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Commit | Line | Data |
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967f97fa AL |
1 | /* |
2 | * Virtio Support | |
3 | * | |
4 | * Copyright IBM, Corp. 2007 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
2a6a4076 MA |
14 | #ifndef QEMU_VIRTIO_H |
15 | #define QEMU_VIRTIO_H | |
967f97fa | 16 | |
83c9f4ca | 17 | #include "hw/hw.h" |
1422e32d | 18 | #include "net/net.h" |
83c9f4ca | 19 | #include "hw/qdev.h" |
9c17d615 | 20 | #include "sysemu/sysemu.h" |
1de7afc9 | 21 | #include "qemu/event_notifier.h" |
e9600c6c MT |
22 | #include "standard-headers/linux/virtio_config.h" |
23 | #include "standard-headers/linux/virtio_ring.h" | |
967f97fa | 24 | |
8eca6b1b AL |
25 | /* A guest should never accept this. It implies negotiation is broken. */ |
26 | #define VIRTIO_F_BAD_FEATURE 30 | |
967f97fa | 27 | |
5f456073 MT |
28 | #define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \ |
29 | (0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \ | |
30 | (0x1ULL << VIRTIO_F_ANY_LAYOUT)) | |
31 | ||
967f97fa AL |
32 | struct VirtQueue; |
33 | ||
a8170e5e | 34 | static inline hwaddr vring_align(hwaddr addr, |
f46f15bc AL |
35 | unsigned long align) |
36 | { | |
37 | return (addr + align - 1) & ~(align - 1); | |
38 | } | |
39 | ||
967f97fa | 40 | typedef struct VirtQueue VirtQueue; |
967f97fa AL |
41 | |
42 | #define VIRTQUEUE_MAX_SIZE 1024 | |
43 | ||
44 | typedef struct VirtQueueElement | |
45 | { | |
46 | unsigned int index; | |
47 | unsigned int out_num; | |
48 | unsigned int in_num; | |
3724650d PB |
49 | hwaddr *in_addr; |
50 | hwaddr *out_addr; | |
51 | struct iovec *in_sg; | |
52 | struct iovec *out_sg; | |
967f97fa AL |
53 | } VirtQueueElement; |
54 | ||
b829c2a9 | 55 | #define VIRTIO_QUEUE_MAX 1024 |
967f97fa | 56 | |
7055e687 MT |
57 | #define VIRTIO_NO_VECTOR 0xffff |
58 | ||
8e05db92 FK |
59 | #define TYPE_VIRTIO_DEVICE "virtio-device" |
60 | #define VIRTIO_DEVICE_GET_CLASS(obj) \ | |
61 | OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE) | |
62 | #define VIRTIO_DEVICE_CLASS(klass) \ | |
63 | OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE) | |
64 | #define VIRTIO_DEVICE(obj) \ | |
65 | OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE) | |
66 | ||
616a6552 GK |
67 | enum virtio_device_endian { |
68 | VIRTIO_DEVICE_ENDIAN_UNKNOWN, | |
69 | VIRTIO_DEVICE_ENDIAN_LITTLE, | |
70 | VIRTIO_DEVICE_ENDIAN_BIG, | |
71 | }; | |
72 | ||
967f97fa AL |
73 | struct VirtIODevice |
74 | { | |
8e05db92 | 75 | DeviceState parent_obj; |
967f97fa | 76 | const char *name; |
967f97fa AL |
77 | uint8_t status; |
78 | uint8_t isr; | |
79 | uint16_t queue_sel; | |
019a3edb GH |
80 | uint64_t guest_features; |
81 | uint64_t host_features; | |
967f97fa AL |
82 | size_t config_len; |
83 | void *config; | |
7055e687 | 84 | uint16_t config_vector; |
b8f05908 | 85 | uint32_t generation; |
7055e687 | 86 | int nvectors; |
967f97fa | 87 | VirtQueue *vq; |
53c25cea | 88 | uint16_t device_id; |
85cf2a8d | 89 | bool vm_running; |
f5ed3663 | 90 | bool broken; /* device in invalid state, needs reset */ |
85cf2a8d | 91 | VMChangeStateEntry *vmstate; |
1034e9cf | 92 | char *bus_name; |
616a6552 | 93 | uint8_t device_endian; |
5669655a | 94 | bool use_guest_notifier_mask; |
850d0070 | 95 | QLIST_HEAD(, VirtQueue) *vector_queues; |
967f97fa AL |
96 | }; |
97 | ||
8e05db92 | 98 | typedef struct VirtioDeviceClass { |
0ba94b6f | 99 | /*< private >*/ |
8e05db92 | 100 | DeviceClass parent; |
0ba94b6f | 101 | /*< public >*/ |
1d244b42 AF |
102 | |
103 | /* This is what a VirtioDevice must implement */ | |
1d244b42 | 104 | DeviceRealize realize; |
306ec6c3 | 105 | DeviceUnrealize unrealize; |
9d5b731d JW |
106 | uint64_t (*get_features)(VirtIODevice *vdev, |
