Merge remote-tracking branch 'stefanha/tracing' into staging

21 files changed, 719 insertions, 490 deletions

diff --git a/Makefile b/Makefile
index 86068498e9..13be25a382 100644
--- a/Makefile
+++ b/Makefile
@@ -209,6 +209,7 @@ clean:
 	rm -Rf .libs
 	rm -f slirp/*.o slirp/*.d audio/*.o audio/*.d block/*.o block/*.d net/*.o net/*.d fsdev/*.o fsdev/*.d ui/*.o ui/*.d qapi/*.o qapi/*.d qga/*.o qga/*.d
 	rm -f qemu-img-cmds.h
+	rm -f trace/*.o trace/*.d
 	rm -f trace.c trace.h trace.c-timestamp trace.h-timestamp
 	rm -f trace-dtrace.dtrace trace-dtrace.dtrace-timestamp
 	rm -f trace-dtrace.h trace-dtrace.h-timestamp
diff --git a/Makefile.objs b/Makefile.objs
index d1f3e5dae5..26b885bfeb 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -372,18 +372,24 @@ trace-dtrace.lo: trace-dtrace.dtrace
 	$(call quiet-command,$(LIBTOOL) --mode=compile --tag=CC dtrace -o $@ -G -s $<, "  lt GEN trace-dtrace.o")
 endif
 
-simpletrace.o: simpletrace.c $(GENERATED_HEADERS)
+trace/simple.o: trace/simple.c $(GENERATED_HEADERS)
 
-ifeq ($(TRACE_BACKEND),dtrace)
-trace-obj-y = trace-dtrace.o
-else
+trace-obj-$(CONFIG_TRACE_DTRACE) += trace-dtrace.o
+ifneq ($(TRACE_BACKEND),dtrace)
 trace-obj-y = trace.o
-ifeq ($(TRACE_BACKEND),simple)
-trace-obj-y += simpletrace.o
-user-obj-y += qemu-timer-common.o
-endif
 endif
 
+trace-nested-$(CONFIG_TRACE_DEFAULT) += default.o
+
+trace-nested-$(CONFIG_TRACE_SIMPLE) += simple.o
+trace-obj-$(CONFIG_TRACE_SIMPLE) += qemu-timer-common.o
+
+trace-nested-$(CONFIG_TRACE_STDERR) += stderr.o
+
+trace-nested-y += control.o
+
+trace-obj-y += $(addprefix trace/, $(trace-nested-y))
+
 ######################################################################
 # smartcard
 
diff --git a/Makefile.target b/Makefile.target
index 07af4d47c7..25c16d7f16 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -44,7 +44,7 @@ endif
 config-target.h: config-target.h-timestamp
 config-target.h-timestamp: config-target.mak
 
-ifdef CONFIG_SYSTEMTAP_TRACE
+ifdef CONFIG_TRACE_SYSTEMTAP
 stap: $(QEMU_PROG).stp
 
 ifdef CONFIG_USER_ONLY
@@ -398,7 +398,7 @@ obj-y += $(addprefix ../, $(trace-obj-y))
 obj-$(CONFIG_GDBSTUB_XML) += gdbstub-xml.o
 
 $(QEMU_PROG): $(obj-y) $(obj-$(TARGET_BASE_ARCH)-y)
-	$(call LINK,$(obj-y) $(obj-$(TARGET_BASE_ARCH)-y))
+	$(call LINK,$^)
 
 
 gdbstub-xml.c: $(TARGET_XML_FILES) $(SRC_PATH)/scripts/feature_to_c.sh
@@ -414,7 +414,7 @@ clean:
 	rm -f *.o *.a *~ $(PROGS) nwfpe/*.o fpu/*.o
 	rm -f *.d */*.d tcg/*.o ide/*.o 9pfs/*.o
 	rm -f hmp-commands.h qmp-commands.h gdbstub-xml.c
-ifdef CONFIG_SYSTEMTAP_TRACE
+ifdef CONFIG_TRACE_SYSTEMTAP
 	rm -f *.stp
 endif
 
@@ -425,7 +425,7 @@ ifneq ($(STRIP),)
 	$(STRIP) $(patsubst %,"$(DESTDIR)$(bindir)/%",$(PROGS))
 endif
 endif
-ifdef CONFIG_SYSTEMTAP_TRACE
+ifdef CONFIG_TRACE_SYSTEMTAP
 	$(INSTALL_DIR) "$(DESTDIR)$(datadir)/../systemtap/tapset"
 	$(INSTALL_DATA) $(QEMU_PROG).stp "$(DESTDIR)$(datadir)/../systemtap/tapset"
 endif
diff --git a/configure b/configure
index 1340c33ef8..300d34bd32 100755
--- a/configure
+++ b/configure
@@ -3064,18 +3064,35 @@ bsd)
 ;;
 esac
 
+# use default implementation for tracing backend-specific routines
+trace_default=yes
 echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
-if test "$trace_backend" = "simple"; then
-  echo "CONFIG_SIMPLE_TRACE=y" >> $config_host_mak
+if test "$trace_backend" = "nop"; then
+  echo "CONFIG_TRACE_NOP=y" >> $config_host_mak
 fi
-# Set the appropriate trace file.
 if test "$trace_backend" = "simple"; then
+  echo "CONFIG_TRACE_SIMPLE=y" >> $config_host_mak
+  trace_default=no
+  # Set the appropriate trace file.
   trace_file="\"$trace_file-\" FMT_pid"
 fi
-if test "$trace_backend" = "dtrace" -a "$trace_backend_stap" = "yes" ; then
-  echo "CONFIG_SYSTEMTAP_TRACE=y" >> $config_host_mak
+if test "$trace_backend" = "stderr"; then
+  echo "CONFIG_TRACE_STDERR=y" >> $config_host_mak
+  trace_default=no
+fi
+if test "$trace_backend" = "ust"; then
+  echo "CONFIG_TRACE_UST=y" >> $config_host_mak
+fi
+if test "$trace_backend" = "dtrace"; then
+  echo "CONFIG_TRACE_DTRACE=y" >> $config_host_mak
+  if test "$trace_backend_stap" = "yes" ; then
+    echo "CONFIG_TRACE_SYSTEMTAP=y" >> $config_host_mak
+  fi
 fi
 echo "CONFIG_TRACE_FILE=$trace_file" >> $config_host_mak
+if test "$trace_default" = "yes"; then
+  echo "CONFIG_TRACE_DEFAULT=y" >> $config_host_mak
+fi
 
 echo "TOOLS=$tools" >> $config_host_mak
 echo "ROMS=$roms" >> $config_host_mak
diff --git a/docs/tracing.txt b/docs/tracing.txt
index c99a0f27cf..4b27ab0c2a 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -12,13 +12,14 @@ for debugging, profiling, and observing execution.
     ./configure --trace-backend=simple
     make
 
-2. Enable trace events you are interested in:
+2. Create a file with the events you want to trace:
 
-    $EDITOR trace-events  # remove "disable" from events you want
+   echo bdrv_aio_readv   > /tmp/events
+   echo bdrv_aio_writev >> /tmp/events
 
 3. Run the virtual machine to produce a trace file:
 
-    qemu ... # your normal QEMU invocation
+    qemu -trace events=/tmp/events ... # your normal QEMU invocation
 
 4. Pretty-print the binary trace file:
 
@@ -38,7 +39,7 @@ generate code for the trace events.  Trace events are invoked directly from
 source code like this:
 
     #include "trace.h"  /* needed for trace event prototype */
-
+    
     void *qemu_malloc(size_t size)
     {
         void *ptr;
@@ -103,10 +104,45 @@ portability macros, ensure they are preceded and followed by double quotes:
 4. Name trace events after their function.  If there are multiple trace events
    in one function, append a unique distinguisher at the end of the name.
 
-5. Declare trace events with the "disable" keyword.  Some trace events can
-   produce a lot of output and users are typically only interested in a subset
-   of trace events.  Marking trace events disabled by default saves the user
-   from having to manually disable noisy trace events.
+5. If specific trace events are going to be called a huge number of times, this
+   might have a noticeable performance impact even when the trace events are
+   programmatically disabled. In this case you should declare the trace event
+   with the "disable" property, which will effectively disable it at compile
+   time (using the "nop" backend).
+
+== Generic interface and monitor commands ==
+
+You can programmatically query and control the dynamic state of trace events
+through a backend-agnostic interface:
+
+* trace_print_events
+
+* trace_event_set_state
+  Enables or disables trace events at runtime inside QEMU.
+  The function returns "true" if the state of the event has been successfully
+  changed, or "false" otherwise:
+
+    #include "trace/control.h"
+    
+    trace_event_set_state("virtio_irq", true); /* enable */
+    [...]
+    trace_event_set_state("virtio_irq", false); /* disable */
+
+Note that some of the backends do not provide an implementation for this
+interface, in which case QEMU will just print a warning.
+
+This functionality is also provided through monitor commands:
+
+* info trace-events
+  View available trace events and their state.  State 1 means enabled, state 0
+  means disabled.
+
+* trace-event NAME on|off
+  Enable/disable a given trace event.
+
+The "-trace events=<file>" command line argument can be used to enable the
+events listed in <file> from the very beginning of the program. This file must
+contain one event name per line.
 
 == Trace backends ==
 
@@ -131,6 +167,9 @@ The "nop" backend generates empty trace event functions so that the compiler
 can optimize out trace events completely.  This is the default and imposes no
 performance penalty.
 
+Note that regardless of the selected trace backend, events with the "disable"
+property will be generated with the "nop" backend.
+
 === Stderr ===
 
 The "stderr" backend sends trace events directly to standard error.  This
@@ -157,27 +196,9 @@ unless you have specific needs for more advanced backends.
   flushed and emptied.  This means the 'info trace' will display few or no
   entries if the buffer has just been flushed.
 
-* info trace-events
-  View available trace events and their state.  State 1 means enabled, state 0
-  means disabled.
-
-* trace-event NAME on|off
-  Enable/disable a given trace event.
-
 * trace-file on|off|flush|set <path>
   Enable/disable/flush the trace file or set the trace file name.
 
-==== Enabling/disabling trace events programmatically ====
-
-The st_change_trace_event_state() function can be used to enable or disable trace
-events at runtime inside QEMU:
-
-    #include "trace.h"
-    
-    st_change_trace_event_state("virtio_irq", true); /* enable */
-    [...]
-    st_change_trace_event_state("virtio_irq", false); /* disable */
-
 ==== Analyzing trace files ====
 
 The "simple" backend produces binary trace files that can be formatted with the
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 0ccfb2867f..9e1cca8e3d 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -180,13 +180,12 @@ STEXI
 Output logs to @var{filename}.
 ETEXI
 
-#ifdef CONFIG_SIMPLE_TRACE
     {
         .name       = "trace-event",
         .args_type  = "name:s,option:b",
         .params     = "name on|off",
         .help       = "changes status of a specific trace event",
-        .mhandler.cmd = do_change_trace_event_state,
+        .mhandler.cmd = do_trace_event_set_state,
     },
 
 STEXI
@@ -195,6 +194,7 @@ STEXI
 changes status of a trace event
 ETEXI
 
+#if defined(CONFIG_SIMPLE_TRACE)
     {
         .name       = "trace-file",
         .args_type  = "op:s?,arg:F?",
@@ -1354,14 +1354,17 @@ show roms
 @end table
 ETEXI
 
-#ifdef CONFIG_SIMPLE_TRACE
+#ifdef CONFIG_TRACE_SIMPLE
 STEXI
 @item info trace
 show contents of trace buffer
+ETEXI
+#endif
+
+STEXI
 @item info trace-events
 show available trace events and their state
 ETEXI
-#endif
 
 STEXI
 @end table
diff --git a/monitor.c b/monitor.c
index 04f465aa1c..df0f622067 100644
--- a/monitor.c
+++ b/monitor.c
@@ -57,9 +57,11 @@
 #include "json-parser.h"
 #include "osdep.h"
 #include "cpu.h"
-#ifdef CONFIG_SIMPLE_TRACE
-#include "trace.h"
+#include "trace/control.h"
+#ifdef CONFIG_TRACE_SIMPLE
+#include "trace/simple.h"
 #endif
+#include "trace/control.h"
 #include "ui/qemu-spice.h"
 
