 2886 | */ |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2887 | if (cmpxchg64(sptep, spte, spte | PT_WRITABLE_MASK) == spte) |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 2888 | kvm_vcpu_mark_page_dirty(vcpu, gfn); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2889 | |
| 2890 | return true; |
| 2891 | } |
| 2892 | |
| 2893 | /* |
| 2894 | * Return value: |
| 2895 | * - true: let the vcpu to access on the same address again. |
| 2896 | * - false: let the real page fault path to fix it. |
| 2897 | */ |
| 2898 | static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level, |
| 2899 | u32 error_code) |
| 2900 | { |
| 2901 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2902 | struct kvm_mmu_page *sp; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2903 | bool ret = false; |
| 2904 | u64 spte = 0ull; |
| 2905 | |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 2906 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 2907 | return false; |
| 2908 | |
Xiao Guangrong | e5552fd | 2013-07-30 21:01:59 +0800 | [diff] [blame] | 2909 | if (!page_fault_can_be_fast(error_code)) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2910 | return false; |
| 2911 | |
| 2912 | walk_shadow_page_lockless_begin(vcpu); |
| 2913 | for_each_shadow_entry_lockless(vcpu, gva, iterator, spte) |
| 2914 | if (!is_shadow_present_pte(spte) || iterator.level < level) |
| 2915 | break; |
| 2916 | |
| 2917 | /* |
| 2918 | * If the mapping has been changed, let the vcpu fault on the |
| 2919 | * same address again. |
| 2920 | */ |
| 2921 | if (!is_rmap_spte(spte)) { |
| 2922 | ret = true; |
| 2923 | goto exit; |
| 2924 | } |
| 2925 | |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2926 | sp = page_header(__pa(iterator.sptep)); |
| 2927 | if (!is_last_spte(spte, sp->role.level)) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2928 | goto exit; |
| 2929 | |
| 2930 | /* |
| 2931 | * Check if it is a spurious fault caused by TLB lazily flushed. |
| 2932 | * |
| 2933 | * Need not check the access of upper level table entries since |
| 2934 | * they are always ACC_ALL. |
| 2935 | */ |
| 2936 | if (is_writable_pte(spte)) { |
| 2937 | ret = true; |
| 2938 | goto exit; |
| 2939 | } |
| 2940 | |
| 2941 | /* |
| 2942 | * Currently, to simplify the code, only the spte write-protected |
| 2943 | * by dirty-log can be fast fixed. |
| 2944 | */ |
| 2945 | if (!spte_is_locklessly_modifiable(spte)) |
| 2946 | goto exit; |
| 2947 | |
| 2948 | /* |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 2949 | * Do not fix write-permission on the large spte since we only dirty |
| 2950 | * the first page into the dirty-bitmap in fast_pf_fix_direct_spte() |
| 2951 | * that means other pages are missed if its slot is dirty-logged. |
| 2952 | * |
| 2953 | * Instead, we let the slow page fault path create a normal spte to |
| 2954 | * fix the access. |
| 2955 | * |
| 2956 | * See the comments in kvm_arch_commit_memory_region(). |
| 2957 | */ |
| 2958 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2959 | goto exit; |
| 2960 | |
| 2961 | /* |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2962 | * Currently, fast page fault only works for direct mapping since |
| 2963 | * the gfn is not stable for indirect shadow page. |
| 2964 | * See Documentation/virtual/kvm/locking.txt to get more detail. |
| 2965 | */ |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2966 | ret = fast_pf_fix_direct_spte(vcpu, sp, iterator.sptep, spte); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2967 | exit: |
Xiao Guangrong | a72faf2 | 2012-06-20 15:59:41 +0800 | [diff] [blame] | 2968 | trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep, |
| 2969 | spte, ret); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2970 | walk_shadow_page_lockless_end(vcpu); |
| 2971 | |
| 2972 | return ret; |
| 2973 | } |
| 2974 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2975 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2976 | gva_t gva, pfn_t *pfn, bool write, bool *writable); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 2977 | static void make_mmu_pages_available(struct kvm_vcpu *vcpu); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2978 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2979 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code, |
| 2980 | gfn_t gfn, bool prefault) |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2981 | { |
| 2982 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2983 | int level; |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 2984 | bool force_pt_level = false; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2985 | pfn_t pfn; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2986 | unsigned long mmu_seq; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2987 | bool map_writable, write = error_code & PFERR_WRITE_MASK; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2988 | |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 2989 | level = mapping_level(vcpu, gfn, &force_pt_level); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2990 | if (likely(!force_pt_level)) { |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2991 | /* |
| 2992 | * This path builds a PAE pagetable - so we can map |
| 2993 | * 2mb pages at maximum. Therefore check if the level |
| 2994 | * is larger than that. |
| 2995 | */ |
| 2996 | if (level > PT_DIRECTORY_LEVEL) |
| 2997 | level = PT_DIRECTORY_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2998 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2999 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 3000 | } |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 3001 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3002 | if (fast_page_fault(vcpu, v, level, error_code)) |
| 3003 | return 0; |
| 3004 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3005 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 3006 | smp_rmb(); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 3007 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3008 | if (try_async_pf(vcpu, prefault, gfn, v, &pfn, write, &map_writable)) |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 3009 | return 0; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3010 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 3011 | if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r)) |
| 3012 | return r; |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 3013 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3014 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 3015 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3016 | goto out_unlock; |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3017 | make_mmu_pages_available(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3018 | if (likely(!force_pt_level)) |
| 3019 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 3020 | r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn, |
| 3021 | prefault); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3022 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3023 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3024 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3025 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3026 | |
| 3027 | out_unlock: |
| 3028 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3029 | kvm_release_pfn_clean(pfn); |
| 3030 | return 0; |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3031 | } |
| 3032 | |
| 3033 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3034 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
| 3035 | { |
| 3036 | int i; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3037 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3038 | LIST_HEAD(invalid_list); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3039 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3040 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
Avi Kivity | 7b53aa5 | 2007-06-05 12:17:03 +0300 | [diff] [blame] | 3041 | return; |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 3042 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3043 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL && |
| 3044 | (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL || |
| 3045 | vcpu->arch.mmu.direct_map)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3046 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3047 | |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 3048 | spin_lock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3049 | sp = page_header(root); |
| 3050 | --sp->root_count; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3051 | if (!sp->root_count && sp->role.invalid) { |
| 3052 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
| 3053 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 3054 | } |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3055 | spin_unlock(&vcpu->kvm->mmu_lock); |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 3056 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3057 | return; |
| 3058 | } |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 3059 | |
| 3060 | spin_lock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3061 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3062 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3063 | |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3064 | if (root) { |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3065 | root &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3066 | sp = page_header(root); |
| 3067 | --sp->root_count; |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 3068 | if (!sp->root_count && sp->role.invalid) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3069 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
| 3070 | &invalid_list); |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3071 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3072 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3073 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3074 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3075 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3076 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3077 | } |
| 3078 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3079 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
| 3080 | { |
| 3081 | int ret = 0; |
| 3082 | |
| 3083 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 3084 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3085 | ret = 1; |
| 3086 | } |
| 3087 | |
| 3088 | return ret; |
| 3089 | } |
| 3090 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3091 | static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) |
| 3092 | { |
| 3093 | struct kvm_mmu_page *sp; |
Avi Kivity | 7ebaf15 | 2010-10-03 18:51:39 +0200 | [diff] [blame] | 3094 | unsigned i; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3095 | |
| 3096 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3097 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3098 | make_mmu_pages_available(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3099 | sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, |
| 3100 | 1, ACC_ALL, NULL); |
| 3101 | ++sp->root_count; |
| 3102 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3103 | vcpu->arch.mmu.root_hpa = __pa(sp->spt); |
| 3104 | } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) { |
| 3105 | for (i = 0; i < 4; ++i) { |
| 3106 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3107 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3108 | MMU_WARN_ON(VALID_PAGE(root)); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3109 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3110 | make_mmu_pages_available(vcpu); |
Avi Kivity | 649497d | 2010-12-28 12:09:07 +0200 | [diff] [blame] | 3111 | sp = kvm_mmu_get_page(vcpu, i << (30 - PAGE_SHIFT), |
| 3112 | i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3113 | PT32_ROOT_LEVEL, 1, ACC_ALL, |
| 3114 | NULL); |
| 3115 | root = __pa(sp->spt); |
| 3116 | ++sp->root_count; |
| 3117 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3118 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3119 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3120 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3121 | } else |
| 3122 | BUG(); |
| 3123 | |
| 3124 | return 0; |
| 3125 | } |
| 3126 | |
| 3127 | static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3128 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3129 | struct kvm_mmu_page *sp; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3130 | u64 pdptr, pm_mask; |
| 3131 | gfn_t root_gfn; |
| 3132 | int i; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 3133 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3134 | root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3135 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3136 | if (mmu_check_root(vcpu, root_gfn)) |
| 3137 | return 1; |
| 3138 | |
| 3139 | /* |
| 3140 | * Do we shadow a long mode page table? If so we need to |
| 3141 | * write-protect the guests page table root. |
| 3142 | */ |
| 3143 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3144 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3145 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3146 | MMU_WARN_ON(VALID_PAGE(root)); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3147 | |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3148 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3149 | make_mmu_pages_available(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3150 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, |
| 3151 | 0, ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3152 | root = __pa(sp->spt); |
| 3153 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3154 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3155 | vcpu->arch.mmu.root_hpa = root; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3156 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3157 | } |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3158 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3159 | /* |
