Hi, Jim
I am from Intel LKP team, we noticed that pmu_emulation was new added
recently by you.
We tested it and finished with 2 unexpected failures
```
timeout -k 1s --foreground 90s /usr/bin/qemu-system-x86_64 --no-reboot
-nodefaults -device pc-testdev -device
isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device
pci-testdev -machine accel=kvm -kernel x86/pmu.flat -smp 1 -cpu max
-append emulation # -initrd /tmp/tmp.Y0jCDA5Jlw
enabling apic
paging enabled
cr0 = 80010011
cr3 = 1007000
cr4 = 20
PMU version: 2
GP counters: 4
GP counter width: 48
Mask length: 7
Fixed counters: 3
Fixed counter width: 48
PASS: emulated instruction: instruction count
PASS: emulated instruction: branch count
FAIL: emulated instruction: instruction counter overflow
FAIL: emulated instruction: branch counter overflow
SUMMARY: 4 tests, 2 unexpected failures
```
we have tried on kernel v5.15 v5.16-rc5
on 2 different machine
machine 1:
```
model: Haswell
cpu: 8
memory: 16G
brand: Intel(R) Core(TM) i7-4790T CPU @ 2.70GH
```
machine2:
```
model: Ice Lake
cpu: 96
memory: 256G
kernel_cmdline_hw: acpi_rsdp=0x667fd014
rootfs_partition:
/dev/disk/by-id/ata-INTEL_SSDSC2BB800G4_PHWL4204005K800RGN-part3
```
If you confirm and fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Thanks
Ma Xinjian