 //#define DEBUG
@@ -592,18 +594,18 @@ static void do_help_cmd(Monitor *mon, const QDict *qdict)
     help_cmd(mon, qdict_get_try_str(qdict, "name"));
 }
 
-#ifdef CONFIG_SIMPLE_TRACE
-static void do_change_trace_event_state(Monitor *mon, const QDict *qdict)
+static void do_trace_event_set_state(Monitor *mon, const QDict *qdict)
 {
     const char *tp_name = qdict_get_str(qdict, "name");
     bool new_state = qdict_get_bool(qdict, "option");
-    int ret = st_change_trace_event_state(tp_name, new_state);
+    int ret = trace_event_set_state(tp_name, new_state);
 
     if (!ret) {
         monitor_printf(mon, "unknown event name \"%s\"\n", tp_name);
     }
 }
 
+#ifdef CONFIG_SIMPLE_TRACE
 static void do_trace_file(Monitor *mon, const QDict *qdict)
 {
     const char *op = qdict_get_try_str(qdict, "op");
@@ -996,17 +998,17 @@ static void do_info_cpu_stats(Monitor *mon)
 }
 #endif
 
-#if defined(CONFIG_SIMPLE_TRACE)
+#if defined(CONFIG_TRACE_SIMPLE)
 static void do_info_trace(Monitor *mon)
 {
     st_print_trace((FILE *)mon, &monitor_fprintf);
 }
+#endif
 
-static void do_info_trace_events(Monitor *mon)
+static void do_trace_print_events(Monitor *mon)
 {
-    st_print_trace_events((FILE *)mon, &monitor_fprintf);
+    trace_print_events((FILE *)mon, &monitor_fprintf);
 }
-#endif
 
 /**
  * do_quit(): Quit QEMU execution
@@ -3135,7 +3137,7 @@ static const mon_cmd_t info_cmds[] = {
         .help       = "show roms",
         .mhandler.info = do_info_roms,
     },
-#if defined(CONFIG_SIMPLE_TRACE)
+#if defined(CONFIG_TRACE_SIMPLE)
     {
         .name       = "trace",
         .args_type  = "",
@@ -3143,14 +3145,14 @@ static const mon_cmd_t info_cmds[] = {
         .help       = "show current contents of trace buffer",
         .mhandler.info = do_info_trace,
     },
+#endif
     {
         .name       = "trace-events",
         .args_type  = "",
         .params     = "",
         .help       = "show available trace-events & their state",
-        .mhandler.info = do_info_trace_events,
+        .mhandler.info = do_trace_print_events,
     },
-#endif
     {
         .name       = NULL,
     },
diff --git a/qemu-config.c b/qemu-config.c
index 139e07768b..7a7854fd06 100644
--- a/qemu-config.c
+++ b/qemu-config.c
@@ -303,20 +303,21 @@ static QemuOptsList qemu_mon_opts = {
     },
 };
 
-#ifdef CONFIG_SIMPLE_TRACE
 static QemuOptsList qemu_trace_opts = {
     .name = "trace",
     .implied_opt_name = "trace",
     .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
     .desc = {
         {
+            .name = "events",
+            .type = QEMU_OPT_STRING,
+        },{
             .name = "file",
             .type = QEMU_OPT_STRING,
         },
         { /* end of list */ }
     },
 };
-#endif
 
 static QemuOptsList qemu_cpudef_opts = {
     .name = "cpudef",
@@ -517,9 +518,7 @@ static QemuOptsList *vm_config_groups[32] = {
     &qemu_global_opts,
     &qemu_mon_opts,
     &qemu_cpudef_opts,
-#ifdef CONFIG_SIMPLE_TRACE
     &qemu_trace_opts,
-#endif
     &qemu_option_rom_opts,
     &qemu_machine_opts,
     &qemu_boot_opts,
diff --git a/qemu-options.hx b/qemu-options.hx
index 35d95d1d89..f672365e42 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2436,17 +2436,32 @@ Normally QEMU loads a configuration file from @var{sysconfdir}/qemu.conf and
 @var{sysconfdir}/target-@var{ARCH}.conf on startup.  The @code{-nodefconfig}
 option will prevent QEMU from loading these configuration files at startup.
 ETEXI
-#ifdef CONFIG_SIMPLE_TRACE
 DEF("trace", HAS_ARG, QEMU_OPTION_trace,
-    "-trace\n"
-    "                Specify a trace file to log traces to\n",
+    "-trace [events=<file>][,file=<file>]\n"
+    "                specify tracing options\n",
     QEMU_ARCH_ALL)
 STEXI
-@item -trace
+HXCOMM This line is not accurate, as some sub-options are backend-specific but
+HXCOMM HX does not support conditional compilation of text.
+@item -trace [events=@var{file}][,file=@var{file}]
 @findex -trace
-Specify a trace file to log output traces to.
+
+Specify tracing options.
+
+@table @option
+@item events=@var{file}
+Immediately enable events listed in @var{file}.
+The file must contain one event name (as listed in the @var{trace-events} file)
+per line.
+
+This option is only available when using the @var{simple} and @var{stderr}
+tracing backends.
+@item file=@var{file}
+Log output traces to @var{file}.
+
+This option is only available when using the @var{simple} tracing backend.
+@end table
 ETEXI
-#endif
 
 HXCOMM This is the last statement. Insert new options before this line!
 STEXI
diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py
index 2ad56998ee..f55e5e63f9 100755
--- a/scripts/simpletrace.py
+++ b/scripts/simpletrace.py
@@ -102,10 +102,10 @@ def process(events, log, analyzer):
         fn_argcount = len(inspect.getargspec(fn)[0]) - 1
         if fn_argcount == event_argcount + 1:
             # Include timestamp as first argument
-            return lambda _, rec: fn(*rec[1:2 + fn_argcount])
+            return lambda _, rec: fn(*rec[1:2 + event_argcount])
         else:
             # Just arguments, no timestamp
-            return lambda _, rec: fn(*rec[2:2 + fn_argcount])
+            return lambda _, rec: fn(*rec[2:2 + event_argcount])
 
     analyzer.begin()
     fn_cache = {}
diff --git a/scripts/tracetool b/scripts/tracetool
index 2155a57df2..743d246289 100755
--- a/scripts/tracetool
+++ b/scripts/tracetool
@@ -43,7 +43,26 @@ EOF
 # Get the name of a trace event
 get_name()
 {
-    echo ${1%%\(*}
+    local name
+    name=${1%%\(*}
+    echo "${name##* }"
+}
+
+# Get the given property of a trace event
+# 1: trace-events line
+# 2: property name
+# -> return 0 if property is present, or 1 otherwise
+has_property()
+{
+    local props prop
+    props=${1%%\(*}
+    props=${props% *}
+    for prop in $props; do
+        if [ "$prop" = "$2" ]; then
+            return 0
+        fi
+    done
+    return 1
 }
 
 # Get the argument list of a trace event, including types and names
@@ -101,20 +120,6 @@ get_fmt()
     echo "$fmt"
 }
 
-# Get the state of a trace event
-get_state()
-{
-    local str disable state
-    str=$(get_name "$1")
-    disable=${str##disable }
-    if [ "$disable" = "$str" ] ; then
-        state=1
-    else
-        state=0
-    fi
-    echo "$state"
-}
-
 linetoh_begin_nop()
 {
     return
@@ -158,7 +163,7 @@ linetoc_end_nop()
 linetoh_begin_simple()
 {
     cat <<EOF
-#include "simpletrace.h"
+#include "trace/simple.h"
 EOF
 
     simple_event_num=0
@@ -174,14 +179,10 @@ cast_args_to_uint64_t()
 
 linetoh_simple()
 {
-    local name args argc trace_args state
+    local name args argc trace_args
     name=$(get_name "$1")
     args=$(get_args "$1")
     argc=$(get_argc "$1")
-    state=$(get_state "$1")
-    if [ "$state" = "0" ]; then
-        name=${name##disable }
-    fi
 
     trace_args="$simple_event_num"
     if [ "$argc" -gt 0 ]
@@ -220,14 +221,10 @@ EOF
 
 linetoc_simple()
 {
-    local name state
+    local name
     name=$(get_name "$1")
-    state=$(get_state "$1")
-    if [ "$state" = "0" ] ; then
-        name=${name##disable }
-    fi
     cat <<EOF
-{.tp_name = "$name", .state=$state},
+{.tp_name = "$name", .state=0},
 EOF
     simple_event_num=$((simple_event_num + 1))
 }
@@ -244,7 +241,12 @@ linetoh_begin_stderr()
 {
     cat <<EOF
 #include <stdio.h>
+#include "trace/stderr.h"
+
+extern TraceEvent trace_list[];
 EOF
+
+    stderr_event_num=0
 }
 
 linetoh_stderr()
@@ -263,29 +265,47 @@ linetoh_stderr()
     cat <<EOF
 static inline void trace_$name($args)
 {
-    fprintf(stderr, "$name $fmt\n" $argnames);
+    if (trace_list[$stderr_event_num].state != 0) {
+        fprintf(stderr, "$name $fmt\n" $argnames);
+    }
 }
 EOF
+    stderr_event_num=$((stderr_event_num + 1))
+
 }
 
 linetoh_end_stderr()
 {
-return
+    cat <<EOF
+#define NR_TRACE_EVENTS $stderr_event_num
+EOF
 }
 
 linetoc_begin_stderr()
 {
-return
+    cat <<EOF
+#include "trace.h"
+
+TraceEvent trace_list[] = {
+EOF
+    stderr_event_num=0
 }
 
 linetoc_stderr()
 {
-return
+    local name
+    name=$(get_name "$1")
+    cat <<EOF
+{.tp_name = "$name", .state=0},
+EOF
+    stderr_event_num=$(($stderr_event_num + 1))
 }
 
 linetoc_end_stderr()
 {
-return
+    cat <<EOF
+};
+EOF
 }
 #END OF STDERR
 
@@ -379,14 +399,10 @@ EOF
 
 linetoh_dtrace()
 {
-    local name args argnames state nameupper
+    local name args argnames nameupper
     name=$(get_name "$1")
     args=$(get_args "$1")
     argnames=$(get_argnames "$1", ",")
-    state=$(get_state "$1")
-    if [ "$state" = "0" ] ; then
-        name=${name##disable }
-    fi
 
     nameupper=`echo $name | tr '[:lower:]' '[:upper:]'`
 
@@ -430,13 +446,9 @@ EOF
 
 linetod_dtrace()
 {
-    local name args state
+    local name args
     name=$(get_name "$1")
     args=$(get_args "$1")
-    state=$(get_state "$1")
-    if [ "$state" = "0" ] ; then
-        name=${name##disable }
-    fi
 
     # DTrace provider syntax expects foo() for empty
     # params, not foo(void)
@@ -464,14 +476,10 @@ linetostap_begin_dtrace()
 
 linetostap_dtrace()
 {
-    local i arg name args arglist state
+    local i arg name args arglist
     name=$(get_name "$1")
     args=$(get_args "$1")
     arglist=$(get_argnames "$1", "")
-    state=$(get_state "$1")
-    if [ "$state" = "0" ] ; then
-        name=${name##disable }
-    fi
 
     # Define prototype for probe arguments
     cat <<EOF
@@ -516,18 +524,10 @@ convert()
         # Skip comments and empty lines
         test -z "${str%%#*}" && continue
 
-        # Process the line.  The nop backend handles disabled lines.
-        disable=${str%%disable *}
         echo
-        if test -z "$disable"; then
-            # Pass the disabled state as an arg for the simple
-            # or DTrace backends which handle it dynamically.
-            # For all other backends, call lineto$1_nop()
-            if [ $backend = "simple" -o "$backend" = "dtrace" ]; then
-                "$process_line" "$str"
-            else
-                "lineto$1_nop" "${str##disable }"
-            fi
+        # Process the line.  The nop backend handles disabled lines.
+        if has_property "$str" "disable"; then
+            "lineto$1_nop" "$str"
         else
             "$process_line" "$str"
         fi
diff --git a/tests/test_path.c b/tests/test_path.c
index 234ed97088..7265a9445d 100644
--- a/tests/test_path.c
+++ b/tests/test_path.c
@@ -4,7 +4,7 @@
 #include "../cutils.c"
 #include "../path.c"
 #include "../trace.c"
-#ifdef CONFIG_SIMPLE_TRACE
+#ifdef CONFIG_TRACE_SIMPLE
 #include "../simpletrace.c"
 #endif
 
diff --git a/trace-events b/trace-events
index f08d6d0b41..98f3ec2841 100644
--- a/trace-events
+++ b/trace-events
@@ -17,9 +17,6 @@
 # Example: qemu_malloc(size_t size) "size %zu"
 #
 # The "disable" keyword will build without the trace event.
-# In case of 'simple' trace backend, it will allow the trace event to be
-# compiled, but this would be turned off by default. It can be toggled on via
-# the monitor.
 #
 # The <name> must be a valid as a C function name.
 #
@@ -29,439 +26,439 @@
 # The <format-string> should be a sprintf()-compatible format string.
 
