On Wed, Sep 2, 2020 at 3:15 PM Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:
Hi Gurchetan,
Now Miklos has queued, these tree virtio patches for shared memory
region in his tree as part of virtiofs dax patch series.
I am hoping this will get merged in 5.10 through his tree.
https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git/log/?h=dax
Terrific ... ! Maybe we can queue the version Miklos has in drm-misc-next to avoid merge conflicts ?!?
There's a few checkpatch --strict fixes in the blob version, but I doubt anyone cares.
Thanks
Vivek
On Wed, Sep 02, 2020 at 02:08:28PM -0700, Gurchetan Singh wrote:
> From: Sebastien Boeuf <sebastien.boeuf@xxxxxxxxx>
>
> Virtio defines 'shared memory regions' that provide a continuously
> shared region between the host and guest.
>
> Provide a method to find a particular region on a device.
>
> Signed-off-by: Sebastien Boeuf <sebastien.boeuf@xxxxxxxxx>
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
> Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Cc: kvm@xxxxxxxxxxxxxxx
> Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> ---
> include/linux/virtio_config.h | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index 8fe857e27ef32..4b8e38c5c4d8c 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -11,6 +11,11 @@
>
> struct irq_affinity;
>
> +struct virtio_shm_region {
> + u64 addr;
> + u64 len;
> +};
> +
> /**
> * virtio_config_ops - operations for configuring a virtio device
> * Note: Do not assume that a transport implements all of the operations
> @@ -66,6 +71,7 @@ struct irq_affinity;
> * the caller can then copy.
> * @set_vq_affinity: set the affinity for a virtqueue (optional).
> * @get_vq_affinity: get the affinity for a virtqueue (optional).
> + * @get_shm_region: get a shared memory region based on the index.
> */
> typedef void vq_callback_t(struct virtqueue *);
> struct virtio_config_ops {
> @@ -89,6 +95,8 @@ struct virtio_config_ops {
> const struct cpumask *cpu_mask);
> const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
> int index);
> + bool (*get_shm_region)(struct virtio_device *vdev,
> + struct virtio_shm_region *region, u8 id);
> };
>
> /* If driver didn't advertise the feature, it will never appear. */
> @@ -251,6 +259,15 @@ int virtqueue_set_affinity(struct virtqueue *vq, const struct cpumask *cpu_mask)
> return 0;
> }
>
> +static inline
> +bool virtio_get_shm_region(struct virtio_device *vdev,
> + struct virtio_shm_region *region, u8 id)
> +{
> + if (!vdev->config->get_shm_region)
> + return false;
> + return vdev->config->get_shm_region(vdev, region, id);
> +}
> +
> static inline bool virtio_is_little_endian(struct virtio_device *vdev)
> {
> return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
> --
> 2.26.2
>
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