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Commit f78978aa authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
Browse files

KVM: MMU: only update unsync page in invlpg path 



Only unsync pages need updated at invlpg time since other shadow
pages are write-protected

Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e02aa901

arch/x86/kvm/paging_tmpl.h

+6 −2
Original line number Diff line number Diff line
@@ -461,6 +461,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, 
static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)

{

	struct kvm_shadow_walk_iterator iterator;

	struct kvm_mmu_page *sp;

	gpa_t pte_gpa = -1;

	int level;

	u64 *sptep;
@@ -472,10 +473,13 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) 
		level = iterator.level;

		sptep = iterator.sptep;



		sp = page_header(__pa(sptep));

		if (is_last_spte(*sptep, level)) {

			struct kvm_mmu_page *sp = page_header(__pa(sptep));

			int offset, shift;



			if (!sp->unsync)

				break;



			shift = PAGE_SHIFT -

				  (PT_LEVEL_BITS - PT64_LEVEL_BITS) * level;

			offset = sp->role.quadrant << shift;
@@ -493,7 +497,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) 
			break;

		}



		if (!is_shadow_present_pte(*sptep))

		if (!is_shadow_present_pte(*sptep) || !sp->unsync_children)

			break;

	}