perf, kvm/arm64: Add stat support on arm64

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IZPY


CVE: NA

-------------------------------------------------

'perf kvm stat report/record' generates a statistical analysis of KVM
events and can be used to analyze guest exit reasons. This patch tries
to add stat support on arm64.

We have a mapping between guest's "exit_code" and "exit_reason" which
already exists under arch/arm64/include/asm/ (kvm_arm_exception_type),
and we've used it to report guest's exit type through trace_kvm_exit().
Copy kvm_arm_exception_type into aarch64_guest_exits.h, thus export it
to userspace.

It records on two available KVM tracepoints for arm64: "kvm:kvm_entry"
and "kvm:kvm_exit", and reports statistical data which includes events
handles time, samples, and so on.

A simple test go below:

 # pgrep qemu
6039
9937

 # ./tools/perf/perf kvm stat record -p 6039
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 15.629 MB perf.data.guest (199063 samples) ]

 # ./tools/perf/perf kvm stat report --event=vmexit

Analyze events for all VMs, all VCPUs:

             VM-EXIT    Samples  Samples%     Time%    Min Time    Max Time         Avg time

                TRAP      49040    97.15%   100.00%      2.60us   4072.98us   3431.60us ( +-   0.17% )
                 IRQ       1437     2.85%     0.00%      0.90us     24.56us      2.06us ( +-   1.37% )

Total Samples:50477, Total events handled time:168288630.04us.

Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Hailiang Zhang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/1560330526-15468-5-git-send-email-yuzenghui@huawei.com
Link: https://gitee.com/openeuler/kernel/commit/15db05576381


Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>