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Re: [libvirt] [PATCH 07/10] qemu: Build command line for the new address format



On 02/17/2012 06:18 PM, Osier Yang wrote:
> +        controller_model =
> +            virDomainDiskFindControllerModel(def, disk,
> +                                             VIR_DOMAIN_CONTROLLER_TYPE_SCSI);
> +        if (controller_model == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC) {
> +            virBufferAddLit(&opt, "scsi-disk");
> +            virBufferAsprintf(&opt, ",bus=scsi%d.%d,scsi-id=%d",
> +                              disk->info.addr.drive.controller,
> +                              disk->info.addr.drive.bus,
> +                              disk->info.addr.drive.unit);

Here indeed it is ok to look at the model, for backwards compatibility.
 However, you need to test that the target is zero and print an error if
it is not (for example, "legacy addressing for the 'lsilogic' SCSI
controller does not use the target attribute").

Paolo

> +        } else {
> +            if (!qemuCapsGet(qemuCaps, QEMU_CAPS_SCSI_DISK_CHANNEL)) {
> +                if (disk->info.addr.drive.target > 7) {
> +                    qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> +                                    _("This QEMU doesn't support target "
> +                                      "greater than 7"));
> +                    goto error;
> +                }
> +
> +                if ((disk->info.addr.drive.bus != disk->info.addr.drive.unit) &&
> +                    (disk->info.addr.drive.bus != 0)) {
> +                    qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> +                                    _("This QEMU only supports both bus and "
> +                                      "unit are equal to 0"));
> +                    goto error;
> +                }
> +            }
> +
> +            virBufferAddLit(&opt, "scsi-disk");
> +            virBufferAsprintf(&opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
> +                              disk->info.addr.drive.controller,
> +                              disk->info.addr.drive.bus,
> +                              disk->info.addr.drive.target,
> +                              disk->info.addr.drive.unit);
> +        }


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