| 3160 | * We shadow a 32 bit page table. This may be a legacy 2-level |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3161 | * or a PAE 3-level page table. In either case we need to be aware that |
| 3162 | * the shadow page table may be a PAE or a long mode page table. |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3163 | */ |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3164 | pm_mask = PT_PRESENT_MASK; |
| 3165 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) |
| 3166 | pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; |
| 3167 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3168 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3169 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3170 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3171 | MMU_WARN_ON(VALID_PAGE(root)); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3172 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3173 | pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 3174 | if (!is_present_gpte(pdptr)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3175 | vcpu->arch.mmu.pae_root[i] = 0; |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3176 | continue; |
| 3177 | } |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 3178 | root_gfn = pdptr >> PAGE_SHIFT; |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3179 | if (mmu_check_root(vcpu, root_gfn)) |
| 3180 | return 1; |
Eric Northup | 5a7388c | 2010-04-26 17:00:05 -0700 | [diff] [blame] | 3181 | } |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3182 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3183 | make_mmu_pages_available(vcpu); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3184 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3185 | PT32_ROOT_LEVEL, 0, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 3186 | ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3187 | root = __pa(sp->spt); |
| 3188 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3189 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3190 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3191 | vcpu->arch.mmu.pae_root[i] = root | pm_mask; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3192 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3193 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3194 | |
| 3195 | /* |
| 3196 | * If we shadow a 32 bit page table with a long mode page |
| 3197 | * table we enter this path. |
| 3198 | */ |
| 3199 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3200 | if (vcpu->arch.mmu.lm_root == NULL) { |
| 3201 | /* |
| 3202 | * The additional page necessary for this is only |
| 3203 | * allocated on demand. |
| 3204 | */ |
| 3205 | |
| 3206 | u64 *lm_root; |
| 3207 | |
| 3208 | lm_root = (void*)get_zeroed_page(GFP_KERNEL); |
| 3209 | if (lm_root == NULL) |
| 3210 | return 1; |
| 3211 | |
| 3212 | lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask; |
| 3213 | |
| 3214 | vcpu->arch.mmu.lm_root = lm_root; |
| 3215 | } |
| 3216 | |
| 3217 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root); |
| 3218 | } |
| 3219 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3220 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3221 | } |
| 3222 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3223 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) |
| 3224 | { |
| 3225 | if (vcpu->arch.mmu.direct_map) |
| 3226 | return mmu_alloc_direct_roots(vcpu); |
| 3227 | else |
| 3228 | return mmu_alloc_shadow_roots(vcpu); |
| 3229 | } |
| 3230 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3231 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3232 | { |
| 3233 | int i; |
| 3234 | struct kvm_mmu_page *sp; |
| 3235 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3236 | if (vcpu->arch.mmu.direct_map) |
| 3237 | return; |
| 3238 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3239 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3240 | return; |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 3241 | |
David Matlack | 56f17dd | 2014-08-18 15:46:07 -0700 | [diff] [blame] | 3242 | vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3243 | kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3244 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3245 | hpa_t root = vcpu->arch.mmu.root_hpa; |
| 3246 | sp = page_header(root); |
| 3247 | mmu_sync_children(vcpu, sp); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3248 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3249 | return; |
| 3250 | } |
| 3251 | for (i = 0; i < 4; ++i) { |
| 3252 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3253 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3254 | if (root && VALID_PAGE(root)) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3255 | root &= PT64_BASE_ADDR_MASK; |
| 3256 | sp = page_header(root); |
| 3257 | mmu_sync_children(vcpu, sp); |
| 3258 | } |
| 3259 | } |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3260 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3261 | } |
| 3262 | |
| 3263 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3264 | { |
| 3265 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3266 | mmu_sync_roots(vcpu); |
| 3267 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3268 | } |
Nadav Har'El | bfd0a56 | 2013-08-05 11:07:17 +0300 | [diff] [blame] | 3269 | EXPORT_SYMBOL_GPL(kvm_mmu_sync_roots); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3270 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 3271 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3272 | u32 access, struct x86_exception *exception) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3273 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3274 | if (exception) |
| 3275 | exception->error_code = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3276 | return vaddr; |
| 3277 | } |
| 3278 | |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3279 | static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr, |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3280 | u32 access, |
| 3281 | struct x86_exception *exception) |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3282 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3283 | if (exception) |
| 3284 | exception->error_code = 0; |
Paolo Bonzini | 54987b7 | 2014-09-02 13:23:06 +0200 | [diff] [blame] | 3285 | return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access, exception); |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3286 | } |
| 3287 | |
Xiao Guangrong | d625b15 | 2015-08-05 12:04:25 +0800 | [diff] [blame] | 3288 | static bool |
| 3289 | __is_rsvd_bits_set(struct rsvd_bits_validate *rsvd_check, u64 pte, int level) |
| 3290 | { |
| 3291 | int bit7 = (pte >> 7) & 1, low6 = pte & 0x3f; |
| 3292 | |
| 3293 | return (pte & rsvd_check->rsvd_bits_mask[bit7][level-1]) | |
| 3294 | ((rsvd_check->bad_mt_xwr & (1ull << low6)) != 0); |
| 3295 | } |
| 3296 | |
| 3297 | static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level) |
| 3298 | { |
| 3299 | return __is_rsvd_bits_set(&mmu->guest_rsvd_check, gpte, level); |
| 3300 | } |
| 3301 | |
| 3302 | static bool is_shadow_zero_bits_set(struct kvm_mmu *mmu, u64 spte, int level) |
| 3303 | { |
| 3304 | return __is_rsvd_bits_set(&mmu->shadow_zero_check, spte, level); |
| 3305 | } |
| 3306 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3307 | static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3308 | { |
| 3309 | if (direct) |
| 3310 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 3311 | |
| 3312 | return vcpu_match_mmio_gva(vcpu, addr); |
| 3313 | } |
| 3314 | |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3315 | /* return true if reserved bit is detected on spte. */ |
| 3316 | static bool |
| 3317 | walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3318 | { |
| 3319 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3320 | u64 sptes[PT64_ROOT_LEVEL], spte = 0ull; |
| 3321 | int root, leaf; |
| 3322 | bool reserved = false; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3323 | |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 3324 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3325 | goto exit; |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 3326 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3327 | walk_shadow_page_lockless_begin(vcpu); |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3328 | |
Paolo Bonzini | 29ecd66 | 2015-09-06 16:24:50 +0200 | [diff] [blame] | 3329 | for (shadow_walk_init(&iterator, vcpu, addr), |
| 3330 | leaf = root = iterator.level; |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3331 | shadow_walk_okay(&iterator); |
| 3332 | __shadow_walk_next(&iterator, spte)) { |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3333 | spte = mmu_spte_get_lockless(iterator.sptep); |
| 3334 | |
| 3335 | sptes[leaf - 1] = spte; |
Paolo Bonzini | 29ecd66 | 2015-09-06 16:24:50 +0200 | [diff] [blame] | 3336 | leaf--; |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3337 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3338 | if (!is_shadow_present_pte(spte)) |
| 3339 | break; |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3340 | |
| 3341 | reserved |= is_shadow_zero_bits_set(&vcpu->arch.mmu, spte, |
Paolo Bonzini | 58c9507 | 2015-09-22 10:15:59 +0200 | [diff] [blame] | 3342 | iterator.level); |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3343 | } |
| 3344 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3345 | walk_shadow_page_lockless_end(vcpu); |
| 3346 | |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3347 | if (reserved) { |
| 3348 | pr_err("%s: detect reserved bits on spte, addr 0x%llx, dump hierarchy:\n", |
| 3349 | __func__, addr); |
Paolo Bonzini | 29ecd66 | 2015-09-06 16:24:50 +0200 | [diff] [blame] | 3350 | while (root > leaf) { |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3351 | pr_err("------ spte 0x%llx level %d.\n", |
| 3352 | sptes[root - 1], root); |
| 3353 | root--; |
| 3354 | } |
| 3355 | } |
| 3356 | exit: |
| 3357 | *sptep = spte; |
| 3358 | return reserved; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3359 | } |
| 3360 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3361 | int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3362 | { |
| 3363 | u64 spte; |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3364 | bool reserved; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3365 | |
| 3366 | if (quickly_check_mmio_pf(vcpu, addr, direct)) |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3367 | return RET_MMIO_PF_EMULATE; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3368 | |
Xiao Guangrong | 47ab875 | 2015-08-05 12:04:26 +0800 | [diff] [blame] | 3369 | reserved = walk_shadow_page_get_mmio_spte(vcpu, addr, &spte); |
| 3370 | if (unlikely(reserved)) |
| 3371 | return RET_MMIO_PF_BUG; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3372 | |
| 3373 | if (is_mmio_spte(spte)) { |
| 3374 | gfn_t gfn = get_mmio_spte_gfn(spte); |
| 3375 | unsigned access = get_mmio_spte_access(spte); |
| 3376 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 3377 | if (!check_mmio_spte(vcpu, spte)) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3378 | return RET_MMIO_PF_INVALID; |
| 3379 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3380 | if (direct) |
| 3381 | addr = 0; |
Xiao Guangrong | 4f02264 | 2011-07-12 03:34:24 +0800 | [diff] [blame] | 3382 | |
| 3383 | trace_handle_mmio_page_fault(addr, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3384 | vcpu_cache_mmio_info(vcpu, addr, gfn, access); |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3385 | return RET_MMIO_PF_EMULATE; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3386 | } |
| 3387 | |
| 3388 | /* |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3389 | * If the page table is zapped by other cpus, let CPU fault again on |
| 3390 | * the address. |
| 3391 | */ |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3392 | return RET_MMIO_PF_RETRY; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3393 | } |
| 3394 | EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); |
| 3395 | |
| 3396 | static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, |
| 3397 | u32 error_code, bool direct) |
| 3398 | { |
| 3399 | int ret; |
| 3400 | |
| 3401 | ret = handle_mmio_page_fault_common(vcpu, addr, direct); |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3402 | WARN_ON(ret == RET_MMIO_PF_BUG); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3403 | return ret; |
| 3404 | } |
| 3405 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3406 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3407 | u32 error_code, bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3408 | { |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3409 | gfn_t gfn; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3410 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3411 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 3412 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3413 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3414 | if (unlikely(error_code & PFERR_RSVD_MASK)) { |
| 3415 | r = handle_mmio_page_fault(vcpu, gva, error_code, true); |
| 3416 | |
| 3417 | if (likely(r != RET_MMIO_PF_INVALID)) |
| 3418 | return r; |
| 3419 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3420 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3421 | r = mmu_topup_memory_caches(vcpu); |
| 3422 | if (r) |
| 3423 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3424 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3425 | MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3426 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3427 | gfn = gva >> PAGE_SHIFT; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3428 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3429 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3430 | error_code, gfn, prefault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3431 | } |
| 3432 | |
Jan Kiszka | 7e1fbea | 2010-10-20 15:18:02 +0200 | [diff] [blame] | 3433 | static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3434 | { |
