linux-kernel - [PATCH v3 03/11] KVM: x86/mmu: Use KVM honors guest MTRRs helper when CR0.CD toggles

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Date:   Fri, 16 Jun 2023 10:35:24 +0800
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     pbonzini@...hat.com, seanjc@...gle.com, chao.gao@...el.com,
        kai.huang@...el.com, robert.hoo.linux@...il.com,
        Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH v3 03/11] KVM: x86/mmu: Use KVM honors guest MTRRs helper when CR0.CD toggles

Call helper to check if guest MTRRs are honored by KVM MMU before zapping,
as values of guest CR0.CD will only affect memory types of KVM TDP when
guest MTRRs are honored.

Suggested-by: Chao Gao <chao.gao@...el.com>
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9e7186864542..6693daeb5686 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -942,7 +942,7 @@ 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);
 }
-- 
2.17.1