[libvirt] hotplug support for "filesystem" devices?
Snyder, Emile
emsnyder at ebay.com
Wed May 18 16:20:15 UTC 2016
Hello all,
I'm a newbie to libvirt, coming to it because I'm trying to understand how to provide the ability to attach/detach network filesystem shares to openstack guest instances in something analogous to the way block devices can be now.
While playing with the existing virtfs/9p support for qemu, I found that I can't use virsh to attach a "filesystem" device while the VM is running. For example, I create a snippet of XML like
<filesystem type='mount' accessmode='mapped'>
<source dir='/tmp/share'/>
<target dir='share_tag'/>
</filesystem>
and then try:
stack at devstack-8366:~/devstack$ virsh list
Id Name State
----------------------------------------------------
3 instance-00000002 running
5 instance-00000004 running
8 instance-00000007 running
stack at devstack-8366:~/devstack$ virsh attach-device 8 share.xml
error: Failed to attach device from share.xml
error: Operation not supported: live attach of device 'filesystem' is not supported
I see that error coming from src/qemu/qemu_driver.c in the qemuDomainAttachDeviceLive function.
Can anyone tell me if this is something that is going to be hard or easy to make possible? Pointers to where I should look in the source, or in qemu? Is anyone working it already?
Any advice at all welcome,
Thanks
-Emile Snyder
More information about the libvir-list
mailing list