linux-kernel - [PATCH v2 5/10] KVM MMU: split kvm_sync

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Message-ID: <4BD3E89C.8090307@cn.fujitsu.com>
Date:	Sun, 25 Apr 2010 15:00:44 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 5/10] KVM MMU: split kvm_sync_page() function

Split kvm_sync_page() into kvm_sync_page() and kvm_sync_page_transient()
to clarify the code address Avi's suggestion

kvm_sync_page_transient() function only update shadow page but not mark
it sync and not write protect sp->gfn. it will be used by later patch

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 arch/x86/kvm/mmu.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index abf8bd4..60a91c6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1196,6 +1196,23 @@ static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp)
 
 static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp);
 
+static int kvm_sync_page_transient(struct kvm_vcpu *vcpu,
+				   struct kvm_mmu_page *sp)
+{
+	if (sp->role.cr4_pae != !!is_pae(vcpu)) {
+		kvm_mmu_zap_page(vcpu->kvm, sp);
+		return 1;
+	}
+
+	if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
+		kvm_mmu_zap_page(vcpu->kvm, sp);
+		return 1;
+	}
+
+	kvm_mmu_flush_tlb(vcpu);
+	return 0;
+}
+
 static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
 {
 	if (sp->role.cr4_pae != !!is_pae(vcpu)) {
-- 
1.6.1.2


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