From 6318cb887548c70778d10c0fcb7134b4454ab8a6 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 24 Nov 2021 18:44:02 -0500 Subject: Revert "virtio-scsi: don't let virtio core to validate used buffer length" This reverts commit c57911ebfbfe745cb95da2bcf547c5bae000590f. Attempts to validate length in the core did not work out. We'll drop them for now, so revert the dependent changes in drivers. Signed-off-by: Michael S. Tsirkin --- drivers/scsi/virtio_scsi.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 19f7d7b90625..28e1d98ae102 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -977,7 +977,6 @@ static unsigned int features[] = { static struct virtio_driver virtio_scsi_driver = { .feature_table = features, .feature_table_size = ARRAY_SIZE(features), - .suppress_used_validation = true, .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .id_table = id_table, -- cgit v1.2.3-58-ga151 From 2b17d9f84884a37f1324be5526c6600e97a47fbe Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 24 Nov 2021 18:44:09 -0500 Subject: Revert "virtio-blk: don't let virtio core to validate used length" This reverts commit a40392edf1b2c7822bc0ce68413106661a9d4232. Attempts to validate length in the core did not work out. We'll drop them, so revert the dependent changes in drivers. Signed-off-by: Michael S. Tsirkin --- drivers/block/virtio_blk.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 97bf051a50ce..1a1b1189225d 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -1049,7 +1049,6 @@ static struct virtio_driver virtio_blk = { .feature_table_size = ARRAY_SIZE(features), .feature_table_legacy = features_legacy, .feature_table_size_legacy = ARRAY_SIZE(features_legacy), - .suppress_used_validation = true, .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .id_table = id_table, -- cgit v1.2.3-58-ga151 From fcfb65f8a922c7dd25a2e9913601dae979ce6560 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 24 Nov 2021 18:44:13 -0500 Subject: Revert "virtio-net: don't let virtio core to validate used length" This reverts commit 816625c13652cef5b2c49082d652875da6f2ad7a. Attempts to validate length in the core did not work out. We'll drop them, so revert the dependent changes in drivers. Signed-off-by: Michael S. Tsirkin --- drivers/net/virtio_net.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 1771d6e5224f..55db6a336f7e 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3423,7 +3423,6 @@ static struct virtio_driver virtio_net_driver = { .feature_table_size = ARRAY_SIZE(features), .feature_table_legacy = features_legacy, .feature_table_size_legacy = ARRAY_SIZE(features_legacy), - .suppress_used_validation = true, .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .id_table = id_table, -- cgit v1.2.3-58-ga151 From f124034faa911ed534bf8c4881ad98dbbde2a966 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 24 Nov 2021 18:44:17 -0500 Subject: Revert "virtio_ring: validate used buffer length" This reverts commit 939779f5152d161b34f612af29e7dc1ac4472fcf. Attempts to validate length in the core did not work out: there turn out to exist multiple broken devices, and in particular legacy devices are known to be broken in this respect. We have ideas for handling this better in the next version but for now let's revert to a known good state to make sure drivers work for people. Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_ring.c | 60 -------------------------------------------- include/linux/virtio.h | 2 -- 2 files changed, 62 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 00f64f2f8b72..6d2614e34470 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -14,9 +14,6 @@ #include #include -static bool force_used_validation = false; -module_param(force_used_validation, bool, 0444); - #ifdef DEBUG /* For development, we want to crash whenever the ring is screwed. */ #define BAD_RING(_vq, fmt, args...) \ @@ -185,9 +182,6 @@ struct vring_virtqueue { } packed; }; - /* Per-descriptor in buffer length */ - u32 *buflen; - /* How to notify other side. FIXME: commonalize hcalls! */ bool (*notify)(struct virtqueue *vq); @@ -496,7 +490,6 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, unsigned int i, n, avail, descs_used, prev, err_idx; int head; bool