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authorGleb Natapov <gleb@redhat.com>2013-09-15 11:07:23 +0300
committerGleb Natapov <gleb@redhat.com>2013-09-17 19:09:47 +0300
commit0be9c7a89f75072e091cd079d76194aec8d1fb09 (patch)
tree62a183a54e4a9b3af3753392f3069cefbdb97a8d /arch
parent28b441e24088081c1e213139d1303b451a34a4f4 (diff)
KVM: VMX: set "blocked by NMI" flag if EPT violation happens during IRET from NMI
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/vmx.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 48735936860..a1216de9ffd 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);