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[199.106.103.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33c331aef9bsm12007386eec.25.2026.09.20.05.24.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Sep 2026 05:24:57 -0700 (PDT) From: Linlin Zhang To: mst@redhat.com, jasowangio@gmail.com, axboe@kernel.dk, ebiggers@kernel.org, stefanha@redhat.com Cc: pbonzini@redhat.com, eperezma@redhat.com, xuanzhuo@linux.alibaba.com, virtualization@lists.linux.dev, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/2] virtio_blk: Add control virtqueue support Date: Sun, 20 Sep 2026 05:24:31 -0700 Message-ID: <20260920122444.2549493-2-linlin.zhang@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260920122444.2549493-1-linlin.zhang@oss.qualcomm.com> References: <20260920122444.2549493-1-linlin.zhang@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-ORIG-GUID: uVYrphYdYzEkCrvDwuQs5skBSCohL_7W X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIwMDE4MCBTYWx0ZWRfX4hrjleT8SXmp EL5GkKsnZA0g2ppvdIC8won6l0JdyAzBI06+4ofea1C940EpWDfEddzOJFqE0vlEpy/JU5PmOtt K4mrZhrQSsNflJ4kVfQc7b9S/UvaPrNjWr40yo9qWGOCKB8c4/zbbxwmRPqPd/02+SrLBPnvbGU 3b1IveZbWLuCiqZMJZcnCitMUFsiIvh0MkK9oYwAJNbuaIPtSTH7jtdJkioUpMXgvswaYa0ra41 EXH38kTb8BDBRLu+r2n0YcPZ/G4gd3lAnmsidbQJwfvVdBWBhOYsu5+67s8zq+nyN89/l45Eq7d RMTPXfgLbWW0KsGIDMAne/9pqkhqBhB8EDSo4bkRvA6cnTWwNu3o7JtWCB9v66kAT8QMCUgfi+L chAu+RGRI7ATP3mruXDgg9ziJSEkilPzdzc0G0UqsNPPPhfr3iZPByhuZkOA5Qf5lVOotHwjHvx TCgBc56miDLWDeE8+9Q== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIwMDE4MCBTYWx0ZWRfX1L09C0uVbdpA anpe32KTXH5NVgOCMiJDQfv2TOhN1o55n87hMQl/4JoRXHK5WDO94jOOXrHr2GiM1B54RKQEn7N 2p1ypHLsrYQil0bJ8PI2xYs6nF4MpJw= X-Authority-Analysis: v=2.4 cv=BKAmP1QG c=1 sm=1 tr=0 ts=6aafd09a cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=JYp8KDb2vCoCEuGobkYCKw==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=mWMrKjBDJ3x8XhIyD1MA:9 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-GUID: uVYrphYdYzEkCrvDwuQs5skBSCohL_7W X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-20_04,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609200180 From: linlzhan Add support for the optional virtio-blk control virtqueue. If control queue feature bit is negociated, this allows the driver to manage control-queue requests independently from the data path and to safely handle outstanding requests during device removal and suspend. No control command is submitted by this change. The control virtqueue will be used by a subsequent inline encryption implementation. Signed-off-by: linlzhan --- drivers/block/virtio_blk.c | 241 +++++++++++++++++++++++++++++++- include/uapi/linux/virtio_blk.h | 1 + 2 files changed, 238 insertions(+), 4 deletions(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 32bf3ba07a9d..2fad86e8f7a9 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include #include @@ -52,6 +53,15 @@ struct virtio_blk_vq { char name[VQ_NAME_LEN]; } ____cacheline_aligned_in_smp; +struct virtio_blk_ctrl_vq { + struct virtqueue *vq; + struct mutex mutex; + spinlock_t lock; + unsigned int inflight; + bool dead; + struct completion drained; +}; + struct virtio_blk { /* * This mutex must be held by anything that may run after @@ -83,6 +93,9 @@ struct virtio_blk { /* For zoned device */ unsigned int zone_sectors; + + /* Control