| 3435 | struct kvm_arch_async_pf arch; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3436 | |
Gleb Natapov | 7c90705 | 2010-10-14 11:22:53 +0200 | [diff] [blame] | 3437 | arch.token = (vcpu->arch.apf.id++ << 12) | vcpu->vcpu_id; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3438 | arch.gfn = gfn; |
Xiao Guangrong | c4806ac | 2010-11-12 14:49:55 +0800 | [diff] [blame] | 3439 | arch.direct_map = vcpu->arch.mmu.direct_map; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3440 | arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3441 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 3442 | return kvm_setup_async_pf(vcpu, gva, kvm_vcpu_gfn_to_hva(vcpu, gfn), &arch); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3443 | } |
| 3444 | |
| 3445 | static bool can_do_async_pf(struct kvm_vcpu *vcpu) |
| 3446 | { |
Paolo Bonzini | 35754c9 | 2015-07-29 12:05:37 +0200 | [diff] [blame] | 3447 | if (unlikely(!lapic_in_kernel(vcpu) || |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3448 | kvm_event_needs_reinjection(vcpu))) |
| 3449 | return false; |
| 3450 | |
| 3451 | return kvm_x86_ops->interrupt_allowed(vcpu); |
| 3452 | } |
| 3453 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3454 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3455 | gva_t gva, pfn_t *pfn, bool write, bool *writable) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3456 | { |
Paolo Bonzini | 3520469 | 2015-04-02 11:20:48 +0200 | [diff] [blame] | 3457 | struct kvm_memory_slot *slot; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3458 | bool async; |
| 3459 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 3460 | slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); |
Paolo Bonzini | 3520469 | 2015-04-02 11:20:48 +0200 | [diff] [blame] | 3461 | async = false; |
| 3462 | *pfn = __gfn_to_pfn_memslot(slot, gfn, false, &async, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3463 | if (!async) |
| 3464 | return false; /* *pfn has correct page already */ |
| 3465 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3466 | if (!prefault && can_do_async_pf(vcpu)) { |
Xiao Guangrong | c9b263d | 2010-11-01 16:58:43 +0800 | [diff] [blame] | 3467 | trace_kvm_try_async_get_page(gva, gfn); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3468 | if (kvm_find_async_pf_gfn(vcpu, gfn)) { |
| 3469 | trace_kvm_async_pf_doublefault(gva, gfn); |
| 3470 | kvm_make_request(KVM_REQ_APF_HALT, vcpu); |
| 3471 | return true; |
| 3472 | } else if (kvm_arch_setup_async_pf(vcpu, gva, gfn)) |
| 3473 | return true; |
| 3474 | } |
| 3475 | |
Paolo Bonzini | 3520469 | 2015-04-02 11:20:48 +0200 | [diff] [blame] | 3476 | *pfn = __gfn_to_pfn_memslot(slot, gfn, false, NULL, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3477 | return false; |
| 3478 | } |
| 3479 | |
Xiao Guangrong | 6a39bbc | 2015-06-15 16:55:35 +0800 | [diff] [blame] | 3480 | static bool |
| 3481 | check_hugepage_cache_consistency(struct kvm_vcpu *vcpu, gfn_t gfn, int level) |
| 3482 | { |
| 3483 | int page_num = KVM_PAGES_PER_HPAGE(level); |
| 3484 | |
| 3485 | gfn &= ~(page_num - 1); |
| 3486 | |
| 3487 | return kvm_mtrr_check_gfn_range_consistency(vcpu, gfn, page_num); |
| 3488 | } |
| 3489 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 3490 | static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3491 | bool prefault) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3492 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 3493 | pfn_t pfn; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3494 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3495 | int level; |
Takuya Yoshikawa | cd1872f | 2015-10-16 17:04:13 +0900 | [diff] [blame] | 3496 | bool force_pt_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 3497 | gfn_t gfn = gpa >> PAGE_SHIFT; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3498 | unsigned long mmu_seq; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3499 | int write = error_code & PFERR_WRITE_MASK; |
| 3500 | bool map_writable; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3501 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3502 | MMU_WARN_ON(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3503 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3504 | if (unlikely(error_code & PFERR_RSVD_MASK)) { |
| 3505 | r = handle_mmio_page_fault(vcpu, gpa, error_code, true); |
| 3506 | |
| 3507 | if (likely(r != RET_MMIO_PF_INVALID)) |
| 3508 | return r; |
| 3509 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3510 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3511 | r = mmu_topup_memory_caches(vcpu); |
| 3512 | if (r) |
| 3513 | return r; |
| 3514 | |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 3515 | force_pt_level = !check_hugepage_cache_consistency(vcpu, gfn, |
| 3516 | PT_DIRECTORY_LEVEL); |
| 3517 | level = mapping_level(vcpu, gfn, &force_pt_level); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3518 | if (likely(!force_pt_level)) { |
Xiao Guangrong | 6a39bbc | 2015-06-15 16:55:35 +0800 | [diff] [blame] | 3519 | if (level > PT_DIRECTORY_LEVEL && |
| 3520 | !check_hugepage_cache_consistency(vcpu, gfn, level)) |
| 3521 | level = PT_DIRECTORY_LEVEL; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3522 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
Takuya Yoshikawa | fd13690 | 2015-10-16 17:06:02 +0900 | [diff] [blame] | 3523 | } |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3524 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3525 | if (fast_page_fault(vcpu, gpa, level, error_code)) |
| 3526 | return 0; |
| 3527 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3528 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 3529 | smp_rmb(); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3530 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3531 | if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable)) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3532 | return 0; |
| 3533 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 3534 | if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r)) |
| 3535 | return r; |
| 3536 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3537 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 3538 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3539 | goto out_unlock; |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3540 | make_mmu_pages_available(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3541 | if (likely(!force_pt_level)) |
| 3542 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3543 | r = __direct_map(vcpu, gpa, write, map_writable, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 3544 | level, gfn, pfn, prefault); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3545 | spin_unlock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3546 | |
| 3547 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3548 | |
| 3549 | out_unlock: |
| 3550 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3551 | kvm_release_pfn_clean(pfn); |
| 3552 | return 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3553 | } |
| 3554 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3555 | static void nonpaging_init_context(struct kvm_vcpu *vcpu, |
| 3556 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3557 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3558 | context->page_fault = nonpaging_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3559 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3560 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3561 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3562 | context->update_pte = nonpaging_update_pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3563 | context->root_level = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3564 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3565 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3566 | context->direct_map = true; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3567 | context->nx = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3568 | } |
| 3569 | |
Paolo Bonzini | d8d173d | 2013-10-02 16:56:11 +0200 | [diff] [blame] | 3570 | void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3571 | { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3572 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3573 | } |
| 3574 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3575 | static unsigned long get_cr3(struct kvm_vcpu *vcpu) |
| 3576 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3577 | return kvm_read_cr3(vcpu); |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3578 | } |
| 3579 | |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3580 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
| 3581 | struct x86_exception *fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3582 | { |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3583 | vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3584 | } |
| 3585 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 3586 | static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 3587 | unsigned access, int *nr_present) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3588 | { |
| 3589 | if (unlikely(is_mmio_spte(*sptep))) { |
| 3590 | if (gfn != get_mmio_spte_gfn(*sptep)) { |
| 3591 | mmu_spte_clear_no_track(sptep); |
| 3592 | return true; |
| 3593 | } |
| 3594 | |
| 3595 | (*nr_present)++; |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 3596 | mark_mmio_spte(vcpu, sptep, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3597 | return true; |
| 3598 | } |
| 3599 | |
| 3600 | return false; |
| 3601 | } |
| 3602 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3603 | static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte) |
| 3604 | { |
| 3605 | unsigned index; |
| 3606 | |
| 3607 | index = level - 1; |
| 3608 | index |= (gpte & PT_PAGE_SIZE_MASK) >> (PT_PAGE_SIZE_SHIFT - 2); |
| 3609 | return mmu->last_pte_bitmap & (1 << index); |
| 3610 | } |
| 3611 | |
Nadav Har'El | 37406aa | 2013-08-05 11:07:12 +0300 | [diff] [blame] | 3612 | #define PTTYPE_EPT 18 /* arbitrary */ |
| 3613 | #define PTTYPE PTTYPE_EPT |
| 3614 | #include "paging_tmpl.h" |
| 3615 | #undef PTTYPE |
| 3616 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3617 | #define PTTYPE 64 |
| 3618 | #include "paging_tmpl.h" |
| 3619 | #undef PTTYPE |
| 3620 | |
| 3621 | #define PTTYPE 32 |
| 3622 | #include "paging_tmpl.h" |
| 3623 | #undef PTTYPE |
| 3624 | |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3625 | static void |
| 3626 | __reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
| 3627 | struct rsvd_bits_validate *rsvd_check, |
| 3628 | int maxphyaddr, int level, bool nx, bool gbpages, |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3629 | bool pse, bool amd) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3630 | { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3631 | u64 exb_bit_rsvd = 0; |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3632 | u64 gbpages_bit_rsvd = 0; |
Paolo Bonzini | a0c0feb | 2014-09-02 13:24:12 +0200 | [diff] [blame] | 3633 | u64 nonleaf_bit8_rsvd = 0; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3634 | |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3635 | rsvd_check->bad_mt_xwr = 0; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3636 | |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3637 | if (!nx) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3638 | exb_bit_rsvd = rsvd_bits(63, 63); |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3639 | if (!gbpages) |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3640 | gbpages_bit_rsvd = rsvd_bits(7, 7); |
Paolo Bonzini | a0c0feb | 2014-09-02 13:24:12 +0200 | [diff] [blame] | 3641 | |
| 3642 | /* |
| 3643 | * Non-leaf PML4Es and PDPEs reserve bit 8 (which would be the G bit for |
| 3644 | * leaf entries) on AMD CPUs only. |
| 3645 | */ |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3646 | if (amd) |
Paolo Bonzini | a0c0feb | 2014-09-02 13:24:12 +0200 | [diff] [blame] | 3647 | nonleaf_bit8_rsvd = rsvd_bits(8, 8); |
| 3648 | |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3649 | switch (level) { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3650 | case PT32_ROOT_LEVEL: |
| 3651 | /* no rsvd bits for 2 level 4K page table entries */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3652 | rsvd_check->rsvd_bits_mask[0][1] = 0; |
| 3653 | rsvd_check->rsvd_bits_mask[0][0] = 0; |
| 3654 | rsvd_check->rsvd_bits_mask[1][0] = |
| 3655 | rsvd_check->rsvd_bits_mask[0][0]; |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3656 | |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3657 | if (!pse) { |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3658 | rsvd_check->rsvd_bits_mask[1][1] = 0; |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3659 | break; |
| 3660 | } |
| 3661 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3662 | if (is_cpuid_PSE36()) |
| 3663 | /* 36bits PSE 4MB page */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3664 | rsvd_check->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3665 | else |
| 3666 | /* 32 bits PSE 4MB page */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3667 | rsvd_check->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3668 | break; |
| 3669 | case PT32E_ROOT_LEVEL: |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3670 | rsvd_check->rsvd_bits_mask[0][2] = |
Dong, Eddie | 20c466b | 2009-03-31 23:03:45 +0800 | [diff] [blame] | 3671 | rsvd_bits(maxphyaddr, 63) | |
Nadav Amit | cd9ae5f | 2014-04-04 06:31:04 +0300 | [diff] [blame] | 3672 | rsvd_bits(5, 8) | rsvd_bits(1, 2); /* PDPTE */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3673 | rsvd_check->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3674 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3675 | rsvd_check->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3676 | rsvd_bits(maxphyaddr, 62); /* PTE */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3677 | rsvd_check->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3678 | rsvd_bits(maxphyaddr, 62) | |
