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    SubjectRe: [PATCH v2 03/20] virtio: Add get_shm_region method
    On Fri, Aug 07, 2020 at 03:55:09PM -0400, Vivek Goyal wrote:
    > From: Sebastien Boeuf <sebastien.boeuf@intel.com>
    >
    > 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@intel.com>
    > Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
    > Cc: kvm@vger.kernel.org
    > Cc: "Michael S. Tsirkin" <mst@redhat.com>

    I'm not sure why doesn't b4 pick up reset of this
    patchset. where can I find it?


    IIUC all this is 5.10 material, right?


    > ---
    > 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 bb4cc4910750..c859f000a751 100644
    > --- a/include/linux/virtio_config.h
    > +++ b/include/linux/virtio_config.h
    > @@ -10,6 +10,11 @@
    >
    > 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
    > @@ -65,6 +70,7 @@ 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 {
    > @@ -88,6 +94,8 @@ 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. */
    > @@ -250,6 +258,15 @@ 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) ||
    > --
    > 2.25.4

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