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Eddie Dong1fd4f2a2007-07-18 12:03:39 +03001/*
2 * Copyright (C) 2001 MandrakeSoft S.A.
Avi Kivity221d0592010-05-23 18:37:00 +03003 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
Eddie Dong1fd4f2a2007-07-18 12:03:39 +03004 *
5 * MandrakeSoft S.A.
6 * 43, rue d'Aboukir
7 * 75002 Paris - France
8 * http://www.linux-mandrake.com/
9 * http://www.mandrakesoft.com/
10 *
11 * This library is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
15 *
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this library; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 * Yunhong Jiang <yunhong.jiang@intel.com>
26 * Yaozu (Eddie) Dong <eddie.dong@intel.com>
27 * Based on Xen 3.1 code.
28 */
29
Avi Kivityedf88412007-12-16 11:02:48 +020030#include <linux/kvm_host.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030031#include <linux/kvm.h>
32#include <linux/mm.h>
33#include <linux/highmem.h>
34#include <linux/smp.h>
35#include <linux/hrtimer.h>
36#include <linux/io.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Yang Zhangc7c9c562013-01-25 10:18:51 +080038#include <linux/export.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030039#include <asm/processor.h>
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030040#include <asm/page.h>
41#include <asm/current.h>
Gleb Natapov1000ff82009-07-07 16:00:57 +030042#include <trace/events/kvm.h>
Zhang Xiantao82470192007-12-17 13:59:56 +080043
44#include "ioapic.h"
45#include "lapic.h"
Marcelo Tosattif5244722008-07-26 17:01:00 -030046#include "irq.h"
Zhang Xiantao82470192007-12-17 13:59:56 +080047
Laurent Viviere25e3ed2007-10-12 11:01:59 +020048#if 0
49#define ioapic_debug(fmt,arg...) printk(KERN_WARNING fmt,##arg)
50#else
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030051#define ioapic_debug(fmt, arg...)
Laurent Viviere25e3ed2007-10-12 11:01:59 +020052#endif
Yang Zhangaa2fbe62013-04-11 19:21:40 +080053static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq,
54 bool line_status);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030055
56static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
57 unsigned long addr,
58 unsigned long length)
59{
60 unsigned long result = 0;
61
62 switch (ioapic->ioregsel) {
63 case IOAPIC_REG_VERSION:
64 result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
65 | (IOAPIC_VERSION_ID & 0xff));
66 break;
67
68 case IOAPIC_REG_APIC_ID:
69 case IOAPIC_REG_ARB_ID:
70 result = ((ioapic->id & 0xf) << 24);
71 break;
72
73 default:
74 {
75 u32 redir_index = (ioapic->ioregsel - 0x10) >> 1;
76 u64 redir_content;
77
Andy Honiga2c118b2013-02-20 14:49:16 -080078 if (redir_index < IOAPIC_NUM_PINS)
79 redir_content =
80 ioapic->redirtbl[redir_index].bits;
81 else
82 redir_content = ~0ULL;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030083
Eddie Dong1fd4f2a2007-07-18 12:03:39 +030084 result = (ioapic->ioregsel & 0x1) ?
85 (redir_content >> 32) & 0xffffffff :
86 redir_content & 0xffffffff;
87 break;
88 }
89 }
90
91 return result;
92}
93
Yang Zhang10606912013-04-11 19:21:38 +080094static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
95{
96 ioapic->rtc_status.pending_eoi = 0;
97 bitmap_zero(ioapic->rtc_status.dest_map, KVM_MAX_VCPUS);
98}
99
100static void __rtc_irq_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
101{
102 bool new_val, old_val;
103 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
104 union kvm_ioapic_redirect_entry *e;
105
106 e = &ioapic->redirtbl[RTC_GSI];
107 if (!kvm_apic_match_dest(vcpu, NULL, 0, e->fields.dest_id,
108 e->fields.dest_mode))
109 return;
110
111 new_val = kvm_apic_pending_eoi(vcpu, e->fields.vector);
112 old_val = test_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
113
114 if (new_val == old_val)
115 return;
116
117 if (new_val) {
118 __set_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
119 ioapic->rtc_status.pending_eoi++;
120 } else {
121 __clear_bit(vcpu->vcpu_id, ioapic->rtc_status.dest_map);
122 ioapic->rtc_status.pending_eoi--;
123 }
124
125 WARN_ON(ioapic->rtc_status.pending_eoi < 0);
126}
127
128void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
129{
130 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
131
132 spin_lock(&ioapic->lock);
133 __rtc_irq_eoi_tracking_restore_one(vcpu);
134 spin_unlock(&ioapic->lock);
135}
136
137static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic)
138{
139 struct kvm_vcpu *vcpu;
140 int i;
141
142 if (RTC_GSI >= IOAPIC_NUM_PINS)
143 return;
144
145 rtc_irq_eoi_tracking_reset(ioapic);
146 kvm_for_each_vcpu(i, vcpu, ioapic->kvm)
147 __rtc_irq_eoi_tracking_restore_one(vcpu);
