[PATCH 05/11] hyperv: create SCSI controllers when defining domains
Daniel P. Berrangé
berrange at redhat.com
Fri Jan 8 10:07:28 UTC 2021
On Fri, Jan 08, 2021 at 02:50:25AM -0500, Matt Coleman wrote:
> > On Nov 26, 2020, at 9:42 AM, Daniel P. Berrangé <berrange at redhat.com> wrote:
> > You ought to pass def->controllers[i] into this method and validate
> > as many properties as practical. At very least validate the model
> > and report VIR_ERR_CONFIG_UNSUPPORTED for any you can't emulate.
> Hyper-V's SCSI controllers are paravirtualized ("synthetic" in Hyper-V
> terms). I've been omitting the model setting from my XML files.
> I can think of three options for how to handle this:
> 1. only support VIR_DOMAIN_CONTROLLER_MODEL_SCSI_DEFAULT
> 2. support VIR_DOMAIN_CONTROLLER_MODEL_SCSI_DEFAULT and
> 3. add VIR_DOMAIN_CONTROLLER_MODEL_SCSI_HYPERV and support
> VIR_DOMAIN_CONTROLLER_MODEL_SCSI_DEFAULT, and
> Adding another virDomainControllerModelSCSI seems unnecessary to me
> because Hyper-V doesn't support emulating any SCSI controllers; it only
> has its paravirtualized SCSI functionality.
> Which do you recommend?
IIRC "DEFAULT" is when no model=... is given at all and usually
a driver would expand that into the suitable SCSI controller model
for the guest.
With that in mind I'd suggest (2).
> > Probably ought to reject any info->type which is not
> > VIR_DOMAIN_ADDRESS_TYPE_NONE, since you're not attempting todo
> > any device addressing at this time.
> There are no address settings for Hyper-V SCSI controllers, so this
> will always be the case. I'll report an error if address settings are
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