[PATCH RFC 3/5] vhost-vdpa: support get/set backend features
From: Jason Wang <jasowang@redhat.com>
Date: 2020-06-18 05:58:04
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Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
This patch makes userspace can get and set backend features to vhost-vdpa. Signed-off-by: Cindy Lu <redacted> Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vdpa.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index db4c9cb44c61..453057421f80 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c@@ -55,6 +55,10 @@ enum { (1ULL << VIRTIO_NET_F_SPEED_DUPLEX), }; +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
@@ -340,6 +344,8 @@ 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;
@@ -362,6 +368,18 @@ 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);
--
2.20.1