#include <linux/module.h>
#include <linux/relay.h>
#include <linux/debugfs.h>
+#include <linux/ktime.h>
#include <linux/kvm_host.h>
struct kvm_trace_probe {
const char *name;
const char *format;
- u32 cycle_in;
+ u32 timestamp_in;
marker_probe_func *probe_func;
};
-static inline int calc_rec_size(int cycle, int extra)
+static inline int calc_rec_size(int timestamp, int extra)
{
int rec_size = KVM_TRC_HEAD_SIZE;
rec_size += extra;
- return cycle ? rec_size += KVM_TRC_CYCLE_SIZE : rec_size;
+ return timestamp ? rec_size += KVM_TRC_CYCLE_SIZE : rec_size;
}
static void kvm_add_trace(void *probe_private, void *call_data,
struct kvm_trace *kt = kvm_trace;
struct kvm_trace_rec rec;
struct kvm_vcpu *vcpu;
- int i, extra, size;
+ int i, size;
+ u32 extra;
if (unlikely(kt->trace_state != KVM_TRACE_STATE_RUNNING))
return;
- rec.event = va_arg(*args, u32);
+ rec.rec_val = TRACE_REC_EVENT_ID(va_arg(*args, u32));
vcpu = va_arg(*args, struct kvm_vcpu *);
rec.pid = current->tgid;
rec.vcpu_id = vcpu->vcpu_id;
extra = va_arg(*args, u32);
WARN_ON(!(extra <= KVM_TRC_EXTRA_MAX));
extra = min_t(u32, extra, KVM_TRC_EXTRA_MAX);
- rec.extra_u32 = extra;
- rec.cycle_in = p->cycle_in;
+ rec.rec_val |= TRACE_REC_TCS(p->timestamp_in)
+ | TRACE_REC_NUM_DATA_ARGS(extra);
- if (rec.cycle_in) {
- u64 cycle = 0;
+ if (p->timestamp_in) {
+ rec.u.timestamp.timestamp = ktime_to_ns(ktime_get());
- cycle = get_cycles();
- rec.u.cycle.cycle_lo = (u32)cycle;
- rec.u.cycle.cycle_hi = (u32)(cycle >> 32);
-
- for (i = 0; i < rec.extra_u32; i++)
- rec.u.cycle.extra_u32[i] = va_arg(*args, u32);
+ for (i = 0; i < extra; i++)
+ rec.u.timestamp.extra_u32[i] = va_arg(*args, u32);
} else {
- for (i = 0; i < rec.extra_u32; i++)
- rec.u.nocycle.extra_u32[i] = va_arg(*args, u32);
+ for (i = 0; i < extra; i++)
+ rec.u.notimestamp.extra_u32[i] = va_arg(*args, u32);
}
- size = calc_rec_size(rec.cycle_in, rec.extra_u32 * sizeof(u32));
+ size = calc_rec_size(p->timestamp_in, extra * sizeof(u32));
relay_write(kt->rchan, &rec, size);
}
{
struct kvm_trace *kt;
- if (!relay_buf_full(buf))
+ if (!relay_buf_full(buf)) {
+ if (!prev_subbuf) {
+ /*
+ * executed only once when the channel is opened
+ * save metadata as first record
+ */
+ subbuf_start_reserve(buf, sizeof(u32));
+ *(u32 *)subbuf = 0x12345678;
+ }
+
return 1;
+ }
kt = buf->chan->private_data;
atomic_inc(&kt->lost_records);