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commit bb617b9b4519b0cef939c9c8e9c41470749f0d51
parent 1be969f4682b0aa1995e46fba51502de55f15ce8
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 21 Jan 2019 07:37:16 +1300

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio/vhost fixes and cleanups from Michael Tsirkin:
 "Fixes and cleanups all over the place"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost/scsi: Use copy_to_iter() to send control queue response
  vhost: return EINVAL if iovecs size does not match the message size
  virtio-balloon: tweak config_changed implementation
  virtio: don't allocate vqs when names[i] = NULL
  virtio_pci: use queue idx instead of array idx to set up the vq
  virtio: document virtio_config_ops restrictions
  virtio: fix virtio_config_ops description

Diffstat:
Mdrivers/misc/mic/vop/vop_main.c | 9+++++++--
Mdrivers/remoteproc/remoteproc_virtio.c | 9+++++++--
Mdrivers/s390/virtio/virtio_ccw.c | 12+++++++++---
Mdrivers/vhost/scsi.c | 20++++++++++++--------
Mdrivers/vhost/vhost.c | 8++++++--
Mdrivers/virtio/virtio_balloon.c | 98++++++++++++++++++++++++++++++++++++++++++++++++++++---------------------------
Mdrivers/virtio/virtio_mmio.c | 9+++++++--
Mdrivers/virtio/virtio_pci_common.c | 8++++----
Minclude/linux/virtio_config.h | 13+++++++++----
9 files changed, 126 insertions(+), 60 deletions(-)

diff --git a/drivers/misc/mic/vop/vop_main.c b/drivers/misc/mic/vop/vop_main.c @@ -394,16 +394,21 @@ static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs, struct _vop_vdev *vdev = to_vopvdev(dev); struct vop_device *vpdev = vdev->vpdev; struct mic_device_ctrl __iomem *dc = vdev->dc; - int i, err, retry; + int i, err, retry, queue_idx = 0; /* We must have this many virtqueues. */ if (nvqs > ioread8(&vdev->desc->num_vq)) return -ENOENT; for (i = 0; i < nvqs; ++i) { + if (!names[i]) { + vqs[i] = NULL; + continue; + } + dev_dbg(_vop_dev(vdev), "%s: %d: %s\n", __func__, i, names[i]); - vqs[i] = vop_find_vq(dev, i, callbacks[i], names[i], + vqs[i] = vop_find_vq(dev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false); if (IS_ERR(vqs[i])) { err = PTR_ERR(vqs[i]); diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c @@ -153,10 +153,15 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs, const bool * ctx, struct irq_affinity *desc) { - int i, ret; + int i, ret, queue_idx = 0; for (i = 0; i < nvqs; ++i) { - vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i], + if (!names[i]) { + vqs[i] = NULL; + continue; + } + + vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false); if (IS_ERR(vqs[i])) { ret = PTR_ERR(vqs[i]); diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c @@ -635,7 +635,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, { struct virtio_ccw_device *vcdev = to_vc_device(vdev); unsigned long *indicatorp = NULL; - int ret, i; + int ret, i, queue_idx = 0; struct ccw1 *ccw; ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); @@ -643,8 +643,14 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, return -ENOMEM; for (i = 0; i < nvqs; ++i) { - vqs[i] = virtio_ccw_setup_vq(vdev, i, callbacks[i], names[i], - ctx ? ctx[i] : false, ccw); + if (!names[i]) { + vqs[i] = NULL; + continue; + } + + vqs[i] = virtio_ccw_setup_vq(vdev, queue_idx++, callbacks[i], + names[i], ctx ? ctx[i] : false, + ccw); if (IS_ERR(vqs[i])) { ret = PTR_ERR(vqs[i]); vqs[i] = NULL; diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c @@ -1127,16 +1127,18 @@ vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) { - struct virtio_scsi_ctrl_tmf_resp __user *resp; struct virtio_scsi_ctrl_tmf_resp rsp; + struct iov_iter iov_iter; int ret; pr_debug("%s\n", __func__); memset(&rsp, 0, sizeof(rsp)); rsp.response = VIRTIO_SCSI_S_FUNCTION_REJECTED; - resp = vq->iov[vc->out].iov_base; - ret = __copy_to_user(resp, &rsp, sizeof(rsp)); - if (!ret) + + iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); + + ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); + if (likely(ret == sizeof(rsp))) vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); else pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); @@ -1147,16 +1149,18 @@ vhost_scsi_send_an_resp(struct vhost_scsi *vs, struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) { - struct virtio_scsi_ctrl_an_resp __user *resp; struct virtio_scsi_ctrl_an_resp rsp; + struct iov_iter iov_iter; int ret; pr_debug("%s\n", __func__); memset(&rsp, 0, sizeof(rsp)); /* event_actual = 0 */ rsp.response = VIRTIO_SCSI_S_OK; - resp = vq->iov[vc->out].iov_base; - ret = __copy_to_user(resp, &rsp, sizeof(rsp)); - if (!ret) + + iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); + + ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); + if (likely(ret == sizeof(rsp))) vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); else pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c @@ -1034,8 +1034,10 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev, int type, ret; ret = copy_from_iter(&type, sizeof(type), from); - if (ret != sizeof(type)) + if (ret != sizeof(type)) { + ret = -EINVAL; goto done; + } switch (type) { case VHOST_IOTLB_MSG: @@ -1054,8 +1056,10 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev, iov_iter_advance(from, offset); ret = copy_from_iter(&msg, sizeof(msg), from); - if (ret != sizeof(msg)) + if (ret != sizeof(msg)) { + ret = -EINVAL; goto done; + } if (vhost_process_iotlb_msg(dev, &msg)) { ret = -EFAULT; goto done; diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c @@ -61,6 +61,10 @@ enum virtio_balloon_vq { VIRTIO_BALLOON_VQ_MAX }; +enum virtio_balloon_config_read { + VIRTIO_BALLOON_CONFIG_READ_CMD_ID = 0, +}; + struct virtio_balloon { struct virtio_device *vdev; struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; @@ -77,14 +81,20 @@ struct virtio_balloon { /* Prevent updating balloon when it is being canceled. */ spinlock_t stop_update_lock; bool stop_update; + /* Bitmap to indicate if reading the related config fields are needed */ + unsigned long config_read_bitmap; /* The list of allocated free pages, waiting to be given back to mm */ struct list_head free_page_list; spinlock_t free_page_list_lock; /* The number of free page blocks on the above list */ unsigned long num_free_page_blocks; - /* The cmd id received from host */ - u32 cmd_id_received; + /* + * The cmd id received from host. + * Read it via virtio_balloon_cmd_id_received to get the latest value + * sent from host. + */ + u32 cmd_id_received_cache; /* The cmd id that is actively in use */ __virtio32 cmd_id_active; /* Buffer to store the stop sign */ @@ -390,37 +400,31 @@ static unsigned long return_free_pages_to_mm(struct virtio_balloon *vb, return num_returned; } +static void virtio_balloon_queue_free_page_work(struct virtio_balloon *vb) +{ + if (!virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) + return; + + /* No need to queue the work if the bit was already set. */ + if (test_and_set_bit(VIRTIO_BALLOON_CONFIG_READ_CMD_ID, + &vb->config_read_bitmap)) + return; + + queue_work(vb->balloon_wq, &vb->report_free_page_work); +} + static void virtballoon_changed(struct virtio_device *vdev) { struct virtio_balloon *vb = vdev->priv; unsigned long flags; - s64 diff = towards_target(vb); - - if (diff) { - spin_lock_irqsave(&vb->stop_update_lock, flags); - if (!vb->stop_update) - queue_work(system_freezable_wq, - &vb->update_balloon_size_work); - spin_unlock_irqrestore(&vb->stop_update_lock, flags); - } - if (virtio_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { - virtio_cread(vdev, struct virtio_balloon_config, - free_page_report_cmd_id, &vb->cmd_id_received); - if (vb->cmd_id_received == VIRTIO_BALLOON_CMD_ID_DONE) { - /* Pass ULONG_MAX to give back all the free pages */ - return_free_pages_to_mm(vb, ULONG_MAX); - } else if (vb->cmd_id_received != VIRTIO_BALLOON_CMD_ID_STOP && - vb->cmd_id_received != - virtio32_to_cpu(vdev, vb->cmd_id_active)) { - spin_lock_irqsave(&vb->stop_update_lock, flags); - if (!vb->stop_update) { - queue_work(vb->balloon_wq, - &vb->report_free_page_work); - } - spin_unlock_irqrestore(&vb->stop_update_lock, flags); - } + spin_lock_irqsave(&vb->stop_update_lock, flags); + if (!vb->stop_update) { + queue_work(system_freezable_wq, + &vb->update_balloon_size_work); + virtio_balloon_queue_free_page_work(vb); } + spin_unlock_irqrestore(&vb->stop_update_lock, flags); } static void update_balloon_size(struct virtio_balloon *vb) @@ -527,6 +531,17 @@ static int init_vqs(struct virtio_balloon *vb) return 0; } +static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb) +{ + if (test_and_clear_bit(VIRTIO_BALLOON_CONFIG_READ_CMD_ID, + &vb->config_read_bitmap)) + virtio_cread(vb->vdev, struct virtio_balloon_config, + free_page_report_cmd_id, + &vb->cmd_id_received_cache); + + return vb->cmd_id_received_cache; +} + static int send_cmd_id_start(struct virtio_balloon *vb) { struct scatterlist sg; @@ -537,7 +552,8 @@ static int send_cmd_id_start(struct virtio_balloon *vb) while (virtqueue_get_buf(vq, &unused)) ; - vb->cmd_id_active = cpu_to_virtio32(vb->vdev, vb->cmd_id_received); + vb->cmd_id_active = virtio32_to_cpu(vb->vdev, + virtio_balloon_cmd_id_received(vb)); sg_init_one(&sg, &vb->cmd_id_active, sizeof(vb->cmd_id_active)); err = virtqueue_add_outbuf(vq, &sg, 1, &vb->cmd_id_active, GFP_KERNEL); if (!err) @@ -620,7 +636,8 @@ static int send_free_pages(struct virtio_balloon *vb) * stop the reporting. */ cmd_id_active = virtio32_to_cpu(vb->vdev, vb->cmd_id_active); - if (cmd_id_active != vb->cmd_id_received) + if (unlikely(cmd_id_active != + virtio_balloon_cmd_id_received(vb))) break; /* @@ -637,11 +654,9 @@ static int send_free_pages(struct virtio_balloon *vb) return 0; } -static void report_free_page_func(struct work_struct *work) +static void virtio_balloon_report_free_page(struct virtio_balloon *vb) { int err; - struct virtio_balloon *vb = container_of(work, struct virtio_balloon, - report_free_page_work); struct device *dev = &vb->vdev->dev; /* Start by sending the received cmd id to host with an outbuf. */ @@ -659,6 +674,23 @@ static void report_free_page_func(struct work_struct *work) dev_err(dev, "Failed to send a stop id, err = %d\n", err); } +static void report_free_page_func(struct work_struct *work) +{ + struct virtio_balloon *vb = container_of(work, struct virtio_balloon, + report_free_page_work); + u32 cmd_id_received; + + cmd_id_received = virtio_balloon_cmd_id_received(vb); + if (cmd_id_received == VIRTIO_BALLOON_CMD_ID_DONE) { + /* Pass ULONG_MAX to give back all the free pages */ + return_free_pages_to_mm(vb, ULONG_MAX); + } else if (cmd_id_received != VIRTIO_BALLOON_CMD_ID_STOP && + cmd_id_received != + virtio32_to_cpu(vb->vdev, vb->cmd_id_active)) { + virtio_balloon_report_free_page(vb); + } +} + #ifdef CONFIG_BALLOON_COMPACTION /* * virtballoon_migratepage - perform the balloon page migration on behalf of @@ -885,7 +917,7 @@ static int virtballoon_probe(struct virtio_device *vdev) goto out_del_vqs; } INIT_WORK(&vb->report_free_page_work, report_free_page_func); - vb->cmd_id_received = VIRTIO_BALLOON_CMD_ID_STOP; + vb->cmd_id_received_cache = VIRTIO_BALLOON_CMD_ID_STOP; vb->cmd_id_active = cpu_to_virtio32(vb->vdev, VIRTIO_BALLOON_CMD_ID_STOP); vb->cmd_id_stop = cpu_to_virtio32(vb->vdev, diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c @@ -468,7 +468,7 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, { struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); unsigned