linux-kernel - [PATCH] x86/acpi fixes for 3.2 (v1) impacting distributions.

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Message-Id: <1320786914-10541-1-git-send-email-konrad.wilk@oracle.com>
Date:	Tue,  8 Nov 2011 16:15:11 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, x86@...nel.org, len.brown@...el.com,
	tglx@...utronix.de, jeremy@...p.org, hpa@...or.com, bp@...en8.de,
	tj@...nel.org, trenn@...e.de
Cc:	mingo@...hat.com, xen-devel@...ts.xensource.com
Subject: [PATCH] x86/acpi fixes for 3.2 (v1) impacting distributions.

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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