On Thu, Oct 13, 2022 at 01:23:40AM +0530, manish.mishra wrote:
> Hi Everyone,
> Hope everyone is doing great. I have seen some live migration issues with 
> qemu-4.2 when using multiFD. Signature of issue is something like this.
> 2022-10-01T09:57:53.972864Z qemu-kvm: failed to receive packet via multifd 
> channel 0: multifd: received packet magic 5145564d expected 11223344
> 
> Basically default live migration channel packet is received on multiFD 
> channel. I see a older patch explaining potential reason for this behavior.
> https://lists.gnu.org/archive/html/qemu-devel/2019-10/msg05920.html
> > [PATCH 3/3] migration/multifd: fix potential wrong acception order of IO.
> 
> But i see this patch was not merged. By looking at qemu master code, i
> could not find any other patch too which can handle this issue. So as
> per my understanding this is still a potential issue even in qemu
> master. I mainly wanted to check why this patch was dropped?

See my repllies in that message - it broke compatilibity of data on
the wire, meaning old QEMU can't talk to new QEMU and vica-verca.

We need a fix for this issue, but it needs to take into account
wire compatibility.

With regards,
Daniel
-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|


Reply via email to