int irq = platform_get_irq(vm_dev->pdev, 0); - int i, err; + int i, err, queue_idx = 0; err = request_irq(irq, vm_interrupt, IRQF_SHARED, dev_name(&vdev->dev), vm_dev); @@ -476,7 +476,12 @@ static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs, return err; for (i = 0; i < nvqs; ++i) { - vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i], + if (!names[i]) { + vqs[i] = NULL; + continue; + } + + vqs[i] = vm_setup_vq(vdev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false); if (IS_ERR(vqs[i])) { vm_del_vqs(vdev); diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c @@ -285,7 +285,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, { struct virtio_pci_device *vp_dev = to_vp_device(vdev); u16 msix_vec; - int i, err, nvectors, allocated_vectors; + int i, err, nvectors, allocated_vectors, queue_idx = 0; vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); if (!vp_dev->vqs) @@ -321,7 +321,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs, msix_vec = allocated_vectors++; else msix_vec = VP_MSIX_VQ_VECTOR; - vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], + vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false, msix_vec); if (IS_ERR(vqs[i])) { @@ -356,7 +356,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs, const char * const names[], const bool *ctx) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); - int i, err; + int i, err, queue_idx = 0; vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL); if (!vp_dev->vqs) @@ -374,7 +374,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs, vqs[i] = NULL; continue; } - vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], + vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i], ctx ? ctx[i] : false, VIRTIO_MSI_NO_VECTOR); if (IS_ERR(vqs[i])) { diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h @@ -12,6 +12,11 @@ struct irq_affinity; /** * virtio_config_ops - operations for configuring a virtio device + * Note: Do not assume that a transport implements all of the operations + * getting/setting a value as a simple read/write! Generally speaking, + * any of @get/@set, @get_status/@set_status, or @get_features/ + * @finalize_features are NOT safe to be called from an atomic + * context. * @get: read the value of a configuration field * vdev: the virtio_device * offset: the offset of the configuration field @@ -22,7 +27,7 @@ struct irq_affinity; * offset: the offset of the configuration field * buf: the buffer to read the field value from. * len: the length of the buffer - * @generation: config generation counter + * @generation: config generation counter (optional) * vdev: the virtio_device * Returns the config generation counter * @get_status: read the status byte @@ -48,17 +53,17 @@ struct irq_affinity; * @del_vqs: free virtqueues found by find_vqs(). * @get_features: get the array of feature bits for this device. * vdev: the virtio_device - * Returns the first 32 feature bits (all we currently need). + * Returns the first 64 feature bits (all we currently need). * @finalize_features: confirm what device features we'll be using. * vdev: the virtio_device * This gives the final feature bits for the device: it can change * the dev->feature bits if it wants. * Returns 0 on success or error status - * @bus_name: return the bus name associated with the device + * @bus_name: return the bus name associated with the device (optional) * vdev: the virtio_device * This returns a pointer to the bus name a la pci_name from which * the caller can then copy. - * @set_vq_affinity: set the affinity for a virtqueue. + * @set_vq_affinity: set the affinity for a virtqueue (optional). * @get_vq_affinity: get the affinity for a virtqueue (optional). */ typedef void vq_callback_t(struct virtqueue *);