include/hw/virtio/vhost.h

   1 #ifndef VHOST_H
   2 #define VHOST_H
   3
   4 #include "hw/virtio/vhost-backend.h"
   5 #include "hw/virtio/virtio.h"
   6 #include "exec/memory.h"
   7
   8 /* Generic structures common for any vhost based device. */
   9
  10 struct vhost_inflight {
  11     int fd;
  12     void *addr;
  13     uint64_t size;
  14     uint64_t offset;
  15     uint16_t queue_size;
  16 };
  17
  18 struct vhost_virtqueue {
  19     int kick;
  20     int call;
  21     void *desc;
  22     void *avail;
  23     void *used;
  24     int num;
  25     unsigned long long desc_phys;
  26     unsigned desc_size;
  27     unsigned long long avail_phys;
  28     unsigned avail_size;
  29     unsigned long long used_phys;
  30     unsigned used_size;
  31     EventNotifier masked_notifier;
  32     struct vhost_dev *dev;
  33 };
  34
  35 typedef unsigned long vhost_log_chunk_t;
  36 #define VHOST_LOG_PAGE 0x1000
  37 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
  38 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
  39 #define VHOST_INVALID_FEATURE_BIT   (0xff)
  40
  41 struct vhost_log {
  42     unsigned long long size;
  43     int refcnt;
  44     int fd;
  45     vhost_log_chunk_t *log;
  46 };
  47
  48 struct vhost_dev;
  49 struct vhost_iommu {
  50     struct vhost_dev *hdev;
  51     MemoryRegion *mr;
  52     hwaddr iommu_offset;
  53     IOMMUNotifier n;
  54     QLIST_ENTRY(vhost_iommu) iommu_next;
  55 };
  56
  57 typedef struct VhostDevConfigOps {
  58     /* Vhost device config space changed callback
  59      */
  60     int (*vhost_dev_config_notifier)(struct vhost_dev *dev);
  61 } VhostDevConfigOps;
  62
  63 struct vhost_memory;
  64 struct vhost_dev {
  65     VirtIODevice *vdev;
  66     MemoryListener memory_listener;
  67     MemoryListener iommu_listener;
  68     struct vhost_memory *mem;
  69     int n_mem_sections;
  70     MemoryRegionSection *mem_sections;
  71     int n_tmp_sections;
  72     MemoryRegionSection *tmp_sections;
  73     struct vhost_virtqueue *vqs;
  74     int nvqs;
  75     /* the first virtqueue which would be used by this vhost dev */
  76     int vq_index;
  77     uint64_t features;
  78     uint64_t acked_features;
  79     uint64_t backend_features;
  80     uint64_t protocol_features;
  81     uint64_t max_queues;
  82     uint64_t backend_cap;
  83     bool started;
  84     bool log_enabled;
  85     uint64_t log_size;
  86     Error *migration_blocker;
  87     const VhostOps *vhost_ops;
  88     void *opaque;
  89     struct vhost_log *log;
  90     QLIST_ENTRY(vhost_dev) entry;
  91     QLIST_HEAD(, vhost_iommu) iommu_list;
  92     IOMMUNotifier n;
  93     const VhostDevConfigOps *config_ops;
  94 };
  95
  96 struct vhost_net {
  97     struct vhost_dev dev;
  98     struct vhost_virtqueue vqs[2];
  99     int backend;
 100     NetClientState *nc;
 101 };
 102
 103 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
 104                    VhostBackendType backend_type,
 105                    uint32_t busyloop_timeout);
 106 void vhost_dev_cleanup(struct vhost_dev *hdev);
 107 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
 108 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
 109 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
 110 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
 111
 112 /* Test and clear masked event pending status.
 113  * Should be called after unmask to avoid losing events.
 114  */
 115 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
 116
 117 /* Mask/unmask events from this vq.
 118  */
 119 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
 120                           bool mask);
 121 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
 122                             uint64_t features);
 123 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
 124                         uint64_t features);
 125 bool vhost_has_free_slot(void);
 126
 127 int vhost_net_set_backend(struct vhost_dev *hdev,
 128                           struct vhost_vring_file *file);
 129
 130 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
 131 int vhost_dev_get_config(struct vhost_dev *dev, uint8_t *config,
 132                          uint32_t config_len);
 133 int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
 134                          uint32_t offset, uint32_t size, uint32_t flags);
 135 /* notifier callback in case vhost device config space changed
 136  */
 137 void vhost_dev_set_config_notifier(struct vhost_dev *dev,
 138                                    const VhostDevConfigOps *ops);
 139
 140 void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
 141 void vhost_dev_free_inflight(struct vhost_inflight *inflight);
 142 void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);
 143 int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f);
 144 int vhost_dev_prepare_inflight(struct vhost_dev *hdev, VirtIODevice *vdev);
 145 int vhost_dev_set_inflight(struct vhost_dev *dev,
 146                            struct vhost_inflight *inflight);
 147 int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
 148                            struct vhost_inflight *inflight);
 149 #endif