107 | uint64_t requested_features, | |
108 | Error **errp); | |
019a3edb | 109 | uint64_t (*bad_features)(VirtIODevice *vdev); |
d5aaa1b0 | 110 | void (*set_features)(VirtIODevice *vdev, uint64_t val); |
0b352fd6 | 111 | int (*validate_features)(VirtIODevice *vdev); |
8e05db92 FK |
112 | void (*get_config)(VirtIODevice *vdev, uint8_t *config); |
113 | void (*set_config)(VirtIODevice *vdev, const uint8_t *config); | |
114 | void (*reset)(VirtIODevice *vdev); | |
115 | void (*set_status)(VirtIODevice *vdev, uint8_t val); | |
6a87acf7 FK |
116 | /* Test and clear event pending status. |
117 | * Should be called after unmask to avoid losing events. | |
118 | * If backend does not support masking, | |
119 | * must check in frontend instead. | |
120 | */ | |
121 | bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); | |
122 | /* Mask/unmask events from this vq. Any events reported | |
123 | * while masked will become pending. | |
124 | * If backend does not support masking, | |
125 | * must mask in frontend instead. | |
126 | */ | |
127 | void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); | |
ff4c07df PB |
128 | int (*start_ioeventfd)(VirtIODevice *vdev); |
129 | void (*stop_ioeventfd)(VirtIODevice *vdev); | |
ea43e259 DDAG |
130 | /* Saving and loading of a device; trying to deprecate save/load |
131 | * use vmsd for new devices. | |
132 | */ | |
1b5fc0de GK |
133 | void (*save)(VirtIODevice *vdev, QEMUFile *f); |
134 | int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id); | |
ea43e259 | 135 | const VMStateDescription *vmsd; |
8e05db92 FK |
136 | } VirtioDeviceClass; |
137 | ||
c8075caf GA |
138 | void virtio_instance_init_common(Object *proxy_obj, void *data, |
139 | size_t vdev_size, const char *vdev_name); | |
140 | ||
8e05db92 FK |
141 | void virtio_init(VirtIODevice *vdev, const char *name, |
142 | uint16_t device_id, size_t config_size); | |
6a1a8cc7 | 143 | void virtio_cleanup(VirtIODevice *vdev); |
8e05db92 | 144 | |
f5ed3663 SH |
145 | void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3); |
146 | ||
1034e9cf FK |
147 | /* Set the child bus name. */ |
148 | void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); | |
149 | ||
bf1780b0 FZ |
150 | typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *); |
151 | ||
967f97fa | 152 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, |
bf1780b0 | 153 | VirtIOHandleOutput handle_output); |
967f97fa | 154 | |
f23fd811 JW |
155 | void virtio_del_queue(VirtIODevice *vdev, int n); |
156 | ||
3724650d | 157 | void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num); |
967f97fa AL |
158 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
159 | unsigned int len); | |
160 | void virtqueue_flush(VirtQueue *vq, unsigned int count); | |
2640d2a5 SH |
161 | void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, |
162 | unsigned int len); | |
29b9f5ef JW |
163 | void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem, |
164 | unsigned int len); | |
297a75e6 | 165 | bool virtqueue_rewind(VirtQueue *vq, unsigned int num); |
967f97fa AL |
166 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
167 | unsigned int len, unsigned int idx); | |
168 | ||
8059feee | 169 | void virtqueue_map(VirtQueueElement *elem); |
51b19ebe | 170 | void *virtqueue_pop(VirtQueue *vq, size_t sz); |
ab281c17 PB |
171 | void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz); |
172 | void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem); | |
0d8d7690 AS |
173 | int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, |
174 | unsigned int out_bytes); | |
175 | void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, | |
e1f7b481 MT |
176 | unsigned int *out_bytes, |
177 | unsigned max_in_bytes, unsigned max_out_bytes); | |
