Commit d55c9d40 authored Mar 18, 2020 by Paolo Bonzini

KVM: nSVM: check for EFER.SVME=1 before entering guest



EFER is set for L2 using svm_set_efer, which hardcodes EFER_SVME to 1 and hides
an incorrect value for EFER.SVME in the L1 VMCB.  Perform the check manually
to detect invalid guest state.

Reported-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 9401f2e5

arch/x86/kvm/svm.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -3558,6 +3558,9 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)

		static bool nested_vmcb_checks(struct vmcb *vmcb)
		{
		if ((vmcb->save.efer & EFER_SVME) == 0)
		return false;

		if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
		return false;

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