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

[Peter Xu <peterx@redhat.com>]

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