indirect; - u32 buflen = 0; START_USE(vq); @@ -578,7 +571,6 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, VRING_DESC_F_NEXT | VRING_DESC_F_WRITE, indirect); - buflen += sg->length; } } /* Last one doesn't continue. */ @@ -618,10 +610,6 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, else vq->split.desc_state[head].indir_desc = ctx; - /* Store in buffer length if necessary */ - if (vq->buflen) - vq->buflen[head] = buflen; - /* Put entry in available array (but don't update avail->idx until they * do sync). */ avail = vq->split.avail_idx_shadow & (vq->split.vring.num - 1); @@ -796,11 +784,6 @@ static void *virtqueue_get_buf_ctx_split(struct virtqueue *_vq, BAD_RING(vq, "id %u is not a head!\n", i); return NULL; } - if (vq->buflen && unlikely(*len > vq->buflen[i])) { - BAD_RING(vq, "used len %d is larger than in buflen %u\n", - *len, vq->buflen[i]); - return NULL; - } /* detach_buf_split clears data, so grab it now. */ ret = vq->split.desc_state[i].data; @@ -1079,7 +1062,6 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, unsigned int i, n, err_idx; u16 head, id; dma_addr_t addr; - u32 buflen = 0; head = vq->packed.next_avail_idx; desc = alloc_indirect_packed(total_sg, gfp); @@ -1109,8 +1091,6 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, desc[i].addr = cpu_to_le64(addr); desc[i].len = cpu_to_le32(sg->length); i++; - if (n >= out_sgs) - buflen += sg->length; } } @@ -1164,10 +1144,6 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, vq->packed.desc_state[id].indir_desc = desc; vq->packed.desc_state[id].last = id; - /* Store in buffer length if necessary */ - if (vq->buflen) - vq->buflen[id] = buflen; - vq->num_added += 1; pr_debug("Added buffer head %i to %p\n", head, vq); @@ -1203,7 +1179,6 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq, __le16 head_flags, flags; u16 head, id, prev, curr, avail_used_flags; int err; - u32 buflen = 0; START_USE(vq); @@ -1283,8 +1258,6 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq, 1 << VRING_PACKED_DESC_F_AVAIL | 1 << VRING_PACKED_DESC_F_USED; } - if (n >= out_sgs) - buflen += sg->length; } } @@ -1304,10 +1277,6 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq, vq->packed.desc_state[id].indir_desc = ctx; vq->packed.desc_state[id].last = prev; - /* Store in buffer length if necessary */ - if (vq->buflen) - vq->buflen[id] = buflen; - /* * A driver MUST NOT make the first descriptor in the list * available before all subsequent descriptors comprising @@ -1494,11 +1463,6 @@ static void *virtqueue_get_buf_ctx_packed(struct virtqueue *_vq, BAD_RING(vq, "id %u is not a head!\n", id); return NULL; } - if (vq->buflen && unlikely(*len > vq->buflen[id])) { - BAD_RING(vq, "used len %d is larger than in buflen %u\n", - *len, vq->buflen[id]); - return NULL; - } /* detach_buf_packed clears data, so grab it now. */ ret = vq->packed.desc_state[id].data; @@ -1704,7 +1668,6 @@ static struct virtqueue *vring_create_virtqueue_packed( struct vring_virtqueue *vq; struct vring_packed_desc *ring; struct vring_packed_desc_event *driver, *device; - struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver); dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr; size_t ring_size_in_bytes, event_size_in_bytes; @@ -1794,15 +1757,6 @@ static struct virtqueue *vring_create_virtqueue_packed( if (!vq->packed.desc_extra) goto err_desc_extra; - if (!drv->suppress_used_validation || force_used_validation) { - vq->buflen = kmalloc_array(num, sizeof(*vq->buflen), - GFP_KERNEL); - if (!vq->buflen) - goto err_buflen; - } else { - vq->buflen = NULL; - } - /* No callback? Tell other side not to bother us. */ if (!callback) { vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE; @@ -1815,8 +1769,6 @@ static struct virtqueue *vring_create_virtqueue_packed( spin_unlock(&vdev->vqs_list_lock); return &vq->vq; -err_buflen: - kfree(vq->packed.desc_extra); err_desc_extra: kfree(vq->packed.desc_state); err_desc_state: @@ -2224,7 +2176,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, void (*callback)(struct virtqueue *), const char *name) { - struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver); struct vring_virtqueue *vq; if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) @@ -2284,15 +2235,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, if (!vq->split.desc_extra) goto err_extra; - if (!drv->suppress_used_validation || force_used_validation) { - vq->buflen = kmalloc_array(vring.num, sizeof(*vq->buflen), - GFP_KERNEL); - if (!vq->buflen) - goto err_buflen; - } else { - vq->buflen = NULL; - } - /* Put everything in free lists. */ vq->free_head = 0; memset(vq->split.desc_state, 0, vring.num * @@ -2303,8 +2245,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, spin_unlock(&vdev->vqs_list_lock); return &vq->vq; -err_buflen: - kfree(vq->split.desc_extra); err_extra: kfree(vq->split.desc_state); err_state: diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 44d0e09da2d9..41edbc01ffa4 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -152,7 +152,6 @@ size_t virtio_max_dma_size(struct virtio_device *vdev); * @feature_table_size: number of entries in the feature table array. * @feature_table_legacy: same as feature_table but when working in legacy mode. * @feature_table_size_legacy: number of entries in feature table legacy array. - * @suppress_used_validation: set to not have core validate used length * @probe: the function to call when a device is found. Returns 0 or -errno. * @scan: optional function to call after successful probe; intended * for virtio-scsi to invoke a scan. @@ -169,7 +168,6 @@ struct virtio_driver { unsigned int feature_table_size; const unsigned int *feature_table_legacy; unsigned int feature_table_size_legacy; - bool suppress_used_validation; int (*validate)(struct virtio_device *dev); int (*probe)(struct virtio_device *dev); void (*scan)(struct virtio_device *dev); -- cgit v1.2.3-58-ga151 From 49d8c5ffad07ca014cfae72a1b9b8c52b6ad9cb8 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Mon, 22 Nov 2021 17:35:24 +0100 Subject: vhost/vsock: fix incorrect used length reported to the guest The "used length" reported by calling vhost_add_used() must be the number of bytes written by the device (using "in" buffers). In vhost_vsock_handle_tx_kick() the device only reads the guest buffers (they are all "out" buffers), without writing anything, so we must pass 0 as "used length" to comply virtio spec. Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko") Cc: stable@vger.kernel.org Reported-by: Halil Pasic Suggested-by: Jason Wang Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20211122163525.294024-2-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi Reviewed-by: Halil Pasic --- drivers/vhost/vsock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 938aefbc75ec..4e3b95af7ee4 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -554,7 +554,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) virtio_transport_free_pkt(pkt); len += sizeof(pkt->hdr); - vhost_add_used(vq, head, len); + vhost_add_used(vq, head, 0); total_len += len; added = true; } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); -- cgit v1.2.3-58-ga151 From 11708ff92c1dba9aaa59168c46c5317677595942 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Mon, 22 Nov 2021 17:35:25 +0100 Subject: vhost/vsock: cleanup removing `len` variable We can increment `total_len` directly and remove `len` since it is no longer used for vhost_add_used(). Signed-off-by: Stefano Garzarella Link: https://lore.kernel.org/r/20211122163525.294024-3-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi --- drivers/vhost/vsock.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 4e3b95af7ee4..d6ca1c7ad513 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -511,8 +511,6 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) vhost_disable_notify(&vsock->dev, vq); do { - u32 len; - if (!vhost_vsock_more_replies(vsock)) { /* Stop tx until the device processes already * pending replies. Leave tx virtqueue @@ -540,7 +538,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) continue; } - len = pkt->len; + total_len += sizeof(pkt->hdr) + pkt->len; /* Deliver to monitoring devices all received packets */ virtio_transport_deliver_tap_pkt(pkt); @@ -553,9 +551,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) else virtio_transport_free_pkt(pkt); - len += sizeof(pkt->hdr); vhost_add_used(vq, head, 0); - total_len += len; added = true; } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); -- cgit v1.2.3-58-ga151 From 0466a39bd0b6c462338f10d18076703d14a552de Mon Sep 17 00:00:00 2001 From: Ye Guojin Date: Wed, 17 Nov 2021 06:39:55 +0000 Subject: virtio-blk: modify the value type of num in virtio_queue_rq() This was found by coccicheck: ./drivers/block/virtio_blk.c, 334, 14-17, WARNING Unsigned expression compared with zero num < 0 Reported-by: Zeal Robot Signed-off-by: Ye Guojin Link: https://lore.kernel.org/r/20211117063955.160777-1-ye.guojin@zte.com.cn Signed-off-by: Michael S. Tsirkin Fixes: 02746e26c39e ("virtio-blk: avoid preallocating big SGL for data") Reviewed-by: Stefano Garzarella Reviewed-by: Max Gurtovoy Reviewed-by: Stefan Hajnoczi --- drivers/block/virtio_blk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 1a1b1189225d..6ae38776e30e 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -316,7 +316,7 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req = bd->rq; struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); unsigned long flags; - unsigned int num; + int num; int qid = hctx->queue_num; bool notify = false; blk_status_t status; -- cgit v1.2.3-58-ga151 From ea8f17e44fa7d54fae287ccbe30ce269afb5ee42 Mon Sep 17 00:00:00 2001 From: Wu Zongyong Date: Mon, 15 Nov 2021 11:16:42 +0800 Subject: vhost-vdpa: clean irqs before reseting vdpa device Vdpa devices should be reset after unseting irqs of virtqueues, or we will get errors when killing qemu process: >> pi_update_irte: failed to update PI IRTE >> irq bypass consumer (token 0000000065102a43) unregistration fails: -22 Signed-off-by: Wu Zongyong Link: https://lore.kernel.org/r/a2cb60cf73be9da5c4e6399242117d8818f975ae.1636946171.git.wuzongyong@linux.alibaba.com Signed-off-by: Michael S. Tsirkin Acked-by: Jason Wang --- drivers/vhost/vdpa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 01c59ce7e250..29cced1cd277 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -1014,12 +1014,12 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) mutex_lock(&d->mutex); filep->private_data = NULL; + vhost_vdpa_clean_irq(v); vhost_vdpa_reset(v); vhost_dev_stop(&v->vdev); vhost_vdpa_iotlb_free(v); vhost_vdpa_free_domain(v); vhost_vdpa_config_put(v); - vhost_vdpa_clean_irq(v); vhost_dev_cleanup(&v->vdev); kfree(v->vdev.vqs); mutex_unlock(&d->mutex); -- cgit v1.2.3-58-ga151 From bb93ce4b150dde79f58e34103cbd1fe829796649 Mon Sep 17 00:00:00 2001 From: Longpeng Date: Wed, 24 Nov 2021 09:52:15 +0800 Subject: vdpa_sim: avoid putting an uninitialized iova_domain The system will crash if we put an uninitialized iova_domain, this could happen when an error occurs before initializing the iova_domain in vdpasim_create(). BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0 ... Call Trace: put_iova_domain+0x29/0x220 vdpasim_free+0xd1/0x120 [vdpa_sim] vdpa_release_dev+0x21/0x40 [vdpa] device_release+0x33/0x90 kobject_release+0x63/0x160 vdpasim_create+0x127/0x2a0 [vdpa_sim] vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net] vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa] genl_family_rcv_msg_doit+0x112/0x140 genl_rcv_msg+0xdf/0x1d0 ... So we must make sure the iova_domain is already initialized before put it. In addition, we may get the following warning in this case: WARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70 So we must make sure the iova_cache_put() is invoked only if the iova_cache_get() is already invoked. Let's fix it together. Cc: stable@vger.kernel.org Fixes: 4080fc106750 ("vdpa_sim: use iova module to allocate IOVA addresses") Signed-off-by: Longpeng Acked-by: Jason Wang Reviewed-by: Stefano Garzarella Link: https://lore.kernel.org/r/20211124015215.119-1-longpeng2@huawei.com Signed-off-by: Michael S. Tsirkin --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index 5f484fff8dbe..41b0cd17fcba 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -591,8 +591,11 @@ static void vdpasim_free(struct vdpa_device *vdpa) vringh_kiov_cleanup(&vdpasim->vqs[i].in_iov); } - put_iova_domain(&vdpasim->iova); - iova_cache_put(); + if (vdpa_get_dma_dev(vdpa)) { + put_iova_domain(&vdpasim->iova); + iova_cache_put(); + } + kvfree(vdpasim->buffer); if (vdpasim->iommu) vhost_iotlb_free(vdpasim->iommu); -- cgit v1.2.3-58-ga151