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| author | Jason Wang <jasowang@redhat.com> | 2020-08-04 19:20:39 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-08-06 01:39:18 +0300 |
| commit | 653055b9acd45d602435f2f70b7a85cb3130f018 (patch) | |
| tree | 7fc18660f57c19601c27528b9b69b4489c18e6b6 /drivers | |
| parent | 460f7ce19f50e612a80b8cd0d2e38f2e14e765f6 (diff) | |
| download | linux-653055b9acd45d602435f2f70b7a85cb3130f018.tar.xz | |
vhost-vdpa: support get/set backend features
This patch makes userspace can get and set backend features to
vhost-vdpa.
Signed-off-by: Cindy Lu <lulu@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200804162048.22587-4-eli@mellanox.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/vhost/vdpa.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 01475bec6e0d..61c17d34cb39 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -26,6 +26,10 @@ #include "vhost.h" +enum { + VHOST_VDPA_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) +}; + /* Currently, only network backend w/o multiqueue is supported. */ #define VHOST_VDPA_VQ_MAX 2 @@ -347,6 +351,8 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, struct vdpa_callback cb; struct vhost_virtqueue *vq; struct vhost_vring_state s; + u64 __user *featurep = argp; + u64 features; u32 idx; long r; @@ -369,6 +375,18 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, case VHOST_GET_VRING_BASE: vq->last_avail_idx = ops->get_vq_state(v->vdpa, idx); break; + case VHOST_GET_BACKEND_FEATURES: + features = VHOST_VDPA_BACKEND_FEATURES; + if (copy_to_user(featurep, &features, sizeof(features))) + return -EFAULT; + return 0; + case VHOST_SET_BACKEND_FEATURES: + if (copy_from_user(&features, featurep, sizeof(features))) + return -EFAULT; + if (features & ~VHOST_VDPA_BACKEND_FEATURES) + return -EOPNOTSUPP; + vhost_set_backend_features(&v->vdev, features); + return 0; } r = vhost_vring_ioctl(&v->vdev, cmd, argp); |