linux-kernel - [PATCH v2 3/6] KVM: x86/mmu: only zap EPT when guest MTRR changes

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Message-Id: <20230509135143.1721-1-yan.y.zhao@intel.com>
Date:   Tue,  9 May 2023 21:51:43 +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,
        Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH v2 3/6] KVM: x86/mmu: only zap EPT when guest MTRR changes

Call new helper kvm_zap_gfn_for_memtype() to skip zap mmu if EPT is not
enabled.

When guest MTRR changes and it's desired to zap TDP entries to remove
stale mappings, only do it when EPT is enabled, because only memory type
of EPT leaf is affected by guest MTRR with noncoherent DMA present.

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 9fac1ec03463..62ebb9978156 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -330,7 +330,7 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
 		var_mtrr_range(&mtrr_state->var_ranges[index], &start, &end);
 	}
 
-	kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
+	kvm_zap_gfn_for_memtype(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
 }
 
 static bool var_mtrr_range_is_valid(struct kvm_mtrr_range *range)
-- 
2.17.1