| 3679 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3680 | rsvd_check->rsvd_bits_mask[1][0] = |
| 3681 | rsvd_check->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3682 | break; |
| 3683 | case PT64_ROOT_LEVEL: |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3684 | rsvd_check->rsvd_bits_mask[0][3] = exb_bit_rsvd | |
| 3685 | nonleaf_bit8_rsvd | rsvd_bits(7, 7) | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3686 | rsvd_bits(maxphyaddr, 51); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3687 | rsvd_check->rsvd_bits_mask[0][2] = exb_bit_rsvd | |
| 3688 | nonleaf_bit8_rsvd | gbpages_bit_rsvd | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3689 | rsvd_bits(maxphyaddr, 51); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3690 | rsvd_check->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
| 3691 | rsvd_bits(maxphyaddr, 51); |
| 3692 | rsvd_check->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3693 | rsvd_bits(maxphyaddr, 51); |
| 3694 | rsvd_check->rsvd_bits_mask[1][3] = |
| 3695 | rsvd_check->rsvd_bits_mask[0][3]; |
| 3696 | rsvd_check->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3697 | gbpages_bit_rsvd | rsvd_bits(maxphyaddr, 51) | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 3698 | rsvd_bits(13, 29); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3699 | rsvd_check->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3700 | rsvd_bits(maxphyaddr, 51) | |
| 3701 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3702 | rsvd_check->rsvd_bits_mask[1][0] = |
| 3703 | rsvd_check->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3704 | break; |
| 3705 | } |
| 3706 | } |
| 3707 | |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3708 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
| 3709 | struct kvm_mmu *context) |
| 3710 | { |
| 3711 | __reset_rsvds_bits_mask(vcpu, &context->guest_rsvd_check, |
| 3712 | cpuid_maxphyaddr(vcpu), context->root_level, |
| 3713 | context->nx, guest_cpuid_has_gbpages(vcpu), |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3714 | is_pse(vcpu), guest_cpuid_is_amd(vcpu)); |
Xiao Guangrong | 6dc98b8 | 2015-08-05 12:04:22 +0800 | [diff] [blame] | 3715 | } |
| 3716 | |
Xiao Guangrong | 81b8eeb | 2015-08-05 12:04:23 +0800 | [diff] [blame] | 3717 | static void |
| 3718 | __reset_rsvds_bits_mask_ept(struct rsvd_bits_validate *rsvd_check, |
| 3719 | int maxphyaddr, bool execonly) |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3720 | { |
Paolo Bonzini | 951f9fd | 2015-09-23 10:34:26 +0200 | [diff] [blame] | 3721 | u64 bad_mt_xwr; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3722 | |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3723 | rsvd_check->rsvd_bits_mask[0][3] = |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3724 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 7); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3725 | rsvd_check->rsvd_bits_mask[0][2] = |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3726 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 6); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3727 | rsvd_check->rsvd_bits_mask[0][1] = |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3728 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 6); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3729 | rsvd_check->rsvd_bits_mask[0][0] = rsvd_bits(maxphyaddr, 51); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3730 | |
| 3731 | /* large page */ |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3732 | rsvd_check->rsvd_bits_mask[1][3] = rsvd_check->rsvd_bits_mask[0][3]; |
| 3733 | rsvd_check->rsvd_bits_mask[1][2] = |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3734 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(12, 29); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3735 | rsvd_check->rsvd_bits_mask[1][1] = |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3736 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(12, 20); |
Xiao Guangrong | a0a64f5 | 2015-08-05 12:04:21 +0800 | [diff] [blame] | 3737 | rsvd_check->rsvd_bits_mask[1][0] = rsvd_check->rsvd_bits_mask[0][0]; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3738 | |
Paolo Bonzini | 951f9fd | 2015-09-23 10:34:26 +0200 | [diff] [blame] | 3739 | bad_mt_xwr = 0xFFull << (2 * 8); /* bits 3..5 must not be 2 */ |
| 3740 | bad_mt_xwr |= 0xFFull << (3 * 8); /* bits 3..5 must not be 3 */ |
| 3741 | bad_mt_xwr |= 0xFFull << (7 * 8); /* bits 3..5 must not be 7 */ |
| 3742 | bad_mt_xwr |= REPEAT_BYTE(1ull << 2); /* bits 0..2 must not be 010 */ |
| 3743 | bad_mt_xwr |= REPEAT_BYTE(1ull << 6); /* bits 0..2 must not be 110 */ |
| 3744 | if (!execonly) { |
| 3745 | /* bits 0..2 must not be 100 unless VMX capabilities allow it */ |
| 3746 | bad_mt_xwr |= REPEAT_BYTE(1ull << 4); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3747 | } |
Paolo Bonzini | 951f9fd | 2015-09-23 10:34:26 +0200 | [diff] [blame] | 3748 | rsvd_check->bad_mt_xwr = bad_mt_xwr; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3749 | } |
| 3750 | |
Xiao Guangrong | 81b8eeb | 2015-08-05 12:04:23 +0800 | [diff] [blame] | 3751 | static void reset_rsvds_bits_mask_ept(struct kvm_vcpu *vcpu, |
| 3752 | struct kvm_mmu *context, bool execonly) |
| 3753 | { |
| 3754 | __reset_rsvds_bits_mask_ept(&context->guest_rsvd_check, |
| 3755 | cpuid_maxphyaddr(vcpu), execonly); |
| 3756 | } |
| 3757 | |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3758 | /* |
| 3759 | * the page table on host is the shadow page table for the page |
| 3760 | * table in guest or amd nested guest, its mmu features completely |
| 3761 | * follow the features in guest. |
| 3762 | */ |
| 3763 | void |
| 3764 | reset_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, struct kvm_mmu *context) |
| 3765 | { |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3766 | /* |
| 3767 | * Passing "true" to the last argument is okay; it adds a check |
| 3768 | * on bit 8 of the SPTEs which KVM doesn't use anyway. |
| 3769 | */ |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3770 | __reset_rsvds_bits_mask(vcpu, &context->shadow_zero_check, |
| 3771 | boot_cpu_data.x86_phys_bits, |
| 3772 | context->shadow_root_level, context->nx, |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3773 | guest_cpuid_has_gbpages(vcpu), is_pse(vcpu), |
| 3774 | true); |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3775 | } |
| 3776 | EXPORT_SYMBOL_GPL(reset_shadow_zero_bits_mask); |
| 3777 | |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3778 | static inline bool boot_cpu_is_amd(void) |
| 3779 | { |
| 3780 | WARN_ON_ONCE(!tdp_enabled); |
| 3781 | return shadow_x_mask == 0; |
| 3782 | } |
| 3783 | |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3784 | /* |
| 3785 | * the direct page table on host, use as much mmu features as |
| 3786 | * possible, however, kvm currently does not do execution-protection. |
| 3787 | */ |
| 3788 | static void |
| 3789 | reset_tdp_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, |
| 3790 | struct kvm_mmu *context) |
| 3791 | { |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3792 | if (boot_cpu_is_amd()) |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3793 | __reset_rsvds_bits_mask(vcpu, &context->shadow_zero_check, |
| 3794 | boot_cpu_data.x86_phys_bits, |
| 3795 | context->shadow_root_level, false, |
Paolo Bonzini | 6fec214 | 2015-09-22 23:02:14 +0200 | [diff] [blame] | 3796 | cpu_has_gbpages, true, true); |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3797 | else |
| 3798 | __reset_rsvds_bits_mask_ept(&context->shadow_zero_check, |
| 3799 | boot_cpu_data.x86_phys_bits, |
| 3800 | false); |
| 3801 | |
| 3802 | } |
| 3803 | |
| 3804 | /* |
| 3805 | * as the comments in reset_shadow_zero_bits_mask() except it |
| 3806 | * is the shadow page table for intel nested guest. |
| 3807 | */ |
| 3808 | static void |
| 3809 | reset_ept_shadow_zero_bits_mask(struct kvm_vcpu *vcpu, |
| 3810 | struct kvm_mmu *context, bool execonly) |
| 3811 | { |
| 3812 | __reset_rsvds_bits_mask_ept(&context->shadow_zero_check, |
| 3813 | boot_cpu_data.x86_phys_bits, execonly); |
| 3814 | } |
| 3815 | |
Xiao Guangrong | edc90b7 | 2015-05-11 22:55:21 +0800 | [diff] [blame] | 3816 | static void update_permission_bitmask(struct kvm_vcpu *vcpu, |
| 3817 | struct kvm_mmu *mmu, bool ept) |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3818 | { |
| 3819 | unsigned bit, byte, pfec; |
| 3820 | u8 map; |
Feng Wu | 66386ade | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3821 | bool fault, x, w, u, wf, uf, ff, smapf, cr4_smap, cr4_smep, smap = 0; |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3822 | |
Feng Wu | 66386ade | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3823 | cr4_smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3824 | cr4_smap = kvm_read_cr4_bits(vcpu, X86_CR4_SMAP); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3825 | for (byte = 0; byte < ARRAY_SIZE(mmu->permissions); ++byte) { |
| 3826 | pfec = byte << 1; |
| 3827 | map = 0; |
| 3828 | wf = pfec & PFERR_WRITE_MASK; |
| 3829 | uf = pfec & PFERR_USER_MASK; |
| 3830 | ff = pfec & PFERR_FETCH_MASK; |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3831 | /* |
| 3832 | * PFERR_RSVD_MASK bit is set in PFEC if the access is not |
| 3833 | * subject to SMAP restrictions, and cleared otherwise. The |
| 3834 | * bit is only meaningful if the SMAP bit is set in CR4. |
| 3835 | */ |
| 3836 | smapf = !(pfec & PFERR_RSVD_MASK); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3837 | for (bit = 0; bit < 8; ++bit) { |
| 3838 | x = bit & ACC_EXEC_MASK; |
| 3839 | w = bit & ACC_WRITE_MASK; |
| 3840 | u = bit & ACC_USER_MASK; |
| 3841 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3842 | if (!ept) { |
| 3843 | /* Not really needed: !nx will cause pte.nx to fault */ |
| 3844 | x |= !mmu->nx; |
| 3845 | /* Allow supervisor writes if !cr0.wp */ |
| 3846 | w |= !is_write_protection(vcpu) && !uf; |
| 3847 | /* Disallow supervisor fetches of user code if cr4.smep */ |
Feng Wu | 66386ade | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3848 | x &= !(cr4_smep && u && !uf); |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3849 | |
| 3850 | /* |
| 3851 | * SMAP:kernel-mode data accesses from user-mode |
| 3852 | * mappings should fault. A fault is considered |
| 3853 | * as a SMAP violation if all of the following |
| 3854 | * conditions are ture: |
| 3855 | * - X86_CR4_SMAP is set in CR4 |
| 3856 | * - An user page is accessed |
| 3857 | * - Page fault in kernel mode |
| 3858 | * - if CPL = 3 or X86_EFLAGS_AC is clear |
| 3859 | * |
| 3860 | * Here, we cover the first three conditions. |
| 3861 | * The fourth is computed dynamically in |
| 3862 | * permission_fault() and is in smapf. |
| 3863 | * |
| 3864 | * Also, SMAP does not affect instruction |
| 3865 | * fetches, add the !ff check here to make it |
| 3866 | * clearer. |
| 3867 | */ |
| 3868 | smap = cr4_smap && u && !uf && !ff; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3869 | } else |
| 3870 | /* Not really needed: no U/S accesses on ept */ |
| 3871 | u = 1; |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3872 | |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3873 | fault = (ff && !x) || (uf && !u) || (wf && !w) || |
| 3874 | (smapf && smap); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3875 | map |= fault << bit; |
| 3876 | } |
| 3877 | mmu->permissions[byte] = map; |
| 3878 | } |
| 3879 | } |
| 3880 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3881 | static void update_last_pte_bitmap(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) |
| 3882 | { |
| 3883 | u8 map; |
| 3884 | unsigned level, root_level = mmu->root_level; |
| 3885 | const unsigned ps_set_index = 1 << 2; /* bit 2 of index: ps */ |
| 3886 | |
| 3887 | if (root_level == PT32E_ROOT_LEVEL) |
| 3888 | --root_level; |
| 3889 | /* PT_PAGE_TABLE_LEVEL always terminates */ |
| 3890 | map = 1 | (1 << ps_set_index); |
| 3891 | for (level = PT_DIRECTORY_LEVEL; level <= root_level; ++level) { |
| 3892 | if (level <= PT_PDPE_LEVEL |
| 3893 | && (mmu->root_level >= PT32E_ROOT_LEVEL || is_pse(vcpu))) |
| 3894 | map |= 1 << (ps_set_index | (level - 1)); |
| 3895 | } |
| 3896 | mmu->last_pte_bitmap = map; |
| 3897 | } |
| 3898 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3899 | static void paging64_init_context_common(struct kvm_vcpu *vcpu, |
| 3900 | struct kvm_mmu *context, |
| 3901 | int level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3902 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3903 | context->nx = is_nx(vcpu); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3904 | context->root_level = level; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3905 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3906 | reset_rsvds_bits_mask(vcpu, context); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3907 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3908 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3909 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 3910 | MMU_WARN_ON(!is_pae(vcpu)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3911 | context->page_fault = paging64_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3912 | context->gva_to_gpa = paging64_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3913 | context->sync_page = paging64_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3914 | context->invlpg = paging64_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3915 | context->update_pte = paging64_update_pte; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3916 | context->shadow_root_level = level; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3917 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3918 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3919 | } |
| 3920 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3921 | static void paging64_init_context(struct kvm_vcpu *vcpu, |
| 3922 | struct kvm_mmu *context) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3923 | { |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3924 | paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3925 | } |
