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Re: [Qemu-devel] [PATCH] all vga: refuse hotplugging.

From: Stefano Stabellini
Subject: Re: [Qemu-devel] [PATCH] all vga: refuse hotplugging.
Date: Wed, 26 May 2010 14:18:01 +0100
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

On Wed, 26 May 2010, Gerd Hoffmann wrote:
>    Hi,
> >> Yes.  Assuming the virtual hardware in question can actually act as
> >> secondary, i.e. is fully programmable without the legacy vga ports.  The
> >> standard vga can't.  The cirrus looks doable, at least you can access
> >> the vga ports using the mmio bar.
> >
> > I see, good point.
> >
> > I guess the right fix here would be to return -1 in the stdvga case but
> > continue in the cirrus case and avoid registering the vga ioports when
> > used as secondary adapter.
> Except that this most likely is a non-trivial effort as we have to find 
> and test sane ways to handle multiple guest displays.
> I think having two gfx screens mapped to two qemu consoles, then be able 
> to switch between them via Ctrl-Alt-<nr> (like you switch today to text 
> consoles) could be doable without too much effort.  Question is how 
> useful this would be as you can't see your two screens at the same time.

Actually I was thinking of registering multiple graphic consoles, each
of them could be rendered by a different frontend (sdl/vnc)
independently. We would have multiple DisplayStates for that.

> With qxl+spice the spice client will open a new window for the secondary 
> display.  With vnc+sdl you'll see the primary display only.
So you are doing exactly what I wrote above, right?

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