From: Peter Zijlstra <pet...@infradead.org> [ Upstream commit d7262457e35dbe239659e62654e56f8ddb814bed ]
Stephane reported that the TFA MSR is not initialized by the kernel, but the TFA bit could set by firmware or as a leftover from a kexec, which makes the state inconsistent. Reported-by: Stephane Eranian <eran...@google.com> Tested-by: Nelson DSouza <nelson.dso...@intel.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Vince Weaver <vincent.wea...@maine.edu> Cc: to...@suse.com Link: https://lkml.kernel.org/r/20190321123849.gn6...@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mi...@kernel.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- arch/x86/events/intel/core.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c index c02a8e6aff52..de0346d651f0 100644 --- a/arch/x86/events/intel/core.c +++ b/arch/x86/events/intel/core.c @@ -3447,6 +3447,12 @@ static void intel_pmu_cpu_starting(int cpu) cpuc->lbr_sel = NULL; + if (x86_pmu.flags & PMU_FL_TFA) { + WARN_ON_ONCE(cpuc->tfa_shadow); + cpuc->tfa_shadow = ~0ULL; + intel_set_tfa(cpuc, false); + } + if (x86_pmu.version > 1) flip_smm_bit(&x86_pmu.attr_freeze_on_smi); -- 2.19.1
