trace: remove code that depends on setting vcpu

Now we no longer have any events that are for vcpus we can start
excising the code from the trace control. As the vcpu parameter is
encoded as part of QMP we just stub out the has_vcpu/vcpu parameters
rather than alter the API.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20230526165401.574474-8-alex.bennee@linaro.org
Message-Id: <20230524133952.3971948-7-alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/hw/core/cpu-common.c b/hw/core/cpu-common.c
index 951477a7fd7ed148a926b311d2954fa8a895730a..f4e51c8a1b1fa9a9f2298b292e08ed71dc13c4ee 100644 (file)
--- a/hw/core/cpu-common.c
+++ b/hw/core/cpu-common.c
@@ -211,7 +211,6 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
     }
 
     /* NOTE: latest generic point where the cpu is fully realized */
-    trace_init_vcpu(cpu);
 }
 
 static void cpu_common_unrealizefn(DeviceState *dev)
@@ -219,7 +218,6 @@ static void cpu_common_unrealizefn(DeviceState *dev)
     CPUState *cpu = CPU(dev);
 
     /* NOTE: latest generic point before the cpu is fully unrealized */
-    trace_fini_vcpu(cpu);
     cpu_exec_unrealizefn(cpu);
 }
 

diff --git a/stubs/trace-control.c b/stubs/trace-control.c
index 7f856e5c24e34d41e87872308050b4584c955cab..b428f34c87881eb5af2f45be89e9a90e59b75d18 100644 (file)
--- a/stubs/trace-control.c
+++ b/stubs/trace-control.c
@@ -36,16 +36,3 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
         }
     }
 }
-
-void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
-                                        TraceEvent *ev, bool state)
-{
-    /* should never be called on non-target binaries */
-    abort();
-}
-
-void trace_init_vcpu(CPUState *vcpu)
-{
-    /* should never be called on non-target binaries */
-    abort();
-}

diff --git a/trace/control-internal.h b/trace/control-internal.h
index 0178121720d80aa43dab570b4a466981e40c98ab..8d818d359becfb2bd26648ee01abda5efaeb124f 100644 (file)
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -25,16 +25,6 @@ static inline uint32_t trace_event_get_id(TraceEvent *ev)
     return ev->id;
 }
 
-static inline uint32_t trace_event_get_vcpu_id(TraceEvent *ev)
-{
-    return 0;
-}
-
-static inline bool trace_event_is_vcpu(TraceEvent *ev)
-{
-    return false;
-}
-
 static inline const char * trace_event_get_name(TraceEvent *ev)
 {
     assert(ev != NULL);

diff --git a/trace/control-target.c b/trace/control-target.c
index a10752924b67556044e3265b8e60811d94eaaacf..97f21e476d2d7d7d77748669978fe4ca6aa00271 100644 (file)
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -36,112 +36,22 @@ void trace_event_set_state_dynamic_init(TraceEvent *ev, bool state)
 
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state)
 {
-    CPUState *vcpu;
     assert(trace_event_get_state_static(ev));
-    if (trace_event_is_vcpu(ev) && likely(first_cpu != NULL)) {
-        CPU_FOREACH(vcpu) {
-            trace_event_set_vcpu_state_dynamic(vcpu, ev, state);
-        }
-    } else {
-        /*
-         * Without the "vcpu" property, dstate can only be 1 or 0. With it, we
-         * haven't instantiated any vCPU yet, so we will set a global state
-         * instead, and trace_init_vcpu will reconcile it afterwards.
-         */
-        bool state_pre = *ev->dstate;
-        if (state_pre != state) {
-            if (state) {
-                trace_events_enabled_count++;
-                *ev->dstate = 1;
-            } else {
-                trace_events_enabled_count--;
-                *ev->dstate = 0;
-            }
-        }
-    }
-}
 
