From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
KVM list <kvm@vger.kernel.org>
Subject: [PATCH 1/3] KVM: MMU: split kvm_sync_page() function
Date: Sat, 15 May 2010 18:51:24 +0800 [thread overview]
Message-ID: <4BEE7CAC.5020603@cn.fujitsu.com> (raw)
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@cn.fujitsu.com>
---
arch/x86/kvm/mmu.c | 29 +++++++++++++++++++++++++----
1 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 48ed42e..549255d 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1198,16 +1198,20 @@ 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(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
+ bool clear_unsync)
{
if (sp->role.cr4_pae != !!is_pae(vcpu)) {
kvm_mmu_zap_page(vcpu->kvm, sp);
return 1;
}
- if (rmap_write_protect(vcpu->kvm, sp->gfn))
- kvm_flush_remote_tlbs(vcpu->kvm);
- kvm_unlink_unsync_page(vcpu->kvm, sp);
+ if (clear_unsync) {
+ if (rmap_write_protect(vcpu->kvm, sp->gfn))
+ kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_unlink_unsync_page(vcpu->kvm, sp);
+ }
+
if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
kvm_mmu_zap_page(vcpu->kvm, sp);
return 1;
@@ -1217,6 +1221,23 @@ static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
return 0;
}
+static void mmu_convert_notrap(struct kvm_mmu_page *sp);
+static int kvm_sync_page_transient(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp)
+{
+ int ret;
+
+ ret = __kvm_sync_page(vcpu, sp, false);
+ if (!ret)
+ mmu_convert_notrap(sp);
+ return ret;
+}
+
+static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+{
+ return __kvm_sync_page(vcpu, sp, true);
+}
+
struct mmu_page_path {
struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1];
unsigned int idx[PT64_ROOT_LEVEL-1];
--
1.6.1.2
next reply other threads:[~2010-05-15 10:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-15 10:51 Xiao Guangrong [this message]
2010-05-15 10:52 ` [PATCH 2/3] KVM: MMU: don't write-protect if have new mapping to unsync page Xiao Guangrong
2010-05-15 10:53 ` [PATCH 3/3] KVM: MMU: only update unsync page in invlpg path Xiao Guangrong
2010-05-19 16:19 ` [PATCH 1/3] KVM: MMU: split kvm_sync_page() function Avi Kivity
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