| 3926 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3927 | static void paging32_init_context(struct kvm_vcpu *vcpu, |
| 3928 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3929 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3930 | context->nx = false; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3931 | context->root_level = PT32_ROOT_LEVEL; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3932 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3933 | reset_rsvds_bits_mask(vcpu, context); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3934 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3935 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3936 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3937 | context->page_fault = paging32_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3938 | context->gva_to_gpa = paging32_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3939 | context->sync_page = paging32_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3940 | context->invlpg = paging32_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3941 | context->update_pte = paging32_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3942 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3943 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3944 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3945 | } |
| 3946 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3947 | static void paging32E_init_context(struct kvm_vcpu *vcpu, |
| 3948 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3949 | { |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3950 | paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3951 | } |
| 3952 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3953 | static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3954 | { |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 3955 | struct kvm_mmu *context = &vcpu->arch.mmu; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3956 | |
Avi Kivity | c445f8e | 2010-12-21 16:26:01 +0200 | [diff] [blame] | 3957 | context->base_role.word = 0; |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 3958 | context->base_role.smm = is_smm(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3959 | context->page_fault = tdp_page_fault; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3960 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3961 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3962 | context->update_pte = nonpaging_update_pte; |
Sheng Yang | 67253af | 2008-04-25 10:20:22 +0800 | [diff] [blame] | 3963 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3964 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3965 | context->direct_map = true; |
Joerg Roedel | 1c97f0a | 2010-09-10 17:30:41 +0200 | [diff] [blame] | 3966 | context->set_cr3 = kvm_x86_ops->set_tdp_cr3; |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3967 | context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3968 | context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | cb659db | 2010-09-10 17:30:43 +0200 | [diff] [blame] | 3969 | context->inject_page_fault = kvm_inject_page_fault; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3970 | |
| 3971 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3972 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3973 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3974 | context->root_level = 0; |
| 3975 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3976 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3977 | context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3978 | reset_rsvds_bits_mask(vcpu, context); |
| 3979 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3980 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3981 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3982 | context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3983 | reset_rsvds_bits_mask(vcpu, context); |
| 3984 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3985 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3986 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3987 | context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3988 | reset_rsvds_bits_mask(vcpu, context); |
| 3989 | context->gva_to_gpa = paging32_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3990 | } |
| 3991 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3992 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3993 | update_last_pte_bitmap(vcpu, context); |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 3994 | reset_tdp_shadow_zero_bits_mask(vcpu, context); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3995 | } |
| 3996 | |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 3997 | void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3998 | { |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3999 | bool smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Xiao Guangrong | edc90b7 | 2015-05-11 22:55:21 +0800 | [diff] [blame] | 4000 | bool smap = kvm_read_cr4_bits(vcpu, X86_CR4_SMAP); |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 4001 | struct kvm_mmu *context = &vcpu->arch.mmu; |
| 4002 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 4003 | MMU_WARN_ON(VALID_PAGE(context->root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4004 | |
| 4005 | if (!is_paging(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4006 | nonpaging_init_context(vcpu, context); |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 4007 | else if (is_long_mode(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4008 | paging64_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4009 | else if (is_pae(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4010 | paging32E_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4011 | else |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4012 | paging32_init_context(vcpu, context); |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 4013 | |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 4014 | context->base_role.nxe = is_nx(vcpu); |
| 4015 | context->base_role.cr4_pae = !!is_pae(vcpu); |
| 4016 | context->base_role.cr0_wp = is_write_protection(vcpu); |
| 4017 | context->base_role.smep_andnot_wp |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 4018 | = smep && !is_write_protection(vcpu); |
Xiao Guangrong | edc90b7 | 2015-05-11 22:55:21 +0800 | [diff] [blame] | 4019 | context->base_role.smap_andnot_wp |
| 4020 | = smap && !is_write_protection(vcpu); |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 4021 | context->base_role.smm = is_smm(vcpu); |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 4022 | reset_shadow_zero_bits_mask(vcpu, context); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 4023 | } |
| 4024 | EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu); |
| 4025 | |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 4026 | void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly) |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 4027 | { |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 4028 | struct kvm_mmu *context = &vcpu->arch.mmu; |
| 4029 | |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 4030 | MMU_WARN_ON(VALID_PAGE(context->root_hpa)); |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 4031 | |
| 4032 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
| 4033 | |
| 4034 | context->nx = true; |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 4035 | context->page_fault = ept_page_fault; |
| 4036 | context->gva_to_gpa = ept_gva_to_gpa; |
| 4037 | context->sync_page = ept_sync_page; |
| 4038 | context->invlpg = ept_invlpg; |
| 4039 | context->update_pte = ept_update_pte; |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 4040 | context->root_level = context->shadow_root_level; |
| 4041 | context->root_hpa = INVALID_PAGE; |
| 4042 | context->direct_map = false; |
| 4043 | |
| 4044 | update_permission_bitmask(vcpu, context, true); |
| 4045 | reset_rsvds_bits_mask_ept(vcpu, context, execonly); |
Xiao Guangrong | c258b62 | 2015-08-05 12:04:24 +0800 | [diff] [blame] | 4046 | reset_ept_shadow_zero_bits_mask(vcpu, context, execonly); |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 4047 | } |
| 4048 | EXPORT_SYMBOL_GPL(kvm_init_shadow_ept_mmu); |
| 4049 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4050 | static void init_kvm_softmmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 4051 | { |
Paolo Bonzini | ad896af | 2013-10-02 16:56:14 +0200 | [diff] [blame] | 4052 | struct kvm_mmu *context = &vcpu->arch.mmu; |
| 4053 | |
| 4054 | kvm_init_shadow_mmu(vcpu); |
| 4055 | context->set_cr3 = kvm_x86_ops->set_cr3; |
| 4056 | context->get_cr3 = get_cr3; |
| 4057 | context->get_pdptr = kvm_pdptr_read; |
| 4058 | context->inject_page_fault = kvm_inject_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4059 | } |
| 4060 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4061 | static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4062 | { |
| 4063 | struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; |
| 4064 | |
| 4065 | g_context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 4066 | g_context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4067 | g_context->inject_page_fault = kvm_inject_page_fault; |
| 4068 | |
| 4069 | /* |
| 4070 | * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The |
| 4071 | * translation of l2_gpa to l1_gpa addresses is done using the |
| 4072 | * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa |
| 4073 | * functions between mmu and nested_mmu are swapped. |
| 4074 | */ |
| 4075 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 4076 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4077 | g_context->root_level = 0; |
| 4078 | g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; |
| 4079 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 4080 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4081 | g_context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 4082 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4083 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 4084 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 4085 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4086 | g_context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 4087 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4088 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 4089 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 4090 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4091 | g_context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 4092 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4093 | g_context->gva_to_gpa = paging32_gva_to_gpa_nested; |
| 4094 | } |
| 4095 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 4096 | update_permission_bitmask(vcpu, g_context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 4097 | update_last_pte_bitmap(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4098 | } |
| 4099 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4100 | static void init_kvm_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 4101 | { |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4102 | if (mmu_is_nested(vcpu)) |
Paolo Bonzini | e0c6db3 | 2014-12-23 13:39:46 +0100 | [diff] [blame] | 4103 | init_kvm_nested_mmu(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 4104 | else if (tdp_enabled) |
Paolo Bonzini | e0c6db3 | 2014-12-23 13:39:46 +0100 | [diff] [blame] | 4105 | init_kvm_tdp_mmu(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 4106 | else |
Paolo Bonzini | e0c6db3 | 2014-12-23 13:39:46 +0100 | [diff] [blame] | 4107 | init_kvm_softmmu(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 4108 | } |
| 4109 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4110 | void kvm_mmu_reset_context(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4111 | { |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 4112 | kvm_mmu_unload(vcpu); |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4113 | init_kvm_mmu(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 4114 | } |
Eddie Dong | 8668a3c | 2007-10-10 14:26:45 +0800 | [diff] [blame] | 4115 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 4116 | |
| 4117 | int kvm_mmu_load(struct kvm_vcpu *vcpu) |
| 4118 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 4119 | int r; |
| 4120 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 4121 | r = mmu_topup_memory_caches(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 4122 | if (r) |
| 4123 | goto out; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 4124 | r = mmu_alloc_roots(vcpu); |
Takuya Yoshikawa | e2858b4 | 2013-05-09 15:45:12 +0900 | [diff] [blame] | 4125 | kvm_mmu_sync_roots(vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 4126 | if (r) |
| 4127 | goto out; |
Sheng Yang | 3662cb1 | 2009-07-09 17:00:42 +0800 | [diff] [blame] | 4128 | /* set_cr3() should ensure TLB has been flushed */ |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 4129 | vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 4130 | out: |
| 4131 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4132 | } |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 4133 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
| 4134 | |
| 4135 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) |
| 4136 | { |
| 4137 | mmu_free_roots(vcpu); |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 4138 | WARN_ON(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 4139 | } |
Joerg Roedel | 4b16184 | 2010-09-10 17:31:03 +0200 | [diff] [blame] | 4140 | EXPORT_SYMBOL_GPL(kvm_mmu_unload); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4141 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 4142 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 4143 | struct kvm_mmu_page *sp, u64 *spte, |
| 4144 | const void *new) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 4145 | { |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 4146 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
Joerg Roedel | 7e4e405 | 2009-07-27 16:30:46 +0200 | [diff] [blame] | 4147 | ++vcpu->kvm->stat.mmu_pde_zapped; |
