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[WIP,v2,05/14] KVM: x86: Implement memory fault exit for direct_map

Message ID 20230315021738.1151386-6-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 
TODO: The return value of this function is ignored in
kvm_arch_async_page_ready. Make sure that the side effects of
memory_fault_exit_or_efault are acceptable there.
---
 arch/x86/kvm/mmu/mmu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c8ebe542c565f..0b02e2c360c08 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3193,7 +3193,10 @@  static int direct_map(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, ACC_ALL,
 			   base_gfn, fault->pfn, fault);