 # qemu-malloc.c
-disable qemu_malloc(size_t size, void *ptr) "size %zu ptr %p"
-disable qemu_realloc(void *ptr, size_t size, void *newptr) "ptr %p size %zu newptr %p"
-disable qemu_free(void *ptr) "ptr %p"
+qemu_malloc(size_t size, void *ptr) "size %zu ptr %p"
+qemu_realloc(void *ptr, size_t size, void *newptr) "ptr %p size %zu newptr %p"
+qemu_free(void *ptr) "ptr %p"
 
 # osdep.c
-disable qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
-disable qemu_vmalloc(size_t size, void *ptr) "size %zu ptr %p"
-disable qemu_vfree(void *ptr) "ptr %p"
+qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
+qemu_vmalloc(size_t size, void *ptr) "size %zu ptr %p"
+qemu_vfree(void *ptr) "ptr %p"
 
 # hw/virtio.c
-disable virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"
-disable virtqueue_flush(void *vq, unsigned int count) "vq %p count %u"
-disable virtqueue_pop(void *vq, void *elem, unsigned int in_num, unsigned int out_num) "vq %p elem %p in_num %u out_num %u"
-disable virtio_queue_notify(void *vdev, int n, void *vq) "vdev %p n %d vq %p"
-disable virtio_irq(void *vq) "vq %p"
-disable virtio_notify(void *vdev, void *vq) "vdev %p vq %p"
+virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"
+virtqueue_flush(void *vq, unsigned int count) "vq %p count %u"
+virtqueue_pop(void *vq, void *elem, unsigned int in_num, unsigned int out_num) "vq %p elem %p in_num %u out_num %u"
+virtio_queue_notify(void *vdev, int n, void *vq) "vdev %p n %d vq %p"
+virtio_irq(void *vq) "vq %p"
+virtio_notify(void *vdev, void *vq) "vdev %p vq %p"
 
 # hw/virtio-serial-bus.c
-disable virtio_serial_send_control_event(unsigned int port, uint16_t event, uint16_t value) "port %u, event %u, value %u"
-disable virtio_serial_throttle_port(unsigned int port, bool throttle) "port %u, throttle %d"
-disable virtio_serial_handle_control_message(uint16_t event, uint16_t value) "event %u, value %u"
-disable virtio_serial_handle_control_message_port(unsigned int port) "port %u"
+virtio_serial_send_control_event(unsigned int port, uint16_t event, uint16_t value) "port %u, event %u, value %u"
+virtio_serial_throttle_port(unsigned int port, bool throttle) "port %u, throttle %d"
+virtio_serial_handle_control_message(uint16_t event, uint16_t value) "event %u, value %u"
+virtio_serial_handle_control_message_port(unsigned int port) "port %u"
 
 # hw/virtio-console.c
-disable virtio_console_flush_buf(unsigned int port, size_t len, ssize_t ret) "port %u, in_len %zu, out_len %zd"
-disable virtio_console_chr_read(unsigned int port, int size) "port %u, size %d"
-disable virtio_console_chr_event(unsigned int port, int event) "port %u, event %d"
+virtio_console_flush_buf(unsigned int port, size_t len, ssize_t ret) "port %u, in_len %zu, out_len %zd"
+virtio_console_chr_read(unsigned int port, int size) "port %u, size %d"
+virtio_console_chr_event(unsigned int port, int event) "port %u, event %d"
 
 # block.c
-disable multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
-disable bdrv_aio_multiwrite(void *mcb, int num_callbacks, int num_reqs) "mcb %p num_callbacks %d num_reqs %d"
-disable bdrv_aio_multiwrite_earlyfail(void *mcb) "mcb %p"
-disable bdrv_aio_multiwrite_latefail(void *mcb, int i) "mcb %p i %d"
-disable bdrv_aio_flush(void *bs, void *opaque) "bs %p opaque %p"
-disable bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
-disable bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
-disable bdrv_set_locked(void *bs, int locked) "bs %p locked %d"
-disable bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
-disable bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
-disable bdrv_co_io(int is_write, void *acb) "is_write %d acb %p"
+multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
+bdrv_aio_multiwrite(void *mcb, int num_callbacks, int num_reqs) "mcb %p num_callbacks %d num_reqs %d"
+bdrv_aio_multiwrite_earlyfail(void *mcb) "mcb %p"
+bdrv_aio_multiwrite_latefail(void *mcb, int i) "mcb %p i %d"
+bdrv_aio_flush(void *bs, void *opaque) "bs %p opaque %p"
+bdrv_aio_readv(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+bdrv_aio_writev(void *bs, int64_t sector_num, int nb_sectors, void *opaque) "bs %p sector_num %"PRId64" nb_sectors %d opaque %p"
+bdrv_set_locked(void *bs, int locked) "bs %p locked %d"
+bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
+bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
+bdrv_co_io(int is_write, void *acb) "is_write %d acb %p"
 
 # hw/virtio-blk.c
-disable virtio_blk_req_complete(void *req, int status) "req %p status %d"
-disable virtio_blk_rw_complete(void *req, int ret) "req %p ret %d"
-disable virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu"
+virtio_blk_req_complete(void *req, int status) "req %p status %d"
+virtio_blk_rw_complete(void *req, int ret) "req %p ret %d"
+virtio_blk_handle_write(void *req, uint64_t sector, size_t nsectors) "req %p sector %"PRIu64" nsectors %zu"
 
 # posix-aio-compat.c
-disable paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
-disable paio_complete(void *acb, void *opaque, int ret) "acb %p opaque %p ret %d"
-disable paio_cancel(void *acb, void *opaque) "acb %p opaque %p"
+paio_submit(void *acb, void *opaque, int64_t sector_num, int nb_sectors, int type) "acb %p opaque %p sector_num %"PRId64" nb_sectors %d type %d"
+paio_complete(void *acb, void *opaque, int ret) "acb %p opaque %p ret %d"
+paio_cancel(void *acb, void *opaque) "acb %p opaque %p"
 
 # ioport.c
-disable cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"
-disable cpu_out(unsigned int addr, unsigned int val) "addr %#x value %u"
+cpu_in(unsigned int addr, unsigned int val) "addr %#x value %u"
+cpu_out(unsigned int addr, unsigned int val) "addr %#x value %u"
 
 # balloon.c
 # Since requests are raised via monitor, not many tracepoints are needed.
-disable balloon_event(void *opaque, unsigned long addr) "opaque %p addr %lu"
+balloon_event(void *opaque, unsigned long addr) "opaque %p addr %lu"
 
 # hw/apic.c
-disable apic_local_deliver(int vector, uint32_t lvt) "vector %d delivery mode %d"
-disable apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode, uint8_t vector_num, uint8_t trigger_mode) "dest %d dest_mode %d delivery_mode %d vector %d trigger_mode %d"
-disable cpu_set_apic_base(uint64_t val) "%016"PRIx64""
-disable cpu_get_apic_base(uint64_t val) "%016"PRIx64""
-disable apic_mem_readl(uint64_t addr, uint32_t val)  "%"PRIx64" = %08x"
-disable apic_mem_writel(uint64_t addr, uint32_t val) "%"PRIx64" = %08x"
+apic_local_deliver(int vector, uint32_t lvt) "vector %d delivery mode %d"
+apic_deliver_irq(uint8_t dest, uint8_t dest_mode, uint8_t delivery_mode, uint8_t vector_num, uint8_t trigger_mode) "dest %d dest_mode %d delivery_mode %d vector %d trigger_mode %d"
+cpu_set_apic_base(uint64_t val) "%016"PRIx64""
+cpu_get_apic_base(uint64_t val) "%016"PRIx64""
+apic_mem_readl(uint64_t addr, uint32_t val)  "%"PRIx64" = %08x"
+apic_mem_writel(uint64_t addr, uint32_t val) "%"PRIx64" = %08x"
 # coalescing
-disable apic_reset_irq_delivered(int apic_irq_delivered) "old coalescing %d"
-disable apic_get_irq_delivered(int apic_irq_delivered) "returning coalescing %d"
-disable apic_set_irq(int apic_irq_delivered) "coalescing %d"
+apic_reset_irq_delivered(int apic_irq_delivered) "old coalescing %d"
+apic_get_irq_delivered(int apic_irq_delivered) "returning coalescing %d"
+apic_set_irq(int apic_irq_delivered) "coalescing %d"
 
 # hw/cs4231.c
-disable cs4231_mem_readl_dreg(uint32_t reg, uint32_t ret) "read dreg %d: 0x%02x"
-disable cs4231_mem_readl_reg(uint32_t reg, uint32_t ret) "read reg %d: 0x%08x"
-disable cs4231_mem_writel_reg(uint32_t reg, uint32_t old, uint32_t val) "write reg %d: 0x%08x -> 0x%08x"
-disable cs4231_mem_writel_dreg(uint32_t reg, uint32_t old, uint32_t val) "write dreg %d: 0x%02x -> 0x%02x"
+cs4231_mem_readl_dreg(uint32_t reg, uint32_t ret) "read dreg %d: 0x%02x"
+cs4231_mem_readl_reg(uint32_t reg, uint32_t ret) "read reg %d: 0x%08x"
+cs4231_mem_writel_reg(uint32_t reg, uint32_t old, uint32_t val) "write reg %d: 0x%08x -> 0x%08x"
+cs4231_mem_writel_dreg(uint32_t reg, uint32_t old, uint32_t val) "write dreg %d: 0x%02x -> 0x%02x"
 
 # hw/ds1225y.c
-disable nvram_read(uint32_t addr, uint32_t ret) "read addr %d: 0x%02x"
-disable nvram_write(uint32_t addr, uint32_t old, uint32_t val) "write addr %d: 0x%02x -> 0x%02x"
+nvram_read(uint32_t addr, uint32_t ret) "read addr %d: 0x%02x"
+nvram_write(uint32_t addr, uint32_t old, uint32_t val) "write addr %d: 0x%02x -> 0x%02x"
 
 # hw/eccmemctl.c
-disable ecc_mem_writel_mer(uint32_t val) "Write memory enable %08x"
-disable ecc_mem_writel_mdr(uint32_t val) "Write memory delay %08x"
-disable ecc_mem_writel_mfsr(uint32_t val) "Write memory fault status %08x"
-disable ecc_mem_writel_vcr(uint32_t val) "Write slot configuration %08x"
-disable ecc_mem_writel_dr(uint32_t val) "Write diagnostic %08x"
-disable ecc_mem_writel_ecr0(uint32_t val) "Write event count 1 %08x"
-disable ecc_mem_writel_ecr1(uint32_t val) "Write event count 2 %08x"
-disable ecc_mem_readl_mer(uint32_t ret) "Read memory enable %08x"
-disable ecc_mem_readl_mdr(uint32_t ret) "Read memory delay %08x"
-disable ecc_mem_readl_mfsr(uint32_t ret) "Read memory fault status %08x"
-disable ecc_mem_readl_vcr(uint32_t ret) "Read slot configuration %08x"
-disable ecc_mem_readl_mfar0(uint32_t ret) "Read memory fault address 0 %08x"
-disable ecc_mem_readl_mfar1(uint32_t ret) "Read memory fault address 1 %08x"
-disable ecc_mem_readl_dr(uint32_t ret) "Read diagnostic %08x"
-disable ecc_mem_readl_ecr0(uint32_t ret) "Read event count 1 %08x"
-disable ecc_mem_readl_ecr1(uint32_t ret) "Read event count 2 %08x"
-disable ecc_diag_mem_writeb(uint64_t addr, uint32_t val) "Write diagnostic %"PRId64" = %02x"
-disable ecc_diag_mem_readb(uint64_t addr, uint32_t ret) "Read diagnostic %"PRId64"= %02x"
+ecc_mem_writel_mer(uint32_t val) "Write memory enable %08x"
+ecc_mem_writel_mdr(uint32_t val) "Write memory delay %08x"
+ecc_mem_writel_mfsr(uint32_t val) "Write memory fault status %08x"
+ecc_mem_writel_vcr(uint32_t val) "Write slot configuration %08x"
+ecc_mem_writel_dr(uint32_t val) "Write diagnostic %08x"
+ecc_mem_writel_ecr0(uint32_t val) "Write event count 1 %08x"
+ecc_mem_writel_ecr1(uint32_t val) "Write event count 2 %08x"
+ecc_mem_readl_mer(uint32_t ret) "Read memory enable %08x"
+ecc_mem_readl_mdr(uint32_t ret) "Read memory delay %08x"
+ecc_mem_readl_mfsr(uint32_t ret) "Read memory fault status %08x"
+ecc_mem_readl_vcr(uint32_t ret) "Read slot configuration %08x"
+ecc_mem_readl_mfar0(uint32_t ret) "Read memory fault address 0 %08x"
+ecc_mem_readl_mfar1(uint32_t ret) "Read memory fault address 1 %08x"
+ecc_mem_readl_dr(uint32_t ret) "Read diagnostic %08x"
+ecc_mem_readl_ecr0(uint32_t ret) "Read event count 1 %08x"
+ecc_mem_readl_ecr1(uint32_t ret) "Read event count 2 %08x"
+ecc_diag_mem_writeb(uint64_t addr, uint32_t val) "Write diagnostic %"PRId64" = %02x"
+ecc_diag_mem_readb(uint64_t addr, uint32_t ret) "Read diagnostic %"PRId64"= %02x"
 
