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Commit 9a43c5d9 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: MMU: cleanup __kvm_sync_page and its callers 



Calling kvm_unlink_unsync_page in the middle of __kvm_sync_page makes
things unnecessarily tricky.  If kvm_mmu_prepare_zap_page is called,
it will call kvm_unlink_unsync_page too.  So kvm_unlink_unsync_page can
be called just as well at the beginning or the end of __kvm_sync_page...
which means that we might do it in kvm_sync_page too and remove the
parameter.

kvm_sync_page ends up being the same code that kvm_sync_pages used
to have before the previous patch.

Reviewed-by: default avatarTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent df748f86

arch/x86/kvm/mmu.c

+4 −6
Original line number Diff line number Diff line
@@ -1917,16 +1917,13 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, 


/* @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)

			   struct list_head *invalid_list)

{

	if (sp->role.cr4_pae != !!is_pae(vcpu)) {

		kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);

		return 1;

	}



	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);

		return 1;
@@ -1956,7 +1953,7 @@ static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, 
	LIST_HEAD(invalid_list);

	int ret;



	ret = __kvm_sync_page(vcpu, sp, &invalid_list, false);

	ret = __kvm_sync_page(vcpu, sp, &invalid_list);

	kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, !ret);



	return ret;
@@ -1972,7 +1969,8 @@ static void mmu_audit_disable(void) { } 
static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,

			 struct list_head *invalid_list)

{

	return __kvm_sync_page(vcpu, sp, invalid_list, true);

	kvm_unlink_unsync_page(vcpu->kvm, sp);

	return __kvm_sync_page(vcpu, sp, invalid_list);

}



/* @gfn should be write-protected at the call site */