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. */
  10 struct 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
  27 typedef 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
  33 struct vhost_log {
  34     unsigned long long size;
  35     int refcnt;
  36     int fd;
  37     vhost_log_chunk_t *log;
  38 };
  39
  40 struct vhost_dev;
  41 struct 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
  49 struct vhost_memory;
  50 struct 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
  81 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
  82                    VhostBackendType backend_type,
  83                    uint32_t busyloop_timeout);
  84 void vhost_dev_cleanup(struct vhost_dev *hdev);
  85 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
  86 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
  87 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
  88 void 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  */
  93 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
  94
  95 /* Mask/unmask events from this vq.
  96  */
  97 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
  98                           bool mask);
  99 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
 100                             uint64_t features);
 101 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
 102                         uint64_t features);
 103 bool vhost_has_free_slot(void);
 104
 105 int vhost_net_set_backend(struct vhost_dev *hdev,
 106                           struct vhost_vring_file *file);
 107
 108 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
 109 #endif