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Wed, 7 Jul 2021 15:57:11 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap1.suse-dmz.suse.de with ESMTPSA id czcuJdfO5WAvQwAAGKfGzw (envelope-from ); Wed, 07 Jul 2021 15:57:11 +0000 Subject: Re: [PATCH v2 4/4] hw/nvme: fix controller hot unplugging To: Klaus Jensen , qemu-devel@nongnu.org References: <20210707154936.200166-1-its@irrelevant.dk> <20210707154936.200166-5-its@irrelevant.dk> From: Hannes Reinecke Message-ID: <375ea826-589f-2a18-ea0b-e3ec672a9916@suse.de> Date: Wed, 7 Jul 2021 17:57:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210707154936.200166-5-its@irrelevant.dk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=195.135.220.29; envelope-from=hare@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: Keith Busch , Klaus Jensen , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/7/21 5:49 PM, Klaus Jensen wrote: > From: Klaus Jensen > > Prior to this patch the nvme-ns devices are always children of the > NvmeBus owned by the NvmeCtrl. This causes the namespaces to be > unrealized when the parent device is removed. However, when subsystems > are involved, this is not what we want since the namespaces may be > attached to other controllers as well. > > This patch adds an additional NvmeBus on the subsystem device. When > nvme-ns devices are realized, if the parent controller device is linked > to a subsystem, the parent bus is set to the subsystem one instead. This > makes sure that namespaces are kept alive and not unrealized. > > Signed-off-by: Klaus Jensen > --- > hw/nvme/nvme.h | 15 ++++++++------- > hw/nvme/ctrl.c | 14 ++++++-------- > hw/nvme/ns.c | 18 ++++++++++++++++++ > hw/nvme/subsys.c | 3 +++ > 4 files changed, 35 insertions(+), 15 deletions(-) > > diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h > index c4065467d877..83ffabade4cf 100644 > --- a/hw/nvme/nvme.h > +++ b/hw/nvme/nvme.h > @@ -33,12 +33,20 @@ QEMU_BUILD_BUG_ON(NVME_MAX_NAMESPACES > NVME_NSID_BROADCAST - 1); > typedef struct NvmeCtrl NvmeCtrl; > typedef struct NvmeNamespace NvmeNamespace; > > +#define TYPE_NVME_BUS "nvme-bus" > +OBJECT_DECLARE_SIMPLE_TYPE(NvmeBus, NVME_BUS) > + > +typedef struct NvmeBus { > + BusState parent_bus; > +} NvmeBus; > + > #define TYPE_NVME_SUBSYS "nvme-subsys" > #define NVME_SUBSYS(obj) \ > OBJECT_CHECK(NvmeSubsystem, (obj), TYPE_NVME_SUBSYS) > > typedef struct NvmeSubsystem { > DeviceState parent_obj; > + NvmeBus bus; > uint8_t subnqn[256]; > > NvmeCtrl *ctrls[NVME_MAX_CONTROLLERS]; > @@ -365,13 +373,6 @@ typedef struct NvmeCQueue { > QTAILQ_HEAD(, NvmeRequest) req_list; > } NvmeCQueue; > > -#define TYPE_NVME_BUS "nvme-bus" > -#define NVME_BUS(obj) OBJECT_CHECK(NvmeBus, (obj), TYPE_NVME_BUS) > - > -typedef struct NvmeBus { > - BusState parent_bus; > -} NvmeBus; > - > #define TYPE_NVME "nvme" > #define NVME(obj) \ > OBJECT_CHECK(NvmeCtrl, (obj), TYPE_NVME) > diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c > index 90e3ee2b70ee..9a3b3a27c293 100644 > --- a/hw/nvme/ctrl.c > +++ b/hw/nvme/ctrl.c > @@ -6514,16 +6514,14 @@ static void nvme_exit(PCIDevice *pci_dev) > > nvme_ctrl_reset(n); > > - for (i = 1; i <= NVME_MAX_NAMESPACES; i++) { > - ns = nvme_ns(n, i); > - if (!ns) { > - continue; > + if (n->subsys) { > + for (i = 1; i <= NVME_MAX_NAMESPACES; i++) { > + ns = nvme_ns(n, i); > + if (ns) { > + ns->attached--; > + } > } > > - nvme_ns_cleanup(ns); So who is removing the namespaces, then? I would have expected some cleanup action from the subsystem, seeing that we reparent to that ... > - } > - > - if (n->subsys) { > nvme_subsys_unregister_ctrl(n->subsys, n); > } > > diff --git a/hw/nvme/ns.c b/hw/nvme/ns.c > index 3c4f5b8c714a..b7cf1494e75b 100644 > --- a/hw/nvme/ns.c > +++ b/hw/nvme/ns.c > @@ -441,6 +441,15 @@ void nvme_ns_cleanup(NvmeNamespace *ns) > } > } > > +static void nvme_ns_unrealize(DeviceState *dev) > +{ > + NvmeNamespace *ns = NVME_NS(dev); > + > + nvme_ns_drain(ns); > + nvme_ns_shutdown(ns); > + nvme_ns_cleanup(ns); > +} > + > static void nvme_ns_realize(DeviceState *dev, Error **errp) > { > NvmeNamespace *ns = NVME_NS(dev); > @@ -462,6 +471,14 @@ static void nvme_ns_realize(DeviceState *dev, Error **errp) > "linked to an nvme-subsys device"); > return; > } > + } else { > + /* > + * If this namespace belongs to a subsystem (through a link on the > + * controller device), reparent the device. > + */ > + if (!qdev_set_parent_bus(dev, &subsys->bus.parent_bus, errp)) { > + return; > + } What happens if that fails? Will we abort? Not create the namespace? > } > > if (nvme_ns_setup(ns, errp)) { > @@ -552,6 +569,7 @@ static void nvme_ns_class_init(ObjectClass *oc, void *data) > > dc->bus_type = TYPE_NVME_BUS; > dc->realize = nvme_ns_realize; > + dc->unrealize = nvme_ns_unrealize; > device_class_set_props(dc, nvme_ns_props); > dc->desc = "Virtual NVMe namespace"; > } > diff --git a/hw/nvme/subsys.c b/hw/nvme/subsys.c > index 92caa604a280..93c35950d69d 100644 > --- a/hw/nvme/subsys.c > +++ b/hw/nvme/subsys.c > @@ -50,6 +50,9 @@ static void nvme_subsys_realize(DeviceState *dev, Error **errp) > { > NvmeSubsystem *subsys = NVME_SUBSYS(dev); > > + qbus_create_inplace(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, > + dev->id); > + > nvme_subsys_setup(subsys); > } > > Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@suse.de +49 911 74053 688 SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer