Messages in this thread | | | Subject | Re: [PATCH v14 00/11] KVM: x86/pmu: Guest Last Branch Recording Enabling | From | Liuxiangdong <> | Date | Thu, 29 Jul 2021 20:40:05 +0800 |
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Hi, like.
This patch set has been merged in 5.12 kernel tree so we can use LBR in Guest. Does it have requirement on CPU? I can use lbr in guest on skylake and icelake, but cannot on IvyBridge.
I can see lbr formats(000011b) in perf_capabilities msr(0x345), but there is still error when I try.
$ perf record -b Error: cycles: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
Host CPU: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 46 bits physical, 48 bits virtual CPU(s): 24 On-line CPU(s) list: 0-23 Thread(s) per core: 2 Core(s) per socket: 6 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Model name: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz Stepping: 4
Thanks! Xiangdong Liu
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