modules: build spice and opengl as module.

-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.22 (GNU/Linux)
 
 iQIcBAABCgAGBQJfkRSjAAoJEEy22O7T6HE4w4UP/RHNNgRzPWB7kJaiCDGrqGVK
 FSMqUKTkzieIEvW7baVaY19KY2z5HB9Mtna6Ogl6BXdMbmwwaxdMtzHc9RySlLyP
 iUA9iFqDjYbbFtanFEQjv/181Dr/Ib3AgW4muQi/BysvAu9GmFQuRlK07w3KR+QR
 0HXYmrKqpnQxrM0s3h9XwT2VKRYEk8X3fcsQypTyiuqqFXFveIwoFl0XtcU8kq8K
 D+BI/nRZRr+wQG2fW0JjRPRxiUPSAUJgMRqJhPdZ+55enfaxCUTThpw9UVRa8vsr
 g7SY6vadGbqyxq45kyc56p7oc5gxeUbTXklrJqz4blBhl/AnAZyjVMOhBqz3+Sgl
 DORyjrz+M4Wyb/nzlh0HsuZYJmHH3tNgFEruPbyPT4LTpFZ8yUuThNUTl8r6r5aE
 mJkRW9U1xeSrsdiw7vJv+gfxC4J37EMry0OdcL6fcixZSEXaDT/9E+MMhz9UOAC1
 cGTg7fBN4sc/6oifqURz3vMJF1NcSocqPg0rvbkOCAzlf5TzRD07A6lgzLclemyi
 XpKp0qbfE9esLAj5/FPZHkOSGKApo3WzdtExrc8aGIRqE3y1FNUG0hY9RTHEi2po
 vWUEmneTo08Ly+t/COBikOUCGwZAZDIr9v7dxZBBmcmvqRrhbzHAr+JM1y0Unfy1
 /3dNMlA2qsjbezkDzO1U
 =5tJo
 -----END PGP SIGNATURE-----

Merge remote-tracking branch 'remotes/kraxel/tags/modules-20201022-pull-request' into staging

modules: build spice and opengl as module.

# gpg: Signature made Thu 22 Oct 2020 06:12:03 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/modules-20201022-pull-request:
  opengl: build opengl helper code modular
  opengl: build egl-headless display modular
  spice: flip modules switch
  modules: add spice dependencies
  modules: dependencies infrastructure
  spice: load module when enabled on the cmdline
  spice: wire up monitor in QemuSpiceOps.
  spice: move display_add_client() to QemuSpiceOps.
  spice: move auth functions to QemuSpiceOps.
  spice: move add_interface() to QemuSpiceOps.
  spice: move display_init() to QemuSpiceOps.
  spice: move qemu_spice_init() to QemuSpiceOps.
  spice: add QemuSpiceOps, move migrate_info
  spice: add module helpers

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

audio/spiceaudio.c

@@ -106,7 +106,7 @@ static int line_out_init(HWVoiceOut *hw, struct audsettings *as,
     out->active = 0;
 
     out->sin.base.sif = &playback_sif.base;
-    qemu_spice_add_interface (&out->sin.base);
+    qemu_spice.add_interface(&out->sin.base);
 #if SPICE_INTERFACE_PLAYBACK_MAJOR > 1 || SPICE_INTERFACE_PLAYBACK_MINOR >= 3
     spice_server_set_playback_rate(&out->sin, settings.freq);
 #endif
@@ -215,7 +215,7 @@ static int line_in_init(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
     in->active = 0;
 
     in->sin.base.sif = &record_sif.base;
-    qemu_spice_add_interface (&in->sin.base);
+    qemu_spice.add_interface(&in->sin.base);
 #if SPICE_INTERFACE_RECORD_MAJOR > 2 || SPICE_INTERFACE_RECORD_MINOR >= 3
     spice_server_set_record_rate(&in->sin, settings.freq);
 #endif

