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[Qemu-devel] [PATCH v5 07/22] instrument: [qapi] Add library loader


From: Lluís Vilanova
Subject: [Qemu-devel] [PATCH v5 07/22] instrument: [qapi] Add library loader
Date: Wed, 13 Sep 2017 00:29:58 +0300
User-agent: StGit/0.18

Signed-off-by: Lluís Vilanova <address@hidden>
---
 MAINTAINERS              |    1 +
 Makefile                 |    1 +
 instrument/Makefile.objs |    1 +
 instrument/qmp.c         |   82 ++++++++++++++++++++++++++++++++++++++++++++++
 monitor.c                |    4 ++
 qapi-schema.json         |    3 ++
 qapi/instrument.json     |   49 +++++++++++++++++++++++++++
 stubs/instrument.c       |   26 +++++++++++++++
 8 files changed, 167 insertions(+)
 create mode 100644 instrument/qmp.c
 create mode 100644 qapi/instrument.json

diff --git a/MAINTAINERS b/MAINTAINERS
index 6c0b12a69a..edddab0502 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1492,6 +1492,7 @@ M: Stefan Hajnoczi <address@hidden>
 S: Maintained
 F: docs/instrument.txt
 F: instrument/
+F: qapi/instrument.json
 
 TPM
 S: Orphan
diff --git a/Makefile b/Makefile
index 337a1f6f9b..3861b3f49c 100644
--- a/Makefile
+++ b/Makefile
@@ -412,6 +412,7 @@ qapi-modules = $(SRC_PATH)/qapi-schema.json 
$(SRC_PATH)/qapi/common.json \
                $(SRC_PATH)/qapi/block.json $(SRC_PATH)/qapi/block-core.json \
                $(SRC_PATH)/qapi/char.json \
                $(SRC_PATH)/qapi/crypto.json \
+               $(SRC_PATH)/qapi/instrument.json \
                $(SRC_PATH)/qapi/introspect.json \
                $(SRC_PATH)/qapi/migration.json \
                $(SRC_PATH)/qapi/net.json \
diff --git a/instrument/Makefile.objs b/instrument/Makefile.objs
index 71994a4c85..7bf4e27e3c 100644
--- a/instrument/Makefile.objs
+++ b/instrument/Makefile.objs
@@ -2,3 +2,4 @@
 
 target-obj-$(CONFIG_INSTRUMENT) += cmdline.o
 target-obj-$(CONFIG_INSTRUMENT) += load.o
+target-obj-$(CONFIG_INSTRUMENT) += qmp.o
diff --git a/instrument/qmp.c b/instrument/qmp.c
new file mode 100644
index 0000000000..e4464aa5eb
--- /dev/null
+++ b/instrument/qmp.c
@@ -0,0 +1,82 @@
+/*
+ * QMP interface for instrumentation control commands.
+ *
+ * Copyright (C) 2012-2017 Lluís Vilanova <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include <dlfcn.h>
+
+#include "instrument/load.h"
+#include "qemu-common.h"
+#include "qapi/qmp/qerror.h"
+#include "qmp-commands.h"
+
+
+InstrLoadResult *qmp_instr_load(const char *path,
+                                bool has_id, const char *id,
+                                bool have_args, strList *args,
+                                Error **errp)
+{
+    InstrLoadResult *res = g_malloc0(sizeof(*res));
+    int argc = 0;
+    const char **argv = NULL;
+    InstrLoadError code;
+
+    if (!has_id) {
+        id = NULL;
+    }
+
+    strList *entry = have_args ? args : NULL;
+    while (entry != NULL) {
+        argv = realloc(argv, sizeof(*argv) * (argc + 1));
+        argv[argc] = entry->value;
+        argc++;
+        entry = entry->next;
+    }
+
+    code = instr_load(path, argc, argv, &id);
+    switch (code) {
+    case INSTR_LOAD_OK:
+        res->id = g_strdup(id);
+        break;
+    case INSTR_LOAD_ID_EXISTS:
+        error_setg(errp, "Library ID exists");
+        break;
+    case INSTR_LOAD_TOO_MANY:
+        error_setg(errp, "Tried to load too many libraries");
+        break;
+    case INSTR_LOAD_ERROR:
+        error_setg(errp, "Library initialization returned non-zero");
+        break;
+    case INSTR_LOAD_DLERROR:
+        error_setg(errp, "Error loading library: %s",
+                   dlerror());
+        break;
+    }
+
+    if (*errp) {
+        g_free(res);
+        res = NULL;
+    }
+
+    return res;
+}
+
+void qmp_instr_unload(const char *id, Error **errp)
+{
+    InstrUnloadError code = instr_unload(id);
+    switch (code) {
+    case INSTR_UNLOAD_OK:
+        break;
+    case INSTR_UNLOAD_INVALID:
+        error_setg(errp, "Unknown library ID");
+        break;
+    case INSTR_UNLOAD_DLERROR:
+        error_setg(errp, "Error unloading library: %s", dlerror());
+        break;
+    }
+}
diff --git a/monitor.c b/monitor.c
index 9239f7adde..e031aa2687 100644
--- a/monitor.c
+++ b/monitor.c
@@ -978,6 +978,10 @@ static void qmp_unregister_commands_hack(void)
     qmp_unregister_command(&qmp_commands, "query-xen-replication-status");
     qmp_unregister_command(&qmp_commands, "xen-colo-do-checkpoint");
 #endif
+#ifndef CONFIG_INSTRUMENT
+    qmp_unregister_command(&qmp_commands, "instr-load");
+    qmp_unregister_command(&qmp_commands, "instr-unload");
+#endif
 #ifndef TARGET_I386
     qmp_unregister_command(&qmp_commands, "rtc-reset-reinjection");
 #endif
diff --git a/qapi-schema.json b/qapi-schema.json
index f3af2cb851..706c64659f 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -93,6 +93,9 @@
 { 'include': 'qapi/trace.json' }
 { 'include': 'qapi/introspect.json' }
 
