diff options
| author | Feng (Eric) Liu <eric.e.liu@intel.com> | 2008-04-10 15:31:10 -0400 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 12:01:19 +0300 |
| commit | 2714d1d3d6be882b97cd0125140fccf9976a460a (patch) | |
| tree | 57b654cafff076ae95b62b7763113b1ef8511eb5 /include/linux/kvm.h | |
| parent | 53371b5098543ab09dcb0c7ce31da887dbe58c62 (diff) | |
| download | lwn-2714d1d3d6be882b97cd0125140fccf9976a460a.tar.gz lwn-2714d1d3d6be882b97cd0125140fccf9976a460a.zip | |
KVM: Add trace markers
Trace markers allow userspace to trace execution of a virtual machine
in order to monitor its performance.
Signed-off-by: Feng (Eric) Liu <eric.e.liu@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/linux/kvm.h')
| -rw-r--r-- | include/linux/kvm.h | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h index f04bb426618f..d302d63517e4 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -14,6 +14,12 @@ #define KVM_API_VERSION 12 +/* for KVM_TRACE_ENABLE */ +struct kvm_user_trace_setup { + __u32 buf_size; /* sub_buffer size of each per-cpu */ + __u32 buf_nr; /* the number of sub_buffers of each per-cpu */ +}; + /* for KVM_CREATE_MEMORY_REGION */ struct kvm_memory_region { __u32 slot; @@ -242,6 +248,42 @@ struct kvm_s390_interrupt { __u64 parm64; }; +#define KVM_TRC_SHIFT 16 +/* + * kvm trace categories + */ +#define KVM_TRC_ENTRYEXIT (1 << KVM_TRC_SHIFT) +#define KVM_TRC_HANDLER (1 << (KVM_TRC_SHIFT + 1)) /* only 12 bits */ + +/* + * kvm trace action + */ +#define KVM_TRC_VMENTRY (KVM_TRC_ENTRYEXIT + 0x01) +#define KVM_TRC_VMEXIT (KVM_TRC_ENTRYEXIT + 0x02) +#define KVM_TRC_PAGE_FAULT (KVM_TRC_HANDLER + 0x01) + +#define KVM_TRC_HEAD_SIZE 12 +#define KVM_TRC_CYCLE_SIZE 8 +#define KVM_TRC_EXTRA_MAX 7 + +/* This structure represents a single trace buffer record. */ +struct kvm_trace_rec { + __u32 event:28; + __u32 extra_u32:3; + __u32 cycle_in:1; + __u32 pid; + __u32 vcpu_id; + union { + struct { + __u32 cycle_lo, cycle_hi; + __u32 extra_u32[KVM_TRC_EXTRA_MAX]; + } cycle; + struct { + __u32 extra_u32[KVM_TRC_EXTRA_MAX]; + } nocycle; + } u; +}; + #define KVMIO 0xAE /* @@ -262,7 +304,12 @@ struct kvm_s390_interrupt { */ #define KVM_GET_VCPU_MMAP_SIZE _IO(KVMIO, 0x04) /* in bytes */ #define KVM_GET_SUPPORTED_CPUID _IOWR(KVMIO, 0x05, struct kvm_cpuid2) - +/* + * ioctls for kvm trace + */ +#define KVM_TRACE_ENABLE _IOW(KVMIO, 0x06, struct kvm_user_trace_setup) +#define KVM_TRACE_PAUSE _IO(KVMIO, 0x07) +#define KVM_TRACE_DISABLE _IO(KVMIO, 0x08) /* * Extension capability list. */ |