On 01/14/2014 08:13 PM, Gao Yongwei wrote: >> >> >>> >>> So, if I'm not mistaken, looks like the only way to test for the support >> in QEMU is to actually >>> request a snapshot and see what happens. >>> Is this right? >> >> Unfortunately true for the moment. >> > Hi, does this command can help with you? > virsh qemu-monitor-command vmname --hmp 'help' | grep snapshot_blkdev This would work for current versions of qemu, but may not work in the future (as HMP does not guarantee stable output) - parsing QMP output would be more reliable. Furthermore, the 'qemu-monitor-command' is intentionally unsupported, although this particular use is safe because it doesn't change guest state behind libvirt's back. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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