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Re: Using perf to access hardware events in pre-launched VM

Minggui Cao
 

Hi, Paolo,

 

Could you check again to rdmsr 0x186 and 0x38f?  If the ACRN has not pass-through PMU to VM, it shall  like following:

 

root@10239146109sos-dom0:~# dmesg | grep -i pmu

[    0.143455] Performance Events: unsupported p6 CPU model 140 no PMU driver, software events only.

root@10239146109sos-dom0:~# rdmsr 0x186

rdmsr: CPU 0 cannot read MSR 0x00000186

root@10239146109sos-dom0:~# rdmsr 0x38f

rdmsr: CPU 0 cannot read MSR 0x0000038f

 

 

But from your feedback, you can rdmsr 0x186 and no PMU driver. It is very strange.

 

Thanks!

Minggui

 

 

From: acrn-users@... <acrn-users@...> On Behalf Of Paolo Crotti
Sent: Monday, March 28, 2022 6:15 PM
To: acrn-users@...
Subject: Re: [acrn-users] Using perf to access hardware events in pre-launched VM

 

Hi Minggui,

I checked "dmesg | grep -i pmu" and it returned me:

[    0.075539] Performance Events: unsupported p6 CPU model 150 no PMU driver, software events only.

And all the events in your perf command are not in my "perf list".
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