 # hw/lance.c
-disable lance_mem_readw(uint64_t addr, uint32_t ret) "addr=%"PRIx64"val=0x%04x"
-disable lance_mem_writew(uint64_t addr, uint32_t val) "addr=%"PRIx64"val=0x%04x"
+lance_mem_readw(uint64_t addr, uint32_t ret) "addr=%"PRIx64"val=0x%04x"
+lance_mem_writew(uint64_t addr, uint32_t val) "addr=%"PRIx64"val=0x%04x"
 
 # hw/slavio_intctl.c
-disable slavio_intctl_mem_readl(uint32_t cpu, uint64_t addr, uint32_t ret) "read cpu %d reg 0x%"PRIx64" = %x"
-disable slavio_intctl_mem_writel(uint32_t cpu, uint64_t addr, uint32_t val) "write cpu %d reg 0x%"PRIx64" = %x"
-disable slavio_intctl_mem_writel_clear(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Cleared cpu %d irq mask %x, curmask %x"
-disable slavio_intctl_mem_writel_set(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Set cpu %d irq mask %x, curmask %x"
-disable slavio_intctlm_mem_readl(uint64_t addr, uint32_t ret) "read system reg 0x%"PRIx64" = %x"
-disable slavio_intctlm_mem_writel(uint64_t addr, uint32_t val) "write system reg 0x%"PRIx64" = %x"
-disable slavio_intctlm_mem_writel_enable(uint32_t val, uint32_t intregm_disabled) "Enabled master irq mask %x, curmask %x"
-disable slavio_intctlm_mem_writel_disable(uint32_t val, uint32_t intregm_disabled) "Disabled master irq mask %x, curmask %x"
-disable slavio_intctlm_mem_writel_target(uint32_t cpu) "Set master irq cpu %d"
-disable slavio_check_interrupts(uint32_t pending, uint32_t intregm_disabled) "pending %x disabled %x"
-disable slavio_set_irq(uint32_t target_cpu, int irq, uint32_t pil, int level) "Set cpu %d irq %d -> pil %d level %d"
-disable slavio_set_timer_irq_cpu(int cpu, int level) "Set cpu %d local timer level %d"
+slavio_intctl_mem_readl(uint32_t cpu, uint64_t addr, uint32_t ret) "read cpu %d reg 0x%"PRIx64" = %x"
+slavio_intctl_mem_writel(uint32_t cpu, uint64_t addr, uint32_t val) "write cpu %d reg 0x%"PRIx64" = %x"
+slavio_intctl_mem_writel_clear(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Cleared cpu %d irq mask %x, curmask %x"
+slavio_intctl_mem_writel_set(uint32_t cpu, uint32_t val, uint32_t intreg_pending) "Set cpu %d irq mask %x, curmask %x"
+slavio_intctlm_mem_readl(uint64_t addr, uint32_t ret) "read system reg 0x%"PRIx64" = %x"
+slavio_intctlm_mem_writel(uint64_t addr, uint32_t val) "write system reg 0x%"PRIx64" = %x"
+slavio_intctlm_mem_writel_enable(uint32_t val, uint32_t intregm_disabled) "Enabled master irq mask %x, curmask %x"
+slavio_intctlm_mem_writel_disable(uint32_t val, uint32_t intregm_disabled) "Disabled master irq mask %x, curmask %x"
+slavio_intctlm_mem_writel_target(uint32_t cpu) "Set master irq cpu %d"
+slavio_check_interrupts(uint32_t pending, uint32_t intregm_disabled) "pending %x disabled %x"
+slavio_set_irq(uint32_t target_cpu, int irq, uint32_t pil, int level) "Set cpu %d irq %d -> pil %d level %d"
+slavio_set_timer_irq_cpu(int cpu, int level) "Set cpu %d local timer level %d"
 
 # hw/slavio_misc.c
-disable slavio_misc_update_irq_raise(void) "Raise IRQ"
-disable slavio_misc_update_irq_lower(void) "Lower IRQ"
-disable slavio_set_power_fail(int power_failing, uint8_t config) "Power fail: %d, config: %d"
-disable slavio_cfg_mem_writeb(uint32_t val) "Write config %02x"
-disable slavio_cfg_mem_readb(uint32_t ret) "Read config %02x"
-disable slavio_diag_mem_writeb(uint32_t val) "Write diag %02x"
-disable slavio_diag_mem_readb(uint32_t ret) "Read diag %02x"
-disable slavio_mdm_mem_writeb(uint32_t val) "Write modem control %02x"
-disable slavio_mdm_mem_readb(uint32_t ret) "Read modem control %02x"
-disable slavio_aux1_mem_writeb(uint32_t val) "Write aux1 %02x"
-disable slavio_aux1_mem_readb(uint32_t ret) "Read aux1 %02x"
-disable slavio_aux2_mem_writeb(uint32_t val) "Write aux2 %02x"
-disable slavio_aux2_mem_readb(uint32_t ret) "Read aux2 %02x"
-disable apc_mem_writeb(uint32_t val) "Write power management %02x"
-disable apc_mem_readb(uint32_t ret) "Read power management %02x"
-disable slavio_sysctrl_mem_writel(uint32_t val) "Write system control %08x"
-disable slavio_sysctrl_mem_readl(uint32_t ret) "Read system control %08x"
-disable slavio_led_mem_writew(uint32_t val) "Write diagnostic LED %04x"
-disable slavio_led_mem_readw(uint32_t ret) "Read diagnostic LED %04x"
+slavio_misc_update_irq_raise(void) "Raise IRQ"
+slavio_misc_update_irq_lower(void) "Lower IRQ"
+slavio_set_power_fail(int power_failing, uint8_t config) "Power fail: %d, config: %d"
+slavio_cfg_mem_writeb(uint32_t val) "Write config %02x"
+slavio_cfg_mem_readb(uint32_t ret) "Read config %02x"
+slavio_diag_mem_writeb(uint32_t val) "Write diag %02x"
+slavio_diag_mem_readb(uint32_t ret) "Read diag %02x"
+slavio_mdm_mem_writeb(uint32_t val) "Write modem control %02x"
+slavio_mdm_mem_readb(uint32_t ret) "Read modem control %02x"
+slavio_aux1_mem_writeb(uint32_t val) "Write aux1 %02x"
+slavio_aux1_mem_readb(uint32_t ret) "Read aux1 %02x"
+slavio_aux2_mem_writeb(uint32_t val) "Write aux2 %02x"
+slavio_aux2_mem_readb(uint32_t ret) "Read aux2 %02x"
+apc_mem_writeb(uint32_t val) "Write power management %02x"
+apc_mem_readb(uint32_t ret) "Read power management %02x"
+slavio_sysctrl_mem_writel(uint32_t val) "Write system control %08x"
+slavio_sysctrl_mem_readl(uint32_t ret) "Read system control %08x"
+slavio_led_mem_writew(uint32_t val) "Write diagnostic LED %04x"
+slavio_led_mem_readw(uint32_t ret) "Read diagnostic LED %04x"
 
 # hw/slavio_timer.c
-disable slavio_timer_get_out(uint64_t limit, uint32_t counthigh, uint32_t count) "limit %"PRIx64" count %x%08x"
-disable slavio_timer_irq(uint32_t counthigh, uint32_t count) "callback: count %x%08x"
-disable slavio_timer_mem_readl_invalid(uint64_t addr) "invalid read address %"PRIx64""
-disable slavio_timer_mem_readl(uint64_t addr, uint32_t ret) "read %"PRIx64" = %08x"
-disable slavio_timer_mem_writel(uint64_t addr, uint32_t val) "write %"PRIx64" = %08x"
-disable slavio_timer_mem_writel_limit(unsigned int timer_index, uint64_t count) "processor %d user timer set to %016"PRIx64""
-disable slavio_timer_mem_writel_counter_invalid(void) "not user timer"
-disable slavio_timer_mem_writel_status_start(unsigned int timer_index) "processor %d user timer started"
-disable slavio_timer_mem_writel_status_stop(unsigned int timer_index) "processor %d user timer stopped"
-disable slavio_timer_mem_writel_mode_user(unsigned int timer_index) "processor %d changed from counter to user timer"
-disable slavio_timer_mem_writel_mode_counter(unsigned int timer_index) "processor %d changed from user timer to counter"
-disable slavio_timer_mem_writel_mode_invalid(void) "not system timer"
-disable slavio_timer_mem_writel_invalid(uint64_t addr) "invalid write address %"PRIx64""
+slavio_timer_get_out(uint64_t limit, uint32_t counthigh, uint32_t count) "limit %"PRIx64" count %x%08x"
+slavio_timer_irq(uint32_t counthigh, uint32_t count) "callback: count %x%08x"
+slavio_timer_mem_readl_invalid(uint64_t addr) "invalid read address %"PRIx64""
+slavio_timer_mem_readl(uint64_t addr, uint32_t ret) "read %"PRIx64" = %08x"
+slavio_timer_mem_writel(uint64_t addr, uint32_t val) "write %"PRIx64" = %08x"
+slavio_timer_mem_writel_limit(unsigned int timer_index, uint64_t count) "processor %d user timer set to %016"PRIx64""
+slavio_timer_mem_writel_counter_invalid(void) "not user timer"
+slavio_timer_mem_writel_status_start(unsigned int timer_index) "processor %d user timer started"
+slavio_timer_mem_writel_status_stop(unsigned int timer_index) "processor %d user timer stopped"
+slavio_timer_mem_writel_mode_user(unsigned int timer_index) "processor %d changed from counter to user timer"
+slavio_timer_mem_writel_mode_counter(unsigned int timer_index) "processor %d changed from user timer to counter"
+slavio_timer_mem_writel_mode_invalid(void) "not system timer"
+slavio_timer_mem_writel_invalid(uint64_t addr) "invalid write address %"PRIx64""
 
