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KVM: x86/mmu: clear MMIO cache when unloading the MMU

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For cleanliness, do not leave a stale GVA in the cache after all the roots are
cleared.  In practice, kvm_mmu_load will go through kvm_mmu_sync_roots if
paging is on, and will not use vcpu_match_mmio_gva at all if paging is off.
However, leaving data in the cache might cause bugs in the future.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-02-14 09:13:48 -05:00
parent d2e5f33341
commit 6d58f275e6
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/mmu/mmu.c
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@ -5082,6 +5082,7 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu)
WARN_ON(VALID_PAGE(vcpu->arch.root_mmu.root.hpa));
kvm_mmu_free_roots(kvm, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
WARN_ON(VALID_PAGE(vcpu->arch.guest_mmu.root.hpa));
vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
}
static bool need_remote_flush(u64 old, u64 new)