Re: Upstream QEMU based stubdom and rump kernel

[Ian Campbell <ian.campbell@citrix.com>]

On Tue, 2015-03-17 at 15:15 +0000, Anthony PERARD wrote:
> On Tue, Mar 17, 2015 at 02:29:07PM +0000, Wei Liu wrote:
> > I've now successfully built QEMU upstream with rump kernel. However to
> > make it fully functional as a stubdom, there are some missing pieces to
> > be added in.
> > 
> > 1. The ability to access QMP socket (a unix socket) from Dom0. That
> >    will be used to issue command to QEMU.
> 
> The QMP "socket" does not needs to be a unix socket. It can be any of
> those (from qemu --help):
> Character device options:
> -chardev null,id=id[,mux=on|off]

How much flexibility/modularity is there on the qemu side for adding new
chardev types? Could we for example add "-chardev vchan,path=path"
without too much trouble?

> To save a QEMU state (write), we do use a filename. But I guest we could
> expand the QMP command (xen-save-devices-state) to use something else, if
> it's easier.

Like, perhaps, an arbitrary chardev?

Ian.