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Re: [libvirt] [PATCH v2] qemu: don't use deprecated -no-kvm-pit-reinjection

On 07/12/2013 10:00 AM, Eric Blake wrote:
>> That shouldn't happen I think. For any runing guest, we have recorded
>> the original capabilities in the domain status XML file. So any caps
>> we detect against QEMU binaries upon restart will only impact newly
>> started guests.
> I seem to recall difficulties in the past, such as when developing on a
> RHEL machine, where the upstream and the downstream list of cap bits are
> different, and where restarting upstream libvirtd had problems with
> domains already started by downstream libvirtd.  I'd feel better if this
> were explicitly tested (easy enough to do - build libvirtd without this
> patch, start a domain, rebuild libvirtd with the patch, restart
> libvirtd, and see if virsh can still control the domain).

Or maybe the difficulty I'm recalling is the case of _unknown_ cap bits.
 You may be right that a known, but differently-set bit, behaves nicer
than parsing the XML with a bit that is completely unknown.

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

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