148}
149
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800150static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx,
151 bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300152{
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800153 union kvm_ioapic_redirect_entry *pent;
Gleb Natapov49256632009-02-04 17:28:14 +0200154 int injected = -1;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300155
156 pent = &ioapic->redirtbl[idx];
157
158 if (!pent->fields.mask) {
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800159 injected = ioapic_deliver(ioapic, idx, line_status);
Marcelo Tosattiff4b9df2008-06-05 00:08:11 -0300160 if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300161 pent->fields.remote_irr = 1;
162 }
Gleb Natapov49256632009-02-04 17:28:14 +0200163
164 return injected;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300165}
166
Avi Kivity46a929b2009-12-28 14:08:30 +0200167static void update_handled_vectors(struct kvm_ioapic *ioapic)
168{
169 DECLARE_BITMAP(handled_vectors, 256);
170 int i;
171
172 memset(handled_vectors, 0, sizeof(handled_vectors));
173 for (i = 0; i < IOAPIC_NUM_PINS; ++i)
174 __set_bit(ioapic->redirtbl[i].fields.vector, handled_vectors);
175 memcpy(ioapic->handled_vectors, handled_vectors,
176 sizeof(handled_vectors));
177 smp_wmb();
178}
179
Yang Zhangc7c9c562013-01-25 10:18:51 +0800180void kvm_ioapic_calculate_eoi_exitmap(struct kvm_vcpu *vcpu,
181 u64 *eoi_exit_bitmap)
182{
183 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
184 union kvm_ioapic_redirect_entry *e;
Yang Zhangc7c9c562013-01-25 10:18:51 +0800185 int index;
186
187 spin_lock(&ioapic->lock);
188 /* traverse ioapic entry to set eoi exit bitmap*/
189 for (index = 0; index < IOAPIC_NUM_PINS; index++) {
190 e = &ioapic->redirtbl[index];
191 if (!e->fields.mask &&
192 (e->fields.trig_mode == IOAPIC_LEVEL_TRIG ||
193 kvm_irq_has_notifier(ioapic->kvm, KVM_IRQCHIP_IOAPIC,
Yang Zhangf3bff632013-04-11 19:21:39 +0800194 index) || index == RTC_GSI)) {
Yang Zhang44944d42013-04-07 08:25:18 +0800195 if (kvm_apic_match_dest(vcpu, NULL, 0,
196 e->fields.dest_id, e->fields.dest_mode))
197 __set_bit(e->fields.vector, (unsigned long *)eoi_exit_bitmap);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800198 }
199 }
200 spin_unlock(&ioapic->lock);
201}
202EXPORT_SYMBOL_GPL(kvm_ioapic_calculate_eoi_exitmap);
203
204void kvm_ioapic_make_eoibitmap_request(struct kvm *kvm)
205{
206 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
207
208 if (!kvm_apic_vid_enabled(kvm) || !ioapic)
209 return;
210 kvm_make_update_eoibitmap_request(kvm);
211}
212
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300213static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
214{
215 unsigned index;
Avi Kivity75858a82009-01-04 17:10:50 +0200216 bool mask_before, mask_after;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300217 union kvm_ioapic_redirect_entry *e;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300218
219 switch (ioapic->ioregsel) {
220 case IOAPIC_REG_VERSION:
221 /* Writes are ignored. */
222 break;
223
224 case IOAPIC_REG_APIC_ID:
225 ioapic->id = (val >> 24) & 0xf;
226 break;
227
228 case IOAPIC_REG_ARB_ID:
229 break;
230
231 default:
232 index = (ioapic->ioregsel - 0x10) >> 1;
233
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200234 ioapic_debug("change redir index %x val %x\n", index, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300235 if (index >= IOAPIC_NUM_PINS)
236 return;
Gleb Natapov70f93da2009-07-05 18:48:12 +0300237 e = &ioapic->redirtbl[index];
238 mask_before = e->fields.mask;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300239 if (ioapic->ioregsel & 1) {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300240 e->bits &= 0xffffffff;
241 e->bits |= (u64) val << 32;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300242 } else {
Gleb Natapov70f93da2009-07-05 18:48:12 +0300243 e->bits &= ~0xffffffffULL;
244 e->bits |= (u32) val;
245 e->fields.remote_irr = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300246 }
Avi Kivity46a929b2009-12-28 14:08:30 +0200247 update_handled_vectors(ioapic);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300248 mask_after = e->fields.mask;
Avi Kivity75858a82009-01-04 17:10:50 +0200249 if (mask_before != mask_after)
Gleb Natapov4a994352010-07-11 15:32:23 +0300250 kvm_fire_mask_notifiers(ioapic->kvm, KVM_IRQCHIP_IOAPIC, index, mask_after);
Gleb Natapov70f93da2009-07-05 18:48:12 +0300251 if (e->fields.trig_mode == IOAPIC_LEVEL_TRIG
