include/hw/virtio/vhost-backend.h

   1 /*
   2  * vhost-backend
   3  *
   4  * Copyright (c) 2013 Virtual Open Systems Sarl.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #ifndef VHOST_BACKEND_H_
  12 #define VHOST_BACKEND_H_
  13
  14 typedef enum VhostBackendType {
  15     VHOST_BACKEND_TYPE_NONE = 0,
  16     VHOST_BACKEND_TYPE_KERNEL = 1,
  17     VHOST_BACKEND_TYPE_USER = 2,
  18     VHOST_BACKEND_TYPE_MAX = 3,
  19 } VhostBackendType;
  20
  21 struct vhost_dev;
  22
  23 typedef int (*vhost_call)(struct vhost_dev *dev, unsigned long int request,
  24              void *arg);
  25 typedef int (*vhost_backend_init)(struct vhost_dev *dev, void *opaque);
  26 typedef int (*vhost_backend_cleanup)(struct vhost_dev *dev);
  27 typedef int (*vhost_backend_get_vq_index)(struct vhost_dev *dev, int idx);
  28 typedef int (*vhost_backend_set_vring_enable)(struct vhost_dev *dev, int enable);
  29 typedef int (*vhost_backend_memslots_limit)(struct vhost_dev *dev);
  30
  31 typedef int (*vhost_set_log_base_op)(struct vhost_dev *dev, uint64_t base);
  32
  33 typedef struct VhostOps {
  34     VhostBackendType backend_type;
  35     vhost_call vhost_call;
  36     vhost_backend_init vhost_backend_init;
  37     vhost_backend_cleanup vhost_backend_cleanup;
  38     vhost_backend_get_vq_index vhost_backend_get_vq_index;
  39     vhost_backend_set_vring_enable vhost_backend_set_vring_enable;
  40     vhost_backend_memslots_limit vhost_backend_memslots_limit;
  41     vhost_set_log_base_op vhost_set_log_base;
  42 } VhostOps;
  43
  44 extern const VhostOps user_ops;
  45
  46 int vhost_set_backend_type(struct vhost_dev *dev,
  47                            VhostBackendType backend_type);
  48
  49 #endif /* VHOST_BACKEND_H_ */