block/export: Add query-block-exports
[qemu.git] / include / hw / virtio / vhost.h
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 int nvqs;
75 /* the first virtqueue which would be used by this vhost dev */
76 int vq_index;
77 uint64_t features;
78 uint64_t acked_features;
79 uint64_t backend_features;
80 uint64_t protocol_features;
81 uint64_t max_queues;
82 uint64_t backend_cap;
83 bool started;
84 bool log_enabled;
85 uint64_t log_size;
86 Error *migration_blocker;
87 const VhostOps *vhost_ops;
88 void *opaque;
89 struct vhost_log *log;
90 QLIST_ENTRY(vhost_dev) entry;
91 QLIST_HEAD(, vhost_iommu) iommu_list;
92 IOMMUNotifier n;
93 const VhostDevConfigOps *config_ops;
94 };
95
96 struct vhost_net {
97 struct vhost_dev dev;
98 struct vhost_virtqueue vqs[2];
99 int backend;
100 NetClientState *nc;
101 };
102
103 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
104 VhostBackendType backend_type,
105 uint32_t busyloop_timeout);
106 void vhost_dev_cleanup(struct vhost_dev *hdev);
107 int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
108 void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
109 int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
110 void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
111
112 /* Test and clear masked event pending status.
113 * Should be called after unmask to avoid losing events.
114 */
115 bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
116
117 /* Mask/unmask events from this vq.
118 */
119 void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
120 bool mask);
121 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
122 uint64_t features);
123 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
124 uint64_t features);
125 bool vhost_has_free_slot(void);
126
127 int vhost_net_set_backend(struct vhost_dev *hdev,
128 struct vhost_vring_file *file);
129
130 int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
131 int vhost_dev_get_config(struct vhost_dev *dev, uint8_t *config,
132 uint32_t config_len);
133 int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
134 uint32_t offset, uint32_t size, uint32_t flags);
135 /* notifier callback in case vhost device config space changed
136 */
137 void vhost_dev_set_config_notifier(struct vhost_dev *dev,
138 const VhostDevConfigOps *ops);
139
140 void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
141 void vhost_dev_free_inflight(struct vhost_inflight *inflight);
142 void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);
143 int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f);
144 int vhost_dev_set_inflight(struct vhost_dev *dev,
145 struct vhost_inflight *inflight);
146 int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
147 struct vhost_inflight *inflight);
148 #endif