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KVM: x86/mmu: Zap SPTEs when CR0.CD is toggled iff guest MTRRs are honored

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Zap SPTEs when CR0.CD is toggled if and only if KVM's MMU is honoring
guest MTRRs, which is the only time that KVM incorporates the guest's
CR0.CD into the final memtype.

Suggested-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://lore.kernel.org/r/20230714065122.20315-1-yan.y.zhao@intel.com
[sean: rephrase shortlog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yan Zhao 2023-07-14 14:51:22 +08:00 committed by Sean Christopherson
parent 1affe455d6
commit 7a18c7c2b6
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/x86.c
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@ -962,7 +962,7 @@ void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned lon
kvm_mmu_reset_context(vcpu);
if (((cr0 ^ old_cr0) & X86_CR0_CD) &&
kvm_arch_has_noncoherent_dma(vcpu->kvm) &&
kvm_mmu_honors_guest_mtrrs(vcpu->kvm) &&
!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL);
}