virt inclusion
category: feature
bugzilla: 46853
CVE: NA

This patch create debugfs entry for vcpu stat.
The entry path is /sys/kernel/debug/kvm/vcpu_stat.
And vcpu_stat contains partial kvm exits items of vcpu, include:
	pid, hvc_exit_stat, wfe_exit_stat, wfi_exit_stat,
	mmio_exit_user, mmio_exit_kernel, exits

Currently, The maximum vcpu limit is 1024.

From this vcpu_stat, user can get the number of these kvm exits items
over a period of time, which is helpful to monitor the virtual machine.
Signed-off-by: NZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Nchenjiajun <chenjiajun8@huawei.com>
Reviewed-by: NXiangyou Xie <xiexiangyou@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>