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

Pull virtio updates from Michael Tsirkin:
 "vhost,virtio,vdpa: features, fixes, cleanups.

  vdpa/mlx5:
   - VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK
   - new maintainer

  vdpa:
   - support for vq descriptor mappings
   - decouple reset of iotlb mapping from device reset

  and fixes, cleanups all over the place"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (34 commits)
  vdpa_sim: implement .reset_map support
  vdpa/mlx5: implement .reset_map driver op
  vhost-vdpa: clean iotlb map during reset for older userspace
  vdpa: introduce .compat_reset operation callback
  vhost-vdpa: introduce IOTLB_PERSIST backend feature bit
  vhost-vdpa: reset vendor specific mapping to initial state in .release
  vdpa: introduce .reset_map operation callback
  virtio_pci: add check for common cfg size
  virtio-blk: fix implicit overflow on virtio_max_dma_size
  virtio_pci: add build offset check for the new common cfg items
  virtio: add definition of VIRTIO_F_NOTIF_CONFIG_DATA feature bit
  vduse: make vduse_class constant
  vhost-scsi: Spelling s/preceeding/preceding/g
  virtio: kdoc for struct virtio_pci_modern_device
  vdpa: Update sysfs ABI documentation
  MAINTAINERS: Add myself as mlx5_vdpa driver
  virtio-balloon: correct the comment of virtballoon_migratepage()
  mlx5_vdpa: offer VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK
  vdpa/mlx5: Update cvq iotlb mapping on ASID change
  vdpa/mlx5: Make iotlb helper functions more generic
  ...

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index d6bb68ba84e5..ee6a386d250b 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -39,6 +39,39 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features)
 		__virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
 }
 
+static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit,
+					    u32 offset, const char *fname)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+	if (!__virtio_test_bit(vdev, fbit))
+		return 0;
+
+	if (likely(vp_dev->mdev.common_len >= offset))
+		return 0;
+
+	dev_err(&vdev->dev,
+		"virtio: common cfg size(%zu) does not match the feature %s\n",
+		vp_dev->mdev.common_len, fname);
+
+	return -EINVAL;
+}
+
+#define vp_check_common_size_one_feature(vdev, fbit, field) \
+	__vp_check_common_size_one_feature(vdev, fbit, \
+		offsetofend(struct virtio_pci_modern_common_cfg, field), #fbit)
+
+static int vp_check_common_size(struct virtio_device *vdev)
+{
+	if (vp_check_common_size_one_feature(vdev, VIRTIO_F_NOTIF_CONFIG_DATA, queue_notify_data))
+		return -EINVAL;
+
+	if (vp_check_common_size_one_feature(vdev, VIRTIO_F_RING_RESET, queue_reset))
+		return -EINVAL;
+
+	return 0;
+}
+
 /* virtio config->finalize_features() implementation */
 static int vp_finalize_features(struct virtio_device *vdev)
 {
@@ -57,6 +90,9 @@ static int vp_finalize_features(struct virtio_device *vdev)
 		return -EINVAL;
 	}
 
+	if (vp_check_common_size(vdev))
+		return -EINVAL;
+
 	vp_modern_set_features(&vp_dev->mdev, vdev->features);
 
 	return 0;