[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] IPv6 support for TCP migrations
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] IPv6 support for TCP migrations |
Date: |
Wed, 4 May 2011 11:13:28 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, May 04, 2011 at 09:39:02AM +0100, address@hidden wrote:
> Hi,
>
> Currently migration-tcp.c uses the IPv4-only socket functions, making
> migrations over IPv6 impossible. Following is a tentative patch that switches
> it to use inet_connect() and inet_listen().
>
> However, the patch loses the non-blocking connect() behaviour seen with the
> previous code. I'm not sure how much of an issue this is - if connect() blocks
> here, does it block execution of the VM?
>
> If so, I guess we need a non-blocking form of inet_connect(), or some way of
> replicating the behaviour - it would potentially be needed for my NBD
> reconnection patches too? I can see that a blocking connect() might not be an
> issue while the KVM process is starting up, but could cause problems if we
> try to reconnect while emulation is ongoing.
>
> Thoughts?
FWIW, Juan Quintela also posted a set of patches to add IPv6 support for
migration a few weeks back, but unfortunately they don't appear to have
been merged yet:
http://www.mail-archive.com/address@hidden/msg58954.html
IIUC, Juan's patches don't have the blocking connect() problem you
mention.
Regards,
Daniel
--
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|