Commit 0d945bd9 authored May 05, 2010 by Joerg Roedel Committed by Avi Kivity May 19, 2010

KVM: SVM: Don't allow nested guest to VMMCALL into host



This patch disables the possibility for a l2-guest to do a
VMMCALL directly into the host. This would happen if the
l1-hypervisor doesn't intercept VMMCALL and the l2-guest
executes this instruction.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent 3f0fd292

arch/x86/kvm/svm.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -2036,6 +2036,9 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm)
		svm->vmcb->control.intercept_cr_write &= ~INTERCEPT_CR8_MASK;
		}

		/* We don't want to see VMMCALLs from a nested guest */
		svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMMCALL);

		/*
		* We don't want a nested guest to be more powerful than the guest, so
		* all intercepts are ORed