[Xen-devel] Re: [Xen-staging] [xen-unstable] hvm: Remove access to QEMU monitor inVNC server

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Christian Limpach wrote:
> > QEMU 0.9.0 supports redirecting the monitor to a unix socket and 
> > supports reconnecting to the monitor (so that the banner is 
> > shown each 
> > time).
> > When using these options, you can actually execute monitor 
> > commands from 
> > the command line by doing something like:
> > echo help | socat stdin unix:/path/to/socket
> >
> > With these patches (or by moving qemu-dm up to 0.9.0), 
> > someone could add 
> > an xm monitor command that let you execute commands via xm.
> > That, IMHO, would be the best possible solution.
> >     
> I've found that redirecting the monitor using "-monitor pty" works quite
> well since you get access to it using xm console.  That might have been
> broken recently though by the changes to how pty information is written
> to xenstore.
>   
Except if you disconnect from the pty, QEMU is prone to ending up in an 
infinite loop of read() == 0.
> I think it would be better to extend xm console to support additional
> pty's instead of adding a single purpose xm monitor command.
>   
xm console could also be extended to work with domain sockets which do 
not suffer from this problem.
Regards,

Anthony Liguori

>     christian
>   

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