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 typedef struct VhostDevConfigOps { 50 /* Vhost device config space changed callback 51 */ 52 int (*vhost_dev_config_notifier)(struct vhost_dev *dev); 53 } VhostDevConfigOps; 54 55 struct vhost_memory; 56 struct vhost_dev { 57 VirtIODevice *vdev; 58 MemoryListener memory_listener; 59 MemoryListener iommu_listener; 60 struct vhost_memory *mem; 61 int n_mem_sections; 62 MemoryRegionSection *mem_sections; 63 struct vhost_virtqueue *vqs; 64 int nvqs; 65 /* the first virtqueue which would be used by this vhost dev */ 66 int vq_index; 67 uint64_t features; 68 uint64_t acked_features; 69 uint64_t backend_features; 70 uint64_t protocol_features; 71 uint64_t max_queues; 72 bool started; 73 bool log_enabled; 74 uint64_t log_size; 75 Error *migration_blocker; 76 bool memory_changed; 77 hwaddr mem_changed_start_addr; 78 hwaddr mem_changed_end_addr; 79 const VhostOps *vhost_ops; 80 void *opaque; 81 struct vhost_log *log; 82 QLIST_ENTRY(vhost_dev) entry; 83 QLIST_HEAD(, vhost_iommu) iommu_list; 84 IOMMUNotifier n; 85 const VhostDevConfigOps *config_ops; 86 }; 87 88 int vhost_dev_init(struct vhost_dev *hdev, void *opaque, 89 VhostBackendType backend_type, 90 uint32_t busyloop_timeout); 91 void vhost_dev_cleanup(struct vhost_dev *hdev); 92 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev); 93 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev); 94 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 95 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 96 97 /* Test and clear masked event pending status. 98 * Should be called after unmask to avoid losing events. 99 */ 100 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n); 101 102 /* Mask/unmask events from this vq. 103 */ 104 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 105 bool mask); 106 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 107 uint64_t features); 108 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 109 uint64_t features); 110 bool vhost_has_free_slot(void); 111 112 int vhost_net_set_backend(struct vhost_dev *hdev, 113 struct vhost_vring_file *file); 114 115 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write); 116 int vhost_dev_get_config(struct vhost_dev *dev, uint8_t *config, 117 uint32_t config_len); 118 int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data, 119 uint32_t offset, uint32_t size, uint32_t flags); 120 /* notifier callback in case vhost device config space changed 121 */ 122 void vhost_dev_set_config_notifier(struct vhost_dev *dev, 123 const VhostDevConfigOps *ops); 124 #endif 125