Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

From: Michael S. Tsirkin
Date: Tue Feb 07 2012 - 06:10:45 EST

On Tue, Feb 07, 2012 at 10:54:54AM +0100, Paolo Bonzini wrote:
> >Also, lun[1] = sc->device->id means that only 255 SCSI target IDs will be
> >supported. Think about bigger usage scenarios, such as FCP networks with
> >several hundred HBAs in the net. If you want to have the target ID<->HBA
> >mapping the same as on the guest as on the host, then 255 virtual target
> >IDs could be a limit.
> I think you would hit other scalability limitations well before
> that. I plan to give each target its own MSI-X interrupt, but there
> is no infinite supplies of those either.

virtio-pci generally lets guests share MSI-X vectors between queues,
why not allow this here?

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