virtqueue state. */ + struct virtio_blk_ctrl_vq ctrl_vq; }; struct virtblk_req { @@ -110,6 +123,20 @@ struct virtblk_req { struct scatterlist sg[]; }; +struct virtblk_ctrl_request { + __virtio32 type; + u8 status; + + struct completion *compl; + /* + * Set when virtblk_ctrl_vq_request()'s waiter timed out and moved on + * without freeing this request. Whichever of virtblk_ctrlq_callback() + * or virtblk_ctrl_vq_drain() later retrieves the buffer must free + * @compl and this struct instead of calling complete() on them. + */ + bool abandoned; +}; + static inline blk_status_t virtblk_result(u8 status) { switch (status) { @@ -863,11 +890,184 @@ static int virtblk_getgeo(struct gendisk *disk, struct hd_geometry *geo) return ret; } +#define VIRTBLK_CTRL_VQ_TIMEOUT (10 * HZ) + +/* Prevent new submissions and wait for in-flight requests to complete. */ +static void virtblk_ctrl_vq_quiesce(struct virtio_blk *vblk) +{ + unsigned long flags; + bool need_wait; + + if (!vblk->ctrl_vq.vq) + return; + + init_completion(&vblk->ctrl_vq.drained); + + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + vblk->ctrl_vq.dead = true; + need_wait = vblk->ctrl_vq.inflight != 0; + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + + if (need_wait && + !wait_for_completion_timeout(&vblk->ctrl_vq.drained, + VIRTBLK_CTRL_VQ_TIMEOUT)) + dev_warn(&vblk->vdev->dev, + "timed out waiting for control queue requests to complete\n"); +} + +/* Fail requests left in the control queue after reset. */ +static void virtblk_ctrl_vq_drain(struct virtio_blk *vblk) +{ + struct virtblk_ctrl_request *creq; + unsigned long flags; + + if (!vblk->ctrl_vq.vq) + return; + + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + while ((creq = virtqueue_detach_unused_buf(vblk->ctrl_vq.vq)) != NULL) { + bool abandoned = creq->abandoned; + + if (WARN_ON_ONCE(!vblk->ctrl_vq.inflight)) + ; + else + vblk->ctrl_vq.inflight--; + if (!abandoned) + creq->status = VIRTIO_BLK_S_IOERR; + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + if (abandoned) { + kfree(creq->compl); + kfree(creq); + } else { + complete(creq->compl); + } + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + } + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); +} + +static void virtblk_ctrlq_callback(struct virtqueue *vq) +{ + struct virtio_blk *vblk = vq->vdev->priv; + struct virtblk_ctrl_request *creq; + unsigned long flags; + unsigned int len; + + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + do { + virtqueue_disable_cb(vq); + while ((creq = virtqueue_get_buf(vq, &len)) != NULL) { + bool drained = false; + bool abandoned = creq->abandoned; + + if (WARN_ON_ONCE(!vblk->ctrl_vq.inflight)) { + /* + * Still resolve the request. Never leave a + * synchronous caller blocked because the accounting + * state was already inconsistent. + */ + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + if (abandoned) { + kfree(creq->compl); + kfree(creq); + } else { + complete(creq->compl); + } + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + continue; + } + + if (--vblk->ctrl_vq.inflight == 0 && vblk->ctrl_vq.dead) + drained = true; + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + if (drained) + complete(&vblk->ctrl_vq.drained); + if (abandoned) { + kfree(creq->compl); + kfree(creq); + } else { + complete(creq->compl); + } + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + } + } while (!virtqueue_enable_cb(vq)); + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); +} + +/* Submit a control-queue request and wait for completion. */ +static int virtblk_ctrl_vq_request(struct virtio_blk *vblk, + struct virtblk_ctrl_request *creq, + struct scatterlist *sgs[], + unsigned int out_sgs, unsigned int in_sgs) +{ + struct completion *comp; + unsigned long flags; + int err; + + /* + * GFP_NOIO: this may be reached on the bio-submission path + * (memory reclaim writing back dirty pages to this same device), + * so GFP_KERNEL could self-deadlock. + */ + comp = kmalloc_obj(*comp, GFP_NOIO); + if (!comp) + return -ENOMEM; + init_completion(comp); + + mutex_lock(&vblk->ctrl_vq.mutex); + creq->compl = comp; + creq->abandoned = false; + + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + if (vblk->ctrl_vq.dead) { + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + mutex_unlock(&vblk->ctrl_vq.mutex); + kfree(comp); + return -ENODEV; + } + err = virtqueue_add_sgs(vblk->ctrl_vq.vq, sgs, out_sgs, in_sgs, creq, GFP_ATOMIC); + if (!err) { + vblk->ctrl_vq.inflight++; + virtqueue_kick(vblk->ctrl_vq.vq); + } + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + if (err) { + mutex_unlock(&vblk->ctrl_vq.mutex); + kfree(comp); + return err; + } + + if (wait_for_completion_timeout(comp, VIRTBLK_CTRL_VQ_TIMEOUT)) { + mutex_unlock(&vblk->ctrl_vq.mutex); + kfree(comp); + return 0; + } + + /* + * The host hasn't responded within the timeout. @creq is still + * owned by the device, so don't touch its DMA-target fields or + * free it here. Mark it abandoned and hand ownership of both @creq + * and @comp to whichever of virtblk_ctrlq_callback() or + * virtblk_ctrl_vq_drain() retrieves the buffer later; unlock the + * mutex so subsequent requests aren't serialized behind an + * unresponsive host. + */ + spin_lock_irqsave(&vblk->ctrl_vq.lock, flags); + creq->abandoned = true; + spin_unlock_irqrestore(&vblk->ctrl_vq.lock, flags); + mutex_unlock(&vblk->ctrl_vq.mutex); + + dev_warn(&vblk->vdev->dev, + "control queue request timed out, abandoning\n"); + return -ETIMEDOUT; +} + static void virtblk_free_disk(struct gendisk *disk) { struct virtio_blk *vblk = disk->private_data; ida_free(&vd_index_ida, vblk->index); + mutex_destroy(&vblk->ctrl_vq.mutex); mutex_destroy(&vblk->vdev_mutex); kfree(vblk); } @@ -965,6 +1165,8 @@ static int init_vq(struct virtio_blk *vblk) struct virtqueue **vqs; unsigned short num_vqs; unsigned short num_poll_vqs; + unsigned short total_vqs; + bool has_ctrl_vq; struct virtio_device *vdev = vblk->vdev; struct irq_affinity desc = { 0, }; @@ -993,12 +1195,19 @@ static int init_vq(struct virtio_blk *vblk) vblk->io_queues[HCTX_TYPE_READ], vblk->io_queues[HCTX_TYPE_POLL]); + /* + * The control vq is appended after the data vqs whenever + * F_CTRL_VQ is negotiated. + */ + has_ctrl_vq = virtio_has_feature(vdev, VIRTIO_BLK_F_CTRL_VQ); + total_vqs = num_vqs + (has_ctrl_vq ? 