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Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary |
Date: |
Wed, 30 Oct 2013 12:07:55 +0100 |
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
- [Qemu-devel] [patch 0/2] align >4GB guest RAM to a 1GB boundary, in case of 1GB-sized hugetlbfs, Marcelo Tosatti, 2013/10/24
- [Qemu-devel] [patch 1/2] exec: add qemu_get_ram_hpagesize, Marcelo Tosatti, 2013/10/24
- [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/24
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Peter Maydell, 2013/10/24
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Paolo Bonzini, 2013/10/24
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Paolo Bonzini, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Paolo Bonzini, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary,
Gerd Hoffmann <=
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Paolo Bonzini, 2013/10/30
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, igor Mammedov, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/25
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, igor Mammedov, 2013/10/27
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/28
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/28
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Igor Mammedov, 2013/10/29
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/29
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Gleb Natapov, 2013/10/30
- Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary, Marcelo Tosatti, 2013/10/30