967f97fa | 178 | |
adb3feda | 179 | bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq); |
967f97fa AL |
180 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); |
181 | ||
182 | void virtio_save(VirtIODevice *vdev, QEMUFile *f); | |
5943124c | 183 | |
1a665855 HP |
184 | extern const VMStateInfo virtio_vmstate_info; |
185 | ||
1a665855 HP |
186 | #define VMSTATE_VIRTIO_DEVICE \ |
187 | { \ | |
188 | .name = "virtio", \ | |
189 | .info = &virtio_vmstate_info, \ | |
190 | .flags = VMS_SINGLE, \ | |
191 | } | |
192 | ||
1b5fc0de | 193 | int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); |
967f97fa AL |
194 | |
195 | void virtio_notify_config(VirtIODevice *vdev); | |
196 | ||
197 | void virtio_queue_set_notification(VirtQueue *vq, int enable); | |
198 | ||
199 | int virtio_queue_ready(VirtQueue *vq); | |
200 | ||
201 | int virtio_queue_empty(VirtQueue *vq); | |
202 | ||
53c25cea PB |
203 | /* Host binding interface. */ |
204 | ||
53c25cea PB |
205 | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); |
206 | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); | |
207 | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); | |
208 | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); | |
209 | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); | |
210 | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); | |
adfb743c MT |
211 | uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr); |
212 | uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr); | |
213 | uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr); | |
214 | void virtio_config_modern_writeb(VirtIODevice *vdev, | |
215 | uint32_t addr, uint32_t data); | |
216 | void virtio_config_modern_writew(VirtIODevice *vdev, | |
217 | uint32_t addr, uint32_t data); | |
218 | void virtio_config_modern_writel(VirtIODevice *vdev, | |
219 | uint32_t addr, uint32_t data); | |
a8170e5e AK |
220 | void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); |
221 | hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); | |
e63c0ba1 | 222 | void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); |
53c25cea | 223 | int virtio_queue_get_num(VirtIODevice *vdev, int n); |
8ad176aa | 224 | int virtio_get_num_queues(VirtIODevice *vdev); |
ab223c95 CH |
225 | void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, |
226 | hwaddr avail, hwaddr used); | |
227 | void virtio_queue_update_rings(VirtIODevice *vdev, int n); | |
6ce69d1c | 228 | void virtio_queue_set_align(VirtIODevice *vdev, int n, int align); |
53c25cea | 229 | void virtio_queue_notify(VirtIODevice *vdev, int n); |
7055e687 MT |
230 | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); |
231 | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); | |
0b352fd6 | 232 | int virtio_set_status(VirtIODevice *vdev, uint8_t val); |
53c25cea PB |
233 | void virtio_reset(void *opaque); |
234 | void virtio_update_irq(VirtIODevice *vdev); | |
d5aaa1b0 | 235 | int virtio_set_features(VirtIODevice *vdev, uint64_t val); |
53c25cea | 236 | |
53c25cea | 237 | /* Base devices. */ |
12c5674b | 238 | typedef struct VirtIOBlkConf VirtIOBlkConf; |
f0c07c7c | 239 | struct virtio_net_conf; |
6b331efb | 240 | typedef struct virtio_serial_conf virtio_serial_conf; |
f73ddbad | 241 | typedef struct virtio_input_conf virtio_input_conf; |
973abc7f | 242 | typedef struct VirtIOSCSIConf VirtIOSCSIConf; |
16c915ba | 243 | typedef struct VirtIORNGConf VirtIORNGConf; |
97b15621 | 244 | |
8172539d | 245 | #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ |
019a3edb GH |
246 | DEFINE_PROP_BIT64("indirect_desc", _state, _field, \ |
247 | VIRTIO_RING_F_INDIRECT_DESC, true), \ | |
248 | DEFINE_PROP_BIT64("event_idx", _state, _field, \ | |
