[5/5] KVM: SVM: Don't allow nested guest to VMMCALL into host

Commit Message

Joerg Roedel May 5, 2010, 2:04 p.m. UTC

None

Patch

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bc087c7..2e9b57a 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -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