1 : 0); + vblk->vqs = kmalloc_objs(*vblk->vqs, num_vqs); if (!vblk->vqs) return -ENOMEM; - vqs_info = kzalloc_objs(*vqs_info, num_vqs); - vqs = kmalloc_objs(*vqs, num_vqs); + vqs_info = kzalloc_objs(*vqs_info, total_vqs); + vqs = kmalloc_objs(*vqs, total_vqs); if (!vqs_info || !vqs) { err = -ENOMEM; goto out; @@ -1015,8 +1224,13 @@ static int init_vq(struct virtio_blk *vblk) vqs_info[i].name = vblk->vqs[i].name; } + if (has_ctrl_vq) { + vqs_info[num_vqs].callback = virtblk_ctrlq_callback; + vqs_info[num_vqs].name = "control"; + } + /* Discover virtqueues and write information to configuration. */ - err = virtio_find_vqs(vdev, num_vqs, vqs, vqs_info, &desc); + err = virtio_find_vqs(vdev, total_vqs, vqs, vqs_info, &desc); if (err) goto out; @@ -1025,6 +1239,9 @@ static int init_vq(struct virtio_blk *vblk) vblk->vqs[i].vq = vqs[i]; } vblk->num_vqs = num_vqs; + vblk->ctrl_vq.vq = has_ctrl_vq ? vqs[num_vqs] : NULL; + vblk->ctrl_vq.dead = false; + vblk->ctrl_vq.inflight = 0; out: kfree(vqs); @@ -1464,14 +1681,18 @@ static int virtblk_probe(struct virtio_device *vdev) } mutex_init(&vblk->vdev_mutex); + mutex_init(&vblk->ctrl_vq.mutex); + spin_lock_init(&vblk->ctrl_vq.lock); vblk->vdev = vdev; INIT_WORK(&vblk->config_work, virtblk_config_changed_work); err = init_vq(vblk); - if (err) + if (err) { + dev_err(&vdev->dev, "init virt queue failed: err = %d\n", err); goto out_free_vblk; + } /* Default queue sizing is to fill the ring. */ if (!virtblk_queue_depth) { @@ -1553,6 +1774,7 @@ static int virtblk_probe(struct virtio_device *vdev) out_free_vq: vdev->config->del_vqs(vdev); kfree(vblk->vqs); + vblk->ctrl_vq.vq = NULL; out_free_vblk: kfree(vblk); out_free_index: @@ -1571,16 +1793,21 @@ static void virtblk_remove(struct virtio_device *vdev) del_gendisk(vblk->disk); blk_mq_free_tag_set(&vblk->tag_set); + virtblk_ctrl_vq_quiesce(vblk); + mutex_lock(&vblk->vdev_mutex); /* Stop all the virtqueues. */ virtio_reset_device(vdev); + virtblk_ctrl_vq_drain(vblk); /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */ vblk->vdev = NULL; vdev->config->del_vqs(vdev); kfree(vblk->vqs); + vblk->vqs = NULL; + vblk->ctrl_vq.vq = NULL; mutex_unlock(&vblk->vdev_mutex); @@ -1593,13 +1820,17 @@ static int virtblk_freeze_priv(struct virtio_device *vdev) struct request_queue *q = vblk->disk->queue; unsigned int memflags; + /* Ensure no requests in virtqueues before deleting vqs. */ memflags = blk_mq_freeze_queue(q); blk_mq_quiesce_queue_nowait(q); blk_mq_unfreeze_queue(q, memflags); + virtblk_ctrl_vq_quiesce(vblk); + /* Ensure we don't receive any more interrupts */ virtio_reset_device(vdev); + virtblk_ctrl_vq_drain(vblk); /* Make sure no work handler is accessing the device. */ flush_work(&vblk->config_work); @@ -1612,6 +1843,7 @@ static int virtblk_freeze_priv(struct virtio_device *vdev) * pointers safely. */ vblk->vqs = NULL; + vblk->ctrl_vq.vq = NULL; return 0; } @@ -1672,6 +1904,7 @@ static unsigned int features[] = { VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES, VIRTIO_BLK_F_SECURE_ERASE, VIRTIO_BLK_F_ZONED, + VIRTIO_BLK_F_CTRL_VQ, }; static struct virtio_driver virtio_blk = { diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h index 3744e4da1b2a..0a16972a1535 100644 --- a/include/uapi/linux/virtio_blk.h +++ b/include/uapi/linux/virtio_blk.h @@ -42,6 +42,7 @@ #define VIRTIO_BLK_F_WRITE_ZEROES 14 /* WRITE ZEROES is supported */ #define VIRTIO_BLK_F_SECURE_ERASE 16 /* Secure Erase is supported */ #define VIRTIO_BLK_F_ZONED 17 /* Zoned block device */ +#define VIRTIO_BLK_F_CTRL_VQ 22 /* Control queue */ /* Legacy feature bits */ #ifndef VIRTIO_BLK_NO_LEGACY -- 2.34.1