chardev/spice.c

@@ -110,7 +110,7 @@ static void vmc_register_interface(SpiceChardev *scd)
         return;
     }
     scd->sin.base.sif = &vmc_interface.base;
-    qemu_spice_add_interface(&scd->sin.base);
+    qemu_spice.add_interface(&scd->sin.base);
     scd->active = true;
     trace_spice_vmc_register_interface(scd);
 }

include/ui/qemu-spice-module.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2010 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef QEMU_SPICE_MODULE_H
+#define QEMU_SPICE_MODULE_H
+
+#ifdef CONFIG_SPICE
+#include <spice.h>
+#endif
+
+typedef struct SpiceInfo SpiceInfo;
+
+struct QemuSpiceOps {
+    void (*init)(void);
+    void (*display_init)(void);
+    int (*migrate_info)(const char *h, int p, int t, const char *s);
+    int (*set_passwd)(const char *passwd,
+                      bool fail_if_connected, bool disconnect_if_connected);
+    int (*set_pw_expire)(time_t expires);
+    int (*display_add_client)(int csock, int skipauth, int tls);
+#ifdef CONFIG_SPICE
+    int (*add_interface)(SpiceBaseInstance *sin);
+    SpiceInfo* (*qmp_query)(Error **errp);
+#endif
+};
+
+extern int using_spice;
+extern struct QemuSpiceOps qemu_spice;
+
+#endif

include/ui/qemu-spice.h

@@ -19,24 +19,17 @@
 #define QEMU_SPICE_H
 
 #include "qapi/error.h"
+#include "ui/qemu-spice-module.h"
 
 #ifdef CONFIG_SPICE
 
 #include <spice.h>
 #include "qemu/config-file.h"
 
-extern int using_spice;
-
-void qemu_spice_init(void);
 void qemu_spice_input_init(void);
 void qemu_spice_display_init(void);
-int qemu_spice_display_add_client(int csock, int skipauth, int tls);
-int qemu_spice_add_interface(SpiceBaseInstance *sin);
 bool qemu_spice_have_display_interface(QemuConsole *con);
 int qemu_spice_add_display_interface(QXLInstance *qxlin, QemuConsole *con);
-int qemu_spice_set_passwd(const char *passwd,
-                          bool fail_if_connected, bool disconnect_if_connected);
-int qemu_spice_set_pw_expire(time_t expires);
 int qemu_spice_migrate_info(const char *hostname, int port, int tls_port,
                             const char *subject);
 
@@ -50,40 +43,7 @@ int qemu_spice_migrate_info(const char *hostname, int port, int tls_port,
 
 #include "qemu/error-report.h"
 
-#define using_spice 0
 #define spice_displays 0
-static inline int qemu_spice_set_passwd(const char *passwd,
-                                        bool fail_if_connected,
-                                        bool disconnect_if_connected)
-{
-    return -1;
-}
-static inline int qemu_spice_set_pw_expire(time_t expires)
-{
-    return -1;
-}
-static inline int qemu_spice_migrate_info(const char *h, int p, int t,
-                                          const char *s)
-{
-    return -1;
-}
-
-static inline int qemu_spice_display_add_client(int csock, int skipauth,
-                                                int tls)
-{
-    return -1;
-}
-
-static inline void qemu_spice_display_init(void)
-{
-    /* This must never be called if CONFIG_SPICE is disabled */
-    error_report("spice support is disabled");
-    abort();
-}
-
-static inline void qemu_spice_init(void)
-{
-}
 
 #endif /* CONFIG_SPICE */
 

monitor/misc.c

@@ -437,7 +437,7 @@ void qmp_client_migrate_info(const char *protocol, const char *hostname,
             return;
         }
 
