This is a note to let you know that I've just added the patch titled
intel_pstate: Add X86_FEATURE_APERFMPERF to cpu match parameters.
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
intel_pstate-add-x86_feature_aperfmperf-to-cpu-match-parameters.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6cbd7ee10e2842a3d1f9b60abede1c8f3d1f1130 Mon Sep 17 00:00:00 2001
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Date: Mon, 6 Jan 2014 10:59:16 -0800
Subject: intel_pstate: Add X86_FEATURE_APERFMPERF to cpu match parameters.
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
commit 6cbd7ee10e2842a3d1f9b60abede1c8f3d1f1130 upstream.
KVM environments do not support APERF/MPERF MSRs. intel_pstate cannot
operate without these registers.
The previous validity checks in intel_pstate_msrs_not_valid() are
insufficent in nested KVMs.
References: https://bugzilla.redhat.com/show_bug.cgi?id=1046317
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/intel_pstate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -518,7 +518,8 @@ static void intel_pstate_timer_func(unsi
}
#define ICPU(model, policy) \
- { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&policy }
+ { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
+ (unsigned long)&policy }
static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
ICPU(0x2a, default_policy),
Patches currently in stable-queue which might be from dirk.j.brandewie@xxxxxxxxx are
queue-3.12/intel_pstate-add-x86_feature_aperfmperf-to-cpu-match-parameters.patch
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