Re: [PATCH] x86_32: trim memory by updating e820 v3

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From: Yinghai Lu

Subject: Re: [PATCH] x86_32: trim memory by updating e820 v3

Date: Monday, April 28, 2008 - 4:16 pm

On Mon, Apr 28, 2008 at 11:07 AM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
quoted text> "Yinghai Lu" <yhlu.kernel@gmail.com> writes:
>
>  > On Sat, Apr 26, 2008 at 5:56 AM, Gabriel C <nix.or.die@googlemail.com> wrote:
>
>
> > another continuous MTRR mapping.
>  >
>  > several months ago, we were talking about modifying MTRR. but Eric
>  > said that is not safe because acpi and smi...
>
>  I think it was Andi who spotted that originally, and yes I do think it
>  is a pretty horrific failure mode.  Reprogramming the MTRRs requires
>  full knowledge of the hardware and what is going on that we don't
>  always have.  PAT support has just been merged, and using that only
>  requires knowledge about the region whose attributes we intend to change.
>
>  So lets concentrate on PAT to solve contiguous MTRR region problems.
>
>  We can upgrade UC to WC with pat.  As well as demote WB to UC or WC.
>  So for those regions we know about we should be in good shape.
>
>  In a slightly related vein.  Trimming the memory we consider usable by
>  looking at MTRRs and if a region is not WB not considering it RAM
>  sounds like a very reasonable work around for one class of BIOS bugs.

yeah, i will look at to loop the ram region array instead of checking
highest_pfn only...


YH
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Messages in current thread:

[PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Sun Jan 20, 11:56 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Jesse Barnes, (Mon Jan 21, 9:30 am)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 21, 12:14 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Mon Jan 21, 1:09 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 21, 2:37 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Ingo Molnar, (Tue Jan 22, 9:51 am)

[PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Jan 22, 5:23 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Tue Jan 22, 8:50 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Fri Jan 25, 5:01 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Yinghai Lu, (Fri Jan 25, 5:16 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Fri Jan 25, 5:37 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Ingo Molnar, (Mon Jan 28, 8:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v2, Justin Piszcz, (Mon Jan 28, 11:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Andrew Morton, (Sat Apr 26, 3:56 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Sat Apr 26, 5:56 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 5:57 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 6:05 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sat Apr 26, 6:22 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Sun Apr 27, 1:21 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Sun Apr 27, 1:29 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sun Apr 27, 11:44 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Sun Apr 27, 11:50 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 1:38 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 2:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:18 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 2:34 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 2:44 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:54 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:58 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 3:03 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 3:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Mon Apr 28, 6:53 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 7:11 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 7:15 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 7:24 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Mon Apr 28, 9:09 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Mika Fischer, (Mon Apr 28, 9:31 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Mon Apr 28, 9:55 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Mon Apr 28, 11:07 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:03 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:06 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 12:08 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 12:38 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 12:46 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 1:45 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 2:19 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 3:03 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 3:56 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 4:16 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 4:23 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Gabriel C, (Mon Apr 28, 6:05 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Mon Apr 28, 7:41 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:31 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:34 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Ingo Molnar, (Tue Apr 29, 3:37 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 3:42 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Andrew Morton, (Tue Apr 29, 5:40 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Jesse Barnes, (Tue Apr 29, 8:52 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 10:29 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 11:40 am)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 12:19 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Yinghai Lu, (Tue Apr 29, 12:44 pm)

Re: [PATCH] x86_32: trim memory by updating e820 v3, Eric W. Biederman, (Tue Apr 29, 1:02 pm)

[patch] PCI: export resource_wc in pci sysfs, Ingo Molnar, (Tue Apr 29, 3:03 pm)

Re: [patch] PCI: export resource_wc in pci sysfs, Andrew Morton, (Tue Apr 29, 3:24 pm)

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