-        if (qemu_spice_migrate_info(hostname,
+        if (qemu_spice.migrate_info(hostname,
                                     has_port ? port : -1,
                                     has_tls_port ? tls_port : -1,
                                     cert_subject)) {

monitor/qmp-cmds.c

@@ -197,7 +197,7 @@ void qmp_set_password(const char *protocol, const char *password,
         if (!qemu_using_spice(errp)) {
             return;
         }
-        rc = qemu_spice_set_passwd(password, fail_if_connected,
+        rc = qemu_spice.set_passwd(password, fail_if_connected,
                                    disconnect_if_connected);
         if (rc != 0) {
             error_setg(errp, QERR_SET_PASSWD_FAILED);
@@ -243,7 +243,7 @@ void qmp_expire_password(const char *protocol, const char *whenstr,
         if (!qemu_using_spice(errp)) {
             return;
         }
-        rc = qemu_spice_set_pw_expire(when);
+        rc = qemu_spice.set_pw_expire(when);
         if (rc != 0) {
             error_setg(errp, QERR_SET_PASSWD_FAILED);
         }
@@ -340,7 +340,7 @@ void qmp_add_client(const char *protocol, const char *fdname,
         }
         skipauth = has_skipauth ? skipauth : false;
         tls = has_tls ? tls : false;
-        if (qemu_spice_display_add_client(fd, skipauth, tls) < 0) {
+        if (qemu_spice.display_add_client(fd, skipauth, tls) < 0) {
             error_setg(errp, "spice failed to add client");
             close(fd);
         }

softmmu/vl.c

@@ -3705,7 +3705,11 @@ void qemu_init(int argc, char **argv, char **envp)
                     break;
                 }
             case QEMU_OPTION_spice:
-                olist = qemu_find_opts("spice");
+                olist = qemu_find_opts_err("spice", NULL);
+                if (!olist) {
+                    ui_module_load_one("spice-core");
+                    olist = qemu_find_opts("spice");
+                }
                 if (!olist) {
                     error_report("spice support is disabled");
                     exit(1);
@@ -4151,7 +4155,7 @@ void qemu_init(int argc, char **argv, char **envp)
     /* spice needs the timers to be initialized by this point */
     /* spice must initialize before audio as it changes the default auiodev */
     /* spice must initialize before chardevs (for spicevmc and spiceport) */
-    qemu_spice_init();
+    qemu_spice.init();
 
     qemu_opts_foreach(qemu_find_opts("chardev"),
                       chardev_init_func, NULL, &error_fatal);
@@ -4447,7 +4451,7 @@ void qemu_init(int argc, char **argv, char **envp)
 #endif
 
     if (using_spice) {
-        qemu_spice_display_init();
+        qemu_spice.display_init();
     }
 
     if (foreach_device_config(DEV_GDB, gdbserver_start) < 0) {

ui/meson.build

@@ -12,9 +12,9 @@ softmmu_ss.add(files(
   'keymaps.c',
   'qemu-pixman.c',
 ))
+softmmu_ss.add([spice_headers, files('spice-module.c')])
 
 softmmu_ss.add(when: 'CONFIG_LINUX', if_true: files('input-linux.c'))
-softmmu_ss.add(when: [spice, 'CONFIG_SPICE'], if_true: files('spice-core.c', 'spice-input.c', 'spice-display.c'))
 softmmu_ss.add(when: cocoa, if_true: files('cocoa.m'))
 
 vnc_ss = ss.source_set()
@@ -33,8 +33,6 @@ vnc_ss.add(zlib, png, jpeg)
 vnc_ss.add(when: sasl, if_true: files('vnc-auth-sasl.c'))
 softmmu_ss.add_all(when: vnc, if_true: vnc_ss)
 softmmu_ss.add(when: vnc, if_false: files('vnc-stubs.c'))
-softmmu_ss.add(when: [opengl, 'CONFIG_OPENGL'], if_true: files('shader.c', 'console-gl.c', 'egl-helpers.c', 'egl-context.c'))
-softmmu_ss.add(when: [opengl, 'CONFIG_OPENGL_DMABUF'], if_true: files('egl-headless.c'))
 specific_ss.add(when: ['CONFIG_SOFTMMU'], if_true: opengl)
 
 ui_modules = {}
@@ -45,6 +43,20 @@ if curses.found()
   ui_modules += {'curses' : curses_ss}
 endif
 
