[Qemu-devel] Re: [PATCH] spice: add qxl device

[Gerd Hoffmann]

  Hi,

> > > > Better don't try ...
> > >
> > > Better prevent it then?
> >
> > How can I do that?

Question still stands:  Is there some way to disable hotplug for certain 
pci devices?

> >   How does this work btw?  Only
> > one vga adapter can drive the legacy vga ports, right?  Is there
> > some way to enable/disable this per vga device?
>
> Yes, just disable IO memory.

This is supposed to disable legacy vga ports (0x03c0+) too?

> >   If so: does qemu
> > emulate this correctly?
>
> It mostly does.

I doubt it actually enables/disables the legacy vga ports.

> But the counter wrapping will at least in theory crash qemu,
> this is an even bigger problem than a guest crash.

I can put it a limit at one million hotplugs or so ...

> >   I also don't see the point in plugging a display like
> > mad.
>
> Just to see if you can exploit some memory corruption maybe?

Can the guest do that without the hosts help?
Especially plugging *in* something?

cheers,
  Gerd