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From: Gerd Hoffmann <kraxel@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: aarcange@redhat.com, Marcelo Tosatti <mtosatti@redhat.com>,
	qemu-devel@nongnu.org, gleb@redhat.com,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary
Date: Wed, 30 Oct 2013 12:07:55 +0100	[thread overview]
Message-ID: <1383131275.22559.8.camel@nilsson.home.kraxel.org> (raw)
In-Reply-To: <526AF64E.6040404@redhat.com>

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

  reply	other threads:[~2013-10-30 11:08 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-24 21:11 [Qemu-devel] [patch 0/2] align >4GB guest RAM to a 1GB boundary, in case of 1GB-sized hugetlbfs Marcelo Tosatti
2013-10-24 21:11 ` [Qemu-devel] [patch 1/2] exec: add qemu_get_ram_hpagesize Marcelo Tosatti
2013-10-24 21:12 ` [Qemu-devel] [patch 2/2] i386: pc: align gpa<->hpa on 1GB boundary Marcelo Tosatti
2013-10-24 21:55   ` Peter Maydell
2013-10-24 22:48     ` Marcelo Tosatti
2013-10-24 23:55   ` Paolo Bonzini
2013-10-25  4:58     ` Marcelo Tosatti
2013-10-25  8:52       ` Paolo Bonzini
2013-10-25 19:50         ` Marcelo Tosatti
2013-10-25 22:53           ` Paolo Bonzini
2013-10-30 11:07             ` Gerd Hoffmann [this message]
2013-10-30 11:47               ` Paolo Bonzini
2013-10-25  9:57       ` igor Mammedov
2013-10-25 13:34         ` Marcelo Tosatti
2013-10-27 15:20           ` igor Mammedov
2013-10-28 14:04             ` Marcelo Tosatti
2013-10-28 14:20               ` Marcelo Tosatti
2013-10-29 18:00               ` Igor Mammedov
2013-10-29 21:21                 ` Marcelo Tosatti
2013-10-30  8:48                   ` Gleb Natapov
2013-10-30 18:30                     ` Marcelo Tosatti
2013-10-29 18:18               ` [Qemu-devel] [RFC PATCH] pc: align gpa<->hpa on 1GB boundary by splitting RAM on several regions Igor Mammedov
2013-10-29 21:38                 ` Marcelo Tosatti
2013-10-30 16:49                   ` Igor Mammedov
2013-10-30 18:51                     ` Marcelo Tosatti
2013-10-30 19:03                       ` Marcelo Tosatti
2013-10-30 19:56                       ` Igor Mammedov
2013-10-30 23:44                         ` Marcelo Tosatti
2013-11-07 15:25                           ` Igor Mammedov
2013-10-30 19:31                     ` Marcelo Tosatti
2013-10-30 20:28                       ` Paolo Bonzini
2013-11-06  1:49   ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v2) Marcelo Tosatti
2013-11-06  1:55     ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v3) Marcelo Tosatti
2013-11-06 11:59       ` Igor Mammedov
2013-11-06 12:07         ` Paolo Bonzini
2013-11-06 12:22           ` Igor Mammedov
2013-11-06 12:24             ` Paolo Bonzini
2013-11-06 21:31       ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v4) Marcelo Tosatti
2013-11-06 21:40         ` Michael S. Tsirkin
2013-11-06 21:53           ` Marcelo Tosatti
2013-11-06 22:15             ` Michael S. Tsirkin
2013-11-06 22:24               ` Marcelo Tosatti
2013-11-07 15:24         ` Igor Mammedov
2013-11-07 21:53           ` Marcelo Tosatti
2013-11-10 20:47             ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v5) Marcelo Tosatti
2013-11-12 12:45               ` Igor Mammedov
2013-11-12 20:32                 ` Marcelo Tosatti
2013-11-12 21:16               ` [Qemu-devel] i386: pc: align gpa<->hpa on 1GB boundary (v6) Marcelo Tosatti
2013-11-13 13:59                 ` Igor Mammedov
2013-11-13 17:13                 ` Paolo Bonzini
     [not found]                   ` <20131113195832.GA29433@amt.cnet>
2013-11-13 20:39                     ` Marcelo Tosatti
2013-11-13 21:49                       ` Paolo Bonzini
2013-11-13 19:08                 ` Michael S. Tsirkin

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