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KVM: stats: Support binary stats retrieval for a VCPU

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Add a VCPU ioctl to get a statistics file descriptor by which a read
functionality is provided for userspace to read out VCPU stats header,
descriptors and data.
Define VCPU statistics descriptors and header for all architectures.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com> #arm64
Signed-off-by: Jing Zhang <jingzhangos@google.com>
Message-Id: <20210618222709.1858088-5-jingzhangos@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Zhang 2021-06-18 22:27:06 +00:00 • committed by Paolo Bonzini
parent fcfe1baedd
commit ce55c04945
8 changed files with 359 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

13
include/linux/kvm_host.h
View file

@ -305,7 +305,6 @@ struct kvm_vcpu {
struct pid __rcu *pid;
int sigset_active;
sigset_t sigset;
struct kvm_vcpu_stat stat;
unsigned int halt_poll_ns;
bool valid_wakeup;
@ -342,6 +341,8 @@ struct kvm_vcpu {
bool preempted;
bool ready;
struct kvm_vcpu_arch arch;
struct kvm_vcpu_stat stat;
char stats_id[KVM_STATS_NAME_SIZE];
struct kvm_dirty_ring dirty_ring;
};
@ -1358,6 +1359,14 @@ struct _kvm_stats_desc {
#define KVM_GENERIC_VM_STATS() \
STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
#define KVM_GENERIC_VCPU_STATS() \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_attempted_poll), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_poll_invalid), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_wakeup), \
STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_success_ns), \
STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns)
extern struct kvm_stats_debugfs_item debugfs_entries[];
extern struct dentry *kvm_debugfs_dir;
ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
@ -1366,6 +1375,8 @@ ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
char __user *user_buffer, size_t size, loff_t *offset);
extern const struct kvm_stats_header kvm_vm_stats_header;
extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
extern const struct kvm_stats_header kvm_vcpu_stats_header;
extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)