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bh=qPB343KyU7kxiThl8E/iCJi0KCxYplSXSK26Hiy/p00=; b=SkhwQ7PCHZ33a15/aJkCrPuusoPj91Q/bozSlmmUk1xMAeswplbtV/9cWOKBSULTKkI9p0 5z2RZzQCWu0zpY+9yty6c0ACMzMduUSY0pUdqLvJqDko42n8fTnkoua2vE1WgsLas2+orE htpneVP06NTjW5WbuIofST95ra+2CFk= X-MC-Unique: MDB3GZqrOZqSm5_343yTLA-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PATCH v4 1/7] qdev: add support for device module loading Date: Mon, 22 Jun 2020 15:55:55 +0200 Message-Id: <20200622135601.12433-2-kraxel@redhat.com> In-Reply-To: <20200622135601.12433-1-kraxel@redhat.com> References: <20200622135601.12433-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.120; envelope-from=kraxel@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/22 02:57:26 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dinechin@redhat.com, Paolo Bonzini , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Gerd Hoffmann , Eduardo Habkost Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" When compiling devices as modules we'll need some infrastrtucture to actually load those modules if needed. This patch adds it. Signed-off-by: Gerd Hoffmann Reviewed-by: Richard Henderson --- include/hw/qdev-core.h | 3 +++ include/qemu/module.h | 1 + hw/core/qdev.c | 55 ++++++++++++++++++++++++++++++++++++++++++ qdev-monitor.c | 5 ++++ qom/qom-qmp-cmds.c | 5 ++++ softmmu/vl.c | 4 +++ stubs/hw-module.c | 10 ++++++++ stubs/Makefile.objs | 1 + 8 files changed, 84 insertions(+) create mode 100644 stubs/hw-module.c diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 7dc10be46f8c..0a33939f4855 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -557,4 +557,7 @@ void device_listener_unregister(DeviceListener *listene= r); */ bool qdev_should_hide_device(QemuOpts *opts); =20 +void qdev_module_load_type(const char *type); +void qdev_module_load_all(void); + #endif diff --git a/include/qemu/module.h b/include/qemu/module.h index 011ae1ae7605..077a6b09bca7 100644 --- a/include/qemu/module.h +++ b/include/qemu/module.h @@ -64,6 +64,7 @@ typedef enum { #define block_module_load_one(lib) module_load_one("block-", lib) #define ui_module_load_one(lib) module_load_one("ui-", lib) #define audio_module_load_one(lib) module_load_one("audio-", lib) +#define hw_module_load_one(lib) module_load_one("hw-", lib) =20 void register_module_init(void (*fn)(void), module_init_type type); void register_dso_module_init(void (*fn)(void), module_init_type type); diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 2131c7f951dd..6119e25e0eeb 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -137,6 +137,9 @@ void qdev_set_parent_bus(DeviceState *dev, BusState *bu= s) */ DeviceState *qdev_new(const char *name) { + if (!object_class_by_name(name)) { + qdev_module_load_type(name); + } return DEVICE(object_new(name)); } =20 @@ -147,6 +150,9 @@ DeviceState *qdev_new(const char *name) */ DeviceState *qdev_try_new(const char *name) { + if (!object_class_by_name(name)) { + qdev_module_load_type(name); + } if (!object_class_by_name(name)) { return NULL; } @@ -154,6 +160,55 @@ DeviceState *qdev_try_new(const char *name) return DEVICE(object_new(name)); } =20 +/* + * Building devices modular is mostly useful in case they have + * dependencies to external shared libraries, so we can cut down the + * core qemu library dependencies. Which is the case for only a very + * few devices. So with the expectation that this will be rather the + * exception than to rule go with a simple hardcoded list for now + * (instead of generating it automatically somehow). + */ +static struct { + const