+if config_host.has_key('CONFIG_OPENGL')
+  opengl_ss = ss.source_set()
+  opengl_ss.add(when: [opengl, pixman, 'CONFIG_OPENGL'],
+               if_true: files('shader.c', 'console-gl.c', 'egl-helpers.c', 'egl-context.c'))
+  ui_modules += {'opengl' : opengl_ss}
+endif
+
+if config_host.has_key('CONFIG_OPENGL_DMABUF')
+  egl_headless_ss = ss.source_set()
+  egl_headless_ss.add(when: [opengl, pixman, 'CONFIG_OPENGL_DMABUF'],
+                      if_true: files('egl-headless.c'))
+  ui_modules += {'egl-headless' : egl_headless_ss}
+endif
+
 if config_host.has_key('CONFIG_GTK')
   softmmu_ss.add(when: 'CONFIG_WIN32', if_true: files('win32-kbd-hook.c'))
 
@@ -70,6 +82,16 @@ if sdl.found()
   ui_modules += {'sdl' : sdl_ss}
 endif
 
+if config_host.has_key('CONFIG_SPICE')
+  spice_core_ss = ss.source_set()
+  spice_core_ss.add(spice, pixman, files(
+    'spice-core.c',
+    'spice-input.c',
+    'spice-display.c'
+  ))
+  ui_modules += {'spice-core' : spice_core_ss}
+endif
+
 if config_host.has_key('CONFIG_SPICE') and config_host.has_key('CONFIG_GIO')
   spice_ss = ss.source_set()
   spice_ss.add(spice, gio, pixman, files('spice-app.c'))

ui/spice-core.c

@@ -48,7 +48,6 @@ static time_t auth_expires = TIME_MAX;
 static int spice_migration_completed;
 static int spice_display_is_running;
 static int spice_have_target_host;
-int using_spice = 0;
 
 static QemuThread me;
 
@@ -503,7 +502,7 @@ static QemuOptsList qemu_spice_opts = {
     },
 };
 
-SpiceInfo *qmp_query_spice(Error **errp)
+static SpiceInfo *qmp_query_spice_real(Error **errp)
 {
     QemuOpts *opts = QTAILQ_FIRST(&qemu_spice_opts.head);
     int port, tls_port;
@@ -634,7 +633,7 @@ static void vm_change_state_handler(void *opaque, int running,
     }
 }
 
-void qemu_spice_init(void)
+static void qemu_spice_init(void)
 {
     QemuOpts *opts = QTAILQ_FIRST(&qemu_spice_opts.head);
     const char *password, *str, *x509_dir, *addr,
@@ -728,7 +727,7 @@ void qemu_spice_init(void)
                              tls_ciphers);
     }
     if (password) {
-        qemu_spice_set_passwd(password, false, false);
+        qemu_spice.set_passwd(password, false, false);
     }
     if (qemu_opt_get_bool(opts, "sasl", 0)) {
         if (spice_server_set_sasl(spice_server, 1) == -1) {
@@ -801,7 +800,7 @@ void qemu_spice_init(void)
     migration_state.notify = migration_state_notifier;
     add_migration_state_change_notifier(&migration_state);
     spice_migrate.base.sif = &migrate_interface.base;
-    qemu_spice_add_interface(&spice_migrate.base);
+    qemu_spice.add_interface(&spice_migrate.base);
 
     qemu_spice_input_init();
 
@@ -830,7 +829,7 @@ void qemu_spice_init(void)
 #endif
 }
 
-int qemu_spice_add_interface(SpiceBaseInstance *sin)
+static int qemu_spice_add_interface(SpiceBaseInstance *sin)
 {
     if (!spice_server) {
         if (QTAILQ_FIRST(&qemu_spice_opts.head) != NULL) {
@@ -942,8 +941,8 @@ static int qemu_spice_set_ticket(bool fail_if_conn, bool disconnect_if_conn)
                                    fail_if_conn, disconnect_if_conn);
 }
 
-int qemu_spice_set_passwd(const char *passwd,
+static int qemu_spice_set_passwd(const char *passwd,
-                          bool fail_if_conn, bool disconnect_if_conn)
+                                 bool fail_if_conn, bool disconnect_if_conn)
 {
     if (strcmp(auth, "spice") != 0) {
         return -1;
@@ -954,13 +953,13 @@ int qemu_spice_set_passwd(const char *passwd,
     return qemu_spice_set_ticket(fail_if_conn, disconnect_if_conn);
 }
 
