vhost-vdpa: support get/set backend features (653055b9) · Commits · 戴 / test

drivers/vhost/vdpa.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -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);