linux-kernel - [PATCH v2 2/6] KVM: MMU: don't drop spte if overwrite it from W to RO

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Date:	Wed, 17 Nov 2010 12:10:50 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: [PATCH v2 2/6] KVM: MMU: don't drop spte if overwrite it from W to
 RO

We just need flush tlb if overwrite a writable spte with a read-only
one.

And we should move this operation to set_spte() for sync_page path

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/mmu.c |   20 +++++++++-----------
 1 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e008ae7..9bad960 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1966,7 +1966,7 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 		    gfn_t gfn, pfn_t pfn, bool speculative,
 		    bool can_unsync, bool reset_host_protection)
 {
-	u64 spte;
+	u64 spte, entry = *sptep;
 	int ret = 0;
 
 	/*
@@ -2039,6 +2039,14 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 
 set_pte:
 	update_spte(sptep, spte);
+	/*
+	 * If we overwrite a writable spte with a read-only one we
+	 * should flush remote TLBs. Otherwise rmap_write_protect
+	 * will find a read-only spte, even though the writable spte
+	 * might be cached on a CPU's TLB.
+	 */
+	if (is_writable_pte(entry) && !is_writable_pte(*sptep))
+		kvm_flush_remote_tlbs(vcpu->kvm);
 done:
 	return ret;
 }
@@ -2077,16 +2085,6 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 				 spte_to_pfn(*sptep), pfn);
 			drop_spte(vcpu->kvm, sptep, shadow_trap_nonpresent_pte);
 			kvm_flush_remote_tlbs(vcpu->kvm);
-		/*
-		 * If we overwrite a writable spte with a read-only one,
-		 * drop it and flush remote TLBs. Otherwise rmap_write_protect
-		 * will find a read-only spte, even though the writable spte
-		 * might be cached on a CPU's TLB.
-		 */
-		} else if (is_writable_pte(*sptep) &&
-			  (!(pte_access & ACC_WRITE_MASK) || !dirty)) {
-			drop_spte(vcpu->kvm, sptep, shadow_trap_nonpresent_pte);
-			kvm_flush_remote_tlbs(vcpu->kvm);
 		} else
 			was_rmapped = 1;
 	}
-- 
1.7.0.4

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