-static void trace_event_synchronize_vcpu_state_dynamic(
-    CPUState *vcpu, run_on_cpu_data ignored)
-{
-    bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed,
-                CPU_TRACE_DSTATE_MAX_EVENTS);
-    tcg_flush_jmp_cache(vcpu);
-}
-
-void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
-                                        TraceEvent *ev, bool state)
-{
-    uint32_t vcpu_id;
-    bool state_pre;
-    assert(trace_event_get_state_static(ev));
-    assert(trace_event_is_vcpu(ev));
-    vcpu_id = trace_event_get_vcpu_id(ev);
-    state_pre = test_bit(vcpu_id, vcpu->trace_dstate);
+    /*
+     * There is no longer a "vcpu" property, dstate can only be 1 or
+     * 0. With it, we haven't instantiated any vCPU yet, so we will
+     * set a global state instead, and trace_init_vcpu will reconcile
+     * it afterwards.
+     */
+    bool state_pre = *ev->dstate;
     if (state_pre != state) {
         if (state) {
             trace_events_enabled_count++;
-            set_bit(vcpu_id, vcpu->trace_dstate_delayed);
-            (*ev->dstate)++;
+            *ev->dstate = 1;
         } else {
             trace_events_enabled_count--;
-            clear_bit(vcpu_id, vcpu->trace_dstate_delayed);
-            (*ev->dstate)--;
-        }
-        if (vcpu->created) {
-            /*
-             * Delay changes until next TB; we want all TBs to be built from a
-             * single set of dstate values to ensure consistency of generated
-             * tracing code.
-             */
-            async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic,
-                             RUN_ON_CPU_NULL);
-        } else {
-            trace_event_synchronize_vcpu_state_dynamic(vcpu, RUN_ON_CPU_NULL);
-        }
-    }
-}
-
-static bool adding_first_cpu1(void)
-{
-    CPUState *cpu;
-    size_t count = 0;
-    CPU_FOREACH(cpu) {
-        count++;
-        if (count > 1) {
-            return false;
-        }
-    }
-    return true;
-}
-
-static bool adding_first_cpu(void)
-{
-    QEMU_LOCK_GUARD(&qemu_cpu_list_lock);
-
-    return adding_first_cpu1();
-}
-
-void trace_init_vcpu(CPUState *vcpu)
-{
-    TraceEventIter iter;
-    TraceEvent *ev;
-    trace_event_iter_init_all(&iter);
-    while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        if (trace_event_is_vcpu(ev) &&
-            trace_event_get_state_static(ev) &&
-            trace_event_get_state_dynamic(ev)) {
-            if (adding_first_cpu()) {
-                /* check preconditions */
-                assert(*ev->dstate == 1);
-                /* disable early-init state ... */
-                *ev->dstate = 0;
-                trace_events_enabled_count--;
-                /* ... and properly re-enable */
-                trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
-            } else {
-                trace_event_set_vcpu_state_dynamic(vcpu, ev, true);
-            }
+            *ev->dstate = 0;
         }
     }
 }

diff --git a/trace/control-vcpu.h b/trace/control-vcpu.h
index 0f98ebe7b5941239b7f5724ba053482981f0d65c..800fc5a21910aa99d28e74fc1010307adbf39d05 100644 (file)
--- a/trace/control-vcpu.h
+++ b/trace/control-vcpu.h
@@ -30,13 +30,6 @@
      trace_event_get_vcpu_state_dynamic_by_vcpu_id(                     \
          vcpu, _ ## id ## _EVENT.vcpu_id))
 
-/**
- * trace_event_get_vcpu_state_dynamic:
- *
- * Get the dynamic tracing state of an event for the given vCPU.
- */
-static bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu, TraceEvent *ev);
-
 #include "control-internal.h"
 
 static inline bool
@@ -51,13 +44,4 @@ trace_event_get_vcpu_state_dynamic_by_vcpu_id(CPUState *vcpu,
     }
 }
 
-static inline bool trace_event_get_vcpu_state_dynamic(CPUState *vcpu,
-                                                      TraceEvent *ev)
-{
-    uint32_t vcpu_id;
-    assert(trace_event_is_vcpu(ev));
-    vcpu_id = trace_event_get_vcpu_id(ev);
-    return trace_event_get_vcpu_state_dynamic_by_vcpu_id(vcpu, vcpu_id);
-}
-
 #endif

diff --git a/trace/control.c b/trace/control.c
index 5dfb60995485d545a2c837c4f11abcfaf5fe4c9d..1a48a7e266dc1b0d2db9ce30d59de3699c8c2e58 100644 (file)
--- a/trace/control.c
+++ b/trace/control.c
@@ -262,22 +262,6 @@ void trace_init_file(void)
 #endif
 }
 
-void trace_fini_vcpu(CPUState *vcpu)
-{
-    TraceEventIter iter;
-    TraceEvent *ev;
-
-    trace_event_iter_init_all(&iter);
-    while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        if (trace_event_is_vcpu(ev) &&
-            trace_event_get_state_static(ev) &&
-            trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
-            /* must disable to affect the global counter */
-            trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
-        }
-    }
-}
-
 bool trace_init_backends(void)
 {
 #ifdef CONFIG_TRACE_SIMPLE

diff --git a/trace/control.h b/trace/control.h
index 23b8393b297e379bb64e504f99a4606d705be768..dfd209edd839db1a38fdd5d86562164b6cad3f3a 100644 (file)
--- a/trace/control.h
+++ b/trace/control.h
@@ -89,23 +89,6 @@ static bool trace_event_is_pattern(const char *str);
  */
 static uint32_t trace_event_get_id(TraceEvent *ev);
 