Gleb Natapovb4a2f5e2009-07-05 18:48:11 +0300252 && ioapic->irr & (1 << index))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800253 ioapic_service(ioapic, index, false);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800254 kvm_ioapic_make_eoibitmap_request(ioapic->kvm);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300255 break;
256 }
257}
258
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800259static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300260{
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200261 union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
262 struct kvm_lapic_irq irqe;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300263
264 ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200265 "vector=%x trig_mode=%x\n",
Liu Yuana38f84c2011-04-21 14:53:57 +0800266 entry->fields.dest_id, entry->fields.dest_mode,
Gleb Natapov58c2dde2009-03-05 16:35:04 +0200267 entry->fields.delivery_mode, entry->fields.vector,
268 entry->fields.trig_mode);
269
270 irqe.dest_id = entry->fields.dest_id;
271 irqe.vector = entry->fields.vector;
272 irqe.dest_mode = entry->fields.dest_mode;
273 irqe.trig_mode = entry->fields.trig_mode;
274 irqe.delivery_mode = entry->fields.delivery_mode << 8;
275 irqe.level = 1;
276 irqe.shorthand = 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300277
Yang Zhangb4f22252013-04-11 19:21:37 +0800278 return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300279}
280
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300281int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800282 int level, bool line_status)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300283{
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300284 u32 old_irr;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300285 u32 mask = 1 << irq;
Sheng Yangcf9e4e12009-02-11 16:03:36 +0800286 union kvm_ioapic_redirect_entry entry;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300287 int ret, irq_level;
288
289 BUG_ON(irq < 0 || irq >= IOAPIC_NUM_PINS);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300290
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300291 spin_lock(&ioapic->lock);
Marcelo Tosatti07dc7262010-06-02 11:26:26 -0300292 old_irr = ioapic->irr;
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300293 irq_level = __kvm_irq_line_state(&ioapic->irq_states[irq],
294 irq_source_id, level);
295 entry = ioapic->redirtbl[irq];
296 irq_level ^= entry.fields.polarity;
297 if (!irq_level) {
298 ioapic->irr &= ~mask;
299 ret = 1;
300 } else {
301 int edge = (entry.fields.trig_mode == IOAPIC_EDGE_TRIG);
302 ioapic->irr |= mask;
303 if ((edge && old_irr != ioapic->irr) ||
304 (!edge && !entry.fields.remote_irr))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800305 ret = ioapic_service(ioapic, irq, line_status);
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300306 else
307 ret = 0; /* report coalesced interrupt */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300308 }
Michael S. Tsirkin28a6fda2012-08-14 19:20:28 +0300309 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300310 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300311
Gleb Natapov49256632009-02-04 17:28:14 +0200312 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300313}
314
Michael S. Tsirkin1a577b722012-07-19 13:45:20 +0300315void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id)
316{
317 int i;
318
319 spin_lock(&ioapic->lock);
320 for (i = 0; i < KVM_IOAPIC_NUM_PINS; i++)
321 __clear_bit(irq_source_id, &ioapic->irq_states[i]);
322 spin_unlock(&ioapic->lock);
323}
324
Yang Zhang1fcc7892013-04-11 19:21:35 +0800325static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
326 struct kvm_ioapic *ioapic, int vector, int trigger_mode)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300327{
Gleb Natapoveba02262009-08-24 11:54:25 +0300328 int i;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300329
Gleb Natapoveba02262009-08-24 11:54:25 +0300330 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
331 union kvm_ioapic_redirect_entry *ent = &ioapic->redirtbl[i];
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300332
Gleb Natapoveba02262009-08-24 11:54:25 +0300333 if (ent->fields.vector != vector)
334 continue;
Marcelo Tosattif5244722008-07-26 17:01:00 -0300335
Gleb Natapoveba02262009-08-24 11:54:25 +0300336 /*
337 * We are dropping lock while calling ack notifiers because ack
338 * notifier callbacks for assigned devices call into IOAPIC
339 * recursively. Since remote_irr is cleared only after call
340 * to notifiers if the same vector will be delivered while lock
341 * is dropped it will be put into irr and will be delivered
342 * after ack notifier returns.
