perf/x86/intel: Don't enable freeze-on-smi for PerfMon V1
authorKan Liang <kan.liang@linux.intel.com>
Wed, 25 Apr 2018 18:57:17 +0000 (14:57 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 20 Jun 2018 19:02:48 +0000 (04:02 +0900)
commitaf22d1b7705a130ccf917d806a139ea9ff1e9703
treed2b6953672054392696ca024e61d1f87ac9c2f21
parent3958294c661e35e8454147c7fc7df60c35d989c2
perf/x86/intel: Don't enable freeze-on-smi for PerfMon V1

[ Upstream commit 4e949e9b9d1e3edcdab3b54656c5851bd9e49c67 ]

The SMM freeze feature was introduced since PerfMon V2. But the current
code unconditionally enables the feature for all platforms. It can
generate #GP exception, if the related FREEZE_WHILE_SMM bit is set for
the machine with PerfMon V1.

To disable the feature for PerfMon V1, perf needs to
- Remove the freeze_on_smi sysfs entry by moving intel_pmu_attrs to
  intel_pmu, which is only applied to PerfMon V2 and later.
- Check the PerfMon version before flipping the SMM bit when starting CPU

Fixes: 6089327f5424 ("perf/x86: Add sysfs entry to freeze counters on SMI")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: ak@linux.intel.com
Cc: eranian@google.com
Cc: acme@redhat.com
Link: https://lkml.kernel.org/r/1524682637-63219-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/events/intel/core.c