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Subject[PATCH 3/7] KVM: MMU: avoid double write protected in sync page path
The sync page is already write protected in mmu_sync_children(), don't
write protected it again

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
---
arch/x86/kvm/mmu.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 21ab85b..2ffd673 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1216,6 +1216,7 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
if ((sp)->gfn != (gfn) || (sp)->role.direct || \
(sp)->role.invalid) {} else

+/* @sp->gfn should be write-protected at the call site */
static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct list_head *invalid_list, bool clear_unsync)
{
@@ -1224,11 +1225,8 @@ static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
return 1;
}

- if (clear_unsync) {
- if (rmap_write_protect(vcpu->kvm, sp->gfn))
- kvm_flush_remote_tlbs(vcpu->kvm);
+ if (clear_unsync)
kvm_unlink_unsync_page(vcpu->kvm, sp);
- }

if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);
--
1.6.1.2



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