[libvirt] [PATCH 3/5] qemu: add usb-bot support from disks points of view

[Gerd Hoffmann]

On Mo, 2013-09-02 at 13:57 +0100, Daniel P. Berrange wrote:
> On Mon, Sep 02, 2013 at 05:38:42PM +0800, Guannan Ren wrote:
> > usb-bot only supports 16 luns(0~15) and they must be contiguous,
> > (using lun 0 and 2 without 1 doesn't work). In this case qemu
> > doesn't throw an error, we can not find the lun 2 in guests. So
> > Adding a checking function in libvirt to prevent from this case.
> 
> Hmm, this seems like a problematic restriction.

It's how the hardware works.

> How does this work if we start off a guest with 3 disks
> attached to the usb-bot SCSI controller. Then hot-unplug
> the 2nd disk.

You can't hotplug individual luns anyway.

cheers,
  Gerd