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authorFeng (Eric) Liu <eric.e.liu@intel.com>2008-04-10 15:31:10 -0400
committerAvi Kivity <avi@qumranet.com>2008-04-27 12:01:19 +0300
commit2714d1d3d6be882b97cd0125140fccf9976a460a (patch)
tree57b654cafff076ae95b62b7763113b1ef8511eb5 /include/linux
parent53371b5098543ab09dcb0c7ce31da887dbe58c62 (diff)
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')
-rw-r--r--include/linux/kvm.h49
1 files changed, 48 insertions, 1 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index f04bb426618..d302d63517e 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.
*/