On 08/22/2017 06:27 PM, Paolo Bonzini wrote:
> Hi all,
>
Sorry for resurrecting old thread but seems like there was no agreement
reached.
We don't want to expose any paths because the fact that PR helper is a
separate binary that uses a UNIX socket to talk to qemu is a
implementation detail of qemu. Other HVs may have it differently.
However, we want to be able to turn it on/off or not mention it at all
on per-disk basis. So what has been suggested so far is:
<disk type='block' device='disk'>
<source dev='/dev/sda'>
<target dev='sda' bus='scsi'/>
<reservations enable='yes'/>
</disk>
for privileged qemu, then:
<disk type='block' device='disk'>
<source dev='/dev/sda'>
<target dev='sda' bus='scsi'/>
<reservations enable='yes'>
<source type='unix' path='/path/to/a/socket' mode='server'/>
<reservations>
</disk>
for unprivileged qemu, or:
<disk type='block' device='disk'>
<source dev='/dev/sda'>
<target dev='sda' bus='scsi'/>
<reservations enable='no'/>
</disk>
for PR feature turned off (equivalent to leaving it out completely).
Now, my question is, in the first case - how should libvirt chose the
path? Should it be different for each disk/domain? How is the daemon
started in the first place - should libvirt start it? And when should
libvirt kill it?
Michal
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