linux-kernel - [PATCH v4 04/12] KVM: x86/mmu: Use KVM honors guest MTRRs helper when update mtrr

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Date:   Fri, 14 Jul 2023 14:51:56 +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,
        yuan.yao@...ux.intel.com, Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH v4 04/12] KVM: x86/mmu: Use KVM honors guest MTRRs helper when update mtrr

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@...el.com>
Suggested-by: Sean Christopherson <seanjc@...gle.com>
Cc: Kai Huang <kai.huang@...el.com>
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
---
 arch/x86/kvm/mtrr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 3eb6e7f47e96..a67c28a56417 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -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)
-- 
2.17.1