Re: [Qemu-devel] [PATCH v12 24/28] sev/i386: add migration blocker

[Paolo Bonzini]

On 13/03/2018 12:28, Brijesh Singh wrote:
> 
> 
> On 3/13/18 4:33 AM, Paolo Bonzini wrote:
>> On 08/03/2018 13:48, Brijesh Singh wrote:
>>>      sev_set_guest_state(SEV_STATE_RUNNING);
>>> +
>>> +    /* add migration blocker */
>>> +    error_setg(&sev_mig_blocker,
>>> +               "SEV: Migration is not implemented");
>>> +    ret = migrate_add_blocker(sev_mig_blocker, &local_err);
>>> +    if (local_err) {
>>> +        error_report_err(local_err);
>>> +        error_free(sev_mig_blocker);
>>> +        exit(1);
>>> +    }
>>>  }
>> I think this should be in sev_guest_init instead?  Does migration
>> transfer the measurement, or is it lost forever?  Not a blocker though.
> 
> The launch measurement does not get transferred during the migration.
> During migration we get totally different measurement which is wrapped
> with transport key etc and that need to send to destination. IIRC, in my
> first attempt I was adding this blocker in sev_guest_init() but
> migration_add_blocker() was failing because  sev_guest_init() is called
> before the migration_object_init().

I see, thanks.  I'm not going to touch this part anyway. :)

We can fix it during the freeze period.

Paolo