From patchwork Thu Dec 21 21:23:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13502630 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2A4F9C35274 for ; Thu, 21 Dec 2023 21:26:11 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rGQXl-0003SK-G9; Thu, 21 Dec 2023 16:25:25 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rGQXX-0002QM-55 for qemu-devel@nongnu.org; Thu, 21 Dec 2023 16:25:12 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rGQXU-0008V5-Dw for qemu-devel@nongnu.org; Thu, 21 Dec 2023 16:25:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1703193907; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TMc9ri3NlPqmCWRh+Ny7G+u+5ZyJjNoRDOb/vrYfrNo=; b=WmTSdbmD1L4oiKzNlZ5rm57J20BlRwlhv/eXymWKghr0xhqzvHsNMOFs6xVZ5DyX4sM5gt Uw73iyfjGzY+g5lkCFgSDjXp8ySc8UVVpkATF/0yKNF075KvlZBCEPfdTU3EpUoGBP1hmY n6AT8V1QG15S7ZM3Yyqr4U2kZrnsNOY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-561-hRlO7qbRMGyI5zVbOW0MCA-1; Thu, 21 Dec 2023 16:25:05 -0500 X-MC-Unique: hRlO7qbRMGyI5zVbOW0MCA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AF77C1019C8D; Thu, 21 Dec 2023 21:25:04 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.193.128]) by smtp.corp.redhat.com (Postfix) with ESMTP id ABFF1C15A0C; Thu, 21 Dec 2023 21:25:01 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PULL 32/33] qdev: add IOThreadVirtQueueMappingList property type Date: Thu, 21 Dec 2023 22:23:37 +0100 Message-ID: <20231221212339.164439-33-kwolf@redhat.com> In-Reply-To: <20231221212339.164439-1-kwolf@redhat.com> References: <20231221212339.164439-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.061, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Stefan Hajnoczi 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 Message-ID: <20231220134755.814917-4-stefanha@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- qapi/virtio.json | 29 ++++++++++++++++++ include/hw/qdev-properties-system.h | 5 ++++ hw/core/qdev-properties-system.c | 46 +++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+) diff --git a/qapi/virtio.json b/qapi/virtio.json index e6dcee7b83..19c7c36e36 100644 --- a/qapi/virtio.json +++ b/qapi/virtio.json @@ -928,3 +928,32 @@ '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: 9.0 +## + +{ 'struct': 'IOThreadVirtQueueMapping', + 'data': { 'iothread': 'str', '*vqs': ['uint16'] } } + +## +# @DummyVirtioForceArrays: +# +# Not used by QMP; hack to let us use IOThreadVirtQueueMappingList internally +# +# Since: 9.0 +## + +{ 'struct': 'DummyVirtioForceArrays', + 'data': { 'unused-iothread-vq-mapping': ['IOThreadVirtQueueMapping'] } } diff --git a/include/hw/qdev-properties-system.h b/include/hw/qdev-properties-system.h index 91f7a2452d..06c359c190 100644 --- a/include/hw/qdev-properties-system.h +++ b/include/hw/qdev-properties-system.h @@ -24,6 +24,7 @@ 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_cpus390entitlement; +extern const PropertyInfo qdev_prop_iothread_vq_mapping_list; #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t) @@ -82,4 +83,8 @@ extern const PropertyInfo qdev_prop_cpus390entitlement; DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_cpus390entitlement, \ CpuS390Entitlement) +#define DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST(_name, _state, _field) \ + DEFINE_PROP(_name, _state, _field, qdev_prop_iothread_vq_mapping_list, \ + IOThreadVirtQueueMappingList *) + #endif diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 73cced4626..1a396521d5 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" @@ -1160,3 +1161,48 @@ const PropertyInfo qdev_prop_cpus390entitlement = { .set = qdev_propinfo_set_enum, .set_default_value = qdev_propinfo_set_default_value_enum, }; + +/* --- IOThreadVirtQueueMappingList --- */ + +static void get_iothread_vq_mapping_list(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + IOThreadVirtQueueMappingList **prop_ptr = + object_field_prop_ptr(obj, opaque); + + visit_type_IOThreadVirtQueueMappingList(v, name, prop_ptr, errp); +} + +static void set_iothread_vq_mapping_list(Object *obj, Visitor *v, + const char *name, void *opaque, Error **errp) +{ + IOThreadVirtQueueMappingList **prop_ptr = + object_field_prop_ptr(obj, opaque); + IOThreadVirtQueueMappingList *list; + + if (!visit_type_IOThreadVirtQueueMappingList(v, name, &list, errp)) { + return; + } + + qapi_free_IOThreadVirtQueueMappingList(*prop_ptr); + *prop_ptr = list; +} + +static void release_iothread_vq_mapping_list(Object *obj, + const char *name, void *opaque) +{ + IOThreadVirtQueueMappingList **prop_ptr = + object_field_prop_ptr(obj, opaque); + + qapi_free_IOThreadVirtQueueMappingList(*prop_ptr); + *prop_ptr = NULL; +} + +const PropertyInfo qdev_prop_iothread_vq_mapping_list = { + .name = "IOThreadVirtQueueMappingList", + .description = "IOThread virtqueue mapping list [{\"iothread\":\"\", " + "\"vqs\":[1,2,3,...]},...]", + .get = get_iothread_vq_mapping_list, + .set = set_iothread_vq_mapping_list, + .release = release_iothread_vq_mapping_list, +};