Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary

[Gerd Hoffmann]

On Fr, 2013-10-25 at 23:53 +0100, Paolo Bonzini wrote:
> Il 25/10/2013 20:50, Marcelo Tosatti ha scritto:
> > On Fri, Oct 25, 2013 at 09:52:34AM +0100, Paolo Bonzini wrote:
> >> Because offsets are zero, and lengths match the RAM block lengths, you
> >> do not need any complication with aliasing.  This still has to be done
> >> only for new machine types.
> > 
> > Not possible because you just wasted holesize bytes (if number of
> > additional bytes due to huge page alignment is smaller than holesize, a
> > new hugepage is required, which is not acceptable).
> 
> Ok.  Thanks for explaining---the patch seems good with the proper
> compatibility option in the machine type.  Please run the
> guest_memory_dump_analysis test in autotest too.

As the whole thing must depend on machine type anyway for live migration
compatibility we can also simply change the memory split, i.e. map 2GB
(-M q35) or 3GB (-M pc) below 4G instead of the odd sizes (2.75 / 3.5)
we have now.

cheers,
  Gerd