[Qemu-devel] pert stat in KVM guest can not get LLC-loads hardware cache event

[Steven]

Dear KVM developers:
I am trying use perf stat inside a VM to obtain some hardware cache
performance counter values.
The perf stat can report some numbers for L1 and TLB related counters. But
for the LLC-loads and LLC-load-misses, the numbers are always 0. It seems
that the these offcore events are not exposed to the guest.

Is this a bug in Qemu or KVM?

My testbed is

Host kernel: 3.12.26
Qemu: 2.1.0
CPU: Intel Ivy bridge 2620
VM boosted by qemu, with -cpu host.

Thanks.

- Hui Kang