Re: [Xen-devel] [PATCH RFC] Live migration for VMs with QEMU backed local storage

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, Jun 29, 2017 at 02:56:55PM +0100, Wei Liu wrote:
> On Thu, Jun 29, 2017 at 09:33:07AM -0400, Bruno Alvisio wrote:
> > Thanks Wei. Currently it is started after the memory is streamed from
> > source to destination (for migration) and the booting functions are
> > completed.I was going to ask to the list if there is a specific reason the
> > QEMU process needs to be started at that point.
> 
> I _think_ it is because we don't want QEMU to touch guest memory / state
> too early. Note I haven't checked the code. Do ask on the list if you
> aren't sure.

I would have thought that's because you need the QEMU state, and
that's not saved until the guest on the other end is paused (ie:
rather at the end of the memory copy).

Roger

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