KVM: nVMX: mask unrestricted_guest if disabled on L0
commit 0790ec17 upstream. If EPT was enabled, unrestricted_guest was allowed in L1 regardless of L0. L1 triple faulted when running L2 guest that required emulation. Another side effect was 'WARN_ON_ONCE(vmx->nested.nested_run_pending)' in L0's dmesg: WARNING: CPU: 0 PID: 0 at arch/x86/kvm/vmx.c:9190 nested_vmx_vmexit+0x96e/0xb00 [kvm_intel] () Prevent this scenario by masking SECONDARY_EXEC_UNRESTRICTED_GUEST when the host doesn't have it enabled. Fixes: 78051e3b ("KVM: nVMX: Disable unrestricted mode if ept=0") Tested-By: Kashyap Chamarthy <kchamart@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> [ luis: backported to 3.16: - use nested_vmx_secondary_ctls_high instead of vmx->nested.nested_vmx_secondary_ctls_high ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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