 # hw/sparc32_dma.c
-disable ledma_memory_read(uint64_t addr) "DMA read addr 0x%"PRIx64""
-disable ledma_memory_write(uint64_t addr) "DMA write addr 0x%"PRIx64""
-disable sparc32_dma_set_irq_raise(void) "Raise IRQ"
-disable sparc32_dma_set_irq_lower(void) "Lower IRQ"
-disable espdma_memory_read(uint32_t addr) "DMA read addr 0x%08x"
-disable espdma_memory_write(uint32_t addr) "DMA write addr 0x%08x"
-disable sparc32_dma_mem_readl(uint64_t addr, uint32_t ret) "read dmareg %"PRIx64": 0x%08x"
-disable sparc32_dma_mem_writel(uint64_t addr, uint32_t old, uint32_t val) "write dmareg %"PRIx64": 0x%08x -> 0x%08x"
-disable sparc32_dma_enable_raise(void) "Raise DMA enable"
-disable sparc32_dma_enable_lower(void) "Lower DMA enable"
+ledma_memory_read(uint64_t addr) "DMA read addr 0x%"PRIx64""
+ledma_memory_write(uint64_t addr) "DMA write addr 0x%"PRIx64""
+sparc32_dma_set_irq_raise(void) "Raise IRQ"
+sparc32_dma_set_irq_lower(void) "Lower IRQ"
+espdma_memory_read(uint32_t addr) "DMA read addr 0x%08x"
+espdma_memory_write(uint32_t addr) "DMA write addr 0x%08x"
+sparc32_dma_mem_readl(uint64_t addr, uint32_t ret) "read dmareg %"PRIx64": 0x%08x"
+sparc32_dma_mem_writel(uint64_t addr, uint32_t old, uint32_t val) "write dmareg %"PRIx64": 0x%08x -> 0x%08x"
+sparc32_dma_enable_raise(void) "Raise DMA enable"
+sparc32_dma_enable_lower(void) "Lower DMA enable"
 
 # hw/sun4m.c
-disable sun4m_cpu_interrupt(unsigned int level) "Set CPU IRQ %d"
-disable sun4m_cpu_reset_interrupt(unsigned int level) "Reset CPU IRQ %d"
-disable sun4m_cpu_set_irq_raise(int level) "Raise CPU IRQ %d"
-disable sun4m_cpu_set_irq_lower(int level) "Lower CPU IRQ %d"
+sun4m_cpu_interrupt(unsigned int level) "Set CPU IRQ %d"
+sun4m_cpu_reset_interrupt(unsigned int level) "Reset CPU IRQ %d"
+sun4m_cpu_set_irq_raise(int level) "Raise CPU IRQ %d"
+sun4m_cpu_set_irq_lower(int level) "Lower CPU IRQ %d"
 
 # hw/sun4m_iommu.c
-disable sun4m_iommu_mem_readl(uint64_t addr, uint32_t ret) "read reg[%"PRIx64"] = %x"
-disable sun4m_iommu_mem_writel(uint64_t addr, uint32_t val) "write reg[%"PRIx64"] = %x"
-disable sun4m_iommu_mem_writel_ctrl(uint64_t iostart) "iostart = %"PRIx64""
-disable sun4m_iommu_mem_writel_tlbflush(uint32_t val) "tlb flush %x"
-disable sun4m_iommu_mem_writel_pgflush(uint32_t val) "page flush %x"
-disable sun4m_iommu_page_get_flags(uint64_t pa, uint64_t iopte, uint32_t ret) "get flags addr %"PRIx64" => pte %"PRIx64", *pte = %x"
-disable sun4m_iommu_translate_pa(uint64_t addr, uint64_t pa, uint32_t iopte) "xlate dva %"PRIx64" => pa %"PRIx64" iopte = %x"
-disable sun4m_iommu_bad_addr(uint64_t addr) "bad addr %"PRIx64""
+sun4m_iommu_mem_readl(uint64_t addr, uint32_t ret) "read reg[%"PRIx64"] = %x"
+sun4m_iommu_mem_writel(uint64_t addr, uint32_t val) "write reg[%"PRIx64"] = %x"
+sun4m_iommu_mem_writel_ctrl(uint64_t iostart) "iostart = %"PRIx64""
+sun4m_iommu_mem_writel_tlbflush(uint32_t val) "tlb flush %x"
+sun4m_iommu_mem_writel_pgflush(uint32_t val) "page flush %x"
+sun4m_iommu_page_get_flags(uint64_t pa, uint64_t iopte, uint32_t ret) "get flags addr %"PRIx64" => pte %"PRIx64", *pte = %x"
+sun4m_iommu_translate_pa(uint64_t addr, uint64_t pa, uint32_t iopte) "xlate dva %"PRIx64" => pa %"PRIx64" iopte = %x"
+sun4m_iommu_bad_addr(uint64_t addr) "bad addr %"PRIx64""
 
 # hw/usb-ehci.c
-disable usb_ehci_reset(void) "=== RESET ==="
-disable usb_ehci_mmio_readl(uint32_t addr, const char *str, uint32_t val) "rd mmio %04x [%s] = %x"
-disable usb_ehci_mmio_writel(uint32_t addr, const char *str, uint32_t val) "wr mmio %04x [%s] = %x"
-disable usb_ehci_mmio_change(uint32_t addr, const char *str, uint32_t new, uint32_t old) "ch mmio %04x [%s] = %x (old: %x)"
-disable usb_ehci_usbsts(const char *sts, int state) "usbsts %s %d"
-disable usb_ehci_state(const char *schedule, const char *state) "%s schedule %s"
-disable usb_ehci_qh_ptrs(void *q, uint32_t addr, uint32_t nxt, uint32_t c_qtd, uint32_t n_qtd, uint32_t a_qtd) "q %p - QH @ %08x: next %08x qtds %08x,%08x,%08x"
-disable usb_ehci_qh_fields(uint32_t addr, int rl, int mplen, int eps, int ep, int devaddr) "QH @ %08x - rl %d, mplen %d, eps %d, ep %d, dev %d"
-disable usb_ehci_qh_bits(uint32_t addr, int c, int h, int dtc, int i) "QH @ %08x - c %d, h %d, dtc %d, i %d"
-disable usb_ehci_qtd_ptrs(void *q, uint32_t addr, uint32_t nxt, uint32_t altnext) "q %p - QTD @ %08x: next %08x altnext %08x"
-disable usb_ehci_qtd_fields(uint32_t addr, int tbytes, int cpage, int cerr, int pid) "QTD @ %08x - tbytes %d, cpage %d, cerr %d, pid %d"
-disable usb_ehci_qtd_bits(uint32_t addr, int ioc, int active, int halt, int babble, int xacterr) "QTD @ %08x - ioc %d, active %d, halt %d, babble %d, xacterr %d"
-disable usb_ehci_itd(uint32_t addr, uint32_t nxt, uint32_t mplen, uint32_t mult, uint32_t ep, uint32_t devaddr) "ITD @ %08x: next %08x - mplen %d, mult %d, ep %d, dev %d"
-disable usb_ehci_port_attach(uint32_t port, const char *device) "attach port #%d - %s"
-disable usb_ehci_port_detach(uint32_t port) "detach port #%d"
-disable usb_ehci_port_reset(uint32_t port, int enable) "reset port #%d - %d"
-disable usb_ehci_data(int rw, uint32_t cpage, uint32_t offset, uint32_t addr, uint32_t len, uint32_t bufpos) "write %d, cpage %d, offset 0x%03x, addr 0x%08x, len %d, bufpos %d"
-disable usb_ehci_queue_action(void *q, const char *action) "q %p: %s"
+usb_ehci_reset(void) "=== RESET ==="
+usb_ehci_mmio_readl(uint32_t addr, const char *str, uint32_t val) "rd mmio %04x [%s] = %x"
+usb_ehci_mmio_writel(uint32_t addr, const char *str, uint32_t val) "wr mmio %04x [%s] = %x"
+usb_ehci_mmio_change(uint32_t addr, const char *str, uint32_t new, uint32_t old) "ch mmio %04x [%s] = %x (old: %x)"
+usb_ehci_usbsts(const char *sts, int state) "usbsts %s %d"
+usb_ehci_state(const char *schedule, const char *state) "%s schedule %s"
+usb_ehci_qh_ptrs(void *q, uint32_t addr, uint32_t nxt, uint32_t c_qtd, uint32_t n_qtd, uint32_t a_qtd) "q %p - QH @ %08x: next %08x qtds %08x,%08x,%08x"
+usb_ehci_qh_fields(uint32_t addr, int rl, int mplen, int eps, int ep, int devaddr) "QH @ %08x - rl %d, mplen %d, eps %d, ep %d, dev %d"
+usb_ehci_qh_bits(uint32_t addr, int c, int h, int dtc, int i) "QH @ %08x - c %d, h %d, dtc %d, i %d"
+usb_ehci_qtd_ptrs(void *q, uint32_t addr, uint32_t nxt, uint32_t altnext) "q %p - QTD @ %08x: next %08x altnext %08x"
+usb_ehci_qtd_fields(uint32_t addr, int tbytes, int cpage, int cerr, int pid) "QTD @ %08x - tbytes %d, cpage %d, cerr %d, pid %d"
+usb_ehci_qtd_bits(uint32_t addr, int ioc, int active, int halt, int babble, int xacterr) "QTD @ %08x - ioc %d, active %d, halt %d, babble %d, xacterr %d"
+usb_ehci_itd(uint32_t addr, uint32_t nxt, uint32_t mplen, uint32_t mult, uint32_t ep, uint32_t devaddr) "ITD @ %08x: next %08x - mplen %d, mult %d, ep %d, dev %d"
+usb_ehci_port_attach(uint32_t port, const char *device) "attach port #%d - %s"
+usb_ehci_port_detach(uint32_t port) "detach port #%d"
+usb_ehci_port_reset(uint32_t port, int enable) "reset port #%d - %d"
+usb_ehci_data(int rw, uint32_t cpage, uint32_t offset, uint32_t addr, uint32_t len, uint32_t bufpos) "write %d, cpage %d, offset 0x%03x, addr 0x%08x, len %d, bufpos %d"
+usb_ehci_queue_action(void *q, const char *action) "q %p: %s"
 
 # hw/usb-desc.c
-disable usb_desc_device(int addr, int len, int ret) "dev %d query device, len %d, ret %d"
-disable usb_desc_device_qualifier(int addr, int len, int ret) "dev %d query device qualifier, len %d, ret %d"
-disable usb_desc_config(int addr, int index, int len, int ret) "dev %d query config %d, len %d, ret %d"
-disable usb_desc_other_speed_config(int addr, int index, int len, int ret) "dev %d query config %d, len %d, ret %d"
-disable usb_desc_string(int addr, int index, int len, int ret) "dev %d query string %d, len %d, ret %d"
-disable usb_set_addr(int addr) "dev %d"
-disable usb_set_config(int addr, int config, int ret) "dev %d, config %d, ret %d"
-disable usb_clear_device_feature(int addr, int feature, int ret) "dev %d, feature %d, ret %d"
-disable usb_set_device_feature(int addr, int feature, int ret) "dev %d, feature %d, ret %d"
+usb_desc_device(int addr, int len, int ret) "dev %d query device, len %d, ret %d"
+usb_desc_device_qualifier(int addr, int len, int ret) "dev %d query device qualifier, len %d, ret %d"
+usb_desc_config(int addr, int index, int len, int ret) "dev %d query config %d, len %d, ret %d"
+usb_desc_other_speed_config(int addr, int index, int len, int ret) "dev %d query config %d, len %d, ret %d"
+usb_desc_string(int addr, int index, int len, int ret) "dev %d query string %d, len %d, ret %d"
+usb_set_addr(int addr) "dev %d"
+usb_set_config(int addr, int config, int ret) "dev %d, config %d, ret %d"
+usb_clear_device_feature(int addr, int feature, int ret) "dev %d, feature %d, ret %d"
+usb_set_device_feature(int addr, int feature, int ret) "dev %d, feature %d, ret %d"
 
 # hw/scsi-bus.c
-disable scsi_req_alloc(int target, int lun, int tag) "target %d lun %d tag %d"
-disable scsi_req_data(int target, int lun, int tag, int len) "target %d lun %d tag %d len %d"
-disable scsi_req_dequeue(int target, int lun, int tag) "target %d lun %d tag %d"
-disable scsi_req_continue(int target, int lun, int tag) "target %d lun %d tag %d"
-disable scsi_req_parsed(int target, int lun, int tag, int cmd, int mode, int xfer) "target %d lun %d tag %d command %d dir %d length %d"
-disable scsi_req_parsed_lba(int target, int lun, int tag, int cmd, uint64_t lba) "target %d lun %d tag %d command %d lba %"PRIu64""
-disable scsi_req_parse_bad(int target, int lun, int tag, int cmd) "target %d lun %d tag %d command %d"
-disable scsi_req_build_sense(int target, int lun, int tag, int key, int asc, int ascq) "target %d lun %d tag %d key %#02x asc %#02x ascq %#02x"
-disable scsi_report_luns(int target, int lun, int tag) "target %d lun %d tag %d"
-disable scsi_inquiry(int target, int lun, int tag, int cdb1, int cdb2) "target %d lun %d tag %d page %#02x/%#02x"
-disable scsi_test_unit_ready(int target, int lun, int tag) "target %d lun %d tag %d"
-disable scsi_request_sense(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_req_alloc(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_req_data(int target, int lun, int tag, int len) "target %d lun %d tag %d len %d"
+scsi_req_dequeue(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_req_continue(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_req_parsed(int target, int lun, int tag, int cmd, int mode, int xfer) "target %d lun %d tag %d command %d dir %d length %d"
+scsi_req_parsed_lba(int target, int lun, int tag, int cmd, uint64_t lba) "target %d lun %d tag %d command %d lba %"PRIu64""
+scsi_req_parse_bad(int target, int lun, int tag, int cmd) "target %d lun %d tag %d command %d"
+scsi_req_build_sense(int target, int lun, int tag, int key, int asc, int ascq) "target %d lun %d tag %d key %#02x asc %#02x ascq %#02x"
+scsi_report_luns(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_inquiry(int target, int lun, int tag, int cdb1, int cdb2) "target %d lun %d tag %d page %#02x/%#02x"
+scsi_test_unit_ready(int target, int lun, int tag) "target %d lun %d tag %d"
+scsi_request_sense(int target, int lun, int tag) "target %d lun %d tag %d"
 
