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Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram |
Date: |
Mon, 20 Jan 2014 13:23:45 +0200 |
On Tue, Dec 17, 2013 at 06:56:06PM +0100, Gerd Hoffmann wrote:
> > I merged your patch but split it: q35 is separate and piix
> > is separate. Would you like me to drop the q35 part then?
>
> If you are fine with q35 having only 2G lowmem keep it. It's safe.
>
> We can sort the mmconfig setup afterwards, then check if (and how) we'll
> transition to 3G lowmem. Maybe we simply don't after all, with the
> world moving to 64bit it doesn't matter that much whenever memory is
> mapped above or below 4g. And for old 32bit guests there is always the
> option to stick with piix which continues to offers up to 3.5G lowmem.
>
> cheers,
> Gerd
>
Any update here?
I'm worried 2G lowmem is a bit too aggressive, PAE still exists.
If we want to support old bios, one way would be to add
a new register to enable 3g lowmem.
Or just ignore the issue with new machine types.
--
MST
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Michael S. Tsirkin, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Igor Mammedov, 2014/01/20
- Re: [Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram, Gerd Hoffmann, 2014/01/21