Il 29/11/2013 18:59, Wang Hui ha scritto: > But when I wrote a test module to make IA32_PMC1 to count the event of > unhalted > cpu-cycles, after migration the value of IA32_PMC1 never grows up again. I > found > that after migration perf_event was created exactly, but when it was created, > "current" is qemu's main thread which won't enter no-root mode, so the count > of > perf_event will never increase.
I think the fix is to apply the MSRs in QEMU's VCPU thread, through run_on_cpu. Interesting that I could not reproduce this when testing my patches. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
