Re: [Qemu-devel] [ANNOUNCE][Call-For-Testing] Release 0.12.0-rc1 of QEMU

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Dec 10, 2009 at 10:22:24AM +0100, Gerd Hoffmann wrote:
> On 12/09/09 17:56, Daniel P. Berrange wrote:
> >There's a small bug in SCSI drive hotplug where QEMU is not assigning
> >unique block device names when you leave the name unspecified
> >
> >$ /home/berrange/usr/qemu-0.12/bin/qemu -vnc :1 -monitor stdio -device lsi
> >QEMU 0.11.91 monitor - type 'help' for more information
> >(qemu) drive_add 0:0:4  file=/home/berrange/mcdboot.img,if=scsi
> >OK bus 0, unit 0
> >(qemu) drive_add 0:0:4  file=/home/berrange/mcdboot.img,if=scsi
> >OK bus 0, unit 1
> >(qemu) drive_add 0:0:4  file=/home/berrange/mcdboot.img,if=scsi
> >OK bus 0, unit 2
> >(qemu) drive_add 0:0:4  file=/home/berrange/mcdboot.img,if=scsi
> >OK bus 0, unit 3
> >(qemu) info block
> >ide1-cd0: type=cdrom removable=1 locked=0 [not inserted]
> >floppy0: type=floppy removable=1 locked=0 [not inserted]
> >sd0: type=floppy removable=1 locked=0 [not inserted]
> >scsi0-hd0: type=hd removable=0 file=/home/berrange/mcdboot.img ro=1 
> >drv=raw encrypted=0
> >scsi0-hd0: type=hd removable=0 file=/home/berrange/mcdboot.img ro=1 
> >drv=raw encrypted=0
> >scsi0-hd0: type=hd removable=0 file=/home/berrange/mcdboot.img ro=1 
> >drv=raw encrypted=0
> >scsi0-hd0: type=hd removable=0 file=/home/berrange/mcdboot.img ro=1 
> >drv=raw encrypted=0
> >(qemu)
> >
> >Notice they are all 'scsi0-hd0', instead of scsi0-hd1, scsi0-hd2, etc
> 
> Fix attached.
> 
> Note that the whole auto-naming only works reliable if you limit 
> yourself to a single scsi bus (in any qemu version out there).  I 
> strongly recommend to simply name the drives yourself using id=<name>. 
> Works in 0.12 and IIRC in 0.11 too.

Yes we are going to start explicitly naming all the QEMU devices
that libvirt creates. I just want this fix for existing released
libvirt which doesn't name devices.


Regards,
Daniel
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