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Re: [libvirt] [PATCH] qemu: hotplug virtio_scsi over lsilogic when sicsi controller is not present

On Wed, Jul 12, 2017 at 23:13:58 -0400, Liang Yan wrote:
> On 7/12/17 2:49 AM, Peter Krempa wrote:
> > On Tue, Jul 11, 2017 at 21:33:49 -0600, Liang Yan wrote:
> >> It may be better to check virtio-scsi controller first since it is
> >> supported better in qemu level.
> > This is not true for OS support. The old controller usually has drivers
> > shipped with the system, whereas you need to install drivers separately
> > for virtio-scsi.
> That is fair, I only thought limited distro this time, my bad, :)
> We do have some issues recently that attach passthrough lun device could
> work well with virtio-scsi controller but not lsi controller,  we
> thought it may be better to set a specif controller for "attach-disk"
> here, what do you say? Do you think is it necessary to add an extra

You need to do this as a separate step. The attach-disk (and the
virDomainAttachDevice API) add the controller only if necessary.

If you manually add a controller of the correct type beforehand, you
have full control what the type is before.

> parameter or just fine-grain support for "-targetbus" that could support
> specific  type? or another solution that I missed? I would be glad to
> implement it.

I don't think it's necessary. It's only necessary to plug the controller
in before adding the disk if you require the non-default one.

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