Re: [Qemu-devel] RFC: running the user interface in a thread ...

[Kevin Wolf]

Am 19.01.2016 um 15:14 hat Gerd Hoffmann geschrieben:
>   Hi,
> 
> > That does feel safer, if you can find an efficient way to do the graphics.
> > A lot less code running with the privs of the qemu process.
> 
> That is where it starts to become tricky ...
> 
> On modern linux we can simply use dma-bufs.
> 
> On older linux and generic posix (*bsd etc) we should be able to use
> sysv shared memory.
> 
> As MacOS X is based on BSD I'd expect sysv shared memory is available
> there too.  Possibly we can use something more efficient there, we have
> macos-specific ui code anyway.
> 
> Windows?  Hmm, no idea how to shared memory there.
> 
> We also need a control channel, to manage the shm bufs, to send user
> input (kbd/mouse), to implement some control things (machine menu in gtk
> ui).  One option would be to simply use the monitor for that.  The other
> one is to invent something limited to the stuff actually needed instead
> of handing over a dangerous swiss army knife to the process running the
> UI.  Hmm, maybe a new monitor mode with a limited set of commands would
> do too.

I think you need to offer the full monitor command set anyway because
a UI that is on par with SDL or GTK must provide a monitor interface to
the user.

Kevin