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| author | Feng Liu <feliu@nvidia.com> | 2023-03-15 19:54:56 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-04-21 09:02:31 +0200 |
| commit | a084983dcd4e75616fe4102c690d2fc922ac32b5 (patch) | |
| tree | 0c0aa11f34f9a85384a6a623a2fe077d20b61d13 /drivers/virtio/virtio_pci_modern.c | |
| parent | vhost-scsi: Reduce vhost_scsi_mutex use (diff) | |
| download | linux-a084983dcd4e75616fe4102c690d2fc922ac32b5.tar.xz linux-a084983dcd4e75616fe4102c690d2fc922ac32b5.zip | |
virtio_ring: Allow non power of 2 sizes for packed virtqueue
According to the Virtio Specification, the Queue Size parameter of a
virtqueue corresponds to the maximum number of descriptors in that
queue, and it does not have to be a power of 2 for packed virtqueues.
However, the virtio_pci_modern driver enforced a power of 2 check for
virtqueue sizes, which is unnecessary and restrictive for packed
virtuqueue.
Split virtqueue still needs to check the virtqueue size is power_of_2
which has been done in vring_alloc_queue_split of the virtio_ring layer.
To validate this change, we tested various virtqueue sizes for packed
rings, including 128, 256, 512, 100, 200, 500, and 1000, with
CONFIG_PAGE_POISONING enabled, and all tests passed successfully.
Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Message-Id: <20230315185458.11638-2-feliu@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/virtio_pci_modern.c')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index 9e496e288cfa..6e713904d8e8 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -310,11 +310,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, if (!num || vp_modern_get_queue_enable(mdev, index)) return ERR_PTR(-ENOENT); - if (!is_power_of_2(num)) { - dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num); - return ERR_PTR(-EINVAL); - } - info->msix_vector = msix_vec; /* create the vring */ |