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[libvirt] SCSI command passthrough



Hi,

i'm trying to pass through SCSI commands from a guest to a host. Both guest and host are RHEL 6.3. The relevant section in my XML is:

  <devices>
    <disk type='block' device='lun'>
      <driver name='qemu' type='raw' cache='none'/>
      <source dev='/dev/sdb'/>
      <target dev='sdb' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='1' unit='0'/>
    </disk>
    <controller type='scsi' index='0' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
  ...
  </devices>

Commands that are whitelisted by the host kernel come through (e.g. "sg_inq"), but other commands don't (e.g. "sg_persist").

I need sg_persist so i tried making qemu-kvm setuid root. This works.

Is there a better way to allow arbitrary SCSI commands, perferably on a per-VM basis, rather than making qemu setuid root?

Regards,
Geert


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