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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