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Commit 0be9c7a8 authored by Gleb Natapov's avatar Gleb Natapov
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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: default avatarGleb Natapov <gleb@redhat.com>
parent 28b441e2

arch/x86/kvm/vmx.c

+9 −0
Original line number Diff line number Diff line
@@ -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);