aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/virtio_blk.c20
-rw-r--r--drivers/char/virtio_console.c7
-rw-r--r--drivers/vdpa/mlx5/net/mlx5_vnet.c34
-rw-r--r--drivers/vdpa/vdpa.c2
-rw-r--r--drivers/vdpa/vdpa_user/iova_domain.c2
-rw-r--r--drivers/vdpa/virtio_pci/vp_vdpa.c2
-rw-r--r--drivers/vhost/iotlb.c11
-rw-r--r--drivers/vhost/vdpa.c2
-rw-r--r--drivers/vhost/vhost.c9
-rw-r--r--drivers/virtio/Kconfig1
-rw-r--r--drivers/virtio/virtio.c56
-rw-r--r--drivers/virtio/virtio_vdpa.c2
12 files changed, 109 insertions, 39 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index c443cd64fc9b..8c415be86732 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -76,9 +76,6 @@ struct virtio_blk {
*/
refcount_t refs;
- /* What host tells us, plus 2 for header & tailer. */
- unsigned int sg_elems;
-
/* Ida index - used to track minor number allocations. */
int index;
@@ -322,8 +319,6 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
blk_status_t status;
int err;
- BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
-
status = virtblk_setup_cmd(vblk->vdev, req, vbr);
if (unlikely(status))
return status;
@@ -783,8 +778,6 @@ static int virtblk_probe(struct virtio_device *vdev)
/* Prevent integer overflows and honor max vq size */
sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2);
- /* We need extra sg elements at head and tail. */
- sg_elems += 2;
vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
if (!vblk) {
err = -ENOMEM;
@@ -796,7 +789,6 @@ static int virtblk_probe(struct virtio_device *vdev)
mutex_init(&vblk->vdev_mutex);
vblk->vdev = vdev;
- vblk->sg_elems = sg_elems;
INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
@@ -853,7 +845,7 @@ static int virtblk_probe(struct virtio_device *vdev)
set_disk_ro(vblk->disk, 1);
/* We can handle whatever the host told us to handle. */
- blk_queue_max_segments(q, vblk->sg_elems-2);
+ blk_queue_max_segments(q, sg_elems);
/* No real sector limit. */
blk_queue_max_hw_sectors(q, -1U);
@@ -925,9 +917,15 @@ static int virtblk_probe(struct virtio_device *vdev)
virtio_cread(vdev, struct virtio_blk_config, max_discard_seg,
&v);
+
+ /*
+ * max_discard_seg == 0 is out of spec but we always
+ * handled it.
+ */
+ if (!v)
+ v = sg_elems;
blk_queue_max_discard_segments(q,
- min_not_zero(v,
- MAX_DISCARD_SEGMENTS));
+ min(v, MAX_DISCARD_SEGMENTS));
blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
}
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 2359889a35a0..e3c430539a17 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1957,6 +1957,13 @@ static void virtcons_remove(struct virtio_device *vdev)
list_del(&portdev->list);
spin_unlock_irq(&pdrvdata_lock);
+ /* Device is going away, exit any polling for buffers */
+ virtio_break_device(vdev);
+ if (use_multiport(portdev))
+ flush_work(&portdev->control_work);
+ else
+ flush_work(&portdev->config_work);
+
/* Disable interrupts for vqs */
virtio_reset_device(vdev);
/* Finish up work that's lined up */
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index f648f1c54a0f..d0f91078600e 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1563,11 +1563,27 @@ static virtio_net_ctrl_ack handle_ctrl_mq(struct mlx5_vdpa_dev *mvdev, u8 cmd)
switch (cmd) {
case VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET:
+ /* This mq feature check aligns with pre-existing userspace
+ * implementation.
+ *
+ * Without it, an untrusted driver could fake a multiqueue config
+ * request down to a non-mq device that may cause kernel to
+ * panic due to uninitialized resources for extra vqs. Even with
+ * a well behaving guest driver, it is not expected to allow
+ * changing the number of vqs on a non-mq device.
+ */
+ if (!MLX5_FEATURE(mvdev, VIRTIO_NET_F_MQ))
+ break;
+
read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, (void *)&mq, sizeof(mq));
if (read != sizeof(mq))
break;
newqps = mlx5vdpa16_to_cpu(mvdev, mq.virtqueue_pairs);
+ if (newqps < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
+ newqps > mlx5_vdpa_max_qps(mvdev->max_vqs))
+ break;
+
if (ndev->cur_num_vqs == 2 * newqps) {
status = VIRTIO_NET_OK;
break;
@@ -1897,11 +1913,25 @@ static u64 mlx5_vdpa_get_device_features(struct vdpa_device *vdev)
return ndev->mvdev.mlx_features;
}
-static int verify_min_features(struct mlx5_vdpa_dev *mvdev, u64 features)
+static int verify_driver_features(struct mlx5_vdpa_dev *mvdev, u64 features)
{
+ /* Minimum features to expect */
if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)))
return -EOPNOTSUPP;
+ /* Double check features combination sent down by the driver.
