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vdpa: add get_backend_features vdpa operation

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This operation allow vdpa parent to expose its own backend feature bits.

Next patches introduce a feature not compatible with all parent drivers:
the ability to enable vq after driver_ok.  Each parent must declare if
it allows it or not.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Message-Id: <20230609092127.170673-4-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2023-06-09 11:21:26 +02:00 committed by Michael S. Tsirkin
parent 9f09fd6171
commit b63e5c70c3
2 changed files with 16 additions and 0 deletions
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12
drivers/vhost/vdpa.c
View File

@ -403,6 +403,17 @@ static long vhost_vdpa_get_features(struct vhost_vdpa *v, u64 __user *featurep)
return 0;
}
static u64 vhost_vdpa_get_backend_features(const struct vhost_vdpa *v)
{
struct vdpa_device *vdpa = v->vdpa;
const struct vdpa_config_ops *ops = vdpa->config;
if (!ops->get_backend_features)
return 0;
else
return ops->get_backend_features(vdpa);
}
static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep)
{
struct vdpa_device *vdpa = v->vdpa;
@ -742,6 +753,7 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
features |= BIT_ULL(VHOST_BACKEND_F_SUSPEND);
if (vhost_vdpa_can_resume(v))
features |= BIT_ULL(VHOST_BACKEND_F_RESUME);
features |= vhost_vdpa_get_backend_features(v);
if (copy_to_user(featurep, &features, sizeof(features)))
r = -EFAULT;
break;

4
include/linux/vdpa.h
View File

@ -208,6 +208,9 @@ struct vdpa_map_file {
* @vdev: vdpa device
* Returns the virtio features support by the
* device
* @get_backend_features: Get parent-specific backend features (optional)
* Returns the vdpa features supported by the
* device.
* @set_driver_features: Set virtio features supported by the driver
* @vdev: vdpa device
* @features: feature support by the driver
@ -358,6 +361,7 @@ struct vdpa_config_ops {
u32 (*get_vq_align)(struct vdpa_device *vdev);
u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx);
u64 (*get_device_features)(struct vdpa_device *vdev);
u64 (*get_backend_features)(const struct vdpa_device *vdev);
int (*set_driver_features)(struct vdpa_device *vdev, u64 features);
u64 (*get_driver_features)(struct vdpa_device *vdev);
void (*set_config_cb)(struct vdpa_device *vdev,