| 4148 | return; |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 4149 | } |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 4150 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4151 | ++vcpu->kvm->stat.mmu_pte_updated; |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 4152 | vcpu->arch.mmu.update_pte(vcpu, sp, spte, new); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 4153 | } |
| 4154 | |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4155 | static bool need_remote_flush(u64 old, u64 new) |
| 4156 | { |
| 4157 | if (!is_shadow_present_pte(old)) |
| 4158 | return false; |
| 4159 | if (!is_shadow_present_pte(new)) |
| 4160 | return true; |
| 4161 | if ((old ^ new) & PT64_BASE_ADDR_MASK) |
| 4162 | return true; |
Gleb Natapov | 5316622 | 2013-08-05 11:07:14 +0300 | [diff] [blame] | 4163 | old ^= shadow_nx_mask; |
| 4164 | new ^= shadow_nx_mask; |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4165 | return (old & ~new & PT64_PERM_MASK) != 0; |
| 4166 | } |
| 4167 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4168 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page, |
| 4169 | bool remote_flush, bool local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4170 | { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4171 | if (zap_page) |
| 4172 | return; |
| 4173 | |
| 4174 | if (remote_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4175 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4176 | else if (local_flush) |
Liang Chen | 77c3913 | 2014-09-18 12:38:37 -0400 | [diff] [blame] | 4177 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4178 | } |
| 4179 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4180 | static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa, |
| 4181 | const u8 *new, int *bytes) |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 4182 | { |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4183 | u64 gentry; |
| 4184 | int r; |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 4185 | |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 4186 | /* |
| 4187 | * Assume that the pte write on a page table of the same type |
Xiao Guangrong | 49b26e2 | 2011-03-04 19:00:00 +0800 | [diff] [blame] | 4188 | * as the current vcpu paging mode since we update the sptes only |
| 4189 | * when they have the same mode. |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 4190 | */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4191 | if (is_pae(vcpu) && *bytes == 4) { |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 4192 | /* Handle a 32-bit guest writing two halves of a 64-bit gpte */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4193 | *gpa &= ~(gpa_t)7; |
| 4194 | *bytes = 8; |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 4195 | r = kvm_vcpu_read_guest(vcpu, *gpa, &gentry, 8); |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 4196 | if (r) |
| 4197 | gentry = 0; |
| 4198 | new = (const u8 *)&gentry; |
| 4199 | } |
| 4200 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4201 | switch (*bytes) { |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 4202 | case 4: |
| 4203 | gentry = *(const u32 *)new; |
| 4204 | break; |
| 4205 | case 8: |
| 4206 | gentry = *(const u64 *)new; |
| 4207 | break; |
| 4208 | default: |
| 4209 | gentry = 0; |
| 4210 | break; |
| 4211 | } |
| 4212 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4213 | return gentry; |
| 4214 | } |
| 4215 | |
| 4216 | /* |
| 4217 | * If we're seeing too many writes to a page, it may no longer be a page table, |
| 4218 | * or we may be forking, in which case it is better to unmap the page. |
| 4219 | */ |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 4220 | static bool detect_write_flooding(struct kvm_mmu_page *sp) |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4221 | { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4222 | /* |
| 4223 | * Skip write-flooding detected for the sp whose level is 1, because |
| 4224 | * it can become unsync, then the guest page is not write-protected. |
| 4225 | */ |
Davidlohr Bueso | f71fa31 | 2012-04-18 12:24:29 +0200 | [diff] [blame] | 4226 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4227 | return false; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4228 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4229 | return ++sp->write_flooding_count >= 3; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4230 | } |
| 4231 | |
| 4232 | /* |
| 4233 | * Misaligned accesses are too much trouble to fix up; also, they usually |
| 4234 | * indicate a page is not used as a page table. |
| 4235 | */ |
| 4236 | static bool detect_write_misaligned(struct kvm_mmu_page *sp, gpa_t gpa, |
| 4237 | int bytes) |
| 4238 | { |
| 4239 | unsigned offset, pte_size, misaligned; |
| 4240 | |
| 4241 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", |
| 4242 | gpa, bytes, sp->role.word); |
| 4243 | |
| 4244 | offset = offset_in_page(gpa); |
| 4245 | pte_size = sp->role.cr4_pae ? 8 : 4; |
Xiao Guangrong | 5d9ca30 | 2011-09-22 16:57:55 +0800 | [diff] [blame] | 4246 | |
| 4247 | /* |
| 4248 | * Sometimes, the OS only writes the last one bytes to update status |
| 4249 | * bits, for example, in linux, andb instruction is used in clear_bit(). |
| 4250 | */ |
| 4251 | if (!(offset & (pte_size - 1)) && bytes == 1) |
| 4252 | return false; |
| 4253 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4254 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
| 4255 | misaligned |= bytes < 4; |
| 4256 | |
| 4257 | return misaligned; |
| 4258 | } |
| 4259 | |
| 4260 | static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte) |
| 4261 | { |
| 4262 | unsigned page_offset, quadrant; |
| 4263 | u64 *spte; |
| 4264 | int level; |
| 4265 | |
| 4266 | page_offset = offset_in_page(gpa); |
| 4267 | level = sp->role.level; |
| 4268 | *nspte = 1; |
| 4269 | if (!sp->role.cr4_pae) { |
| 4270 | page_offset <<= 1; /* 32->64 */ |
| 4271 | /* |
| 4272 | * A 32-bit pde maps 4MB while the shadow pdes map |
| 4273 | * only 2MB. So we need to double the offset again |
| 4274 | * and zap two pdes instead of one. |
| 4275 | */ |
| 4276 | if (level == PT32_ROOT_LEVEL) { |
| 4277 | page_offset &= ~7; /* kill rounding error */ |
| 4278 | page_offset <<= 1; |
| 4279 | *nspte = 2; |
| 4280 | } |
| 4281 | quadrant = page_offset >> PAGE_SHIFT; |
| 4282 | page_offset &= ~PAGE_MASK; |
| 4283 | if (quadrant != sp->role.quadrant) |
| 4284 | return NULL; |
| 4285 | } |
| 4286 | |
| 4287 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
| 4288 | return spte; |
| 4289 | } |
| 4290 | |
| 4291 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 4292 | const u8 *new, int bytes) |
| 4293 | { |
| 4294 | gfn_t gfn = gpa >> PAGE_SHIFT; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4295 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4296 | LIST_HEAD(invalid_list); |
| 4297 | u64 entry, gentry, *spte; |
| 4298 | int npte; |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4299 | bool remote_flush, local_flush, zap_page; |
Andrew Morton | 4141259 | 2015-05-27 11:53:06 +0200 | [diff] [blame] | 4300 | union kvm_mmu_page_role mask = { }; |
| 4301 | |
| 4302 | mask.cr0_wp = 1; |
| 4303 | mask.cr4_pae = 1; |
| 4304 | mask.nxe = 1; |
| 4305 | mask.smep_andnot_wp = 1; |
| 4306 | mask.smap_andnot_wp = 1; |
Paolo Bonzini | 699023e | 2015-05-18 15:03:39 +0200 | [diff] [blame] | 4307 | mask.smm = 1; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4308 | |
| 4309 | /* |
| 4310 | * If we don't have indirect shadow pages, it means no page is |
| 4311 | * write-protected, so we can exit simply. |
| 4312 | */ |
| 4313 | if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages)) |
| 4314 | return; |
| 4315 | |
| 4316 | zap_page = remote_flush = local_flush = false; |
| 4317 | |
| 4318 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
| 4319 | |
| 4320 | gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, new, &bytes); |
| 4321 | |
| 4322 | /* |
| 4323 | * No need to care whether allocation memory is successful |
| 4324 | * or not since pte prefetch is skiped if it does not have |
| 4325 | * enough objects in the cache. |
| 4326 | */ |
| 4327 | mmu_topup_memory_caches(vcpu); |
| 4328 | |
| 4329 | spin_lock(&vcpu->kvm->mmu_lock); |
| 4330 | ++vcpu->kvm->stat.mmu_pte_write; |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 4331 | kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4332 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 4333 | for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4334 | if (detect_write_misaligned(sp, gpa, bytes) || |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 4335 | detect_write_flooding(sp)) { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4336 | zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 4337 | &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4338 | ++vcpu->kvm->stat.mmu_flooded; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 4339 | continue; |
| 4340 | } |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4341 | |
| 4342 | spte = get_written_sptes(sp, gpa, &npte); |
| 4343 | if (!spte) |
| 4344 | continue; |
| 4345 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4346 | local_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 4347 | while (npte--) { |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4348 | entry = *spte; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 4349 | mmu_page_zap_pte(vcpu->kvm, sp, spte); |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 4350 | if (gentry && |
| 4351 | !((sp->role.word ^ vcpu->arch.mmu.base_role.word) |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 4352 | & mask.word) && rmap_can_add(vcpu)) |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 4353 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 4354 | if (need_remote_flush(entry, *spte)) |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4355 | remote_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 4356 | ++spte; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4357 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4358 | } |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4359 | mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4360 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 4361 | kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4362 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 4363 | } |
| 4364 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4365 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
| 4366 | { |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4367 | gpa_t gpa; |
| 4368 | int r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4369 | |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 4370 | if (vcpu->arch.mmu.direct_map) |
Avi Kivity | 60f2478 | 2009-08-27 13:37:06 +0300 | [diff] [blame] | 4371 | return 0; |
| 4372 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 4373 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4374 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4375 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4376 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4377 | return r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4378 | } |
Avi Kivity | 577bdc4 | 2008-07-19 08:57:05 +0300 | [diff] [blame] | 4379 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4380 | |
Takuya Yoshikawa | 81f4f76 | 2013-03-21 19:34:27 +0900 | [diff] [blame] | 4381 | static void make_mmu_pages_available(struct kvm_vcpu *vcpu) |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4382 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4383 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 103ad25 | 2010-06-04 21:54:38 +0800 | [diff] [blame] | 4384 | |
Takuya Yoshikawa | 81f4f76 | 2013-03-21 19:34:27 +0900 | [diff] [blame] | 4385 | if (likely(kvm_mmu_available_pages(vcpu->kvm) >= KVM_MIN_FREE_MMU_PAGES)) |
| 4386 | return; |
| 4387 | |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 4388 | while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES) { |
| 4389 | if (!prepare_zap_oldest_mmu_page(vcpu->kvm, &invalid_list)) |
| 4390 | break; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4391 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4392 | ++vcpu->kvm->stat.mmu_recycled; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4393 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 4394 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4395 | } |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4396 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4397 | static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr) |
| 4398 | { |
| 4399 | if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu)) |
| 4400 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 4401 | |
| 4402 | return vcpu_match_mmio_gva(vcpu, addr); |
| 4403 | } |
| 4404 | |
Andre Przywara | dc25e89 | 2010-12-21 11:12:07 +0100 | [diff] [blame] | 4405 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, |
| 4406 | void *insn, int insn_len) |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4407 | { |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4408 | int r, emulation_type = EMULTYPE_RETRY; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4409 | enum emulation_result er; |
| 4410 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 4411 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4412 | if (r < 0) |
| 4413 | goto out; |
| 4414 | |
| 4415 | if (!r) { |
| 4416 | r = 1; |
| 4417 | goto out; |
| 4418 | } |
| 4419 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4420 | if (is_mmio_page_fault(vcpu, cr2)) |
| 4421 | emulation_type = 0; |
| 4422 | |
| 4423 | er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4424 | |
| 4425 | switch (er) { |
| 4426 | case EMULATE_DONE: |
| 4427 | return 1; |
Paolo Bonzini | ac0a48c | 2013-06-25 18:24:41 +0200 | [diff] [blame] | 4428 | case EMULATE_USER_EXIT: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4429 | ++vcpu->stat.mmio_exits; |
Gleb Natapov | 6d77dbf | 2010-05-10 11:16:56 +0300 | [diff] [blame] | 4430 | /* fall through */ |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4431 | case EMULATE_FAIL: |
