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
14 #ifndef QEMU_VIRTIO_H
15 #define QEMU_VIRTIO_H
16
17 #include "system/memory.h"
18 #include "hw/qdev-core.h"
19 #include "net/net.h"
20 #include "migration/vmstate.h"
21 #include "qemu/event_notifier.h"
22 #include "standard-headers/linux/virtio_config.h"
23 #include "standard-headers/linux/virtio_ring.h"
24 #include "qom/object.h"
25 #include "block/aio.h"
26
27 /*
28 * A guest should never accept this. It implies negotiation is broken
29 * between the driver frontend and the device. This bit is re-used for
30 * vhost-user to advertise VHOST_USER_F_PROTOCOL_FEATURES between QEMU
31 * and a vhost-user backend.
32 */
33 #define VIRTIO_F_BAD_FEATURE 30
34
35 #define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \
36 (0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
37 (0x1ULL << VIRTIO_F_ANY_LAYOUT))
38
39 struct VirtQueue;
40
vring_align(hwaddr addr,unsigned long align)41 static inline hwaddr vring_align(hwaddr addr,
42 unsigned long align)
43 {
44 return QEMU_ALIGN_UP(addr, align);
45 }
46
47 typedef struct VirtIOFeature {
48 uint64_t flags;
49 size_t end;
50 } VirtIOFeature;
51
52 typedef struct VirtIOConfigSizeParams {
53 size_t min_size;
54 size_t max_size;
55 const VirtIOFeature *feature_sizes;
56 } VirtIOConfigSizeParams;
57
58 size_t virtio_get_config_size(const VirtIOConfigSizeParams *params,
59 uint64_t host_features);
60
61 typedef struct VirtQueue VirtQueue;
62
63 #define VIRTQUEUE_MAX_SIZE 1024
64
65 typedef struct VirtQueueElement
66 {
67 unsigned int index;
68 unsigned int len;
69 unsigned int ndescs;
70 unsigned int out_num;
71 unsigned int in_num;
72 /* Element has been processed (VIRTIO_F_IN_ORDER) */
73 bool in_order_filled;
74 hwaddr *in_addr;
75 hwaddr *out_addr;
76 struct iovec *in_sg;
77 struct iovec *out_sg;
78 } VirtQueueElement;
79
80 #define VIRTIO_QUEUE_MAX 1024
81
82 #define VIRTIO_NO_VECTOR 0xffff
83
84 /* special index value used internally for config irqs */
85 #define VIRTIO_CONFIG_IRQ_IDX -1
86
87 #define TYPE_VIRTIO_DEVICE "virtio-device"
88 OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE)
89
90 typedef struct {
91 int virtio_bit;
92 const char *feature_desc;
93 } qmp_virtio_feature_map_t;
94
95 enum virtio_device_endian {
96 VIRTIO_DEVICE_ENDIAN_UNKNOWN,
97 VIRTIO_DEVICE_ENDIAN_LITTLE,
98 VIRTIO_DEVICE_ENDIAN_BIG,
99 };
100
101 /**
102 * struct VirtIODevice - common VirtIO structure
103 * @name: name of the device
104 * @status: VirtIO Device Status field
105 *
106 */
107 struct VirtIODevice
108 {
109 DeviceState parent_obj;
110 const char *name;
111 uint8_t status;
112 uint8_t isr;
113 uint16_t queue_sel;
114 /**
115 * These fields represent a set of VirtIO features at various
116 * levels of the stack. @host_features indicates the complete
117 * feature set the VirtIO device can offer to the driver.
118 * @guest_features indicates which features the VirtIO driver has
119 * selected by writing to the feature register. Finally
120 * @backend_features represents everything supported by the
121 * backend (e.g. vhost) and could potentially be a subset of the
122 * total feature set offered by QEMU.
