Re: [Qemu-devel] Re: virtio-serial: An interface for host-guest communication

[Daniel P. Berrange]

On Mon, Jul 27, 2009 at 03:22:54PM -0500, Anthony Liguori wrote:
> Amit Shah wrote:
> >Hello all,
> >
> >This are the latest version of the patches.
> >
> >Lots of things have changed since the last submission. A few of
> >which I remember:
> >- VNC copy / paste works* (* conditions apply)
> >  - client vnc copies get propagated to guest port 3 (/dev/vmch3)
> >  - guest writes to port 3 (/dev/vmch3) go straight to client's clipboard
> >  
> 
> Why 3?
> 
> Where's the guest application that drives the copy/paste?
> 
> I expect the first problem you'll run into is that copy/paste daemon has 
> to run as an unprivileged user but /dev/vmch3 is going to be owned by 
> root.  You could set udev rules for /dev/vmch3 but that's pretty 
> terrible IMHO.

I don't think that's not too bad, for example, with fast-user-switching 
between multiple X servers and/or text consoles, there's already support
code that deals with chown'ing things like /dev/snd/* devices to match 
the active console session. Doing the same with the /dev/vmch3 device so
that it is only ever accessible to the current logged in user actually
fits in to that scheme quite well.

Daniel
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