 # vl.c
-disable vm_state_notify(int running, int reason) "running %d reason %d"
+vm_state_notify(int running, int reason) "running %d reason %d"
 
 # block/qed-l2-cache.c
-disable qed_alloc_l2_cache_entry(void *l2_cache, void *entry) "l2_cache %p entry %p"
-disable qed_unref_l2_cache_entry(void *entry, int ref) "entry %p ref %d"
-disable qed_find_l2_cache_entry(void *l2_cache, void *entry, uint64_t offset, int ref) "l2_cache %p entry %p offset %"PRIu64" ref %d"
+qed_alloc_l2_cache_entry(void *l2_cache, void *entry) "l2_cache %p entry %p"
+qed_unref_l2_cache_entry(void *entry, int ref) "entry %p ref %d"
+qed_find_l2_cache_entry(void *l2_cache, void *entry, uint64_t offset, int ref) "l2_cache %p entry %p offset %"PRIu64" ref %d"
 
 # block/qed-table.c
-disable qed_read_table(void *s, uint64_t offset, void *table) "s %p offset %"PRIu64" table %p"
-disable qed_read_table_cb(void *s, void *table, int ret) "s %p table %p ret %d"
-disable qed_write_table(void *s, uint64_t offset, void *table, unsigned int index, unsigned int n) "s %p offset %"PRIu64" table %p index %u n %u"
-disable qed_write_table_cb(void *s, void *table, int flush, int ret) "s %p table %p flush %d ret %d"
+qed_read_table(void *s, uint64_t offset, void *table) "s %p offset %"PRIu64" table %p"
+qed_read_table_cb(void *s, void *table, int ret) "s %p table %p ret %d"
+qed_write_table(void *s, uint64_t offset, void *table, unsigned int index, unsigned int n) "s %p offset %"PRIu64" table %p index %u n %u"
+qed_write_table_cb(void *s, void *table, int flush, int ret) "s %p table %p flush %d ret %d"
 
 # block/qed.c
-disable qed_need_check_timer_cb(void *s) "s %p"
-disable qed_start_need_check_timer(void *s) "s %p"
-disable qed_cancel_need_check_timer(void *s) "s %p"
-disable qed_aio_complete(void *s, void *acb, int ret) "s %p acb %p ret %d"
-disable qed_aio_setup(void *s, void *acb, int64_t sector_num, int nb_sectors, void *opaque, int is_write) "s %p acb %p sector_num %"PRId64" nb_sectors %d opaque %p is_write %d"
-disable qed_aio_next_io(void *s, void *acb, int ret, uint64_t cur_pos) "s %p acb %p ret %d cur_pos %"PRIu64""
-disable qed_aio_read_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
-disable qed_aio_write_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
-disable qed_aio_write_prefill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64""
-disable qed_aio_write_postfill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64""
-disable qed_aio_write_main(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
+qed_need_check_timer_cb(void *s) "s %p"
+qed_start_need_check_timer(void *s) "s %p"
+qed_cancel_need_check_timer(void *s) "s %p"
+qed_aio_complete(void *s, void *acb, int ret) "s %p acb %p ret %d"
+qed_aio_setup(void *s, void *acb, int64_t sector_num, int nb_sectors, void *opaque, int is_write) "s %p acb %p sector_num %"PRId64" nb_sectors %d opaque %p is_write %d"
+qed_aio_next_io(void *s, void *acb, int ret, uint64_t cur_pos) "s %p acb %p ret %d cur_pos %"PRIu64""
+qed_aio_read_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
+qed_aio_write_data(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
+qed_aio_write_prefill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64""
+qed_aio_write_postfill(void *s, void *acb, uint64_t start, size_t len, uint64_t offset) "s %p acb %p start %"PRIu64" len %zu offset %"PRIu64""
+qed_aio_write_main(void *s, void *acb, int ret, uint64_t offset, size_t len) "s %p acb %p ret %d offset %"PRIu64" len %zu"
 
 # hw/g364fb.c
-disable g364fb_read(uint64_t addr, uint32_t val) "read addr=0x%"PRIx64": 0x%x"
-disable g364fb_write(uint64_t addr, uint32_t new) "write addr=0x%"PRIx64": 0x%x"
+g364fb_read(uint64_t addr, uint32_t val) "read addr=0x%"PRIx64": 0x%x"
+g364fb_write(uint64_t addr, uint32_t new) "write addr=0x%"PRIx64": 0x%x"
 
 # hw/grlib_gptimer.c
-disable grlib_gptimer_enable(int id, uint32_t count) "timer:%d set count 0x%x and run"
-disable grlib_gptimer_disabled(int id, uint32_t config) "timer:%d Timer disable config 0x%x"
-disable grlib_gptimer_restart(int id, uint32_t reload) "timer:%d reload val: 0x%x"
-disable grlib_gptimer_set_scaler(uint32_t scaler, uint32_t freq) "scaler:0x%x freq: 0x%x"
-disable grlib_gptimer_hit(int id) "timer:%d HIT"
-disable grlib_gptimer_readl(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
-disable grlib_gptimer_writel(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
+grlib_gptimer_enable(int id, uint32_t count) "timer:%d set count 0x%x and run"
+grlib_gptimer_disabled(int id, uint32_t config) "timer:%d Timer disable config 0x%x"
+grlib_gptimer_restart(int id, uint32_t reload) "timer:%d reload val: 0x%x"
+grlib_gptimer_set_scaler(uint32_t scaler, uint32_t freq) "scaler:0x%x freq: 0x%x"
+grlib_gptimer_hit(int id) "timer:%d HIT"
+grlib_gptimer_readl(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
+grlib_gptimer_writel(int id, uint64_t addr, uint32_t val) "timer:%d addr 0x%"PRIx64" 0x%x"
 
 # hw/grlib_irqmp.c
-disable grlib_irqmp_check_irqs(uint32_t pend, uint32_t force, uint32_t mask, uint32_t lvl1, uint32_t lvl2) "pend:0x%04x force:0x%04x mask:0x%04x lvl1:0x%04x lvl0:0x%04x\n"
-disable grlib_irqmp_ack(int intno) "interrupt:%d"
-disable grlib_irqmp_set_irq(int irq) "Raise CPU IRQ %d"
-disable grlib_irqmp_readl_unknown(uint64_t addr) "addr 0x%"PRIx64""
-disable grlib_irqmp_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
+grlib_irqmp_check_irqs(uint32_t pend, uint32_t force, uint32_t mask, uint32_t lvl1, uint32_t lvl2) "pend:0x%04x force:0x%04x mask:0x%04x lvl1:0x%04x lvl0:0x%04x\n"
+grlib_irqmp_ack(int intno) "interrupt:%d"
+grlib_irqmp_set_irq(int irq) "Raise CPU IRQ %d"
+grlib_irqmp_readl_unknown(uint64_t addr) "addr 0x%"PRIx64""
+grlib_irqmp_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
 
 # hw/grlib_apbuart.c
-disable grlib_apbuart_event(int event) "event:%d"
-disable grlib_apbuart_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
+grlib_apbuart_event(int event) "event:%d"
+grlib_apbuart_writel_unknown(uint64_t addr, uint32_t value) "addr 0x%"PRIx64" value 0x%x"
 
 # hw/leon3.c
-disable leon3_set_irq(int intno) "Set CPU IRQ %d"
-disable leon3_reset_irq(int intno) "Reset CPU IRQ %d"
+leon3_set_irq(int intno) "Set CPU IRQ %d"
+leon3_reset_irq(int intno) "Reset CPU IRQ %d"
 
 # spice-qemu-char.c
-disable spice_vmc_write(ssize_t out, int len) "spice wrottn %zd of requested %d"
-disable spice_vmc_read(int bytes, int len) "spice read %d of requested %d"
-disable spice_vmc_register_interface(void *scd) "spice vmc registered interface %p"
-disable spice_vmc_unregister_interface(void *scd) "spice vmc unregistered interface %p"
+spice_vmc_write(ssize_t out, int len) "spice wrottn %zd of requested %d"
+spice_vmc_read(int bytes, int len) "spice read %d of requested %d"
+spice_vmc_register_interface(void *scd) "spice vmc registered interface %p"
+spice_vmc_unregister_interface(void *scd) "spice vmc unregistered interface %p"
 
 # hw/lm32_pic.c
-disable lm32_pic_raise_irq(void) "Raise CPU interrupt"
-disable lm32_pic_lower_irq(void) "Lower CPU interrupt"
-disable lm32_pic_interrupt(int irq, int level) "Set IRQ%d %d"
-disable lm32_pic_set_im(uint32_t im) "im 0x%08x"
-disable lm32_pic_set_ip(uint32_t ip) "ip 0x%08x"
-disable lm32_pic_get_im(uint32_t im) "im 0x%08x"
-disable lm32_pic_get_ip(uint32_t ip) "ip 0x%08x"
+lm32_pic_raise_irq(void) "Raise CPU interrupt"
+lm32_pic_lower_irq(void) "Lower CPU interrupt"
+lm32_pic_interrupt(int irq, int level) "Set IRQ%d %d"
+lm32_pic_set_im(uint32_t im) "im 0x%08x"
+lm32_pic_set_ip(uint32_t ip) "ip 0x%08x"
+lm32_pic_get_im(uint32_t im) "im 0x%08x"
+lm32_pic_get_ip(uint32_t ip) "ip 0x%08x"
 
 # hw/lm32_juart.c
-disable lm32_juart_get_jtx(uint32_t value) "jtx 0x%08x"
-disable lm32_juart_set_jtx(uint32_t value) "jtx 0x%08x"
-disable lm32_juart_get_jrx(uint32_t value) "jrx 0x%08x"
-disable lm32_juart_set_jrx(uint32_t value) "jrx 0x%08x"
+lm32_juart_get_jtx(uint32_t value) "jtx 0x%08x"
+lm32_juart_set_jtx(uint32_t value) "jtx 0x%08x"
+lm32_juart_get_jrx(uint32_t value) "jrx 0x%08x"
+lm32_juart_set_jrx(uint32_t value) "jrx 0x%08x"
 
 # hw/lm32_timer.c
-disable lm32_timer_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
-disable lm32_timer_memory_read(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
-disable lm32_timer_hit(void) "timer hit"
-disable lm32_timer_irq_state(int level) "irq state %d"
+lm32_timer_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
+lm32_timer_memory_read(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
+lm32_timer_hit(void) "timer hit"
+lm32_timer_irq_state(int level) "irq state %d"
 
 # hw/lm32_uart.c
-disable lm32_uart_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
-disable lm32_uart_memory_read(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
-disable lm32_uart_irq_state(int level) "irq state %d"
+lm32_uart_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
+lm32_uart_memory_read(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
+lm32_uart_irq_state(int level) "irq state %d"
 
 # hw/lm32_sys.c
-disable lm32_sys_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
+lm32_sys_memory_write(uint32_t addr, uint32_t value) "addr 0x%08x value 0x%08x"
 
