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     EventNotifier masked_notifier;
  22 };
  23
  24 typedef unsigned long vhost_log_chunk_t;
  25 #define VHOST_LOG_PAGE 0x1000
  26 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  27 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  28
  29 struct vhost_memory;
  30 struct vhost_dev {
  31     MemoryListener memory_listener;
  32     int control;
  33     struct vhost_memory *mem;
  34     int n_mem_sections;
  35     MemoryRegionSection *mem_sections;
  36     struct vhost_virtqueue *vqs;
  37     int nvqs;
  38     /* the first virtuque which would be used by this vhost dev */
  39     int vq_index;
  40     unsigned long long features;
  41     unsigned long long acked_features;
  42     unsigned long long backend_features;
  43     bool started;
  44     bool log_enabled;
  45     vhost_log_chunk_t *log;
  46     unsigned long long log_size;
  47     bool force;
  48 };
  49
  50 int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
  51                    bool force);
  52 void vhost_dev_cleanup(struct vhost_dev *hdev);
  53 bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);
  54 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  55 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  56 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  57 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  58
  59 /* Test and clear masked event pending status.
  60  * Should be called after unmask to avoid losing events.
  61  */
  62 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  63
  64 /* Mask/unmask events from this vq.
  65  */
  66 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  67                           bool mask);
  68 #endif