-int qemu_spice_set_pw_expire(time_t expires)
+static int qemu_spice_set_pw_expire(time_t expires)
 {
     auth_expires = expires;
     return qemu_spice_set_ticket(false, false);
 }
 
-int qemu_spice_display_add_client(int csock, int skipauth, int tls)
+static int qemu_spice_display_add_client(int csock, int skipauth, int tls)
 {
     if (tls) {
         return spice_server_add_ssl_client(spice_server, csock, skipauth);
@@ -994,8 +993,20 @@ int qemu_spice_display_is_running(SimpleSpiceDisplay *ssd)
     return spice_display_is_running;
 }
 
+static struct QemuSpiceOps real_spice_ops = {
+    .init         = qemu_spice_init,
+    .display_init = qemu_spice_display_init,
+    .migrate_info = qemu_spice_migrate_info,
+    .set_passwd   = qemu_spice_set_passwd,
+    .set_pw_expire = qemu_spice_set_pw_expire,
+    .display_add_client = qemu_spice_display_add_client,
+    .add_interface = qemu_spice_add_interface,
+    .qmp_query = qmp_query_spice_real,
+};
+
 static void spice_register_config(void)
 {
+    qemu_spice = real_spice_ops;
     qemu_add_opts(&qemu_spice_opts);
 }
 opts_init(spice_register_config);

ui/spice-input.c

@@ -231,7 +231,7 @@ static void mouse_mode_notifier(Notifier *notifier, void *data)
     }
 
     if (is_absolute) {
-        qemu_spice_add_interface(&pointer->tablet.base);
+        qemu_spice.add_interface(&pointer->tablet.base);
     } else {
         spice_server_remove_interface(&pointer->tablet.base);
     }
@@ -245,13 +245,13 @@ void qemu_spice_input_init(void)
 
     kbd = g_malloc0(sizeof(*kbd));
     kbd->sin.base.sif = &kbd_interface.base;
-    qemu_spice_add_interface(&kbd->sin.base);
+    qemu_spice.add_interface(&kbd->sin.base);
     qemu_add_led_event_handler(kbd_leds, kbd);
 
     pointer = g_malloc0(sizeof(*pointer));
     pointer->mouse.base.sif  = &mouse_interface.base;
     pointer->tablet.base.sif = &tablet_interface.base;
-    qemu_spice_add_interface(&pointer->mouse.base);
+    qemu_spice.add_interface(&pointer->mouse.base);
 
     pointer->absolute = false;
     pointer->mouse_mode.notify = mouse_mode_notifier;

ui/spice-module.c

@@ -0,0 +1,85 @@
+/*
+ * spice module support, also spice stubs.
+ *
+ * Copyright (C) 2010 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "qapi/qapi-types-ui.h"
+#include "qapi/qapi-commands-ui.h"
+#include "ui/qemu-spice-module.h"
+
+int using_spice;
+
+static void qemu_spice_init_stub(void)
+{
+}
+
+static void qemu_spice_display_init_stub(void)
+{
+    /* This must never be called if CONFIG_SPICE is disabled */
+    error_report("spice support is disabled");
+    abort();
+}
+
+static int qemu_spice_migrate_info_stub(const char *h, int p, int t,
+                                        const char *s)
+{
+    return -1;
+}
+
+static int qemu_spice_set_passwd_stub(const char *passwd,
+                                      bool fail_if_connected,
+                                      bool disconnect_if_connected)
+{
+    return -1;
+}
+
+static int qemu_spice_set_pw_expire_stub(time_t expires)
+{
+    return -1;
+}
+
+static int qemu_spice_display_add_client_stub(int csock, int skipauth,
+                                              int tls)
+{
+    return -1;
+}
+
+struct QemuSpiceOps qemu_spice = {
+    .init         = qemu_spice_init_stub,
+    .display_init = qemu_spice_display_init_stub,
+    .migrate_info = qemu_spice_migrate_info_stub,
+    .set_passwd   = qemu_spice_set_passwd_stub,
+    .set_pw_expire = qemu_spice_set_pw_expire_stub,
+    .display_add_client = qemu_spice_display_add_client_stub,
+};
+
+#ifdef CONFIG_SPICE
+
+SpiceInfo *qmp_query_spice(Error **errp)
+{
+    if (!qemu_spice.qmp_query) {
+        SpiceInfo *info = g_new0(SpiceInfo, 1);
+        info->enabled = false;
+        return info;
+    }
+    return qemu_spice.qmp_query(errp);
+}
+
+#endif

