Re: [PATCH v4 00/11] migration: fast snapshot load

Hi Peter,

Thanks for trying it out. I will take care of the disabling migration
in the next version. I have replied to the page size issue in
corresponding mail.

Thank you,
Aadeshveer Singh


On Tue, Aug 11, 2026 at 12:32 AM Peter Xu <[email protected]> wrote:
>
> On Sat, Aug 01, 2026 at 08:06:17AM +0530, Aadeshveer Singh wrote:
> > This series implements a "fast snapshot load" mechanism to
> > significantly reduce the perceived resume time of a VM from a snapshot
> > file.
>
> I gave this one a quick shot, it ran all fine here.  It's a bit of a pity
> that I still almost need to rely on postcopy-blocktime to get some more
> info out of the async load process.. but I think it's still OK.
>
> One other issue I found though, after applying this patch, QEMU will also
> allow me to use QMP/HMP "migrate" (rather than "migrate_incoming") command
> when both postcopy and mapped-ram are enabled, which will ultimately leads
> to an error:
>
> (qemu) info migrate
> Status:                 failed (Unable to read from file: Bad file descriptor)
>
> What we can do is to disable it for qmp_migrate(), e.g.  migrate_prepare()
> can bail out for outgoing migrations of such setup.
>
> Other than that (and the page size issue I raised in the separate email),
> I think it's ready.
>
> Thanks,
>
> --
> Peter Xu
>