 # hw/milkymist-ac97.c
-disable milkymist_ac97_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_ac97_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_ac97_pulse_irq_crrequest(void) "Pulse IRQ CR request"
-disable milkymist_ac97_pulse_irq_crreply(void) "Pulse IRQ CR reply"
-disable milkymist_ac97_pulse_irq_dmaw(void) "Pulse IRQ DMA write"
-disable milkymist_ac97_pulse_irq_dmar(void) "Pulse IRQ DMA read"
-disable milkymist_ac97_in_cb(int avail, uint32_t remaining) "avail %d remaining %u"
-disable milkymist_ac97_in_cb_transferred(int transferred) "transferred %d"
-disable milkymist_ac97_out_cb(int free, uint32_t remaining) "free %d remaining %u"
-disable milkymist_ac97_out_cb_transferred(int transferred) "transferred %d"
+milkymist_ac97_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_ac97_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_ac97_pulse_irq_crrequest(void) "Pulse IRQ CR request"
+milkymist_ac97_pulse_irq_crreply(void) "Pulse IRQ CR reply"
+milkymist_ac97_pulse_irq_dmaw(void) "Pulse IRQ DMA write"
+milkymist_ac97_pulse_irq_dmar(void) "Pulse IRQ DMA read"
+milkymist_ac97_in_cb(int avail, uint32_t remaining) "avail %d remaining %u"
+milkymist_ac97_in_cb_transferred(int transferred) "transferred %d"
+milkymist_ac97_out_cb(int free, uint32_t remaining) "free %d remaining %u"
+milkymist_ac97_out_cb_transferred(int transferred) "transferred %d"
 
 # hw/milkymist-hpdmc.c
-disable milkymist_hpdmc_memory_read(uint32_t addr, uint32_t value) "addr=%08x value=%08x"
-disable milkymist_hpdmc_memory_write(uint32_t addr, uint32_t value) "addr=%08x value=%08x"
+milkymist_hpdmc_memory_read(uint32_t addr, uint32_t value) "addr=%08x value=%08x"
+milkymist_hpdmc_memory_write(uint32_t addr, uint32_t value) "addr=%08x value=%08x"
 
 # hw/milkymist-memcard.c
-disable milkymist_memcard_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_memcard_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_memcard_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_memcard_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
 
 # hw/milkymist-minimac2.c
-disable milkymist_minimac2_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_minimac2_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_minimac2_mdio_write(uint8_t phy_addr, uint8_t addr, uint16_t value) "phy_addr %02x addr %02x value %04x"
-disable milkymist_minimac2_mdio_read(uint8_t phy_addr, uint8_t addr, uint16_t value) "phy_addr %02x addr %02x value %04x"
-disable milkymist_minimac2_tx_frame(uint32_t length) "length %u"
-disable milkymist_minimac2_rx_frame(const void *buf, uint32_t length) "buf %p length %u"
-disable milkymist_minimac2_drop_rx_frame(const void *buf) "buf %p"
-disable milkymist_minimac2_rx_transfer(const void *buf, uint32_t length) "buf %p length %d"
-disable milkymist_minimac2_raise_irq_rx(void) "Raise IRQ RX"
-disable milkymist_minimac2_lower_irq_rx(void) "Lower IRQ RX"
-disable milkymist_minimac2_pulse_irq_tx(void) "Pulse IRQ TX"
+milkymist_minimac2_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_minimac2_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_minimac2_mdio_write(uint8_t phy_addr, uint8_t addr, uint16_t value) "phy_addr %02x addr %02x value %04x"
+milkymist_minimac2_mdio_read(uint8_t phy_addr, uint8_t addr, uint16_t value) "phy_addr %02x addr %02x value %04x"
+milkymist_minimac2_tx_frame(uint32_t length) "length %u"
+milkymist_minimac2_rx_frame(const void *buf, uint32_t length) "buf %p length %u"
+milkymist_minimac2_drop_rx_frame(const void *buf) "buf %p"
+milkymist_minimac2_rx_transfer(const void *buf, uint32_t length) "buf %p length %d"
+milkymist_minimac2_raise_irq_rx(void) "Raise IRQ RX"
+milkymist_minimac2_lower_irq_rx(void) "Lower IRQ RX"
+milkymist_minimac2_pulse_irq_tx(void) "Pulse IRQ TX"
 
 # hw/milkymist-pfpu.c
-disable milkymist_pfpu_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_pfpu_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_pfpu_vectout(uint32_t a, uint32_t b, uint32_t dma_ptr) "a %08x b %08x dma_ptr %08x"
-disable milkymist_pfpu_pulse_irq(void) "Pulse IRQ"
+milkymist_pfpu_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_pfpu_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_pfpu_vectout(uint32_t a, uint32_t b, uint32_t dma_ptr) "a %08x b %08x dma_ptr %08x"
+milkymist_pfpu_pulse_irq(void) "Pulse IRQ"
 
 # hw/milkymist-softusb.c
-disable milkymist_softusb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_softusb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_softusb_mevt(uint8_t m) "m %d"
-disable milkymist_softusb_kevt(uint8_t m) "m %d"
-disable milkymist_softusb_mouse_event(int dx, int dy, int dz, int bs) "dx %d dy %d dz %d bs %02x"
-disable milkymist_softusb_pulse_irq(void) "Pulse IRQ"
+milkymist_softusb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_softusb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_softusb_mevt(uint8_t m) "m %d"
+milkymist_softusb_kevt(uint8_t m) "m %d"
+milkymist_softusb_mouse_event(int dx, int dy, int dz, int bs) "dx %d dy %d dz %d bs %02x"
+milkymist_softusb_pulse_irq(void) "Pulse IRQ"
 
 # hw/milkymist-sysctl.c
-disable milkymist_sysctl_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_sysctl_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_sysctl_icap_write(uint32_t value) "value %08x"
-disable milkymist_sysctl_start_timer0(void) "Start timer0"
-disable milkymist_sysctl_stop_timer0(void) "Stop timer0"
-disable milkymist_sysctl_start_timer1(void) "Start timer1"
-disable milkymist_sysctl_stop_timer1(void) "Stop timer1"
-disable milkymist_sysctl_pulse_irq_timer0(void) "Pulse IRQ Timer0"
-disable milkymist_sysctl_pulse_irq_timer1(void) "Pulse IRQ Timer1"
+milkymist_sysctl_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_sysctl_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_sysctl_icap_write(uint32_t value) "value %08x"
+milkymist_sysctl_start_timer0(void) "Start timer0"
+milkymist_sysctl_stop_timer0(void) "Stop timer0"
+milkymist_sysctl_start_timer1(void) "Start timer1"
+milkymist_sysctl_stop_timer1(void) "Stop timer1"
+milkymist_sysctl_pulse_irq_timer0(void) "Pulse IRQ Timer0"
+milkymist_sysctl_pulse_irq_timer1(void) "Pulse IRQ Timer1"
 
 # hw/milkymist-tmu2.c
-disable milkymist_tmu2_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_tmu2_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_tmu2_start(void) "Start TMU"
-disable milkymist_tmu2_pulse_irq(void) "Pulse IRQ"
+milkymist_tmu2_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_tmu2_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_tmu2_start(void) "Start TMU"
+milkymist_tmu2_pulse_irq(void) "Pulse IRQ"
 
 # hw/milkymist-uart.c
-disable milkymist_uart_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_uart_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_uart_pulse_irq_rx(void) "Pulse IRQ RX"
-disable milkymist_uart_pulse_irq_tx(void) "Pulse IRQ TX"
+milkymist_uart_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_uart_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_uart_pulse_irq_rx(void) "Pulse IRQ RX"
+milkymist_uart_pulse_irq_tx(void) "Pulse IRQ TX"
 
 # hw/milkymist-vgafb.c
-disable milkymist_vgafb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
-disable milkymist_vgafb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_vgafb_memory_read(uint32_t addr, uint32_t value) "addr %08x value %08x"
+milkymist_vgafb_memory_write(uint32_t addr, uint32_t value) "addr %08x value %08x"
 
 # xen-all.c
-disable xen_ram_alloc(unsigned long ram_addr, unsigned long size) "requested: %#lx, size %#lx"
-disable xen_client_set_memory(uint64_t start_addr, unsigned long size, unsigned long phys_offset, bool log_dirty) "%#"PRIx64" size %#lx, offset %#lx, log_dirty %i"
+xen_ram_alloc(unsigned long ram_addr, unsigned long size) "requested: %#lx, size %#lx"
+xen_client_set_memory(uint64_t start_addr, unsigned long size, unsigned long phys_offset, bool log_dirty) "%#"PRIx64" size %#lx, offset %#lx, log_dirty %i"
 
 # xen-mapcache.c
-disable xen_map_cache(uint64_t phys_addr) "want %#"PRIx64""
-disable xen_remap_bucket(uint64_t index) "index %#"PRIx64""
-disable xen_map_cache_return(void* ptr) "%p"
-disable xen_map_block(uint64_t phys_addr, uint64_t size) "%#"PRIx64", size %#"PRIx64""
-disable xen_unmap_block(void* addr, unsigned long size) "%p, size %#lx"
+xen_map_cache(uint64_t phys_addr) "want %#"PRIx64""
+xen_remap_bucket(uint64_t index) "index %#"PRIx64""
+xen_map_cache_return(void* ptr) "%p"
+xen_map_block(uint64_t phys_addr, uint64_t size) "%#"PRIx64", size %#"PRIx64""
+xen_unmap_block(void* addr, unsigned long size) "%p, size %#lx"
 
 # exec.c
-disable qemu_put_ram_ptr(void* addr) "%p"
+qemu_put_ram_ptr(void* addr) "%p"
 
 # hw/xen_platform.c
-disable xen_platform_log(char *s) "xen platform: %s"
+xen_platform_log(char *s) "xen platform: %s"
 
 # qemu-coroutine.c
-disable qemu_coroutine_enter(void *from, void *to, void *opaque) "from %p to %p opaque %p"
-disable qemu_coroutine_yield(void *from, void *to) "from %p to %p"
-disable qemu_coroutine_terminate(void *co) "self %p"
+qemu_coroutine_enter(void *from, void *to, void *opaque) "from %p to %p opaque %p"
+qemu_coroutine_yield(void *from, void *to) "from %p to %p"
+qemu_coroutine_terminate(void *co) "self %p"
 
 # qemu-coroutine-lock.c
-disable qemu_co_queue_next_bh(void) ""
-disable qemu_co_queue_next(void *next) "next %p"
-disable qemu_co_mutex_lock_entry(void *mutex, void *self) "mutex %p self %p"
-disable qemu_co_mutex_lock_return(void *mutex, void *self) "mutex %p self %p"
-disable qemu_co_mutex_unlock_entry(void *mutex, void *self) "mutex %p self %p"
-disable qemu_co_mutex_unlock_return(void *mutex, void *self) "mutex %p self %p"
+qemu_co_queue_next_bh(void) ""
+qemu_co_queue_next(void *next) "next %p"
+qemu_co_mutex_lock_entry(void *mutex, void *self) "mutex %p self %p"
+qemu_co_mutex_lock_return(void *mutex, void *self) "mutex %p self %p"
+qemu_co_mutex_unlock_entry(void *mutex, void *self) "mutex %p self %p"
+qemu_co_mutex_unlock_return(void *mutex, void *self) "mutex %p self %p"
 