+ * Fail invalid features due to absence of the depended feature.
+ *
+ * Per VIRTIO v1.1 specification, section 5.1.3.1 Feature bit
+ * requirements: "VIRTIO_NET_F_MQ Requires VIRTIO_NET_F_CTRL_VQ".
+ * By failing the invalid features sent down by untrusted drivers,
+ * we're assured the assumption made upon is_index_valid() and
+ * is_ctrl_vq_idx() will not be compromised.
+ */
+ if ((features & (BIT_ULL(VIRTIO_NET_F_MQ) | BIT_ULL(VIRTIO_NET_F_CTRL_VQ))) ==
+ BIT_ULL(VIRTIO_NET_F_MQ))
+ return -EINVAL;
+
return 0;
}
@@ -1977,7 +2007,7 @@ static int mlx5_vdpa_set_driver_features(struct vdpa_device *vdev, u64 features)
print_features(mvdev, features, true);
- err = verify_min_features(mvdev, features);
+ err = verify_driver_features(mvdev, features);
if (err)
return err;
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 9846c9de4bfa..1ea525433a5c 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -393,7 +393,7 @@ static void vdpa_get_config_unlocked(struct vdpa_device *vdev,
* If it does happen we assume a legacy guest.
*/
if (!vdev->features_valid)
- vdpa_set_features(vdev, 0, true);
+ vdpa_set_features_unlocked(vdev, 0);
ops->get_config(vdev, offset, buf, len);
}
diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c
index 2b1143f11d8f..0a4d93edc4c0 100644
--- a/drivers/vdpa/vdpa_user/iova_domain.c
+++ b/drivers/vdpa/vdpa_user/iova_domain.c
@@ -294,7 +294,7 @@ vduse_domain_alloc_iova(struct iova_domain *iovad,
iova_pfn = alloc_iova_fast(iovad, iova_len, limit >> shift, true);
- return iova_pfn << shift;
+ return (dma_addr_t)iova_pfn << shift;
}
static void vduse_domain_free_iova(struct iova_domain *iovad,
diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c
index a57e381e830b..cce101e6a940 100644
--- a/drivers/vdpa/virtio_pci/vp_vdpa.c
+++ b/drivers/vdpa/virtio_pci/vp_vdpa.c
@@ -533,8 +533,8 @@ static void vp_vdpa_remove(struct pci_dev *pdev)
{
struct vp_vdpa *vp_vdpa = pci_get_drvdata(pdev);
- vdpa_unregister_device(&vp_vdpa->vdpa);
vp_modern_remove(&vp_vdpa->mdev);
+ vdpa_unregister_device(&vp_vdpa->vdpa);
}
static struct pci_driver vp_vdpa_driver = {
diff --git a/drivers/vhost/iotlb.c b/drivers/vhost/iotlb.c
index 670d56c879e5..40b098320b2a 100644
--- a/drivers/vhost/iotlb.c
+++ b/drivers/vhost/iotlb.c
@@ -57,6 +57,17 @@ int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb,
if (last < start)
return -EFAULT;
+ /* If the range being mapped is [0, ULONG_MAX], split it into two entries
+ * otherwise its size would overflow u64.
