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 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 > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
