KVM: arm64: Adjust entry/exit and trap related tracepoints

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


CVE: NA

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

Currently, we use trace_kvm_exit() to report exception type (e.g.,
"IRQ", "TRAP") and exception class (ESR_ELx's bit[31:26]) together.
But hardware only saves the exit class to ESR_ELx on synchronous
exceptions, not on asynchronous exceptions. When the guest exits
due to external interrupts, we will get tracing output like:

	"kvm_exit: IRQ: HSR_EC: 0x0000 (UNKNOWN), PC: 0xffff87259e30"

Obviously, "HSR_EC" here is meaningless.

This patch splits "exit" and "trap" events by adding two tracepoints
explicitly in handle_trap_exceptions(). Let trace_kvm_exit() report VM
exit events, and trace_kvm_trap_exit() report VM trap events.

These tracepoints are adjusted also in preparation for supporting
'perf kvm stat' on arm64.

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/1560330526-15468-3-git-send-email-yuzenghui@huawei.com
Link: https://gitee.com/openeuler/kernel/commit/14b85d8d7d2d


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