Avi Kivity | 3f5d18a | 2009-06-11 15:43:28 +0300 | [diff] [blame] | 4432 | return 0; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4433 | default: |
| 4434 | BUG(); |
| 4435 | } |
| 4436 | out: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4437 | return r; |
| 4438 | } |
| 4439 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); |
| 4440 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4441 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 4442 | { |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4443 | vcpu->arch.mmu.invlpg(vcpu, gva); |
Liang Chen | 77c3913 | 2014-09-18 12:38:37 -0400 | [diff] [blame] | 4444 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4445 | ++vcpu->stat.invlpg; |
| 4446 | } |
| 4447 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); |
| 4448 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 4449 | void kvm_enable_tdp(void) |
| 4450 | { |
| 4451 | tdp_enabled = true; |
| 4452 | } |
| 4453 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); |
| 4454 | |
Joerg Roedel | 5f4cb66 | 2008-07-14 20:36:36 +0200 | [diff] [blame] | 4455 | void kvm_disable_tdp(void) |
| 4456 | { |
| 4457 | tdp_enabled = false; |
| 4458 | } |
| 4459 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); |
| 4460 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4461 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
| 4462 | { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4463 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 4464 | if (vcpu->arch.mmu.lm_root != NULL) |
| 4465 | free_page((unsigned long)vcpu->arch.mmu.lm_root); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4466 | } |
| 4467 | |
| 4468 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) |
| 4469 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4470 | struct page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4471 | int i; |
| 4472 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4473 | /* |
| 4474 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. |
| 4475 | * Therefore we need to allocate shadow page tables in the first |
| 4476 | * 4GB of memory, which happens to fit the DMA32 zone. |
| 4477 | */ |
| 4478 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); |
| 4479 | if (!page) |
Wei Yongjun | d7fa6ab | 2010-01-22 16:55:05 +0800 | [diff] [blame] | 4480 | return -ENOMEM; |
| 4481 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4482 | vcpu->arch.mmu.pae_root = page_address(page); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4483 | for (i = 0; i < 4; ++i) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4484 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4485 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4486 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4487 | } |
| 4488 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4489 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4490 | { |
Xiao Guangrong | e459e32 | 2011-11-28 20:42:16 +0800 | [diff] [blame] | 4491 | vcpu->arch.walk_mmu = &vcpu->arch.mmu; |
| 4492 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
| 4493 | vcpu->arch.mmu.translate_gpa = translate_gpa; |
| 4494 | vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4495 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4496 | return alloc_mmu_pages(vcpu); |
| 4497 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4498 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4499 | void kvm_mmu_setup(struct kvm_vcpu *vcpu) |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4500 | { |
Paolo Bonzini | fa4a2c0 | 2013-10-02 16:56:16 +0200 | [diff] [blame] | 4501 | MMU_WARN_ON(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 2c26495 | 2006-12-22 01:05:28 -0800 | [diff] [blame] | 4502 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4503 | init_kvm_mmu(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4504 | } |
| 4505 | |
Xiao Guangrong | 1bad2b2 | 2015-05-13 14:42:23 +0800 | [diff] [blame] | 4506 | /* The return value indicates if tlb flush on all vcpus is needed. */ |
| 4507 | typedef bool (*slot_level_handler) (struct kvm *kvm, unsigned long *rmap); |
| 4508 | |
| 4509 | /* The caller should hold mmu-lock before calling this function. */ |
| 4510 | static bool |
| 4511 | slot_handle_level_range(struct kvm *kvm, struct kvm_memory_slot *memslot, |
| 4512 | slot_level_handler fn, int start_level, int end_level, |
| 4513 | gfn_t start_gfn, gfn_t end_gfn, bool lock_flush_tlb) |
| 4514 | { |
| 4515 | struct slot_rmap_walk_iterator iterator; |
| 4516 | bool flush = false; |
| 4517 | |
| 4518 | for_each_slot_rmap_range(memslot, start_level, end_level, start_gfn, |
| 4519 | end_gfn, &iterator) { |
| 4520 | if (iterator.rmap) |
| 4521 | flush |= fn(kvm, iterator.rmap); |
| 4522 | |
| 4523 | if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { |
| 4524 | if (flush && lock_flush_tlb) { |
| 4525 | kvm_flush_remote_tlbs(kvm); |
| 4526 | flush = false; |
| 4527 | } |
| 4528 | cond_resched_lock(&kvm->mmu_lock); |
| 4529 | } |
| 4530 | } |
| 4531 | |
| 4532 | if (flush && lock_flush_tlb) { |
| 4533 | kvm_flush_remote_tlbs(kvm); |
| 4534 | flush = false; |
| 4535 | } |
| 4536 | |
| 4537 | return flush; |
| 4538 | } |
| 4539 | |
| 4540 | static bool |
| 4541 | slot_handle_level(struct kvm *kvm, struct kvm_memory_slot *memslot, |
| 4542 | slot_level_handler fn, int start_level, int end_level, |
| 4543 | bool lock_flush_tlb) |
| 4544 | { |
| 4545 | return slot_handle_level_range(kvm, memslot, fn, start_level, |
| 4546 | end_level, memslot->base_gfn, |
| 4547 | memslot->base_gfn + memslot->npages - 1, |
| 4548 | lock_flush_tlb); |
| 4549 | } |
| 4550 | |
| 4551 | static bool |
| 4552 | slot_handle_all_level(struct kvm *kvm, struct kvm_memory_slot *memslot, |
| 4553 | slot_level_handler fn, bool lock_flush_tlb) |
| 4554 | { |
| 4555 | return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL, |
| 4556 | PT_MAX_HUGEPAGE_LEVEL, lock_flush_tlb); |
| 4557 | } |
| 4558 | |
| 4559 | static bool |
| 4560 | slot_handle_large_level(struct kvm *kvm, struct kvm_memory_slot *memslot, |
| 4561 | slot_level_handler fn, bool lock_flush_tlb) |
| 4562 | { |
| 4563 | return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL + 1, |
| 4564 | PT_MAX_HUGEPAGE_LEVEL, lock_flush_tlb); |
| 4565 | } |
| 4566 | |
| 4567 | static bool |
| 4568 | slot_handle_leaf(struct kvm *kvm, struct kvm_memory_slot *memslot, |
| 4569 | slot_level_handler fn, bool lock_flush_tlb) |
| 4570 | { |
| 4571 | return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL, |
| 4572 | PT_PAGE_TABLE_LEVEL, lock_flush_tlb); |
| 4573 | } |
| 4574 | |
Xiao Guangrong | efdfe53 | 2015-05-13 14:42:27 +0800 | [diff] [blame] | 4575 | void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) |
| 4576 | { |
| 4577 | struct kvm_memslots *slots; |
| 4578 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4579 | int i; |
Xiao Guangrong | efdfe53 | 2015-05-13 14:42:27 +0800 | [diff] [blame] | 4580 | |
| 4581 | spin_lock(&kvm->mmu_lock); |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4582 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| 4583 | slots = __kvm_memslots(kvm, i); |
| 4584 | kvm_for_each_memslot(memslot, slots) { |
| 4585 | gfn_t start, end; |
Xiao Guangrong | efdfe53 | 2015-05-13 14:42:27 +0800 | [diff] [blame] | 4586 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4587 | start = max(gfn_start, memslot->base_gfn); |
| 4588 | end = min(gfn_end, memslot->base_gfn + memslot->npages); |
| 4589 | if (start >= end) |
| 4590 | continue; |
Xiao Guangrong | efdfe53 | 2015-05-13 14:42:27 +0800 | [diff] [blame] | 4591 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4592 | slot_handle_level_range(kvm, memslot, kvm_zap_rmapp, |
| 4593 | PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL, |
| 4594 | start, end - 1, true); |
| 4595 | } |
Xiao Guangrong | efdfe53 | 2015-05-13 14:42:27 +0800 | [diff] [blame] | 4596 | } |
| 4597 | |
| 4598 | spin_unlock(&kvm->mmu_lock); |
| 4599 | } |
| 4600 | |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4601 | static bool slot_rmap_write_protect(struct kvm *kvm, unsigned long *rmapp) |
| 4602 | { |
| 4603 | return __rmap_write_protect(kvm, rmapp, false); |
| 4604 | } |
| 4605 | |
Kai Huang | 1c91cad4 | 2015-01-28 10:54:26 +0800 | [diff] [blame] | 4606 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, |
| 4607 | struct kvm_memory_slot *memslot) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4608 | { |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4609 | bool flush; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4610 | |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4611 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4612 | flush = slot_handle_all_level(kvm, memslot, slot_rmap_write_protect, |
| 4613 | false); |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4614 | spin_unlock(&kvm->mmu_lock); |
Xiao Guangrong | 198c74f | 2014-04-17 17:06:16 +0800 | [diff] [blame] | 4615 | |
| 4616 | /* |
| 4617 | * kvm_mmu_slot_remove_write_access() and kvm_vm_ioctl_get_dirty_log() |
| 4618 | * which do tlb flush out of mmu-lock should be serialized by |
| 4619 | * kvm->slots_lock otherwise tlb flush would be missed. |
| 4620 | */ |
| 4621 | lockdep_assert_held(&kvm->slots_lock); |
| 4622 | |
| 4623 | /* |
| 4624 | * We can flush all the TLBs out of the mmu lock without TLB |
| 4625 | * corruption since we just change the spte from writable to |
| 4626 | * readonly so that we only need to care the case of changing |
| 4627 | * spte from present to present (changing the spte from present |
| 4628 | * to nonpresent will flush all the TLBs immediately), in other |
| 4629 | * words, the only case we care is mmu_spte_update() where we |
| 4630 | * haved checked SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE |
| 4631 | * instead of PT_WRITABLE_MASK, that means it does not depend |
| 4632 | * on PT_WRITABLE_MASK anymore. |
| 4633 | */ |
Kai Huang | d91ffee | 2015-01-12 15:28:54 +0800 | [diff] [blame] | 4634 | if (flush) |
| 4635 | kvm_flush_remote_tlbs(kvm); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4636 | } |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 4637 | |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4638 | static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm, |
| 4639 | unsigned long *rmapp) |
| 4640 | { |
| 4641 | u64 *sptep; |
| 4642 | struct rmap_iterator iter; |
| 4643 | int need_tlb_flush = 0; |
| 4644 | pfn_t pfn; |
| 4645 | struct kvm_mmu_page *sp; |
| 4646 | |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 4647 | restart: |
| 4648 | for_each_rmap_spte(rmapp, &iter, sptep) { |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4649 | sp = page_header(__pa(sptep)); |
| 4650 | pfn = spte_to_pfn(*sptep); |
| 4651 | |
| 4652 | /* |
Xiao Guangrong | decf633 | 2015-04-14 12:04:10 +0800 | [diff] [blame] | 4653 | * We cannot do huge page mapping for indirect shadow pages, |
| 4654 | * which are found on the last rmap (level = 1) when not using |
| 4655 | * tdp; such shadow pages are synced with the page table in |
| 4656 | * the guest, and the guest page table is using 4K page size |
| 4657 | * mapping if the indirect sp has level = 1. |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4658 | */ |
| 4659 | if (sp->role.direct && |
| 4660 | !kvm_is_reserved_pfn(pfn) && |
| 4661 | PageTransCompound(pfn_to_page(pfn))) { |
| 4662 | drop_spte(kvm, sptep); |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4663 | need_tlb_flush = 1; |
Xiao Guangrong | 0d53679 | 2015-05-13 14:42:20 +0800 | [diff] [blame] | 4664 | goto restart; |
| 4665 | } |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4666 | } |
| 4667 | |
| 4668 | return need_tlb_flush; |
| 4669 | } |
| 4670 | |
| 4671 | void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm, |
Paolo Bonzini | f36f3f2 | 2015-05-18 13:20:23 +0200 | [diff] [blame] | 4672 | const struct kvm_memory_slot *memslot) |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4673 | { |
Paolo Bonzini | f36f3f2 | 2015-05-18 13:20:23 +0200 | [diff] [blame] | 4674 | /* FIXME: const-ify all uses of struct kvm_memory_slot. */ |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4675 | spin_lock(&kvm->mmu_lock); |
Paolo Bonzini | f36f3f2 | 2015-05-18 13:20:23 +0200 | [diff] [blame] | 4676 | slot_handle_leaf(kvm, (struct kvm_memory_slot *)memslot, |
| 4677 | kvm_mmu_zap_collapsible_spte, true); |
Wanpeng Li | 3ea3b7f | 2015-04-03 15:40:25 +0800 | [diff] [blame] | 4678 | spin_unlock(&kvm->mmu_lock); |
| 4679 | } |
| 4680 | |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4681 | void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm, |
| 4682 | struct kvm_memory_slot *memslot) |
| 4683 | { |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4684 | bool flush; |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4685 | |
| 4686 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4687 | flush = slot_handle_leaf(kvm, memslot, __rmap_clear_dirty, false); |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4688 | spin_unlock(&kvm->mmu_lock); |
| 4689 | |
| 4690 | lockdep_assert_held(&kvm->slots_lock); |
| 4691 | |
| 4692 | /* |
| 4693 | * It's also safe to flush TLBs out of mmu lock here as currently this |
| 4694 | * function is only used for dirty logging, in which case flushing TLB |
| 4695 | * out of mmu lock also guarantees no dirty pages will be lost in |
| 4696 | * dirty_bitmap. |
| 4697 | */ |
| 4698 | if (flush) |
| 4699 | kvm_flush_remote_tlbs(kvm); |
| 4700 | } |
| 4701 | EXPORT_SYMBOL_GPL(kvm_mmu_slot_leaf_clear_dirty); |
| 4702 | |
| 4703 | void kvm_mmu_slot_largepage_remove_write_access(struct kvm *kvm, |
| 4704 | struct kvm_memory_slot *memslot) |
| 4705 | { |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4706 | bool flush; |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4707 | |
| 4708 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4709 | flush = slot_handle_large_level(kvm, memslot, slot_rmap_write_protect, |
| 4710 | false); |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4711 | spin_unlock(&kvm->mmu_lock); |
| 4712 | |
| 4713 | /* see kvm_mmu_slot_remove_write_access */ |
