LXR qemu/include/hw/virtio/vhost.h

   1#ifndef VHOST_H
   2#define VHOST_H
   3
   4#include "hw/hw.h"
   5#include "hw/virtio/virtio.h"
   6#include "exec/memory.h"
   7
   8/* Generic structures common for any vhost based device. */
   9struct 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
  24typedef 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
  29struct vhost_memory;
  30struct 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    bool memory_changed;
  49    hwaddr mem_changed_start_addr;
  50    hwaddr mem_changed_end_addr;
  51};
  52
  53int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
  54                   bool force);
  55void vhost_dev_cleanup(struct vhost_dev *hdev);
  56bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);
  57int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  58void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  59int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  60void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  61
  62/* Test and clear masked event pending status.
  63 * Should be called after unmask to avoid losing events.
  64 */
  65bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  66
  67/* Mask/unmask events from this vq.
  68 */
  69void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  70                          bool mask);
  71#endif
  72