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    struct vhost_dev *dev;
  25};
  26
  27typedef unsigned long vhost_log_chunk_t;
  28#define VHOST_LOG_PAGE 0x1000
  29#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  30#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  31#define VHOST_INVALID_FEATURE_BIT   (0xff)
  32
  33struct vhost_log {
  34    unsigned long long size;
  35    int refcnt;
  36    int fd;
  37    vhost_log_chunk_t *log;
  38};
  39
  40struct vhost_dev;
  41struct vhost_iommu {
  42    struct vhost_dev *hdev;
  43    MemoryRegion *mr;
  44    hwaddr iommu_offset;
  45    IOMMUNotifier n;
  46    QLIST_ENTRY(vhost_iommu) iommu_next;
  47};
  48
  49struct vhost_memory;
  50struct vhost_dev {
  51    VirtIODevice *vdev;
  52    MemoryListener memory_listener;
  53    MemoryListener iommu_listener;
  54    struct vhost_memory *mem;
  55    int n_mem_sections;
  56    MemoryRegionSection *mem_sections;
  57    struct vhost_virtqueue *vqs;
  58    int nvqs;
  59    /* the first virtqueue which would be used by this vhost dev */
  60    int vq_index;
  61    uint64_t features;
  62    uint64_t acked_features;
  63    uint64_t backend_features;
  64    uint64_t protocol_features;
  65    uint64_t max_queues;
  66    bool started;
  67    bool log_enabled;
  68    uint64_t log_size;
  69    Error *migration_blocker;
  70    bool memory_changed;
  71    hwaddr mem_changed_start_addr;
  72    hwaddr mem_changed_end_addr;
  73    const VhostOps *vhost_ops;
  74    void *opaque;
  75    struct vhost_log *log;
  76    QLIST_ENTRY(vhost_dev) entry;
  77    QLIST_HEAD(, vhost_iommu) iommu_list;
  78    IOMMUNotifier n;
  79};
  80
  81int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
  82                   VhostBackendType backend_type,
  83                   uint32_t busyloop_timeout);
  84void vhost_dev_cleanup(struct vhost_dev *hdev);
  85int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  86void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  87int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  88void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  89
  90/* Test and clear masked event pending status.
  91 * Should be called after unmask to avoid losing events.
  92 */
  93bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  94
  95/* Mask/unmask events from this vq.
  96 */
  97void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  98                          bool mask);
  99uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
 100                            uint64_t features);
 101void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
 102                        uint64_t features);
 103bool vhost_has_free_slot(void);
 104
 105int vhost_net_set_backend(struct vhost_dev *hdev,
 106                          struct vhost_vring_file *file);
 107
 108int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
 109#endif
 110