 # hw/escc.c
-disable escc_put_queue(char channel, int b) "channel %c put: 0x%02x"
-disable escc_get_queue(char channel, int val) "channel %c get 0x%02x"
-disable escc_update_irq(int irq) "IRQ = %d"
-disable escc_update_parameters(char channel, int speed, int parity, int data_bits, int stop_bits) "channel %c: speed=%d parity=%c data=%d stop=%d"
-disable escc_mem_writeb_ctrl(char channel, uint32_t reg, uint32_t val) "Write channel %c, reg[%d] = %2.2x"
-disable escc_mem_writeb_data(char channel, uint32_t val) "Write channel %c, ch %d"
-disable escc_mem_readb_ctrl(char channel, uint32_t reg, uint8_t val) "Read channel %c, reg[%d] = %2.2x"
-disable escc_mem_readb_data(char channel, uint32_t ret) "Read channel %c, ch %d"
-disable escc_serial_receive_byte(char channel, int ch) "channel %c put ch %d"
-disable escc_sunkbd_event_in(int ch) "Untranslated keycode %2.2x"
-disable escc_sunkbd_event_out(int ch) "Translated keycode %2.2x"
-disable escc_kbd_command(int val) "Command %d"
-disable escc_sunmouse_event(int dx, int dy, int buttons_state) "dx=%d dy=%d buttons=%01x"
+escc_put_queue(char channel, int b) "channel %c put: 0x%02x"
+escc_get_queue(char channel, int val) "channel %c get 0x%02x"
+escc_update_irq(int irq) "IRQ = %d"
+escc_update_parameters(char channel, int speed, int parity, int data_bits, int stop_bits) "channel %c: speed=%d parity=%c data=%d stop=%d"
+escc_mem_writeb_ctrl(char channel, uint32_t reg, uint32_t val) "Write channel %c, reg[%d] = %2.2x"
+escc_mem_writeb_data(char channel, uint32_t val) "Write channel %c, ch %d"
+escc_mem_readb_ctrl(char channel, uint32_t reg, uint8_t val) "Read channel %c, reg[%d] = %2.2x"
+escc_mem_readb_data(char channel, uint32_t ret) "Read channel %c, ch %d"
+escc_serial_receive_byte(char channel, int ch) "channel %c put ch %d"
+escc_sunkbd_event_in(int ch) "Untranslated keycode %2.2x"
+escc_sunkbd_event_out(int ch) "Translated keycode %2.2x"
+escc_kbd_command(int val) "Command %d"
+escc_sunmouse_event(int dx, int dy, int buttons_state) "dx=%d dy=%d buttons=%01x"
diff --git a/trace/control.c b/trace/control.c
new file mode 100644
index 0000000000..4c5527d20a
--- /dev/null
+++ b/trace/control.c
@@ -0,0 +1,42 @@
+/*
+ * Interface for configuring and controlling the state of tracing events.
+ *
+ * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "trace/control.h"
+
+
+void trace_backend_init_events(const char *fname)
+{
+    if (fname == NULL) {
+        return;
+    }
+
+    FILE *fp = fopen(fname, "r");
+    if (!fp) {
+        fprintf(stderr, "error: could not open trace events file '%s': %s\n",
+                fname, strerror(errno));
+        exit(1);
+    }
+    char line_buf[1024];
+    while (fgets(line_buf, sizeof(line_buf), fp)) {
+        size_t len = strlen(line_buf);
+        if (len > 1) {              /* skip empty lines */
+            line_buf[len - 1] = '\0';
+            if (!trace_event_set_state(line_buf, true)) {
+                fprintf(stderr,
+                        "error: trace event '%s' does not exist\n", line_buf);
+                exit(1);
+            }
+        }
+    }
+    if (fclose(fp) != 0) {
+        fprintf(stderr, "error: closing file '%s': %s\n",
+                fname, strerror(errno));
+        exit(1);
+    }
+}
diff --git a/trace/control.h b/trace/control.h
new file mode 100644
index 0000000000..2acaa4290e
--- /dev/null
+++ b/trace/control.h
@@ -0,0 +1,41 @@
+/*
+ * Interface for configuring and controlling the state of tracing events.
+ *
+ * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#ifndef TRACE_CONTROL_H
+#define TRACE_CONTROL_H
+
+#include "qemu-common.h"
+
+
+/** Print the state of all events. */
+void trace_print_events(FILE *stream, fprintf_function stream_printf);
+/** Set the state of an event.
+ *
+ * @return Whether the state changed.
+ */
+bool trace_event_set_state(const char *name, bool state);
+
+
+/** Initialize the tracing backend.
+ *
+ * @events Name of file with events to be enabled at startup; may be NULL.
+ *         Corresponds to commandline option "-trace events=...".
+ * @file   Name of trace output file; may be NULL.
+ *         Corresponds to commandline option "-trace file=...".
+ * @return Whether the backend could be successfully initialized.
+ */
+bool trace_backend_init(const char *events, const char *file);
+
+/** Generic function to initialize the state of events.
+ *
+ * @fname Name of file with events to enable; may be NULL.
+ */
+void trace_backend_init_events(const char *fname);
+
+#endif  /* TRACE_CONTROL_H */
diff --git a/trace/default.c b/trace/default.c
new file mode 100644
index 0000000000..c9b27a289b
--- /dev/null
+++ b/trace/default.c
@@ -0,0 +1,41 @@
+/*
+ * Default implementation for backend initialization from commandline.
+ *
+ * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ */
+
+#include "trace/control.h"
+
+
+void trace_print_events(FILE *stream, fprintf_function stream_printf)
+{
+    fprintf(stderr, "warning: "
+            "cannot print the trace events with the current backend\n");
+    stream_printf(stream, "error: "
+                  "operation not supported with the current backend\n");
+}
+
+bool trace_event_set_state(const char *name, bool state)
+{
+    fprintf(stderr, "warning: "
+            "cannot set the state of a trace event with the current backend\n");
+    return false;
+}
+
+bool trace_backend_init(const char *events, const char *file)
+{
+    if (events) {
+        fprintf(stderr, "error: -trace events=...: "
+                "option not supported by the selected tracing backend\n");
+        return false;
+    }
+    if (file) {
+        fprintf(stderr, "error: -trace file=...: "
+                "option not supported by the selected tracing backend\n");
+        return false;
+    }
+    return true;
+}
diff --git a/simpletrace.c b/trace/simple.c
index de355e9675..a6093682dd 100644
--- a/simpletrace.c
+++ b/trace/simple.c
@@ -16,6 +16,7 @@
 #include <pthread.h>
 #include "qemu-timer.h"
 #include "trace.h"
+#include "trace/control.h"
 
 /** Trace file header event ID */
 #define HEADER_EVENT_ID (~(uint64_t)0) /* avoids conflicting with TraceEventIDs */
@@ -302,7 +303,12 @@ void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char
     }
 }
 
-void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
+void st_flush_trace_buffer(void)
+{
+    flush_trace_file(true);
+}
+
+void trace_print_events(FILE *stream, fprintf_function stream_printf)
 {
     unsigned int i;
 
@@ -312,25 +318,20 @@ void st_print_trace_events(FILE *stream, int (*stream_printf)(FILE *stream, cons
     }
 }
 
-bool st_change_trace_event_state(const char *name, bool enabled)
+bool trace_event_set_state(const char *name, bool state)
 {
     unsigned int i;
 
     for (i = 0; i < NR_TRACE_EVENTS; i++) {
         if (!strcmp(trace_list[i].tp_name, name)) {
-            trace_list[i].state = enabled;
+            trace_list[i].state = state;
             return true;
         }
     }
     return false;
 }
 
-void st_flush_trace_buffer(void)
-{
-    flush_trace_file(true);
-}
-
-bool st_init(const char *file)
+bool trace_backend_init(const char *events, const char *file)
 {
     pthread_t thread;
     pthread_attr_t attr;
@@ -346,10 +347,12 @@ bool st_init(const char *file)
     pthread_sigmask(SIG_SETMASK, &oldset, NULL);
 
     if (ret != 0) {
-        return false;
+        fprintf(stderr, "warning: unable to initialize simple trace backend\n");
+    } else {
+        atexit(st_flush_trace_buffer);
+        trace_backend_init_events(events);
+        st_set_trace_file(file);
     }
 
-    atexit(st_flush_trace_buffer);
-    st_set_trace_file(file);
     return true;
 }
diff --git a/simpletrace.h b/trace/simple.h
index 8d893bd849..466e75b4ff 100644
--- a/simpletrace.h
+++ b/trace/simple.h
@@ -8,14 +8,13 @@
  *
  */
 
-#ifndef SIMPLETRACE_H
-#define SIMPLETRACE_H
+#ifndef TRACE_SIMPLE_H
+#define TRACE_SIMPLE_H
 
 #include <stdint.h>
 #include <stdbool.h>
 #include <stdio.h>
 
-#ifdef CONFIG_SIMPLE_TRACE
 typedef uint64_t TraceEventID;
 
 typedef struct {
@@ -31,18 +30,9 @@ void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t
 void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5);
 void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6);
 void st_print_trace(FILE *stream, fprintf_function stream_printf);
-void st_print_trace_events(FILE *stream, fprintf_function stream_printf);
-bool st_change_trace_event_state(const char *tname, bool tstate);
 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
 void st_set_trace_file_enabled(bool enable);
 bool st_set_trace_file(const char *file);
 void st_flush_trace_buffer(void);
-bool st_init(const char *file);
-#else
-static inline bool st_init(const char *file)
-{
-    return true;
-}
-#endif /* !CONFIG_SIMPLE_TRACE */
 
-#endif /* SIMPLETRACE_H */
+#endif /* TRACE_SIMPLE_H */
diff --git a/trace/stderr.c b/trace/stderr.c
new file mode 100644
index 0000000000..7107c4a131
--- /dev/null
+++ b/trace/stderr.c
@@ -0,0 +1,37 @@
+#include "trace.h"
+#include "trace/control.h"
+
+
+void trace_print_events(FILE *stream, fprintf_function stream_printf)
+{
+    unsigned int i;
+
+    for (i = 0; i < NR_TRACE_EVENTS; i++) {
+        stream_printf(stream, "%s [Event ID %u] : state %u\n",
+                      trace_list[i].tp_name, i, trace_list[i].state);
+    }
+}
+
+bool trace_event_set_state(const char *name, bool state)
+{
+    unsigned int i;
+
+    for (i = 0; i < NR_TRACE_EVENTS; i++) {
+        if (!strcmp(trace_list[i].tp_name, name)) {
+            trace_list[i].state = state;
+            return true;
+        }
+    }
+    return false;
+}
+
+bool trace_backend_init(const char *events, const char *file)
+{
+    if (file) {
+        fprintf(stderr, "error: -trace file=...: "
+                "option not supported by the selected tracing backend\n");
+        return false;
+    }
+    trace_backend_init_events(events);
+    return true;
+}
diff --git a/trace/stderr.h b/trace/stderr.h
new file mode 100644
index 0000000000..d575b613e3
--- /dev/null
+++ b/trace/stderr.h
@@ -0,0 +1,11 @@
+#ifndef TRACE_STDERR_H
+#define TRACE_STDERR_H
+
+typedef uint64_t TraceEventID;
+
+typedef struct {
+    const char *tp_name;
+    bool state;
+} TraceEvent;
+
+#endif /* ! TRACE_STDERR_H */
diff --git a/vl.c b/vl.c
index a6f4c710d6..60bce0cc71 100644
--- a/vl.c
+++ b/vl.c
@@ -158,7 +158,7 @@ int main(int argc, char **argv)
 #include "slirp/libslirp.h"
 
 #include "trace.h"
-#include "simpletrace.h"
+#include "trace/control.h"
 #include "qemu-queue.h"
 #include "cpus.h"
 #include "arch_init.h"
@@ -2204,7 +2204,6 @@ int main(int argc, char **argv, char **envp)
     int show_vnc_port = 0;
 #endif
     int defconfig = 1;
-    const char *trace_file = NULL;
     const char *log_mask = NULL;
     const char *log_file = NULL;
     GMemVTable mem_trace = {
@@ -2212,6 +2211,8 @@ int main(int argc, char **argv, char **envp)
         .realloc = realloc_and_trace,
         .free = free_and_trace,
     };
+    const char *trace_events = NULL;
+    const char *trace_file = NULL;
 
     atexit(qemu_run_exit_notifiers);
     error_set_progname(argv[0]);
@@ -3002,14 +3003,16 @@ int main(int argc, char **argv, char **envp)
                 }
                 xen_mode = XEN_ATTACH;
                 break;
-#ifdef CONFIG_SIMPLE_TRACE
             case QEMU_OPTION_trace:
+            {
                 opts = qemu_opts_parse(qemu_find_opts("trace"), optarg, 0);
-                if (opts) {
-                    trace_file = qemu_opt_get(opts, "file");
+                if (!opts) {
+                    exit(1);
                 }
+                trace_events = qemu_opt_get(opts, "events");
+                trace_file = qemu_opt_get(opts, "file");
                 break;
-#endif
+            }
             case QEMU_OPTION_readconfig:
                 {
                     int ret = qemu_read_config_file(optarg);
@@ -3067,8 +3070,8 @@ int main(int argc, char **argv, char **envp)
         set_cpu_log(log_mask);
     }
 
-    if (!st_init(trace_file)) {
-        fprintf(stderr, "warning: unable to initialize simple trace backend\n");
+    if (!trace_backend_init(trace_events, trace_file)) {
+        exit(1);
     }
 
     /* If no data_dir is specified then try to find it relative to the