Re: [Xen-devel] [PATCH] ioemu: drop unused 4MB video memory

["Trolle Selander" <trolle.selander@xxxxxxxxx>]

I believe we have this disabled currently, but there is code in upstream qemu to support higher resolutions that actually make use of more memory through stdvga + VBE bios exensions. It seems a bit counterproductive to put in a lot of work to trim this down to 4 megs now if we're eventually going to support the stdvga + VBE combo for higher resolutions. Or is this 4/8 meg allocation stricly for cirrus, and stdvga mem allocation entirely separate?

/ Trolle

On Mon, Jul 14, 2008 at 12:09 PM, Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> wrote:

Samuel Thibault, le Mon 14 Jul 2008 11:49:33 +0100, a écrit :

> Keir Fraser, le Mon 14 Jul 2008 11:42:35 +0100, a écrit :
> > On 14/7/08 11:40, "Samuel Thibault" <samuel.thibault@xxxxxxxxxxxxx> wrote:
> >
> > >>  * What about save/restore ?
> > >
> > > Ah, right, we need a compatibility version for that, I'll work on it.
> >
> > What's the compatibility problem? Is VGA_RAM_SIZE baked into the qemu save
> > image for some reason?
>
> The video memory is currently written by qemu yes.

Actually, the problem is also that everything (including qemu's dirty
bitmap) gets initialized to 4MB before the load, and it'd be clumsy to
plumb a reallocation.  Bummer.  It'd be simpler to just go expense these
4MB.

Samuel

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