virtio: Add get_shm_region method
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> Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: kvm@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Cc: "Michael S. Tsirkin" <mst@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Родитель
9123e3a74e
Коммит
5bfe37ca8a
|
@ -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) ||
|
||||
|
|
Загрузка…
Ссылка в новой задаче