commit faaf05b00aecdb347ffd1d763d024394ec0329f8
author Ben Gardon <bgardon@google.com> Wed Oct 14 11:26:47 2020 -0700
committer Paolo Bonzini <pbonzini@redhat.com> Wed Oct 21 18:17:02 2020 -0400
tree 6054d3a1c0128da3113bb8b7250fed3b17385909
parent 9e9eb226b91225fc199bbafc06f3cd70bfce0100

kvm: x86/mmu: Support zapping SPTEs in the TDP MMU

Add functions to zap SPTEs to the TDP MMU. These are needed to tear down
TDP MMU roots properly and implement other MMU functions which require
tearing down mappings. Future patches will add functions to populate the
page tables, but as for this patch there will not be any work for these
functions to do.

Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell
machine. This series introduced no new failures.

This series can be viewed in Gerrit at:
	https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20201014182700.2888246-8-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 9c8f42e..dd15e51 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5371,6 +5371,10 @@ static void kvm_mmu_zap_all_fast(struct kvm *kvm)
 	kvm_reload_remote_mmus(kvm);
 
 	kvm_zap_obsolete_pages(kvm);
+
+	if (kvm->arch.tdp_mmu_enabled)
+		kvm_tdp_mmu_zap_all(kvm);
+
 	spin_unlock(&kvm->mmu_lock);
 }
 
@@ -5411,6 +5415,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
 	struct kvm_memslots *slots;
 	struct kvm_memory_slot *memslot;
 	int i;
+	bool flush;
 
 	spin_lock(&kvm->mmu_lock);
 	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
@@ -5430,6 +5435,12 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
 		}
 	}
 
+	if (kvm->arch.tdp_mmu_enabled) {
+		flush = kvm_tdp_mmu_zap_gfn_range(kvm, gfn_start, gfn_end);
+		if (flush)
+			kvm_flush_remote_tlbs(kvm);
+	}
+
 	spin_unlock(&kvm->mmu_lock);
 }
 
@@ -5596,6 +5607,10 @@ void kvm_mmu_zap_all(struct kvm *kvm)
 	}
 
 	kvm_mmu_commit_zap_page(kvm, &invalid_list);
+
+	if (kvm->arch.tdp_mmu_enabled)
+		kvm_tdp_mmu_zap_all(kvm);
+
 	spin_unlock(&kvm->mmu_lock);
 }