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KVM: VMX: set "blocked by NMI" flag if EPT violation happens during IRET from NMI

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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>
This commit is contained in:
Gleb Natapov 2013-09-15 11:07:23 +03:00
parent 28b441e240
commit 0be9c7a89f
1 changed files with 9 additions and 0 deletions
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arch/x86/kvm/vmx.c
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@ -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);