[libvirt] [PATCHv9 1/9] blockjob: add qemu capabilities related to block jobs

[Eric Blake]

On 10/23/2012 01:52 PM, Peter Krempa wrote:
> On 10/23/12 04:10, Eric Blake wrote:
>> Upstream qemu 1.3 is adding two new monitor commands, 'drive-mirror'
>> and 'block-job-complete'[1], which can drive live block copy and
>> storage migration.  Additionally, RHEL 6.3 had backported an earlier
>> version of most of the same functionality, but under the names
>> '__com.redhat_drive-mirror' and '__com.redhat_drive-reopen' and with
>> slightly different JSON arguments, which we can support without too
>> much extra effort.
> 
> I know that it's convenient to have this in the upstream release as it
> would remove the need to backport that feature every time. Said this, I
> still don't like the idea dragging this stuff into the upstream code as
> upstream would be responsible for supporting that from the time it went in.
> 
> I am willing to give in on this if somebody else thinks that it would be
> beneficial, but right now I'm not convinced that we want this upstream.

I suppose it's not too hard to split this into two patches - one for
upstream that uses only drive-mirror (and provides but not populates the
feature "drive-reopen",), and one for backporting to RHEL but omitting
from upstream that checks the __com.redhat_* commands.  We'll see if any
one else has a strong opinion one way or the other

For precedence, note that we HAVE pulled other changes upstream for
supporting RHEL 6.3 and CentOS qemu out-of-the-box with upstream
libvirt, such as our change to recognize that if 'qemu-kvm -help'
includes the substring 'libvirt', then it supports usable QMP even
though the version claims to be only 0.12.xyz which normally did not
have usable QMP.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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