343 */
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300344 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300345 kvm_notify_acked_irq(ioapic->kvm, KVM_IRQCHIP_IOAPIC, i);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300346 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300347
348 if (trigger_mode != IOAPIC_LEVEL_TRIG)
349 continue;
350
Marcelo Tosattif5244722008-07-26 17:01:00 -0300351 ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
352 ent->fields.remote_irr = 0;
Gleb Natapoveba02262009-08-24 11:54:25 +0300353 if (!ent->fields.mask && (ioapic->irr & (1 << i)))
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800354 ioapic_service(ioapic, i, false);
Marcelo Tosattif5244722008-07-26 17:01:00 -0300355 }
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300356}
357
Michael S. Tsirkina0c9a8222012-04-11 18:49:55 +0300358bool kvm_ioapic_handles_vector(struct kvm *kvm, int vector)
359{
360 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
361 smp_rmb();
362 return test_bit(vector, ioapic->handled_vectors);
363}
364
Yang Zhang1fcc7892013-04-11 19:21:35 +0800365void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector, int trigger_mode)
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700366{
Yang Zhang1fcc7892013-04-11 19:21:35 +0800367 struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700368
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300369 spin_lock(&ioapic->lock);
Yang Zhang1fcc7892013-04-11 19:21:35 +0800370 __kvm_ioapic_update_eoi(vcpu, ioapic, vector, trigger_mode);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300371 spin_unlock(&ioapic->lock);
Avi Kivity4fa6b9c2008-06-17 15:36:36 -0700372}
373
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400374static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
375{
376 return container_of(dev, struct kvm_ioapic, dev);
377}
378
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300379static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300380{
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300381 return ((addr >= ioapic->base_address &&
382 (addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
383}
384
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300385static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
386 void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300387{
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400388 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300389 u32 result;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300390 if (!ioapic_in_range(ioapic, addr))
391 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300392
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200393 ioapic_debug("addr %lx\n", (unsigned long)addr);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300394 ASSERT(!(addr & 0xf)); /* check alignment */
395
396 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300397 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300398 switch (addr) {
399 case IOAPIC_REG_SELECT:
400 result = ioapic->ioregsel;
401 break;
402
403 case IOAPIC_REG_WINDOW:
404 result = ioapic_read_indirect(ioapic, addr, len);
405 break;
406
407 default:
408 result = 0;
409 break;
410 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300411 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300412
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300413 switch (len) {
414 case 8:
415 *(u64 *) val = result;
416 break;
417 case 1:
418 case 2:
419 case 4:
420 memcpy(val, (char *)&result, len);
421 break;
422 default:
423 printk(KERN_WARNING "ioapic: wrong length %d\n", len);
424 }
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300425 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300426}
427
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300428static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
429 const void *val)
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300430{
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400431 struct kvm_ioapic *ioapic = to_ioapic(this);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300432 u32 data;
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300433 if (!ioapic_in_range(ioapic, addr))
434 return -EOPNOTSUPP;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300435
Laurent Viviere25e3ed2007-10-12 11:01:59 +0200436 ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
437 (void*)addr, len, val);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300438 ASSERT(!(addr & 0xf)); /* check alignment */
Marcelo Tosatti60eead72009-06-04 15:08:23 -0300439
Julian Stecklinad77fe632011-11-23 13:54:30 +0100440 switch (len) {
441 case 8:
442 case 4:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300443 data = *(u32 *) val;
Julian Stecklinad77fe632011-11-23 13:54:30 +0100444 break;
445 case 2:
446 data = *(u16 *) val;
447 break;
448 case 1:
449 data = *(u8 *) val;
450 break;
451 default:
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300452 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
