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xen-devel
[Xen-devel] [PATCH] x86/acpi fixes for 3.2 (v1) impacting distributions.
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linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, len.brown@xxxxxxxxx, tglx@xxxxxxxxxxxxx, jeremy@xxxxxxxx, hpa@xxxxxxxxx, bp@xxxxxxxxx, tj@xxxxxxxxxx, trenn@xxxxxxx |
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Subject: |
[Xen-devel] [PATCH] x86/acpi fixes for 3.2 (v1) impacting distributions. |
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From: |
Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
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Date: |
Tue, 8 Nov 2011 16:15:11 -0500 |
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Cc: |
mingo@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx |
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Tue, 08 Nov 2011 13:17:40 -0800 |
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I am posting three patches that are impacting distributions (both Ubuntu
and Fedora Core 16) when running the Linux v3.1 (or later) under Xen.
The first one is a regression:
[PATCH 1/3] cpuidle: If disable_cpuidle() is called, set pm_idle to
In 3.1 we set pm_idle to something else besides the default_idle which
is not good. We want to use the default_halt as it does a yield hypercall, while
the other pm_idle do not. Worst yet, when we would migrate a guest we could
be using the wrong pm_idle code (on AMD boxes).
The two other ones are more controversial and I am not sure if the path
I had choosen is the "best" to fix the corruption problem. The "Right Way"
would be to wrap pte_flags with a pvops call, but that has serious performance
drawback implications. Ad nauseum details are in the patch:
[PATCH 2/3] x86/cpa: Use pte_attrs instead of pte_flags on
and the last one is not that important, but nonethless if somebody is running
CONFIG_CPA_DEBUG and with a radeon or nouveau card they might get sporadic:
"CPA (x) bad PTE" messages. This patch fixes that.
[PATCH 3/3] x86/paravirt: Use pte_val instead of pte_flags on CPA
The patches are also located in
git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git stable/for-x86
arch/x86/include/asm/pgtable.h | 5 +++++
arch/x86/kernel/process.c | 5 +++++
arch/x86/mm/pageattr-test.c | 6 +++++-
arch/x86/mm/pageattr.c | 2 +-
include/linux/cpuidle.h | 2 ++
5 files changed, 18 insertions(+), 2 deletions(-)
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