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

[Michael S. Tsirkin]

On Thu, Nov 18, 2010 at 09:22:02AM +0100, Gerd Hoffmann wrote:
> On 11/18/10 09:09, Gleb Natapov wrote:
> >On Wed, Nov 17, 2010 at 08:00:08PM +0200, Michael S. Tsirkin wrote:
> >>>>>  If so: does qemu
> >>>>>emulate this correctly?
> >>>>
> >>>>It mostly does.
> >>>
> >>>I doubt it actually enables/disables the legacy vga ports.
> >>
> >>I'll check when I have the time. We can fix it if it doesn't,
> >>
> >So many guests (all of them?) just assume that vga ports and
> >framebuffer is there. So what "fixing" this will buy us?
> 
> Nothing?
> 
> Certainly not for the qemu standard vga.  The only way for guests is
> to drive that one is via legacy vga ports and vesa vga bios.
> Hotplug is never ever going to work here.
> Also the vga memory window @ 0xa0000 with the piix chipset
> interactions is good for some extra fun ...
> 
> cirrus might be fixable to be hotpluggable.  It also can be
> programmed via mmio bar instead of legacy vga ports, so having two
> cirrus cards in one system might be possible to get work.  I doubt
> it is worth the trouble though.

We will need to fix this for proper pci memory management, anyway.

> I still think that vga cards should simply be flagged to be not
> hot-pluggable.
> 
> cheers,
>   Gerd

Send a patch.

-- 
MST