Re: [PATCH v9 22/22] s390: doc: detailed specifications for AP virtualization

Halil Pasic
2018-08-22T10:45:14Z

On 08/22/2018 12:13 PM, Harald Freudenberger wrote:
> ... about control domains
>
> Talked with the s390 firmware guys. The convention that the control domain
> mask is a superset of the usage domain mask is only true for 1st level guests.
>
> It is absolutely valid to run a kvm guest with restricted control domain
> mask bitmap in the CRYCB. It is valid to have an empty control domain mask
> and the guest should be able to run crypto CPRBs on the usage domain(s) without
> any problems. However, nobody has tried this.

I did try this ;).

>
> regards
> Harald Freudenberger
>
>