Commit 7a18c7c2 authored by Yan Zhao's avatar Yan Zhao Committed by Sean Christopherson
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KVM: x86/mmu: Zap SPTEs when CR0.CD is toggled iff guest MTRRs are honored 



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: default avatarChao Gao <chao.gao@intel.com>
Signed-off-by: default avatarYan 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: default avatarSean Christopherson <seanjc@google.com>
parent 1affe455

arch/x86/kvm/x86.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

}