util/module.c

@@ -110,7 +110,7 @@ void module_call_init(module_init_type type)
 }
 
 #ifdef CONFIG_MODULES
-static int module_load_file(const char *fname, bool mayfail)
+static int module_load_file(const char *fname, bool mayfail, bool export_symbols)
 {
     GModule *g_module;
     void (*sym)(void);
@@ -118,7 +118,7 @@ static int module_load_file(const char *fname, bool mayfail)
     int len = strlen(fname);
     int suf_len = strlen(dsosuf);
     ModuleEntry *e, *next;
-    int ret;
+    int ret, flags;
 
     if (len <= suf_len || strcmp(&fname[len - suf_len], dsosuf)) {
         /* wrong suffix */
@@ -132,7 +132,11 @@ static int module_load_file(const char *fname, bool mayfail)
 
     assert(QTAILQ_EMPTY(&dso_init_list));
 
-    g_module = g_module_open(fname, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
+    flags = G_MODULE_BIND_LAZY;
+    if (!export_symbols) {
+        flags |= G_MODULE_BIND_LOCAL;
+    }
+    g_module = g_module_open(fname, flags);
     if (!g_module) {
         if (!mayfail) {
             fprintf(stderr, "Failed to open module: %s\n",
@@ -167,6 +171,24 @@ static int module_load_file(const char *fname, bool mayfail)
 out:
     return ret;
 }
+
+static const struct {
+    const char *name;
+    const char *dep;
+} module_deps[] = {
+    { "audio-spice",    "ui-spice-core" },
+    { "chardev-spice",  "ui-spice-core" },
+    { "hw-display-qxl", "ui-spice-core" },
+    { "ui-spice-app",   "ui-spice-core" },
+    { "ui-spice-app",   "chardev-spice" },
+
+#ifdef CONFIG_OPENGL
+    { "ui-egl-headless", "ui-opengl"    },
+    { "ui-gtk",          "ui-opengl"    },
+    { "ui-sdl",          "ui-opengl"    },
+    { "ui-spice-core",   "ui-opengl"    },
+#endif
+};
 #endif
 
 bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
@@ -182,7 +204,8 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
     char *dirs[5];
     char *module_name;
     int i = 0, n_dirs = 0;
-    int ret;
+    int ret, dep;
+    bool export_symbols = false;
     static GHashTable *loaded_modules;
 
     if (!g_module_supported()) {
@@ -196,6 +219,17 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
 
     module_name = g_strdup_printf("%s%s", prefix, lib_name);
 
+    for (dep = 0; dep < ARRAY_SIZE(module_deps); dep++) {
+        if (strcmp(module_name, module_deps[dep].name) == 0) {
+            /* we depend on another module */
+            module_load_one("", module_deps[dep].dep, false);
+        }
+        if (strcmp(module_name, module_deps[dep].dep) == 0) {
+            /* another module depends on us */
+            export_symbols = true;
+        }
+    }
+
     if (!g_hash_table_add(loaded_modules, module_name)) {
         g_free(module_name);
         return true;
@@ -220,7 +254,7 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
     for (i = 0; i < n_dirs; i++) {
         fname = g_strdup_printf("%s/%s%s",
                 dirs[i], module_name, CONFIG_HOST_DSOSUF);
-        ret = module_load_file(fname, mayfail);
+        ret = module_load_file(fname, mayfail, export_symbols);
         g_free(fname);
         fname = NULL;
         /* Try loading until loaded a module file */