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