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/vhost-backend.h"
   6#include "hw/virtio/virtio.h"
   7#include "exec/memory.h"
   8
   9/* Generic structures common for any vhost based device. */
  10struct vhost_virtqueue {
  11    int kick;
  12    int call;
  13    void *desc;
  14    void *avail;
  15    void *used;
  16    int num;
  17    unsigned long long desc_phys;
  18    unsigned desc_size;
  19    unsigned long long avail_phys;
  20    unsigned avail_size;
  21    unsigned long long used_phys;
  22    unsigned used_size;
  23    EventNotifier masked_notifier;
  24};
  25
  26typedef unsigned long vhost_log_chunk_t;
  27#define VHOST_LOG_PAGE 0x1000
  28#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  29#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  30#define VHOST_INVALID_FEATURE_BIT   (0xff)
  31
  32struct vhost_log {
  33    unsigned long long size;
  34    int refcnt;
  35    int fd;
  36    vhost_log_chunk_t *log;
  37};
  38
  39struct vhost_memory;
  40struct vhost_dev {
  41    MemoryListener memory_listener;
  42    struct vhost_memory *mem;
  43    int n_mem_sections;
  44    MemoryRegionSection *mem_sections;
  45    struct vhost_virtqueue *vqs;
  46    int nvqs;
  47    /* the first virtqueue which would be used by this vhost dev */
  48    int vq_index;
  49    uint64_t features;
  50    uint64_t acked_features;
  51    uint64_t backend_features;
  52    uint64_t protocol_features;
  53    uint64_t max_queues;
  54    bool started;
  55    bool log_enabled;
  56    uint64_t log_size;
  57    Error *migration_blocker;
  58    bool memory_changed;
  59    hwaddr mem_changed_start_addr;
  60    hwaddr mem_changed_end_addr;
  61    const VhostOps *vhost_ops;
  62    void *opaque;
  63    struct vhost_log *log;
  64    QLIST_ENTRY(vhost_dev) entry;
  65};
  66
  67int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
  68                   VhostBackendType backend_type,
  69                   uint32_t busyloop_timeout);
  70void vhost_dev_cleanup(struct vhost_dev *hdev);
  71int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  72void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  73int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  74void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  75
  76/* Test and clear masked event pending status.
  77 * Should be called after unmask to avoid losing events.
  78 */
  79bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  80
  81/* Mask/unmask events from this vq.
  82 */
  83void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  84                          bool mask);
  85uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
  86                            uint64_t features);
  87void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
  88                        uint64_t features);
  89bool vhost_has_free_slot(void);
  90
  91int vhost_net_set_backend(struct vhost_dev *hdev,
  92                          struct vhost_vring_file *file);
  93
  94#endif
  95