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[2a01:cb00:1411:4800:4df9:ec80:d3fa:1cac]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-43d1e4e5890sm62750308f8f.31.2026.04.08.23.01.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Apr 2026 23:01:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=minio.io; s=minio; t=1775714513; x=1776319313; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ef/IDwXK0GaH8OkKz0gZMKyBYmbEr0v7UmTk+WfXTa0=; b=QKEfJjZkxx9zjFv1mwhg0rTFwC4kiecz3v7DdoR7FRlUx2bPnTLNwY9zorxfVb1prg x+5bYjrWFMBxUx4aLvy0js33P3QFfMGzodYMqGwhiMR90c5Q/xtAWxlPWHimGW3RlaZr cDadRtt8bySzPlS1MNGkS58SMVFjnziHi9TQmyxaGZB/uaZqIc6ucx2M+PN1aFbzvbLv TyVSUNmiUk5dV445yr4LUIMdy9a84EumzI1yHm4gRH56kHwfDUlY7uatl7m3qcXZ/gRv A1FnHMaZI625B7hApFywl5YWaRKLmuSM238rX25Ye70agSUaH1/4qhhp0X9JJgIG/DVx eEmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775714513; x=1776319313; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=ef/IDwXK0GaH8OkKz0gZMKyBYmbEr0v7UmTk+WfXTa0=; b=T1p/hSMxzNGHSABr7RUQorG/zrnuEXiCF6Wi/pwe9z4a0Vuqh3d5J4i0W+xNzoTQzK QUiHFmvsHi862OcVxtbfbQFK+au1TaioO879mQNvE8IXH9SIxlJg6RQKJT/AwT3gGpk1 SyifkHrs06TM+rL5SnHKq5BD0ck9B5FvZ2NwK71/oPzlLh+DExVmfArj6JSqo5bA9wJz CkoWZbIooVptzRnmwBJ+WC/VouqopDERo/iopuZ62K3d76wTokaZNu2HJ+23gkwRCC1+ WrsFhtjWNjoNDfMNCS68xYJzRVee7BACMsVUIY1g9ga1QTMI8bW6GI27EB6milTsyjr+ 0itQ== X-Gm-Message-State: AOJu0YwU5USTYY6/lRi7AYads4nm7PJAo/oV9yKs/t/07URmaHpHcqY3 Vi5GhpEhD6zl0sYfgor5+xpLSXyTJAB7dhiOjlCGdswmqWVpUhwHxfFGn438heSAvaOO7IqOLF5 DLwdWnwbeOa4lJh/WAq+6D/FztuBrzQ5yUybEByLbkts3dXpIJN+c3ZB1L9HHrjivxphF58c1lT e/HbDDdgwkqUo5QJKmZfhkJsxyVRLH0QO51NQkjkg= X-Gm-Gg: AeBDieuZvzLucpQPifSuuhRPhHGAR26GtYpc7KedrZ9AKpEjuyG4OpJK+9SNsQoAEr5 9XR54fPLRe1bohQ0FOUSesd0PfNC3TO617c6RJrcpZi1+759y5XXqy8dTiXVaF2XrNNryezbmGK /VNlbSdbBC3Ek5zQv3PMB7MnvmXrYsdsp6L/leg50qAn9zEgJIv3MweGkEU2qJqNvO/IZkkbLpV Y30i6h8Uud465+I3TLD5f1Eyb1gJYr6tzSifDN3Mp9KsRTv7/8Lieuni95qPFqMHPoLB5ZkeOfT 2JjqWjlGz0Cw6MlvD1BOCVmR/ZowbWxNuem29otHvQeacb1BhstAr3Q+2MQFnYfYDnht7vyL8sS Qk/rYQ3q2bUGbfMeeeFhSckPgpuT7aDAXncm9afZg+4g05WwHpKBD7ZXMPMJ2qhWaygx7ujXOkf SRsGwPeOzQCRXt/u0mxQ4MJJ/878M6Sq//MiJ40lca5sWWluBJd24iqQ4nd9OOHNBeeLE6a+1iS c6X4t2Pz0IOhfQ93Ye1xKudWNgKS507A0nMr1phh7mDMNNYYFhjUThdqNbi7Q== X-Received: by 2002:a5d:5847:0:b0:43c:f8b4:e58 with SMTP id ffacd0b85a97d-43d292e2a9emr36065425f8f.41.1775714513163; Wed, 08 Apr 2026 23:01:53 -0700 (PDT) From: mr-083 X-Google-Original-From: mr-083 To: qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: its@irrelevant.dk, kbusch@kernel.org, stefanha@redhat.com, mr-083 Subject: [PATCH 1/2] hw/nvme: add namespace hotplug support Date: Thu, 9 Apr 2026 08:01:53 +0200 Message-ID: <20260409060155.94704-2-matthieu@min.io> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260409060155.94704-1-matthieu@min.io> References: <20260409060155.94704-1-matthieu@min.io> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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=2a00:1450:4864:20::42b; envelope-from=matthieu@minio.io; helo=mail-wr1-x42b.