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KVM: x86/mmu: Zap SPTEs on MTRR update iff guest MTRRs are honored 

When guest MTRRs are updated, zap SPTEs and do zap range calcluation if and
only if KVM's MMU is honoring guest MTRRs, which is the only time that KVM
incorporates the guest's MTRR type into the final memtype.

Suggested-by: Chao Gao <chao.gao@intel.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://lore.kernel.org/r/20230714065156.20375-1-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 14:51:56 +08:00 committed by Sean Christopherson
parent 7a18c7c2b6
commit 9a3768191d
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mtrr.c
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@ -320,7 +320,7 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
gfn_t start, end;
if (!tdp_enabled || !kvm_arch_has_noncoherent_dma(vcpu->kvm))
if (!kvm_mmu_honors_guest_mtrrs(vcpu->kvm))
return;
if (!mtrr_is_enabled(mtrr_state) && msr != MSR_MTRRdefType)