+ */
+ if (start == 0 && last == ULONG_MAX) {
+ u64 mid = last / 2;
+
+ vhost_iotlb_add_range_ctx(iotlb, start, mid, addr, perm, opaque);
+ addr += mid + 1;
+ start = mid + 1;
+ }
+
if (iotlb->limit &&
iotlb->nmaps == iotlb->limit &&
iotlb->flags & VHOST_IOTLB_FLAG_RETIRE) {
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 851539807bc9..ec5249e8c32d 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -286,7 +286,7 @@ static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep)
if (copy_from_user(&features, featurep, sizeof(features)))
return -EFAULT;
- if (vdpa_set_features(vdpa, features, false))
+ if (vdpa_set_features(vdpa, features))
return -EINVAL;
return 0;
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 59edb5a1ffe2..082380c03a3e 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1170,6 +1170,11 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev,
goto done;
}
+ if (msg.size == 0) {
+ ret = -EINVAL;
+ goto done;
+ }
+
if (dev->msg_handler)
ret = dev->msg_handler(dev, &msg);
else
@@ -1981,7 +1986,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq)
return 0;
}
-static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
+static int vhost_update_avail_event(struct vhost_virtqueue *vq)
{
if (vhost_put_avail_event(vq))
return -EFAULT;
@@ -2527,7 +2532,7 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
return false;
}
} else {
- r = vhost_update_avail_event(vq, vq->avail_idx);
+ r = vhost_update_avail_event(vq);
if (r) {
vq_err(vq, "Failed to update avail event index at %p: %d\n",
vhost_avail_event(vq), r);
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 34f80b7a8a64..492fc26f0b65 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -105,7 +105,6 @@ config VIRTIO_BALLOON
config VIRTIO_MEM
tristate "Virtio mem driver"
- default m
depends on X86_64
depends on VIRTIO
depends on MEMORY_HOTPLUG
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 00ac9db792a4..22f15f444f75 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -166,14 +166,13 @@ void virtio_add_status(struct virtio_device *dev, unsigned int status)
}
EXPORT_SYMBOL_GPL(virtio_add_status);
-int virtio_finalize_features(struct virtio_device *dev)
+/* Do some validation, then set FEATURES_OK */
+static int virtio_features_ok(struct virtio_device *dev)
{
- int ret = dev->config->finalize_features(dev);
unsigned status;
+ int ret;
might_sleep();
- if (ret)
- return ret;
ret = arch_has_restricted_virtio_memory_access();
if (ret) {
@@ -202,8 +201,23 @@ int virtio_finalize_features(struct virtio_device *dev)
}
return 0;
}
-EXPORT_SYMBOL_GPL(virtio_finalize_features);
+/**
+ * virtio_reset_device - quiesce device for removal
+ * @dev: the device to reset
+ *
+ * Prevents device from sending interrupts and accessing memory.
+ *
+ * Generally used for cleanup during driver / device removal.
+ *
+ * Once this has been invoked, caller must ensure that
+ * virtqueue_notify / virtqueue_kick are not in progress.
+ *
+ * Note: this guarantees that vq callbacks are not in progress, however caller
+ * is responsible for preventing access from other contexts, such as a system
+ * call/workqueue/bh. Invoking virtio_break_device then flushing any such
+ * contexts is one way to handle that.
+ * */
void virtio_reset_device(struct virtio_device *dev)
{
dev->config->reset(dev);
@@ -245,17 +259,6 @@ static int virtio_dev_probe(struct device *_d)
driver_features_legacy = driver_features;
}
- /*
- * Some devices detect legacy solely via F_VERSION_1. Write
- * F_VERSION_1 to force LE config space accesses before FEATURES_OK for
- * these when needed.
- */
- if (drv->validate && !virtio_legacy_is_little_endian()
- && device_features & BIT_ULL(VIRTIO_F_VERSION_1)) {
- dev->features = BIT_ULL(VIRTIO_F_VERSION_1);
- dev->config->finalize_features(dev);
- }
-
if (device_features & (1ULL << VIRTIO_F_VERSION_1))
dev->features = driver_features & device_features;
else
@@ -266,13 +269,26 @@ static int virtio_dev_probe(struct device *_d)
if (device_features & (1ULL << i))
__virtio_set_bit(dev, i);
+ err = dev->config->finalize_features(dev);
+ if (err)
+ goto err;
+
if (drv->validate) {
+ u64 features = dev->features;
+
err = drv->validate(dev);
if (err)
goto err;
+
+ /* Did validation change any features? Then write them again. */
+ if (features != dev->features) {
+ err = dev->config->finalize_features(dev);
+ if (err)
+ goto err;
+ }
}
- err = virtio_finalize_features(dev);
+ err = virtio_features_ok(dev);
if (err)
goto err;
@@ -496,7 +512,11 @@ int virtio_device_restore(struct virtio_device *dev)
/* We have a driver! */
virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER);
- ret = virtio_finalize_features(dev);
+ ret = dev->config->finalize_features(dev);
+ if (ret)
+ goto err;
+
+ ret = virtio_features_ok(dev);
if (ret)
goto err;
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 7767a7f0119b..76504559bc25 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -317,7 +317,7 @@ static int virtio_vdpa_finalize_features(struct virtio_device *vdev)
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
- return vdpa_set_features(vdpa, vdev->features, false);
+ return vdpa_set_features(vdpa, vdev->features);
}
static const char *virtio_vdpa_bus_name(struct virtio_device *vdev)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 08:05:50 +0000