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KVM: Add trace markers

Browse source 
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>
This commit is contained in:
Feng (Eric) Liu 2008-04-10 15:31:10 -04:00 • committed by Avi Kivity
parent 53371b5098
commit 2714d1d3d6
5 changed files with 147 additions and 2 deletions
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49
include/linux/kvm.h
View file

@ -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.
*/