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Re: [libvirt] SCSI command passthrough



On 09/06/2012 07:51 PM, Geert Jansen wrote:
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?

There is Paolo's suggestion to add cgroup filtering for sg_io:
http://lwn.net/Articles/501742/

But it might had scared people as it got no response. Paolo, would you give it another shot?

Cheers,
Dor


Regards,
Geert

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