249 | VIRTIO_RING_F_EVENT_IDX, true), \ | |
250 | DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \ | |
09999a5f MT |
251 | VIRTIO_F_NOTIFY_ON_EMPTY, true), \ |
252 | DEFINE_PROP_BIT64("any_layout", _state, _field, \ | |
253 | VIRTIO_F_ANY_LAYOUT, true) | |
8172539d | 254 | |
a8170e5e AK |
255 | hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); |
256 | hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); | |
257 | hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); | |
258 | hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n); | |
259 | hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); | |
260 | hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); | |
261 | hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); | |
262 | hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n); | |
1cbdabe2 MT |
263 | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); |
264 | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); | |
6793dfd1 | 265 | void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n); |
1cbdabe2 | 266 | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); |
e78a2b42 | 267 | uint16_t virtio_get_queue_index(VirtQueue *vq); |
1cbdabe2 | 268 | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); |
15b2bd18 PB |
269 | void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, |
270 | bool with_irqfd); | |
ff4c07df PB |
271 | int virtio_device_start_ioeventfd(VirtIODevice *vdev); |
272 | void virtio_device_stop_ioeventfd(VirtIODevice *vdev); | |
8e93cef1 | 273 | bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev); |
1cbdabe2 | 274 | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); |
fa283a4a | 275 | void virtio_queue_host_notifier_read(EventNotifier *n); |
a1afb606 | 276 | void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, |
a378b49a PB |
277 | void (*fn)(VirtIODevice *, |
278 | VirtQueue *)); | |
1cbdabe2 | 279 | void virtio_irq(VirtQueue *vq); |
e0d686bf JW |
280 | VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); |
281 | VirtQueue *virtio_vector_next_queue(VirtQueue *vq); | |
98ed8ecf | 282 | |
019a3edb | 283 | static inline void virtio_add_feature(uint64_t *features, unsigned int fbit) |
0cd09c3a | 284 | { |
019a3edb | 285 | assert(fbit < 64); |
d5aaa1b0 | 286 | *features |= (1ULL << fbit); |
0cd09c3a CH |
287 | } |
288 | ||
019a3edb | 289 | static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit) |
0cd09c3a | 290 | { |
019a3edb | 291 | assert(fbit < 64); |
d5aaa1b0 | 292 | *features &= ~(1ULL << fbit); |
0cd09c3a CH |
293 | } |
294 | ||
95129d6f | 295 | static inline bool virtio_has_feature(uint64_t features, unsigned int fbit) |
ef546f12 | 296 | { |
019a3edb | 297 | assert(fbit < 64); |
d5aaa1b0 | 298 | return !!(features & (1ULL << fbit)); |
ef546f12 CH |
299 | } |
300 | ||
95129d6f CH |
301 | static inline bool virtio_vdev_has_feature(VirtIODevice *vdev, |
302 | unsigned int fbit) | |
ef546f12 | 303 | { |
95129d6f | 304 | return virtio_has_feature(vdev->guest_features, fbit); |
ef546f12 CH |
305 | } |
306 | ||
74aae7b2 JW |
307 | static inline bool virtio_host_has_feature(VirtIODevice *vdev, |
308 | unsigned int fbit) | |
309 | { | |
95129d6f | 310 | return virtio_has_feature(vdev->host_features, fbit); |
74aae7b2 JW |
311 | } |
312 | ||
616a6552 | 313 | static inline bool virtio_is_big_endian(VirtIODevice *vdev) |
98ed8ecf | 314 | { |
95129d6f | 315 | if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { |
3c185597 CH |
316 | assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); |
317 | return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; | |
318 | } | |
319 | /* Devices conforming to VIRTIO 1.0 or later are always LE. */ | |
320 | return false; | |
98ed8ecf | 321 | } |
967f97fa | 322 | #endif |