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,
  68                   uint32_t busyloop_timeout);
  69void vhost_dev_cleanup(struct vhost_dev *hdev);
  70int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  71void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  72int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  73void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  74
  75/* Test and clear masked event pending status.
  76 * Should be called after unmask to avoid losing events.
  77 */
  78bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  79
  80/* Mask/unmask events from this vq.
  81 */
  82void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  83                          bool mask);
  84uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
  85                            uint64_t features);
  86void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
  87                        uint64_t features);
  88bool vhost_has_free_slot(void);
  89
  90int vhost_net_set_backend(struct vhost_dev *hdev,
  91                          struct vhost_vring_file *file);
  92
  93#endif
  94