Commit 4f233371 authored Apr 09, 2020 by Krish Sadhukhan Committed by Paolo Bonzini Apr 21, 2020

KVM: nSVM: Check for CR0.CD and CR0.NW on VMRUN of nested guests



According to section "Canonicalization and Consistency Checks" in APM vol. 2,
the following guest state combination is illegal:

	"CR0.CD is zero and CR0.NW is set"

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <20200409205035.16830-2-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent a9ab13ff

arch/x86/kvm/svm/nested.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -207,6 +207,10 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
		if ((vmcb->save.efer & EFER_SVME) == 0)
		return false;

		if (((vmcb->save.cr0 & X86_CR0_CD) == 0) &&
		(vmcb->save.cr0 & X86_CR0_NW))
		return false;

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

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