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

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Samuel Thibault writes ("[Xen-devel] [PATCH] ioemu: drop unused 4MB video 
memory"):
> ioemu: drop unused 4MB video memory
> 
> Since we only emulate the cirrus VGA video card which is only able to
> expose 4MB video memory, we don't need more than that.

I see this has gone into xen-unstable and also the new qemu-xen tree[1].

But it would be nice to understand the compatibility properties:
 * Evidently it breaks when tools have this change but qemu-dm
   doesn't.  Is there a way to avoid this being a fatal error ?
 * I think I'm correct to assume that this change is harmless for
   a new qemu-dm and old tools ?
 * What about save/restore ?

Ian.

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