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 used_phys;
  18    unsigned used_size;
  19    void *ring;
  20    unsigned long long ring_phys;
  21    unsigned ring_size;
  22    EventNotifier masked_notifier;
  23};
  24
  25typedef unsigned long vhost_log_chunk_t;
  26#define VHOST_LOG_PAGE 0x1000
  27#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  28#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  29#define VHOST_INVALID_FEATURE_BIT   (0xff)
  30
  31struct vhost_log {
  32    unsigned long long size;
  33    int refcnt;
  34    int fd;
  35    vhost_log_chunk_t *log;
  36};
  37
  38struct vhost_memory;
  39struct vhost_dev {
  40    MemoryListener memory_listener;
  41    struct vhost_memory *mem;
  42    int n_mem_sections;
  43    MemoryRegionSection *mem_sections;
  44    struct vhost_virtqueue *vqs;
  45    int nvqs;
  46    /* the first virtqueue which would be used by this vhost dev */
  47    int vq_index;
  48    uint64_t features;
  49    uint64_t acked_features;
  50    uint64_t backend_features;
  51    uint64_t protocol_features;
  52    uint64_t max_queues;
  53    bool started;
  54    bool log_enabled;
  55    uint64_t log_size;
  56    Error *migration_blocker;
  57    bool memory_changed;
  58    hwaddr mem_changed_start_addr;
  59    hwaddr mem_changed_end_addr;
  60    const VhostOps *vhost_ops;
  61    void *opaque;
  62    struct vhost_log *log;
  63    QLIST_ENTRY(vhost_dev) entry;
  64};
  65
  66int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
  67                   VhostBackendType backend_type);
  68void vhost_dev_cleanup(struct vhost_dev *hdev);
  69int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  70void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  71int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  72void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  73
  74/* Test and clear masked event pending status.
  75 * Should be called after unmask to avoid losing events.
  76 */
  77bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  78
  79/* Mask/unmask events from this vq.
  80 */
  81void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  82                          bool mask);
  83uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
  84                            uint64_t features);
  85void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
  86                        uint64_t features);
  87bool vhost_has_free_slot(void);
  88#endif
  89