KVM: x86/mmu: Skip calling mmu->sync_spte() when the spte is 0

[linux-2.6-microblaze.git] / arch / x86 / kvm / mmu / paging_tmpl.h

diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 8ef67f7..03a9577 100644 (file)
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -892,7 +892,7 @@ static int FNAME(sync_spte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, int
        gpa_t pte_gpa;
        gfn_t gfn;
 
-       if (!sp->spt[i])
+       if (WARN_ON_ONCE(!sp->spt[i]))
                return 0;
 
        first_pte_gpa = FNAME(get_level1_sp_gpa)(sp);