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Re: [Qemu-devel] [PATCH v12 0/4] support to migrate with IPv6 address

From: Amos Kong
Subject: Re: [Qemu-devel] [PATCH v12 0/4] support to migrate with IPv6 address
Date: Fri, 11 May 2012 14:46:03 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111124 Thunderbird/8.0

On 05/11/2012 02:12 AM, Michael Roth wrote:
> On Thu, May 10, 2012 at 11:29:48AM -0600, Eric Blake wrote:
>> On 05/10/2012 10:27 AM, Amos Kong wrote:
>>> Those patches updated help functions in qemu-socket.c,
>>> and used them in migrate-tcp.c to supporting IPv6 migration.
>>> ---
>>> Amos Kong (4):
>>>       qerror: add five qerror strings
>>>       sockets: change inet_connect() to support nonblock socket
>>>       sockets: use error class to pass listen error
>>>       use inet_listen()/inet_connect() to support ipv6 migration
>> I'm trying to understand the scope of this series, and how it might
>> impact what libvirt needs to support for migration in an IPv6
>> environment.  Is the point of this patch that IPv6 migration was
>> previously not possible, and is now possible using [IP6addr]:port notation?
> Looks like Amos went offline: but yes, in a nutshell.
> addr parsing now relies on qemu-sockets.c:inet_parse(), which has supported
> [ip6addr]:port for a while, as opposed to net.c:parse_host_port(), which
> didn't.


I didn't change qemu monitor cmd interface in this patchset,
and the transport of data is done by qemu, not libvirt.

I guess libvirt only needs to update addr string parse,
for example:

---- GOOD
start a VM:
# qemu-kvm --enable-kvm -boot n -incoming tcp:ipv6alias:16514 -vnc :1
-monitor stdio -name qemu-vm1

try to migrate vm by virsh with addr alias
# virsh migrate libivrt-vm2 tcp:ipv6alias
(connection can establish)

--- FAIL
start a VM:
# qemu-kvm-apply-my-patches --enable-kvm -boot n -incoming
tcp:[2002::3:4]:16514 -vnc :1 -monitor stdio -name qemu-vm1

try to migrate vm by virsh with ipv6 addr:
# virsh migrate libvirt-vm2 tcp:[2002::3:4]
error: invalid argument: could not parse connection URI tcp:[2002::3:4]

Thanks, Amos.

> Additional Error-handling was added to
> qemu-sockets.c:inet_connect()/inet_listen(), along with non-blocking support
> for inet_connect(), to subsume the ad-hoc client/server setup in
> migration-tcp.c


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