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 vhost_log_chunk_t log[0]; 35 }; 36 37 struct vhost_memory; 38 struct vhost_dev { 39 MemoryListener memory_listener; 40 struct vhost_memory *mem; 41 int n_mem_sections; 42 MemoryRegionSection *mem_sections; 43 struct vhost_virtqueue *vqs; 44 int nvqs; 45 /* the first virtqueue which would be used by this vhost dev */ 46 int vq_index; 47 unsigned long long features; 48 unsigned long long acked_features; 49 unsigned long long backend_features; 50 bool started; 51 bool log_enabled; 52 unsigned long long log_size; 53 Error *migration_blocker; 54 bool memory_changed; 55 hwaddr mem_changed_start_addr; 56 hwaddr mem_changed_end_addr; 57 const VhostOps *vhost_ops; 58 void *opaque; 59 struct vhost_log *log; 60 }; 61 62 int vhost_dev_init(struct vhost_dev *hdev, void *opaque, 63 VhostBackendType backend_type); 64 void vhost_dev_cleanup(struct vhost_dev *hdev); 65 bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev); 66 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev); 67 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev); 68 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 69 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); 70 71 /* Test and clear masked event pending status. 72 * Should be called after unmask to avoid losing events. 73 */ 74 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n); 75 76 /* Mask/unmask events from this vq. 77 */ 78 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, 79 bool mask); 80 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits, 81 uint64_t features); 82 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, 83 uint64_t features); 84 #endif 85