Re: 2 CPU Conformance Issue in KVM/x86

Paolo Bonzini
2015-03-09T19:33:14Z

On 09/03/2015 18:08, Avi Kivity wrote:
> Is the issue emulating a higher MAXPHYADDR on the guest than is
> available on the host? I don't think there's any need to support that.

No, indeed. The only problem is that the failure mode is quite horrible
(you get a triple fault, possibly while the guest is running).

If you need that, disable EPT. :)

> Emulating a lower setting on the guest than is available on the host is,
> I think, desirable. Whether it would work depends on the relative
> priority of EPT misconfiguration exits vs. page table permission faults.

Yes, that's doable.

Paolo