Commit 06f89a27 authored by chenjiajun's avatar chenjiajun Committed by liangtian
Browse files

kvm: debugfs: Export vcpu stat via debugfs 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I919BF


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: default avatarchenjiajun <chenjiajun8@huawei.com>
Signed-off-by: default avatarliangtian <liangtian13@huawei.com>
parent 54465add

arch/arm64/configs/openeuler_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -7704,6 +7704,7 @@ CONFIG_BTREE=y 
CONFIG_INTERVAL_TREE=y

CONFIG_INTERVAL_TREE_SPAN_ITER=y

CONFIG_XARRAY_MULTI=y

CONFIG_ARCH_VCPU_STAT=y

CONFIG_ASSOCIATIVE_ARRAY=y

CONFIG_HAS_IOMEM=y

CONFIG_HAS_IOPORT=y

arch/arm64/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -910,6 +910,7 @@ struct kvm_vm_stat { 
};



struct kvm_vcpu_stat {

	u64 pid;

	struct kvm_vcpu_stat_generic generic;

	u64 hvc_exit_stat;

	u64 wfe_exit_stat;

arch/arm64/kvm/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -72,4 +72,13 @@ config PROTECTED_NVHE_STACKTRACE 


	  If unsure, or not using protected nVHE (pKVM), say N.



config ARCH_VCPU_STAT

	bool "export kvm exits to vcpu_stat"

	depends on KVM

	default n

	help

	  Say Y here to enable kvm exits counting



	  If unsure, say N.



endif # VIRTUALIZATION

arch/arm64/kvm/guest.c

+19 −1
Original line number Diff line number Diff line
@@ -29,6 +29,21 @@ 


#include "trace.h"



#ifdef CONFIG_ARCH_VCPU_STAT

/* debugfs entries of Detail For vcpu stat EXtension */

struct dfx_kvm_stats_debugfs_item dfx_debugfs_entries[] = {

	DFX_STAT("pid", pid),

	DFX_STAT("hvc_exit_stat", hvc_exit_stat),

	DFX_STAT("wfe_exit_stat", wfe_exit_stat),

	DFX_STAT("wfi_exit_stat", wfi_exit_stat),

	DFX_STAT("mmio_exit_user", mmio_exit_user),

	DFX_STAT("mmio_exit_kernel", mmio_exit_kernel),

	DFX_STAT("signal_exits", signal_exits),

	DFX_STAT("exits", exits),

	{ NULL }

};

#endif



const struct _kvm_stats_desc kvm_vm_stats_desc[] = {

	KVM_GENERIC_VM_STATS()

};
@@ -50,7 +65,10 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { 
	STATS_DESC_COUNTER(VCPU, mmio_exit_user),

	STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),

	STATS_DESC_COUNTER(VCPU, signal_exits),

	STATS_DESC_COUNTER(VCPU, exits)

	STATS_DESC_COUNTER(VCPU, exits),

#ifdef CONFIG_ARCH_VCPU_STAT

	STATS_DESC_DFX_COUNTER(DFX, vcpu_stat)

#endif

};



const struct kvm_stats_header kvm_vcpu_stats_header = {

arch/x86/configs/openeuler_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -742,6 +742,7 @@ CONFIG_HAVE_KVM_NO_POLL=y 
CONFIG_KVM_XFER_TO_GUEST_WORK=y

CONFIG_HAVE_KVM_PM_NOTIFIER=y

CONFIG_KVM_GENERIC_HARDWARE_ENABLING=y

CONFIG_ARCH_VCPU_STAT=y

CONFIG_VIRTUALIZATION=y

CONFIG_KVM=m

CONFIG_KVM_INTEL=m