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>

3 files changed, 87 insertions, 1 deletions

diff --git a/include/asm-x86/kvm.h b/include/asm-x86/kvm.h
index 12b4b25371d5..80eefef2cc76 100644
--- a/include/asm-x86/kvm.h
+++ b/include/asm-x86/kvm.h
@@ -209,4 +209,24 @@ struct kvm_pit_state {
         struct kvm_pit_channel_state channels[3];
 };
 
+#define KVM_TRC_INJ_VIRQ         (KVM_TRC_HANDLER + 0x02)
+#define KVM_TRC_REDELIVER_EVT    (KVM_TRC_HANDLER + 0x03)
+#define KVM_TRC_PEND_INTR        (KVM_TRC_HANDLER + 0x04)
+#define KVM_TRC_IO_READ          (KVM_TRC_HANDLER + 0x05)
+#define KVM_TRC_IO_WRITE         (KVM_TRC_HANDLER + 0x06)
+#define KVM_TRC_CR_READ          (KVM_TRC_HANDLER + 0x07)
+#define KVM_TRC_CR_WRITE         (KVM_TRC_HANDLER + 0x08)
+#define KVM_TRC_DR_READ          (KVM_TRC_HANDLER + 0x09)
+#define KVM_TRC_DR_WRITE         (KVM_TRC_HANDLER + 0x0A)
+#define KVM_TRC_MSR_READ         (KVM_TRC_HANDLER + 0x0B)
+#define KVM_TRC_MSR_WRITE        (KVM_TRC_HANDLER + 0x0C)
+#define KVM_TRC_CPUID            (KVM_TRC_HANDLER + 0x0D)
+#define KVM_TRC_INTR             (KVM_TRC_HANDLER + 0x0E)
+#define KVM_TRC_NMI              (KVM_TRC_HANDLER + 0x0F)
+#define KVM_TRC_VMMCALL          (KVM_TRC_HANDLER + 0x10)
+#define KVM_TRC_HLT              (KVM_TRC_HANDLER + 0x11)
+#define KVM_TRC_CLTS             (KVM_TRC_HANDLER + 0x12)
+#define KVM_TRC_LMSW             (KVM_TRC_HANDLER + 0x13)
+#define KVM_TRC_APIC_ACCESS      (KVM_TRC_HANDLER + 0x14)
+
 #endif
diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 286117878ce2..15169cb71c83 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -667,4 +667,23 @@ enum {
         TASK_SWITCH_GATE = 3,
 };
 
+#define KVMTRACE_5D(evt, vcpu, d1, d2, d3, d4, d5, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 5, d1, d2, d3, d4, d5)
+#define KVMTRACE_4D(evt, vcpu, d1, d2, d3, d4, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 4, d1, d2, d3, d4, 0)
+#define KVMTRACE_3D(evt, vcpu, d1, d2, d3, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 3, d1, d2, d3, 0, 0)
+#define KVMTRACE_2D(evt, vcpu, d1, d2, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 2, d1, d2, 0, 0, 0)
+#define KVMTRACE_1D(evt, vcpu, d1, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 1, d1, 0, 0, 0, 0)
+#define KVMTRACE_0D(evt, vcpu, name) \
+        trace_mark(kvm_trace_##name, "%u %p %u %u %u %u %u %u", KVM_TRC_##evt, \
+                                                vcpu, 0, 0, 0, 0, 0, 0)
+
 #endif
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.
  */