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