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Tsirkin" , Hanna Reitz Subject: [PATCH v2 1/2] qdev: add IOThreadVirtQueueMappingList property type Date: Mon, 18 Sep 2023 12:16:03 -0400 Message-ID: <20230918161604.1400051-2-stefanha@redhat.com> In-Reply-To: <20230918161604.1400051-1-stefanha@redhat.com> References: <20230918161604.1400051-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 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=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1695053830427100001 Content-Type: text/plain; charset="utf-8" virtio-blk and virtio-scsi devices will need a way to specify the mapping between IOThreads and virtqueues. At the moment all virtqueues are assigned to a single IOThread or the main loop. This single thread can be a CPU bottleneck, so it is necessary to allow finer-grained assignment to spread the load. Introduce DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST() so devices can take a parameter that maps virtqueues to IOThreads. The command-line syntax for this new property is as follows: --device '{"driver":"foo","iothread-vq-mapping":[{"iothread":"iothread0",= "vqs":[0,1,2]},...]}' IOThreads are specified by name and virtqueues are specified by 0-based index. It will be common to simply assign virtqueues round-robin across a set of IOThreads. A convenient syntax that does not require specifying individual virtqueue indices is available: --device '{"driver":"foo","iothread-vq-mapping":[{"iothread":"iothread0"}= ,{"iothread":"iothread1"},...]}' Signed-off-by: Stefan Hajnoczi --- qapi/virtio.json | 30 ++++++++++++++++++ include/hw/qdev-properties-system.h | 4 +++ hw/core/qdev-properties-system.c | 47 +++++++++++++++++++++++++++++ 3 files changed, 81 insertions(+) diff --git a/qapi/virtio.json b/qapi/virtio.json index e6dcee7b83..cb341ae596 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -928,3 +928,33 @@ 'data': { 'path': 'str', 'queue': 'uint16', '*index': 'uint16' }, 'returns': 'VirtioQueueElement', 'features': [ 'unstable' ] } + +## +# @IOThreadVirtQueueMapping: +# +# Describes the subset of virtqueues assigned to an IOThread. +# +# @iothread: the id of IOThread object +# @vqs: an optional array of virtqueue indices that will be handled by this +# IOThread. When absent, virtqueues are assigned round-robin across = all +# IOThreadVirtQueueMappings provided. Either all +# IOThreadVirtQueueMappings must have @vqs or none of them must have= it. +# +# Since: 8.2 +# +## + +{ 'struct': 'IOThreadVirtQueueMapping', + 'data': { 'iothread': 'str', '*vqs': ['uint16'] } } + +## +# @IOThreadVirtQueueMappings: +# +# IOThreadVirtQueueMapping list. This struct is not actually used but the +# IOThreadVirtQueueMappingList type it generates is! +# +# Since: 8.2 +## + +{ 'struct': 'IOThreadVirtQueueMappings', + 'data': { 'mappings': ['IOThreadVirtQueueMapping'] } } diff --git a/include/hw/qdev-properties-system.h b/include/hw/qdev-properti= es-system.h index 0ac327ae60..c526e502c8 100644 --- a/include/hw/qdev-properties-system.h +++ b/include/hw/qdev-properties-system.h @@ -22,6 +22,7 @@ extern const PropertyInfo qdev_prop_audiodev; extern const PropertyInfo qdev_prop_off_auto_pcibar; extern const PropertyInfo qdev_prop_pcie_link_speed; extern const PropertyInfo qdev_prop_pcie_link_width; +extern const PropertyInfo qdev_prop_iothread_vq_mapping_list; =20 #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t) @@ -73,5 +74,8 @@ extern const PropertyInfo qdev_prop_pcie_link_width; #define DEFINE_PROP_UUID_NODEFAULT(_name, _state, _field) \ DEFINE_PROP(_name, _state, _field, qdev_prop_uuid, QemuUUID) =20 +#define DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST(_name, _state, _field) \ + DEFINE_PROP(_name, _state, _field, qdev_prop_iothread_vq_mapping_list,= \ + IOThreadVirtQueueMappingList *) =20 #endif diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-sys= tem.c index 6d5d43eda2..831796e106 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -18,6 +18,7 @@ #include "qapi/qapi-types-block.h" #include "qapi/qapi-types-machine.h" #include "qapi/qapi-types-migration.h" +#include "qapi/qapi-visit-virtio.h" #include "qapi/qmp/qerror.h" #include "qemu/ctype.h" #include "qemu/cutils.h" @@ -1147,3 +1148,49 @@ const PropertyInfo qdev_prop_uuid =3D { .set =3D set_uuid, .set_default_value =3D set_default_uuid_auto, }; + +/* --- IOThreadVirtQueueMappingList --- */ + +static void get_iothread_vq_mapping_list(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + IOThreadVirtQueueMappingList **prop_ptr =3D + object_field_prop_ptr(obj, opaque); + IOThreadVirtQueueMappingList *list =3D *prop_ptr; + + visit_type_IOThreadVirtQueueMappingList(v, name, &list, errp); +} + +static void set_iothread_vq_mapping_list(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + IOThreadVirtQueueMappingList **prop_ptr =3D + object_field_prop_ptr(obj, opaque); + IOThreadVirtQueueMappingList *list; + + if (!visit_type_IOThreadVirtQueueMappingList(v, name, &list, errp)) { + return; + } + + qapi_free_IOThreadVirtQueueMappingList(*prop_ptr); + *prop_ptr =3D list; +} + +static void release_iothread_vq_mapping_list(Object *obj, + const char *name, void *opaque) +{ + IOThreadVirtQueueMappingList **prop_ptr =3D + object_field_prop_ptr(obj, opaque); + + qapi_free_IOThreadVirtQueueMappingList(*prop_ptr); + *prop_ptr =3D NULL; +} + +const PropertyInfo qdev_prop_iothread_vq_mapping_list =3D { + .name =3D "IOThreadVirtQueueMappingList", + .description =3D "IOThread virtqueue mapping list [{\"iothread\":\"\", " + "\"vqs\":[1,2,3,...]},...]", + .get =3D get_iothread_vq_mapping_list, + .set =3D set_iothread_vq_mapping_list, + .release =3D release_iothread_vq_mapping_list, +}; --=20 2.41.0