[libvirt] [PATCH] Fix migration with QEMU 1.6

[Jiri Denemark]

On Fri, Nov 15, 2013 at 21:38:35 +0900, WhiteWind wrote:
> On Fri, 15 Nov 2013 21:18:08 +0900, Jiri Denemark <jdenemar at redhat.com>  
> wrote:
> 
> > On Fri, Nov 15, 2013 at 20:47:43 +0900, Michael Avdienko wrote:
> >> QEMU 1.6.0 introduced new migration status: setup
> >> Libvirt does not expect such string in QMP and refuses to migrate with  
> >> error
> >> "unexpected migration status in setup"
> >>
> >> This patch fixes it.
> >>
> >> Sorry for previous bad try.
> >> Unfortunately I have seen Serge Hallyn's patch too late.
> >> Now I think it's better to include following code into my patch:
> >>         if (setting_up) {
> >>             priv->job.info.fileTotal = -1;
> >>             priv->job.info.fileRemaining = -1;
> >>             priv->job.info.fileProcessed = 0;
> >
> > I don't think this is needed at all, I'd just keep them all 0.
> >
> > This patch gets my ACK as is but I won't it push yet in case someone
> > provides a good reasoning for initializing the counters to 2^64-1.
> >
> > Jirka
> 
> But my patch does not initialize these fields at all.
> Are these fields initialized here?
> qemuDomainObjPrivatePtr priv = vm->privateData;
> 
> If not, I'm almost sure that I should set them all to 0 explicitly
> when status is QEMU_MONITOR_MIGRATION_STATUS_SETUP

It's initialized at the very beginning of migration by
qemuMigrationJobStart(), which results in the following sequence of
function calls leading to the initialization:
qemuDomainObjBeginAsyncJob, qemuDomainObjBeginJobInternal,
qemuDomainObjResetAsyncJob, memset(&job->info, 0, sizeof(job->info)). I
agree it's pretty hidden :-)

Jirka