-/**
- * trace_event_get_vcpu_id:
- *
- * Get the per-vCPU identifier of an event.
- *
- * Special value #TRACE_VCPU_EVENT_NONE means the event is not vCPU-specific
- * (does not have the "vcpu" property).
- */
-static uint32_t trace_event_get_vcpu_id(TraceEvent *ev);
-
-/**
- * trace_event_is_vcpu:
- *
- * Whether this is a per-vCPU event.
- */
-static bool trace_event_is_vcpu(TraceEvent *ev);
-
 /**
  * trace_event_get_name:
  *
@@ -172,21 +155,6 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
  */
 void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
 
-/**
- * trace_event_set_vcpu_state_dynamic:
- *
- * Set the dynamic tracing state of an event for the given vCPU.
- *
- * Pre-condition: trace_event_get_vcpu_state_static(ev) == true
- *
- * Note: Changes for execution-time events with the 'tcg' property will not be
- *       propagated until the next TB is executed (iff executing in TCG mode).
- */
-void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
-                                        TraceEvent *ev, bool state);
-
-
-
 /**
  * trace_init_backends:
  *
@@ -205,22 +173,6 @@ bool trace_init_backends(void);
  */
 void trace_init_file(void);
 
-/**
- * trace_init_vcpu:
- * @vcpu: Added vCPU.
- *
- * Set initial dynamic event state for a hot-plugged vCPU.
- */
-void trace_init_vcpu(CPUState *vcpu);
-
-/**
- * trace_fini_vcpu:
- * @vcpu: Removed vCPU.
- *
- * Disable dynamic event state for a hot-unplugged vCPU.
- */
-void trace_fini_vcpu(CPUState *vcpu);
-
 /**
  * trace_list_events:
  * @f: Where to send output.

diff --git a/trace/qmp.c b/trace/qmp.c
index 3b4f4702b4f02b8d5b6357b4e17877634508c1c4..aa760f1fc4ad9ebd1f9b978a7bed34364741eb4e 100644 (file)
--- a/trace/qmp.c
+++ b/trace/qmp.c
@@ -13,20 +13,7 @@
 #include "control-vcpu.h"
 
 
-static CPUState *get_cpu(bool has_vcpu, int vcpu, Error **errp)
-{
-    if (has_vcpu) {
-        CPUState *cpu = qemu_get_cpu(vcpu);
-        if (cpu == NULL) {
-            error_setg(errp, "invalid vCPU index %u", vcpu);
-        }
-        return cpu;
-    } else {
-        return NULL;
-    }
-}
-
-static bool check_events(bool has_vcpu, bool ignore_unavailable, bool is_pattern,
+static bool check_events(bool ignore_unavailable, bool is_pattern,
                          const char *name, Error **errp)
 {
     if (!is_pattern) {
@@ -38,12 +25,6 @@ static bool check_events(bool has_vcpu, bool ignore_unavailable, bool is_pattern
             return false;
         }
 
-        /* error for non-vcpu event */
-        if (has_vcpu && !trace_event_is_vcpu(ev)) {
-            error_setg(errp, "event \"%s\" is not vCPU-specific", name);
-            return false;
-        }
-
         /* error for unavailable event */
         if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
             error_setg(errp, "event \"%s\" is disabled", name);
@@ -70,22 +51,13 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
                                               bool has_vcpu, int64_t vcpu,
                                               Error **errp)
 {
-    Error *err = NULL;
     TraceEventInfoList *events = NULL;
     TraceEventIter iter;
     TraceEvent *ev;
     bool is_pattern = trace_event_is_pattern(name);
-    CPUState *cpu;
-
-    /* Check provided vcpu */
-    cpu = get_cpu(has_vcpu, vcpu, &err);
-    if (err) {
-        error_propagate(errp, err);
-        return NULL;
-    }
 
     /* Check events */
-    if (!check_events(has_vcpu, true, is_pattern, name, errp)) {
+    if (!check_events(true, is_pattern, name, errp)) {
         return NULL;
     }
 