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_NAME_MR_MRS=0.998, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Thu, 09 Apr 2026 04:19:18 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @minio.io) X-ZM-MESSAGEID: 1775722829487154100 Add hotplug support for nvme-ns devices on the NvmeBus. This enables namespace-level hot-swap without removing the NVMe controller, which is how physical NVMe drives behave when hot-swapped in the same PCIe slot. Mark nvme-ns devices as hotpluggable and register the NvmeBus as a hotplug handler with proper plug and unplug callbacks: - plug: attach namespace to all started controllers and send an Asynchronous Event Notification (AEN) with NS_ATTR_CHANGED so the guest kernel rescans namespaces - unplug: detach from all controllers, send AEN, remove from subsystem, then unrealize the device The plug handler skips controllers that haven't started yet (qs_created =3D=3D false) to avoid interfering with boot-time namespace attachment in nvme_start_ctrl(). Both the controller bus and subsystem bus are configured as hotplug handlers via qbus_set_bus_hotplug_handler() since nvme-ns devices may reparent to the subsystem bus during realize. Signed-off-by: Matthieu Receveur --- hw/nvme/ctrl.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++ hw/nvme/ns.c | 1 + hw/nvme/subsys.c | 2 ++ 3 files changed, 88 insertions(+) diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c index be6c7028cb..5502e4ea2b 100644 --- a/hw/nvme/ctrl.c +++ b/hw/nvme/ctrl.c @@ -206,6 +206,7 @@ #include "system/hostmem.h" #include "hw/pci/msix.h" #include "hw/pci/pcie_sriov.h" +#include "hw/core/qdev.h" #include "system/spdm-socket.h" #include "migration/vmstate.h" =20 @@ -9293,6 +9294,7 @@ static void nvme_realize(PCIDevice *pci_dev, Error **= errp) } =20 qbus_init(&n->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id); + qbus_set_bus_hotplug_handler(BUS(&n->bus)); =20 if (nvme_init_subsys(n, errp)) { return; @@ -9553,10 +9555,93 @@ static const TypeInfo nvme_info =3D { }, }; =20 +static void nvme_ns_hot_plug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp) +{ + NvmeNamespace *ns =3D NVME_NS(dev); + NvmeSubsystem *subsys =3D ns->subsys; + uint32_t nsid =3D ns->params.nsid; + int i; + + /* + * Attach to all started controllers and notify via AEN. + * Skip controllers that haven't started yet (boot-time realize) =E2= =80=94 + * nvme_start_ctrl() will attach namespaces during controller init. + */ + for (i =3D 0; i < NVME_MAX_CONTROLLERS; i++) { + NvmeCtrl *ctrl =3D nvme_subsys_ctrl(subsys, i); + if (!ctrl || !ctrl->qs_created) { + continue; + } + + if (nvme_csi_supported(ctrl, ns->csi) && !ns->params.detached) { + nvme_attach_ns(ctrl, ns); + nvme_update_dsm_limits(ctrl, ns); + + if (!test_and_set_bit(nsid, ctrl->changed_nsids)) { + nvme_enqueue_event(ctrl, NVME_AER_TYPE_NOTICE, + NVME_AER_INFO_NOTICE_NS_ATTR_CHANGED, + NVME_LOG_CHANGED_NSLIST); + } + } + } +} + +static void nvme_ns_hot_unplug(HotplugHandler *hotplug_dev, DeviceState *d= ev, + Error **errp) +{ + NvmeNamespace *ns =3D NVME_NS(dev); + NvmeSubsystem *subsys =3D ns->subsys; + uint32_t nsid =3D ns->params.nsid; + int i; + + /* + * Detach from all controllers and notify the guest via AEN. + * Must happen before unrealize to avoid use-after-free when the + * guest sends I/O to a freed namespace. + */ + for (i =3D 0; i < NVME_MAX_CONTROLLERS; i++) { + NvmeCtrl *ctrl =3D nvme_subsys_ctrl(subsys, i); + if (!ctrl || !nvme_ns(ctrl, nsid)) { + continue; + } + + nvme_detach_ns(ctrl, ns); + nvme_update_dsm_limits(ctrl, NULL); + + if (!test_and_set_bit(nsid, ctrl->changed_nsids)) { + nvme_enqueue_event(ctrl, NVME_AER_TYPE_NOTICE, + NVME_AER_INFO_NOTICE_NS_ATTR_CHANGED, + NVME_LOG_CHANGED_NSLIST); + } + } + + /* Remove from subsystem namespace list. */ + subsys->namespaces[nsid] =3D NULL; + + /* + * Unrealize: drain I/O, flush, cleanup structures, remove from QOM. + * nvme_ns_unrealize() handles drain/shutdown/cleanup internally. + */ + qdev_unrealize(dev); +} + +static void nvme_bus_class_init(ObjectClass *klass, const void *data) +{ + HotplugHandlerClass *hc =3D HOTPLUG_HANDLER_CLASS(klass); + hc->plug =3D nvme_ns_hot_plug; + hc->unplug =3D nvme_ns_hot_unplug; +} + static const TypeInfo nvme_bus_info =3D { .name =3D TYPE_NVME_BUS, .parent =3D TYPE_BUS, .instance_size =3D sizeof(NvmeBus), + .class_init =3D nvme_bus_class_init, + .interfaces =3D (const InterfaceInfo[]) { + { TYPE_HOTPLUG_HANDLER }, + { } + }, }; =20 static void nvme_register_types(void) diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c index b0106eaa5c..eb628c0734 100644 --- a/hw/nvme/ns.c +++ b/hw/nvme/ns.c @@ -937,6 +937,7 @@ static void nvme_ns_class_init(ObjectClass *oc, const v= oid *data) dc->bus_type =3D TYPE_NVME_BUS; dc->realize =3D nvme_ns_realize; dc->unrealize =3D nvme_ns_unrealize; + dc->hotpluggable =3D true; device_class_set_props(dc, nvme_ns_props); dc->desc =3D "Virtual NVMe namespace"; } diff --git a/hw/nvme/subsys.c b/hw/nvme/subsys.c index 777e1c620f..fa35055d3c 100644 --- a/hw/nvme/subsys.c +++ b/hw/nvme/subsys.c @@ -9,6 +9,7 @@ #include "qemu/osdep.h" #include "qemu/units.h" #include "qapi/error.h" +#include "hw/core/qdev.h" =20 #include "nvme.h" =20 @@ -205,6 +206,7 @@ static void nvme_subsys_realize(DeviceState *dev, Error= **errp) NvmeSubsystem *subsys =3D NVME_SUBSYS(dev); =20 qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id); + qbus_set_bus_hotplug_handler(BUS(&subsys->bus)); =20 nvme_subsys_setup(subsys, errp); } --=20 2.50.1 (Apple Git-155)