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[WIP,v2,08/14] KVM: x86: Implement memory fault exit for FNAME(fetch)

Message ID 20230315021738.1151386-9-amoorthy@google.com (mailing list archive)
State New, archived
Headers show
Series Avoiding slow get-user-pages via memory fault exit | expand

Commit Message

Anish Moorthy March 15, 2023, 2:17 a.m. UTC 
---
 arch/x86/kvm/mmu/paging_tmpl.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 57f0b75c80f9d..ed996dccc03bf 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -717,7 +717,9 @@  static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 	}
 
 	if (WARN_ON_ONCE(it.level != fault->goal_level))
-		return -EFAULT;
+		return kvm_memfault_exit_or_efault(
+			vcpu, fault->gfn * PAGE_SIZE, KVM_PAGES_PER_HPAGE(fault->goal_level),
+			KVM_MEMFAULT_REASON_UNKNOWN);
 
 	ret = mmu_set_spte(vcpu, fault->slot, it.sptep, gw->pte_access,
 			   base_gfn, fault->pfn, fault);