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xen-devel
[Xen-devel] Re: [PATCH 06/16] xen: disable PAT
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To: |
Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 06/16] xen: disable PAT |
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From: |
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> |
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Date: |
Fri, 8 May 2009 15:50:31 +0100 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Suresh Siddha <suresh.b.siddha@xxxxxxxxx>, Linux, "Pallipadi, Venkatesh" <venkatesh.pallipadi@xxxxxxxxx>, Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Yinghai, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Lu <yinghai@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx> |
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Delivery-date: |
Fri, 08 May 2009 23:21:29 -0700 |
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References: |
<1241730653-4688-1-git-send-email-jeremy@xxxxxxxx> <1241730653-4688-7-git-send-email-jeremy@xxxxxxxx> <20090508111432.GF11596@xxxxxxx> <1241786311.16804.56.camel@xxxxxxxxxxxxxxxxxxxxxx> |
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xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
> Roughly speaking the kernel needs to cope with different values written
> to MSR_IA32_CR_PAT than the single hard coded value it would write
> itself if given the chance. Essentially _PAGE_CACHE_* need to become
> dynamic (or I guess we could change the native layout to match Xen's, I
> don't know why native differs from the initial state, I guess just to
> avoid using the PAT bit for some reason.
Because it is required for some processor variants due to errata. This is
also why the BIOS has them programmed as a mirror between 0-3 and 4-7.
I don't think changing Linux here is the right thing to do - if anything
Xen probably needs to change.
See Xeon errata P21.
Alan
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- [Xen-devel] [GIT PULL] xen: core dom0 support, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 12/16] xen/dom0: add XEN_DOM0 config option, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 11/16] xen: allow enable use of VGA console on dom0, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 10/16] xen: clear reserved bits in l3 entries given in the initial pagetables, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 06/16] xen: disable PAT, Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Ingo Molnar
- [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Ian Campbell
- [Xen-devel] Re: [PATCH 06/16] xen: disable PAT,
Alan Cox <=
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Keir Fraser
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, H. Peter Anvin
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Keir Fraser
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Alan Cox
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Keir Fraser
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Jan Beulich
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Keir Fraser
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Jeremy Fitzhardinge
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, H. Peter Anvin
- Re: [Xen-devel] Re: [PATCH 06/16] xen: disable PAT, Ingo Molnar
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