| 4714 | lockdep_assert_held(&kvm->slots_lock); |
| 4715 | |
| 4716 | if (flush) |
| 4717 | kvm_flush_remote_tlbs(kvm); |
| 4718 | } |
| 4719 | EXPORT_SYMBOL_GPL(kvm_mmu_slot_largepage_remove_write_access); |
| 4720 | |
| 4721 | void kvm_mmu_slot_set_dirty(struct kvm *kvm, |
| 4722 | struct kvm_memory_slot *memslot) |
| 4723 | { |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4724 | bool flush; |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4725 | |
| 4726 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | d77aa73 | 2015-05-13 14:42:24 +0800 | [diff] [blame] | 4727 | flush = slot_handle_all_level(kvm, memslot, __rmap_set_dirty, false); |
Kai Huang | f4b4b18 | 2015-01-28 10:54:24 +0800 | [diff] [blame] | 4728 | spin_unlock(&kvm->mmu_lock); |
| 4729 | |
| 4730 | lockdep_assert_held(&kvm->slots_lock); |
| 4731 | |
| 4732 | /* see kvm_mmu_slot_leaf_clear_dirty */ |
| 4733 | if (flush) |
| 4734 | kvm_flush_remote_tlbs(kvm); |
| 4735 | } |
| 4736 | EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty); |
| 4737 | |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4738 | #define BATCH_ZAP_PAGES 10 |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4739 | static void kvm_zap_obsolete_pages(struct kvm *kvm) |
| 4740 | { |
| 4741 | struct kvm_mmu_page *sp, *node; |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4742 | int batch = 0; |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4743 | |
| 4744 | restart: |
| 4745 | list_for_each_entry_safe_reverse(sp, node, |
| 4746 | &kvm->arch.active_mmu_pages, link) { |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4747 | int ret; |
| 4748 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4749 | /* |
| 4750 | * No obsolete page exists before new created page since |
| 4751 | * active_mmu_pages is the FIFO list. |
| 4752 | */ |
| 4753 | if (!is_obsolete_sp(kvm, sp)) |
| 4754 | break; |
| 4755 | |
| 4756 | /* |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4757 | * Since we are reversely walking the list and the invalid |
| 4758 | * list will be moved to the head, skip the invalid page |
| 4759 | * can help us to avoid the infinity list walking. |
| 4760 | */ |
| 4761 | if (sp->role.invalid) |
| 4762 | continue; |
| 4763 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4764 | /* |
| 4765 | * Need not flush tlb since we only zap the sp with invalid |
| 4766 | * generation number. |
| 4767 | */ |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4768 | if (batch >= BATCH_ZAP_PAGES && |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4769 | cond_resched_lock(&kvm->mmu_lock)) { |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4770 | batch = 0; |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4771 | goto restart; |
| 4772 | } |
| 4773 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4774 | ret = kvm_mmu_prepare_zap_page(kvm, sp, |
| 4775 | &kvm->arch.zapped_obsolete_pages); |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4776 | batch += ret; |
| 4777 | |
| 4778 | if (ret) |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4779 | goto restart; |
| 4780 | } |
| 4781 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4782 | /* |
| 4783 | * Should flush tlb before free page tables since lockless-walking |
| 4784 | * may use the pages. |
| 4785 | */ |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4786 | kvm_mmu_commit_zap_page(kvm, &kvm->arch.zapped_obsolete_pages); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4787 | } |
| 4788 | |
| 4789 | /* |
| 4790 | * Fast invalidate all shadow pages and use lock-break technique |
| 4791 | * to zap obsolete pages. |
| 4792 | * |
| 4793 | * It's required when memslot is being deleted or VM is being |
| 4794 | * destroyed, in these cases, we should ensure that KVM MMU does |
| 4795 | * not use any resource of the being-deleted slot or all slots |
| 4796 | * after calling the function. |
| 4797 | */ |
| 4798 | void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm) |
| 4799 | { |
| 4800 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | 3500612 | 2013-05-31 08:36:25 +0800 | [diff] [blame] | 4801 | trace_kvm_mmu_invalidate_zap_all_pages(kvm); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4802 | kvm->arch.mmu_valid_gen++; |
| 4803 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4804 | /* |
| 4805 | * Notify all vcpus to reload its shadow page table |
| 4806 | * and flush TLB. Then all vcpus will switch to new |
| 4807 | * shadow page table with the new mmu_valid_gen. |
| 4808 | * |
| 4809 | * Note: we should do this under the protection of |
| 4810 | * mmu-lock, otherwise, vcpu would purge shadow page |
| 4811 | * but miss tlb flush. |
| 4812 | */ |
| 4813 | kvm_reload_remote_mmus(kvm); |
| 4814 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4815 | kvm_zap_obsolete_pages(kvm); |
| 4816 | spin_unlock(&kvm->mmu_lock); |
| 4817 | } |
| 4818 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4819 | static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm) |
| 4820 | { |
| 4821 | return unlikely(!list_empty_careful(&kvm->arch.zapped_obsolete_pages)); |
| 4822 | } |
| 4823 | |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 4824 | void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, struct kvm_memslots *slots) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4825 | { |
| 4826 | /* |
| 4827 | * The very rare case: if the generation-number is round, |
| 4828 | * zap all shadow pages. |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4829 | */ |
Paolo Bonzini | 54bf36a | 2015-04-08 15:39:23 +0200 | [diff] [blame] | 4830 | if (unlikely((slots->generation & MMIO_GEN_MASK) == 0)) { |
Paolo Bonzini | a629df7 | 2014-12-22 10:43:39 +0100 | [diff] [blame] | 4831 | printk_ratelimited(KERN_DEBUG "kvm: zapping shadow pages for mmio generation wraparound\n"); |
Xiao Guangrong | a8eca9d | 2013-06-10 16:28:55 +0800 | [diff] [blame] | 4832 | kvm_mmu_invalidate_zap_all_pages(kvm); |
Takuya Yoshikawa | 7a2e8aa | 2013-06-21 01:34:31 +0900 | [diff] [blame] | 4833 | } |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4834 | } |
| 4835 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4836 | static unsigned long |
| 4837 | mmu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4838 | { |
| 4839 | struct kvm *kvm; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4840 | int nr_to_scan = sc->nr_to_scan; |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4841 | unsigned long freed = 0; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4842 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 4843 | spin_lock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4844 | |
| 4845 | list_for_each_entry(kvm, &vm_list, vm_list) { |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4846 | int idx; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4847 | LIST_HEAD(invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4848 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4849 | /* |
Takuya Yoshikawa | 35f2d16 | 2012-08-20 18:35:39 +0900 | [diff] [blame] | 4850 | * Never scan more than sc->nr_to_scan VM instances. |
| 4851 | * Will not hit this condition practically since we do not try |
| 4852 | * to shrink more than one VM and it is very unlikely to see |
| 4853 | * !n_used_mmu_pages so many times. |
| 4854 | */ |
| 4855 | if (!nr_to_scan--) |
| 4856 | break; |
| 4857 | /* |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4858 | * n_used_mmu_pages is accessed without holding kvm->mmu_lock |
| 4859 | * here. We may skip a VM instance errorneosly, but we do not |
| 4860 | * want to shrink a VM that only started to populate its MMU |
| 4861 | * anyway. |
| 4862 | */ |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4863 | if (!kvm->arch.n_used_mmu_pages && |
| 4864 | !kvm_has_zapped_obsolete_pages(kvm)) |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4865 | continue; |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4866 | |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4867 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4868 | spin_lock(&kvm->mmu_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4869 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4870 | if (kvm_has_zapped_obsolete_pages(kvm)) { |
| 4871 | kvm_mmu_commit_zap_page(kvm, |
| 4872 | &kvm->arch.zapped_obsolete_pages); |
| 4873 | goto unlock; |
| 4874 | } |
| 4875 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4876 | if (prepare_zap_oldest_mmu_page(kvm, &invalid_list)) |
| 4877 | freed++; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4878 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4879 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4880 | unlock: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4881 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4882 | srcu_read_unlock(&kvm->srcu, idx); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4883 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4884 | /* |
| 4885 | * unfair on small ones |
| 4886 | * per-vm shrinkers cry out |
| 4887 | * sadness comes quickly |
| 4888 | */ |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4889 | list_move_tail(&kvm->vm_list, &vm_list); |
| 4890 | break; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4891 | } |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4892 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 4893 | spin_unlock(&kvm_lock); |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4894 | return freed; |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4895 | } |
| 4896 | |
| 4897 | static unsigned long |
| 4898 | mmu_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
| 4899 | { |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4900 | return percpu_counter_read_positive(&kvm_total_used_mmu_pages); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4901 | } |
| 4902 | |
| 4903 | static struct shrinker mmu_shrinker = { |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4904 | .count_objects = mmu_shrink_count, |
| 4905 | .scan_objects = mmu_shrink_scan, |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4906 | .seeks = DEFAULT_SEEKS * 10, |
| 4907 | }; |
| 4908 | |
Ingo Molnar | 2ddfd20 | 2008-05-22 10:37:48 +0200 | [diff] [blame] | 4909 | static void mmu_destroy_caches(void) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4910 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4911 | if (pte_list_desc_cache) |
| 4912 | kmem_cache_destroy(pte_list_desc_cache); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4913 | if (mmu_page_header_cache) |
| 4914 | kmem_cache_destroy(mmu_page_header_cache); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4915 | } |
| 4916 | |
| 4917 | int kvm_mmu_module_init(void) |
| 4918 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4919 | pte_list_desc_cache = kmem_cache_create("pte_list_desc", |
| 4920 | sizeof(struct pte_list_desc), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4921 | 0, 0, NULL); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4922 | if (!pte_list_desc_cache) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4923 | goto nomem; |
| 4924 | |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4925 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
| 4926 | sizeof(struct kvm_mmu_page), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4927 | 0, 0, NULL); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4928 | if (!mmu_page_header_cache) |
| 4929 | goto nomem; |
| 4930 | |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 4931 | if (percpu_counter_init(&kvm_total_used_mmu_pages, 0, GFP_KERNEL)) |
Wei Yongjun | 45bf21a | 2010-08-23 16:13:15 +0800 | [diff] [blame] | 4932 | goto nomem; |
| 4933 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4934 | register_shrinker(&mmu_shrinker); |
| 4935 | |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4936 | return 0; |
| 4937 | |
| 4938 | nomem: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4939 | mmu_destroy_caches(); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4940 | return -ENOMEM; |
| 4941 | } |
| 4942 | |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4943 | /* |
| 4944 | * Caculate mmu pages needed for kvm. |
| 4945 | */ |
| 4946 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) |
| 4947 | { |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4948 | unsigned int nr_mmu_pages; |
| 4949 | unsigned int nr_pages = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 4950 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4951 | struct kvm_memory_slot *memslot; |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4952 | int i; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4953 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4954 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| 4955 | slots = __kvm_memslots(kvm, i); |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 4956 | |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4957 | kvm_for_each_memslot(memslot, slots) |
| 4958 | nr_pages += memslot->npages; |
| 4959 | } |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4960 | |
| 4961 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; |
| 4962 | nr_mmu_pages = max(nr_mmu_pages, |
Paolo Bonzini | 9da0e4d | 2015-05-18 13:33:16 +0200 | [diff] [blame] | 4963 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4964 | |
| 4965 | return nr_mmu_pages; |
| 4966 | } |
| 4967 | |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4968 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
| 4969 | { |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 4970 | kvm_mmu_unload(vcpu); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4971 | free_mmu_pages(vcpu); |
| 4972 | mmu_free_memory_caches(vcpu); |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4973 | } |
| 4974 | |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4975 | void kvm_mmu_module_exit(void) |
| 4976 | { |
| 4977 | mmu_destroy_caches(); |
| 4978 | percpu_counter_destroy(&kvm_total_used_mmu_pages); |
| 4979 | unregister_shrinker(&mmu_shrinker); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4980 | mmu_audit_disable(); |
| 4981 | } |