diff mbox series

[v3,10/22] KVM: x86: Annotate -EFAULTs from kvm_mmu_page_fault()

Message ID 20230412213510.1220557-11-amoorthy@google.com (mailing list archive)
State New, archived
Headers show
Series Improve scalability of KVM + userfaultfd live migration via annotated memory faults. | expand

Commit Message

Anish Moorthy April 12, 2023, 9:34 p.m. UTC 
Implement KVM_CAP_MEMORY_FAULT_INFO for efaults generated by
kvm_mmu_page_fault().

Signed-off-by: Anish Moorthy <amoorthy@google.com>
---
 arch/x86/kvm/mmu/mmu.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 144c5a01cd778..7391d1f75149d 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5670,6 +5670,9 @@  int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 err
 			return -EIO;
 	}
 
+	if (r == -EFAULT)
+		kvm_populate_efault_info(vcpu, round_down(cr2_or_gpa, PAGE_SIZE),
+								 PAGE_SIZE);
 	if (r < 0)
 		return r;
 	if (r != RET_PF_EMULATE)