char *type; + const char *mod; +} const hwmodules[] =3D { +}; + +static bool qdev_module_loaded_all; + +void qdev_module_load_type(const char *type) +{ + int i; + + if (qdev_module_loaded_all) { + return; + } + for (i =3D 0; i < ARRAY_SIZE(hwmodules); i++) { + if (strcmp(hwmodules[i].type, type) =3D=3D 0) { + hw_module_load_one(hwmodules[i].mod); + return; + } + } +} + +void qdev_module_load_all(void) +{ + int i; + + if (qdev_module_loaded_all) { + return; + } + for (i =3D 0; i < ARRAY_SIZE(hwmodules); i++) { + if (i > 0 && strcmp(hwmodules[i - 1].mod, + hwmodules[i].mod) =3D=3D 0) { + /* one module implementing multiple devices -> load only once = */ + continue; + } + hw_module_load_one(hwmodules[i].mod); + } + qdev_module_loaded_all =3D true; +} + static QTAILQ_HEAD(, DeviceListener) device_listeners =3D QTAILQ_HEAD_INITIALIZER(device_listeners); =20 diff --git a/qdev-monitor.c b/qdev-monitor.c index 22da107484c5..86f29daa7469 100644 --- a/qdev-monitor.c +++ b/qdev-monitor.c @@ -147,6 +147,7 @@ static void qdev_print_devinfos(bool show_no_user) int i; bool cat_printed; =20 + qdev_module_load_all(); list =3D object_class_get_list_sorted(TYPE_DEVICE, false); =20 for (i =3D 0; i <=3D DEVICE_CATEGORY_MAX; i++) { @@ -224,6 +225,10 @@ static DeviceClass *qdev_get_device_class(const char *= *driver, Error **errp) oc =3D object_class_by_name(*driver); } } + if (!oc) { + qdev_module_load_type(*driver); + oc =3D object_class_by_name(*driver); + } =20 if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) { if (*driver !=3D original_name) { diff --git a/qom/qom-qmp-cmds.c b/qom/qom-qmp-cmds.c index c5249e44d020..4e0d7e53cd16 100644 --- a/qom/qom-qmp-cmds.c +++ b/qom/qom-qmp-cmds.c @@ -116,6 +116,7 @@ ObjectTypeInfoList *qmp_qom_list_types(bool has_impleme= nts, { ObjectTypeInfoList *ret =3D NULL; =20 + qdev_module_load_all(); object_class_foreach(qom_list_types_tramp, implements, abstract, &ret); =20 return ret; @@ -131,6 +132,10 @@ ObjectPropertyInfoList *qmp_device_list_properties(con= st char *typename, ObjectPropertyInfoList *prop_list =3D NULL; =20 klass =3D object_class_by_name(typename); + if (klass =3D=3D NULL) { + qdev_module_load_type(typename); + klass =3D object_class_by_name(typename); + } if (klass =3D=3D NULL) { error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, "Device '%s' not found", typename); diff --git a/softmmu/vl.c b/softmmu/vl.c index f669c06ede4a..8d753ead5983 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -1770,6 +1770,10 @@ static bool vga_interface_available(VGAInterfaceType= t) { const VGAInterfaceInfo *ti =3D &vga_interfaces[t]; =20 + if (ti->class_names[0] && !object_class_by_name(ti->class_names[0])) { + qdev_module_load_type(ti->class_names[0]); + } + assert(t < VGA_TYPE_MAX); return !ti->class_names[0] || object_class_by_name(ti->class_names[0]) || diff --git a/stubs/hw-module.c b/stubs/hw-module.c new file mode 100644 index 000000000000..58b2160b97fe --- /dev/null +++ b/stubs/hw-module.c @@ -0,0 +1,10 @@ +#include "qemu/osdep.h" +#include "hw/qdev-core.h" + +void qdev_module_load_all(void) +{ +} + +void qdev_module_load_type(const char *type) +{ +} diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs index 28e48171d1f3..7a9f38f60b78 100644 --- a/stubs/Makefile.objs +++ b/stubs/Makefile.objs @@ -5,6 +5,7 @@ stub-obj-y +=3D dump.o stub-obj-y +=3D error-printf.o stub-obj-y +=3D fdset.o stub-obj-y +=3D gdbstub.o +stub-obj-y +=3D hw-module.o stub-obj-y +=3D iothread-lock.o stub-obj-y +=3D is-daemonized.o stub-obj-$(CONFIG_LINUX_AIO) +=3D linux-aio.o --=20 2.18.4