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

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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>
This commit is contained in:
Joerg Roedel 2010-05-05 16:04:45 +02:00 committed by Avi Kivity
parent 3f0fd2927b
commit 0d945bd935
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/svm.c
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@ -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