Re: [PATCH v3 2/2] sev: update sev-inject-launch-secret to make gpa optional

["Daniel P. Berrangé" <berrange@redhat.com>]

On Fri, Feb 05, 2021 at 11:58:26AM +0100, Paolo Bonzini wrote:
> On 05/02/21 10:51, Daniel P. Berrangé wrote:
> > > +        if (!pc_system_ovmf_table_find(SEV_SECRET_GUID, &data, NULL)) {
> > > +            error_setg(errp, "SEV: no secret area found in OVMF,"
> > > +                       " gpa must be specified.");
> > > +            return;
> > > +        }
> > IIUC, historically QEMU has gone out of its way to avoid creating a
> > direct dependancy on specific firmware implementation details such
> > as this, so this whole approach makes me feel really uneasy.
> 
> The problem here is that this secret must be measured and therefore cannot
> be extracted by the guest out of fw_cfg.  Note that there's no reason why
> other firmware than OVMF could not adopt the same interface.

I didn't mean to store the secret in fw_cfg. Rather to use fw_cfg as a
way for OVMF to tell QEMU where to store it


Regards,
Daniel
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