hw/vhost.h

   1 #ifndef VHOST_H
   2 #define VHOST_H
   3
   4 #include "hw/hw.h"
   5 #include "hw/virtio.h"
   6 #include "exec/memory.h"
   7
   8 /* Generic structures common for any vhost based device. */
   9 struct vhost_virtqueue {
  10     int kick;
  11     int call;
  12     void *desc;
  13     void *avail;
  14     void *used;
  15     int num;
  16     unsigned long long used_phys;
  17     unsigned used_size;
  18     void *ring;
  19     unsigned long long ring_phys;
  20     unsigned ring_size;
  21 };
  22
  23 typedef unsigned long vhost_log_chunk_t;
  24 #define VHOST_LOG_PAGE 0x1000
  25 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  26 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  27
  28 struct vhost_memory;
  29 struct vhost_dev {
  30     MemoryListener memory_listener;
  31     int control;
  32     struct vhost_memory *mem;
  33     int n_mem_sections;
  34     MemoryRegionSection *mem_sections;
  35     struct vhost_virtqueue *vqs;
  36     int nvqs;
  37     unsigned long long features;
  38     unsigned long long acked_features;
  39     unsigned long long backend_features;
  40     bool started;
  41     bool log_enabled;
  42     vhost_log_chunk_t *log;
  43     unsigned long long log_size;
  44     bool force;
  45 };
  46
  47 int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
  48                    bool force);
  49 void vhost_dev_cleanup(struct vhost_dev *hdev);
  50 bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);
  51 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  52 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  53 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  54 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  55
  56 #endif