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perf/x86/lbr: Reset LBR_SELECT during vlbr reset 

lbr_select in kvm guest has residual data even if kvm guest is poweroff.
We can get residual data in the next boot. Because lbr_select is not
reset during kvm vlbr release. Let's reset LBR_SELECT during vlbr reset.

Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1636096851-36623-1-git-send-email-wanpengli@tencent.com
This commit is contained in:
Wanpeng Li 2021-11-05 00:20:51 -07:00 committed by Peter Zijlstra
parent debe436e77
commit 0fe39a3929
1 changed files with 2 additions and 0 deletions
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2
arch/x86/events/intel/lbr.c
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@ -265,6 +265,8 @@ void intel_pmu_lbr_reset(void)
cpuc->last_task_ctx = NULL;
cpuc->last_log_id = 0;
if (!static_cpu_has(X86_FEATURE_ARCH_LBR) && cpuc->lbr_select)
wrmsrl(MSR_LBR_SELECT, 0);
}
/*