Gleb Natapoveba02262009-08-24 11:54:25 +0300453 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300454 }
455
456 addr &= 0xff;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300457 spin_lock(&ioapic->lock);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300458 switch (addr) {
459 case IOAPIC_REG_SELECT:
Julian Stecklinad77fe632011-11-23 13:54:30 +0100460 ioapic->ioregsel = data & 0xFF; /* 8-bit register */
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300461 break;
462
463 case IOAPIC_REG_WINDOW:
464 ioapic_write_indirect(ioapic, data);
465 break;
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800466#ifdef CONFIG_IA64
467 case IOAPIC_REG_EOI:
Yang Zhang1fcc7892013-04-11 19:21:35 +0800468 __kvm_ioapic_update_eoi(NULL, ioapic, data, IOAPIC_LEVEL_TRIG);
Zhang Xiantaob1fd3d32007-12-02 22:53:07 +0800469 break;
470#endif
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300471
472 default:
473 break;
474 }
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300475 spin_unlock(&ioapic->lock);
Michael S. Tsirkinbda90202009-06-29 22:24:32 +0300476 return 0;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300477}
478
Eddie Dong8c392692007-10-10 12:15:54 +0200479void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
480{
481 int i;
482
483 for (i = 0; i < IOAPIC_NUM_PINS; i++)
484 ioapic->redirtbl[i].fields.mask = 1;
485 ioapic->base_address = IOAPIC_DEFAULT_BASE_ADDRESS;
486 ioapic->ioregsel = 0;
487 ioapic->irr = 0;
488 ioapic->id = 0;
Yang Zhang10606912013-04-11 19:21:38 +0800489 rtc_irq_eoi_tracking_reset(ioapic);
Avi Kivity46a929b2009-12-28 14:08:30 +0200490 update_handled_vectors(ioapic);
Eddie Dong8c392692007-10-10 12:15:54 +0200491}
492
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400493static const struct kvm_io_device_ops ioapic_mmio_ops = {
494 .read = ioapic_mmio_read,
495 .write = ioapic_mmio_write,
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400496};
497
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300498int kvm_ioapic_init(struct kvm *kvm)
499{
500 struct kvm_ioapic *ioapic;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400501 int ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300502
503 ioapic = kzalloc(sizeof(struct kvm_ioapic), GFP_KERNEL);
504 if (!ioapic)
505 return -ENOMEM;
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300506 spin_lock_init(&ioapic->lock);
Zhang Xiantaod7deeeb02007-12-14 10:17:34 +0800507 kvm->arch.vioapic = ioapic;
Eddie Dong8c392692007-10-10 12:15:54 +0200508 kvm_ioapic_reset(ioapic);
Gregory Haskinsd76685c42009-06-01 12:54:50 -0400509 kvm_iodevice_init(&ioapic->dev, &ioapic_mmio_ops);
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300510 ioapic->kvm = kvm;
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200511 mutex_lock(&kvm->slots_lock);
Sasha Levin743eeb02011-07-27 16:00:48 +0300512 ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, ioapic->base_address,
513 IOAPIC_MEM_LENGTH, &ioapic->dev);
Marcelo Tosatti79fac952009-12-23 14:35:26 -0200514 mutex_unlock(&kvm->slots_lock);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800515 if (ret < 0) {
516 kvm->arch.vioapic = NULL;
Gregory Haskins090b7af2009-07-07 17:08:44 -0400517 kfree(ioapic);
Wei Yongjun1ae77ba2010-02-09 10:31:09 +0800518 }
Gregory Haskins090b7af2009-07-07 17:08:44 -0400519
520 return ret;
Eddie Dong1fd4f2a2007-07-18 12:03:39 +0300521}
Avi Kivity75858a82009-01-04 17:10:50 +0200522
Wei Yongjun72bb2fc2010-02-09 10:33:03 +0800523void kvm_ioapic_destroy(struct kvm *kvm)
524{
525 struct kvm_ioapic *ioapic = kvm->arch.vioapic;
526
527 if (ioapic) {
528 kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &ioapic->dev);
529 kvm->arch.vioapic = NULL;
530 kfree(ioapic);
531 }
532}
533
Gleb Natapoveba02262009-08-24 11:54:25 +0300534int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
535{
536 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
537 if (!ioapic)
538 return -EINVAL;
539
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300540 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300541 memcpy(state, ioapic, sizeof(struct kvm_ioapic_state));
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300542 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300543 return 0;
544}
545
546int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state)
547{
548 struct kvm_ioapic *ioapic = ioapic_irqchip(kvm);
549 if (!ioapic)
550 return -EINVAL;
551
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300552 spin_lock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300553 memcpy(ioapic, state, sizeof(struct kvm_ioapic_state));
Avi Kivity46a929b2009-12-28 14:08:30 +0200554 update_handled_vectors(ioapic);
Yang Zhangc7c9c562013-01-25 10:18:51 +0800555 kvm_ioapic_make_eoibitmap_request(kvm);
Yang Zhang10606912013-04-11 19:21:38 +0800556 kvm_rtc_eoi_tracking_restore_all(ioapic);
Marcelo Tosatti46a47b12010-04-23 14:03:38 -0300557 spin_unlock(&ioapic->lock);
Gleb Natapoveba02262009-08-24 11:54:25 +0300558 return 0;
559}