+# Instrumentation commands
+{ 'include': 'qapi/instrument.json' }
+
 ##
 # = Miscellanea
 ##
diff --git a/qapi/instrument.json b/qapi/instrument.json
new file mode 100644
index 0000000000..c59bee74cb
--- /dev/null
+++ b/qapi/instrument.json
@@ -0,0 +1,49 @@
+# *-*- Mode: Python -*-*
+#
+# Copyright (C) 2012-2017 Lluís Vilanova <address@hidden>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+##
+# QAPI instrumentation control commands.
+##
+
+##
+# @InstrLoadResult:
+#
+# Result of an 'instr-load' command.
+#
+# @id: instrumentation library ID
+#
+# Since: 2.11
+##
+{ 'struct': 'InstrLoadResult',
+  'data': { 'id': 'str' } }
+
+##
+# @instr-load:
+#
+# Load an instrumentation library.
+#
+# @path: path to the dynamic instrumentation library
+# @id: unique ID for the loaded library
+# @args: arguments to the dynamic instrumentation library
+#
+# Since: 2.11
+##
+{ 'command': 'instr-load',
+  'data':    { 'path': 'str', '*id': 'str', '*args': ['str'] },
+  'returns': 'InstrLoadResult' }
+
+##
+# @instr-unload:
+#
+# Unload an instrumentation library.
+#
+# @id: unique ID passed to instr-load().
+#
+# Since: 2.11
+##
+{ 'command': 'instr-unload',
+  'data': { 'id': 'str' } }
diff --git a/stubs/instrument.c b/stubs/instrument.c
index 7d66f75454..79cd0fd2d1 100644
--- a/stubs/instrument.c
+++ b/stubs/instrument.c
@@ -7,7 +7,15 @@
  * See the COPYING file in the top-level directory.
  */
 
+#include "qemu/osdep.h"
+
 #include "instrument/cmdline.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
+
+
+/* Declare missing types */
+typedef struct strList strList;
 
 
 void instr_init(const char *path, int argc, const char **argv)
@@ -16,3 +24,21 @@ void instr_init(const char *path, int argc, const char 
**argv)
 void instr_fini(void)
 {
 }
+
+InstrLoadResult *qmp_instr_load(const char *path,
+                                bool has_id, const char *id,
+                                bool have_args, strList *args,
+                                Error **errp);
+InstrLoadResult *qmp_instr_load(const char *path,
+                                bool has_id, const char *id,
+                                bool have_args, strList *args,
+                                Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+void qmp_instr_unload(const char *id, Error **errp);
+void qmp_instr_unload(const char *id, Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+}




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