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Tue, 7 Jul 2020 13:42:42 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-112-200.ams2.redhat.com [10.36.112.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id 89C9860BF3; Tue, 7 Jul 2020 13:42:30 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id B284A31F0A; Tue, 7 Jul 2020 15:42:29 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 01/10] module: qom module support Date: Tue, 7 Jul 2020 15:42:20 +0200 Message-Id: <20200707134229.9773-2-kraxel@redhat.com> In-Reply-To: <20200707134229.9773-1-kraxel@redhat.com> References: <20200707134229.9773-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/07 00:31:00 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: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Gerd Hoffmann , Eduardo Habkost , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add support for qom types provided by modules. For starters use a manually maintained list which maps qom type to module and prefix. Two load functions are added: One to load the module for a specific type, and one to load all modules (needed for object/device lists as printed by -- for example -- qemu -device help). Signed-off-by: Gerd Hoffmann Message-id: 20200624131045.14512-2-kraxel@redhat.com --- include/qemu/module.h | 2 ++ util/module.c | 55 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/include/qemu/module.h b/include/qemu/module.h index 011ae1ae7605..9121a475c1b6 100644 --- a/include/qemu/module.h +++ b/include/qemu/module.h @@ -70,5 +70,7 @@ void register_dso_module_init(void (*fn)(void), module_init_type type); void module_call_init(module_init_type type); bool module_load_one(const char *prefix, const char *lib_name); +void module_load_qom_one(const char *type); +void module_load_qom_all(void); #endif diff --git a/util/module.c b/util/module.c index e48d9aacc05a..ee560a4b4269 100644 --- a/util/module.c +++ b/util/module.c @@ -245,3 +245,58 @@ bool module_load_one(const char *prefix, const char *lib_name) #endif return success; } + +/* + * Building devices and other qom objects 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 & objects. + * + * So with the expectation that this will be rather the exception than + * to rule and the list will not gain that many entries go with a + * simple manually maintained list for now. + */ +static struct { + const char *type; + const char *prefix; + const char *module; +} const qom_modules[] = { +}; + +static bool module_loaded_qom_all; + +void module_load_qom_one(const char *type) +{ + int i; + + if (module_loaded_qom_all) { + return; + } + for (i = 0; i < ARRAY_SIZE(qom_modules); i++) { + if (strcmp(qom_modules[i].type, type) == 0) { + module_load_one(qom_modules[i].prefix, + qom_modules[i].module); + return; + } + } +} + +void module_load_qom_all(void) +{ + int i; + + if (module_loaded_qom_all) { + return; + } + for (i = 0; i < ARRAY_SIZE(qom_modules); i++) { + if (i > 0 && (strcmp(qom_modules[i - 1].module, + qom_modules[i].module) == 0 && + strcmp(qom_modules[i - 1].prefix, + qom_modules[i].prefix) == 0)) { + /* one module implementing multiple types -> load only once */ + continue; + } + module_load_one(qom_modules[i].prefix, qom_modules[i].module); + } + module_loaded_qom_all = true; +}