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 used_phys; 18 unsigned used_size; 19 void *ring; 20 unsigned long long ring_phys; 21 unsigned ring_size; 22 EventNotifier masked_notifier; 23 }; 24 25 typedef unsigned long vhost_log_chunk_t; 26 #define VHOST_LOG_PAGE 0x1000 27 #define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t)) 28 #define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS) 29 #define VHOST_INVALID_FEATURE_BIT (0xff) 30 31 struct vhost_log { 32 unsigned long long size; 33 int refcnt; 34 int fd; 35 vhost_log_chunk_t *log; 36 }; 37 38 struct vhost_memory; 39 struct vhost_dev { 40 MemoryListener memory_listener; 41 struct vhost_memory *mem; 42 int n_mem_sections; 43 MemoryRegionSection *mem_sections; 44 struct vhost_virtqueue *vqs; 45 int nvqs; 46 /* the first virtqueue which would be used by this vhost dev */ 47 int vq_index; 48 uint64_t features; 49 uint64_t acked_features; 50 uint64_t backend_features; 51 uint64_t protocol_features; 52 uint64_t max_queues; 53 bool started; 54 bool log_enabled; 55 uint64_t log_size; 56 Error *migration_blocker; 57 bool memory_changed; 58 hwaddr mem_changed_start_addr; 59 hwaddr mem_changed_end_addr; 60 const VhostOps *vhost_ops; 61 void *opaque; 62 struct vhost_log *log; 63 QLIST_ENTRY(vhost_dev) entry; 64 }; 65 66 int vhost_dev_init(struct vhost_dev *hdev, void *opaque, 67 VhostBackendType backend_type); 68 void vhost_dev_cleanup(struct vhost_dev *hdev); 69 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev); 70 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev); 71 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 72 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 73 74 /* Test and clear masked event pending status. 75 * Should be called after unmask to avoid losing events. 76 */ 77 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n); 78 79 /* Mask/unmask events from this vq. 80 */ 81 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 82 bool mask); 83 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 84 uint64_t features); 85 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 86 uint64_t features); 87 bool vhost_has_free_slot(void); 88 #endif 89