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 unsigned int nvqs; 75 /* the first virtqueue which would be used by this vhost dev */ 76 int vq_index; 77 /* one past the last vq index for the virtio device (not vhost) */ 78 int vq_index_end; 79 /* if non-zero, minimum required value for max_queues */ 80 int num_queues; 81 uint64_t features; 82 uint64_t acked_features; 83 uint64_t backend_features; 84 uint64_t protocol_features; 85 uint64_t max_queues; 86 uint64_t backend_cap; 87 bool started; 88 bool log_enabled; 89 uint64_t log_size; 90 Error *migration_blocker; 91 const VhostOps *vhost_ops; 92 void *opaque; 93 struct vhost_log *log; 94 QLIST_ENTRY(vhost_dev) entry; 95 QLIST_HEAD(, vhost_iommu) iommu_list; 96 IOMMUNotifier n; 97 const VhostDevConfigOps *config_ops; 98 }; 99 100 extern const VhostOps kernel_ops; 101 extern const VhostOps user_ops; 102 extern const VhostOps vdpa_ops; 103 104 struct vhost_net { 105 struct vhost_dev dev; 106 struct vhost_virtqueue vqs[2]; 107 int backend; 108 NetClientState *nc; 109 }; 110 111 int vhost_dev_init(struct vhost_dev *hdev, void *opaque, 112 VhostBackendType backend_type, 113 uint32_t busyloop_timeout, Error **errp); 114 void vhost_dev_cleanup(struct vhost_dev *hdev); 115 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev); 116 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev); 117 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 118 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 119 120 /* Test and clear masked event pending status. 121 * Should be called after unmask to avoid losing events. 122 */ 123 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n); 124 125 /* Mask/unmask events from this vq. 126 */ 127 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 128 bool mask); 129 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 130 uint64_t features); 131 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 132 uint64_t features); 133 bool vhost_has_free_slot(void); 134 135 int vhost_net_set_backend(struct vhost_dev *hdev, 136 struct vhost_vring_file *file); 137 138 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write); 139 int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, 140 uint32_t config_len, Error **errp); 141 int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data, 142 uint32_t offset, uint32_t size, uint32_t flags); 143 /* notifier callback in case vhost device config space changed 144 */ 145 void vhost_dev_set_config_notifier(struct vhost_dev *dev, 146 const VhostDevConfigOps *ops); 147 148 void vhost_dev_reset_inflight(struct vhost_inflight *inflight); 149 void vhost_dev_free_inflight(struct vhost_inflight *inflight); 150 void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f); 151 int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f); 152 int vhost_dev_prepare_inflight(struct vhost_dev *hdev, VirtIODevice *vdev); 153 int vhost_dev_set_inflight(struct vhost_dev *dev, 154 struct vhost_inflight *inflight); 155 int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size, 156 struct vhost_inflight *inflight); 157 #endif 158