Re: [PATCH] kvm/sev: make SEV/SEV-ES asids configurable

José Pekkarinen
2023-10-10T12:36:02Z

On 2023-10-10 14:40, Paolo Bonzini wrote:
> On 10/10/23 13:35, Greg KH wrote:
>> On Tue, Oct 10, 2023 at 01:04:39PM +0300, José Pekkarinen wrote:
>>> There are bioses that doesn't allow to configure the
>>> number of asids allocated for SEV/SEV-ES, for those
>>> cases, the default behaviour allocates all the asids
>>> for SEV, leaving no room for SEV-ES to have some fun.
>
> In addition to what Greg pointed out (and there are many more cases
> that have to be checked for errors, including possible overflows), why
> is it correct to just ignore what's in CPUID?

I'll check if I can use cpuid info to improve this
for v2, I just noticed my cpu advertises sev_es but
the kernel doesn't activate it despite of the kvm_amd
parameter being set, so I tried to fix it this way, but
any comments or ideas for improvement are welcomed.

Thanks!

José.