Re: [Qemu-devel] [PATCH] Migration via unix sockets.

[Avi Kivity <avi@redhat.com>]

On 08/11/2009 12:15 PM, Chris Lalancette wrote:
> A possible implementation of that is attached.  I have to say, though, that it
> is way more clumsy to use than the unix implementation I posted earlier.  On the
> outgoing side, you have to use the "getfd" monitor command to pass the fd using
> SCM_RIGHTS, then you have to issue another monitor command to start the migration:
>
> (qemu) getfd migration # passes opened fd via SCM_RIGHTS
> (qemu) migrate -d fd:migration
>    

That doesn't seem so bad, especially if you're a program.

> On the incoming side, you have to pass the fd via the command-line.  That means
> that you have to first arrange for it not to be closed on exec, and it also
> means that qemu is now depending on the external program to correctly set up the
> incoming socket so that qemu can just do the accept() on it.
>
>    

I'd like to see a qemu monitor incoming migration command.

> None of these problems are insurmountable, but they do make it cumbersome to use
> in general, and very difficult to use from the command-line.
>    

These are intended for qemu control programs, not humans.

> The other option is that I've misunderstood your intent, and if that is the
> case, please correct me where I'm wrong :).
>    

No, I think you got it.

-- 
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