@@ -93,33 +65,17 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name,
     trace_event_iter_init_pattern(&iter, name);
     while ((ev = trace_event_iter_next(&iter)) != NULL) {
         TraceEventInfo *value;
-        bool is_vcpu = trace_event_is_vcpu(ev);
-        if (has_vcpu && !is_vcpu) {
-            continue;
-        }
 
         value = g_new(TraceEventInfo, 1);
-        value->vcpu = is_vcpu;
         value->name = g_strdup(trace_event_get_name(ev));
 
         if (!trace_event_get_state_static(ev)) {
             value->state = TRACE_EVENT_STATE_UNAVAILABLE;
         } else {
-            if (has_vcpu) {
-                if (is_vcpu) {
-                    if (trace_event_get_vcpu_state_dynamic(cpu, ev)) {
-                        value->state = TRACE_EVENT_STATE_ENABLED;
-                    } else {
-                        value->state = TRACE_EVENT_STATE_DISABLED;
-                    }
-                }
-                /* else: already skipped above */
+            if (trace_event_get_state_dynamic(ev)) {
+                value->state = TRACE_EVENT_STATE_ENABLED;
             } else {
-                if (trace_event_get_state_dynamic(ev)) {
-                    value->state = TRACE_EVENT_STATE_ENABLED;
-                } else {
-                    value->state = TRACE_EVENT_STATE_DISABLED;
-                }
+                value->state = TRACE_EVENT_STATE_DISABLED;
             }
         }
         QAPI_LIST_PREPEND(events, value);
@@ -133,21 +89,12 @@ void qmp_trace_event_set_state(const char *name, bool enable,
                                bool has_vcpu, int64_t vcpu,
                                Error **errp)
 {
-    Error *err = NULL;
     TraceEventIter iter;
     TraceEvent *ev;
     bool is_pattern = trace_event_is_pattern(name);
-    CPUState *cpu;
-
-    /* Check provided vcpu */
-    cpu = get_cpu(has_vcpu, vcpu, &err);
-    if (err) {
-        error_propagate(errp, err);
-        return;
-    }
 
     /* Check events */
-    if (!check_events(has_vcpu, has_ignore_unavailable && ignore_unavailable,
+    if (!check_events(has_ignore_unavailable && ignore_unavailable,
                       is_pattern, name, errp)) {
         return;
     }
@@ -155,14 +102,9 @@ void qmp_trace_event_set_state(const char *name, bool enable,
     /* Apply changes (all errors checked above) */
     trace_event_iter_init_pattern(&iter, name);
     while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        if (!trace_event_get_state_static(ev) ||
-            (has_vcpu && !trace_event_is_vcpu(ev))) {
+        if (!trace_event_get_state_static(ev)) {
             continue;
         }
-        if (has_vcpu) {
-            trace_event_set_vcpu_state_dynamic(cpu, ev, enable);
-        } else {
-            trace_event_set_state_dynamic(ev, enable);
-        }
+        trace_event_set_state_dynamic(ev, enable);
     }
 }

diff --git a/trace/trace-hmp-cmds.c b/trace/trace-hmp-cmds.c
index 792876c34abc4fce8710875c3d226121bc07f48b..86211fce27397e091953a88c56813e88acad88c5 100644 (file)
--- a/trace/trace-hmp-cmds.c
+++ b/trace/trace-hmp-cmds.c
@@ -37,16 +37,10 @@ void hmp_trace_event(Monitor *mon, const QDict *qdict)
 {
     const char *tp_name = qdict_get_str(qdict, "name");
     bool new_state = qdict_get_bool(qdict, "option");
-    bool has_vcpu = qdict_haskey(qdict, "vcpu");
-    int vcpu = qdict_get_try_int(qdict, "vcpu", 0);
     Error *local_err = NULL;
 
-    if (vcpu < 0) {
-        monitor_printf(mon, "argument vcpu must be positive");
-        return;
-    }
-
-    qmp_trace_event_set_state(tp_name, new_state, true, true, has_vcpu, vcpu, &local_err);
+    qmp_trace_event_set_state(tp_name, new_state,
+                              true, true, false, 0, &local_err);
     if (local_err) {
         error_report_err(local_err);
     }
@@ -80,8 +74,6 @@ void hmp_trace_file(Monitor *mon, const QDict *qdict)
 void hmp_info_trace_events(Monitor *mon, const QDict *qdict)
 {
     const char *name = qdict_get_try_str(qdict, "name");
-    bool has_vcpu = qdict_haskey(qdict, "vcpu");
-    int vcpu = qdict_get_try_int(qdict, "vcpu", 0);
     TraceEventInfoList *events;
     TraceEventInfoList *elem;
     Error *local_err = NULL;
@@ -89,12 +81,8 @@ void hmp_info_trace_events(Monitor *mon, const QDict *qdict)
     if (name == NULL) {
         name = "*";
     }
-    if (vcpu < 0) {
-        monitor_printf(mon, "argument vcpu must be positive");
-        return;
-    }
 
-    events = qmp_trace_event_get_state(name, has_vcpu, vcpu, &local_err);
+    events = qmp_trace_event_get_state(name, false, 0, &local_err);
     if (local_err) {
         error_report_err(local_err);
         return;