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Commit f918b443 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
Browse files

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: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent cb83cad2

arch/x86/kvm/mmu.c

+2 −4
Original line number Diff line number Diff line
@@ -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);