Re: [perf] unchecked MSR access error: WRMSR to 0x689 in intel_pmu_lbr_restore

[Vince Weaver]

On Tue, 12 Jul 2022, Liang, Kan wrote:

> 
> Could you please apply the below patch, reboot to the patched kernel and
> share the dmesg log?

here's the info with your patch applied:

[    0.000000] microcode: microcode updated early to revision 0x28, date = 2019-11-12
...
[    1.460296] NO HLE NO RTM. LBR has tsx 0
[    1.468217] Haswell events, 16-deep LBR, full-width counters, Intel PMU driver.
[    1.472292] ... version:                3
[    1.476275] ... bit width:              48
[    1.480275] ... generic registers:      4
[    1.484276] ... value mask:             0000ffffffffffff
[    1.488277] ... max period:             00007fffffffffff
[    1.492277] ... fixed-purpose events:   3
[    1.496271] ... event mask:             000000070000000f

Vince