* [PATCH] KVM: VMX: set "blocked by NMI" flag if EPT violation happens during IRET from NMI
@ 2013-09-15 8:07 Gleb Natapov
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From: Gleb Natapov @ 2013-09-15 8:07 UTC (permalink / raw)
To: kvm; +Cc: pbonzini
Set "blocked by NMI" flag if EPT violation happens during IRET from NMI
otherwise NMI can be called recursively causing stack corruption.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1f1da43..fa1984c 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5339,6 +5339,15 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
return 0;
}
+ /*
+ * EPT violation happened while executing iret from NMI,
+ * "blocked by NMI" bit has to be set before next VM entry.
+ * There are errata that may cause this bit to not be set:
+ * AAK134, BY25.
+ */
+ if (exit_qualification & INTR_INFO_UNBLOCK_NMI)
+ vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);
+
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
trace_kvm_page_fault(gpa, exit_qualification);
--
Gleb.
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2013-09-15 8:07 [PATCH] KVM: VMX: set "blocked by NMI" flag if EPT violation happens during IRET from NMI Gleb Natapov
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