[libvirt] [PATCH 1/2] qemu: add vhost-scsi-pci definitions

Daniel P. Berrange berrange at redhat.com
Fri Jul 25 08:53:27 UTC 2014


On Thu, Jul 24, 2014 at 11:18:14PM -0700, Nicholas A. Bellinger wrote:
> On Thu, 2014-07-24 at 10:53 +0100, Daniel P. Berrange wrote:
> > On Thu, Jul 24, 2014 at 08:25:59AM +0200, Paolo Bonzini wrote:
> > > Il 24/07/2014 05:24, Nicholas A. Bellinger ha scritto:
> > > > From: Mike Perez <thingee at gmail.com>
> > > > 
> > > > This patch adds the necessary definitions to support vhost-scsi-pci and
> > > > VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VHOST_SCSI in QEMU >= v1.5.x code.
> > > > 
> > > > This includes:
> > > > 
> > > >   - Add QEMU_CAPS_VHOST_SCSI
> > > >   - Add virDomainControllerDef->wwpn pointer for the vhost-scsi wwpn.
> > > >   - Setting the new model type in qemuSetSCSIControllerModel()
> > > >   - Invoking virDomainPCIAddressReserveAddr() for vhost-scsi-pci in
> > > >     qemuAssignDevicePCISlots()
> > > >   - Add the 'wwpn=' device parameter in qemuBuildControllerDevStr()
> > > >   - Add vhost-scsi-pci to >= v1.5.x qemucapabilitiesdata
> > > >   - Add xml2argv and xml2xml tests for cmd_per_lun + max_sectors +
> > > >     num_queues + wwpn.
> > > > 
> > > > Signed-off-by: Mike Perez <thingee at gmail.com>
> > > > Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
> > > 
> > > Configuration still has to go through configfs; I'm not sure how using <disk>
> > > and vhost-scsi together makes sense:
> > > 
> > > +    <disk type='block' device='disk'>
> > > +      <source dev='/dev/HostVG/QEMUGuest1'/>
> > > +      <target dev='sdb' bus='scsi'/>
> > > +      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> > > +    </disk>
> > > +    <controller type='usb' index='0'/>
> > > +    <controller type='scsi' index='0' model='vhost-scsi'>
> > > +      <driver wwpn='naa.60014050a13df4f2'/>
> > > +    </controller>
> > > 
> > > ...
> > > 
> > > +-device vhost-scsi-pci,id=scsi0,wwpn=naa.60014050a13df4f2 \
> > > +-usb \
> > > +-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-scsi0-0-0-0 \
> > > +-device scsi-disk,bus=scsi0.0,channel=0,scsi-id=0,lun=0,\
> > > +drive=drive-scsi0-0-0-0,id=scsi0-0-0-0 \
> > > 
> > > and I'm not sure even how it can work since vhost-scsi-pci doesn't expose
> > > a QEMU SCSI bus.
> > 
> > Indeed, it doesn't seem to actually work. I have a vm where I'm
> > using virtio-scsi, so I changed the model to vhost-scsi and added
> > a random wwpn string (unclear if there's any rules for generating
> > these wwpn strings?).
> > 
> >     <disk type='file' device='disk'>
> >       <driver name='qemu' type='raw'/>
> >       <source file='/var/lib/libvirt/images/data1.img'/>
> >       <target dev='sda' bus='scsi'/>
> >       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> >     </disk>
> >     <disk type='file' device='disk'>
> >       <driver name='qemu' type='raw'/>
> >       <source file='/var/lib/libvirt/images/data2.img'/>
> >       <target dev='sda' bus='scsi'/>
> >       <address type='drive' controller='0' bus='0' target='0' unit='1'/>
> >     </disk>
> >     <disk type='file' device='disk'>
> >       <driver name='qemu' type='raw'/>
> >       <source file='/var/lib/libvirt/images/data3.img'/>
> >       <target dev='sda' bus='scsi'/>
> >       <address type='drive' controller='0' bus='0' target='0' unit='2'/>
> >     </disk>
> >     <controller type='scsi' index='0' model='vhost-scsi'>
> >       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
> >       <driver wwpn='naa.60014050a13df4f2'/>
> >     </controller>
> > 
> > When I try to start the guest it fails to find the SCSI controller
> > 
> >   qemu-system-x86_64: -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,\
> >   lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0: Bus 'scsi0.0' not found
> > 
> 
> Thanks for the comments.
> 
> Dropping the disk virtio-scsi disk sections now.

Huh ? If you don't have the virtio-scsi disk args how are you supposed
to attach the disks to the VM.

Regards,
Daniel
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