123 */
124 uint64_t host_features;
125 uint64_t guest_features;
126 uint64_t backend_features;
127
128 size_t config_len;
129 void *config;
130 uint16_t config_vector;
131 uint32_t generation;
132 int nvectors;
133 VirtQueue *vq;
134 MemoryListener listener;
135 uint16_t device_id;
136 /* @vm_running: current VM running state via virtio_vmstate_change() */
137 bool vm_running;
138 bool broken; /* device in invalid state, needs reset */
139 bool use_disabled_flag; /* allow use of 'disable' flag when needed */
140 bool disabled; /* device in temporarily disabled state */
141 /**
142 * @use_started: true if the @started flag should be used to check the
143 * current state of the VirtIO device. Otherwise status bits
144 * should be checked for a current status of the device.
145 * @use_started is only set via QMP and defaults to true for all
146 * modern machines (since 4.1).
147 */
148 bool use_started;
149 bool started;
150 bool start_on_kick; /* when virtio 1.0 feature has not been negotiated */
151 bool disable_legacy_check;
152 bool vhost_started;
153 VMChangeStateEntry *vmstate;
154 char *bus_name;
155 uint8_t device_endian;
156 /**
157 * @user_guest_notifier_mask: gate usage of ->guest_notifier_mask() callback.
158 * This is used to suppress the masking of guest updates for
159 * vhost-user devices which are asynchronous by design.
160 */
161 bool use_guest_notifier_mask;
162 AddressSpace *dma_as;
163 QLIST_HEAD(, VirtQueue) *vector_queues;
164 QTAILQ_ENTRY(VirtIODevice) next;
165 /**
166 * @config_notifier: the event notifier that handles config events
167 */
168 EventNotifier config_notifier;
169 bool device_iotlb_enabled;
170 };
171
172 struct VirtioDeviceClass {
173 /*< private >*/
174 DeviceClass parent;
175 /*< public >*/
176
177 /* This is what a VirtioDevice must implement */
178 DeviceRealize realize;
179 DeviceUnrealize unrealize;
180 uint64_t (*get_features)(VirtIODevice *vdev,
181 uint64_t requested_features,
182 Error **errp);
183 uint64_t (*bad_features)(VirtIODevice *vdev);
184 void (*set_features)(VirtIODevice *vdev, uint64_t val);
185 int (*validate_features)(VirtIODevice *vdev);
186 void (*get_config)(VirtIODevice *vdev, uint8_t *config);
187 void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
188 void (*reset)(VirtIODevice *vdev);
189 int (*set_status)(VirtIODevice *vdev, uint8_t val);
190 /* Device must validate queue_index. */
191 void (*queue_reset)(VirtIODevice *vdev, uint32_t queue_index);
192 /* Device must validate queue_index. */
193 void (*queue_enable)(VirtIODevice *vdev, uint32_t queue_index);
194 /* For transitional devices, this is a bitmap of features
195 * that are only exposed on the legacy interface but not
196 * the modern one.
197 */
198 uint64_t legacy_features;
199 /* Test and clear event pending status.
200 * Should be called after unmask to avoid losing events.
201 * If backend does not support masking,
202 * must check in frontend instead.
203 */
204 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);
205 /* Mask/unmask events from this vq. Any events reported
206 * while masked will become pending.
207 * If backend does not support masking,
208 * must mask in frontend instead.
209 */
210 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
211 int (*start_ioeventfd)(VirtIODevice *vdev);
212 void (*stop_ioeventfd)(VirtIODevice *vdev);
213 /*
214 * Called before loading queues.
215 * If the number of queues change at runtime, use @n to know the
216 * number and add or remove queues accordingly.
217 * Note that this function is called in the middle of loading vmsd;
218 * no assumption should be made on states being loaded from vmsd.
219 */
220 int (*pre_load_queues)(VirtIODevice *vdev, uint32_t n);
221 /* Saving and loading of a device; trying to deprecate save/load
222 * use vmsd for new devices.
223 */
224 void (*save)(VirtIODevice *vdev, QEMUFile *f);
225 int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
226 /* Post load hook in vmsd is called early while device is processed, and
227 * when VirtIODevice isn't fully initialized. Devices should use this instead,
228 * unless they specifically want to verify the migration stream as it's
229 * processed, e.g. for bounds checking.
230 */
231 int (*post_load)(VirtIODevice *vdev);
232 const VMStateDescription *vmsd;
233 bool (*primary_unplug_pending)(void *opaque);
234 /* May be called even when vdev->vhost_started is false */
235 struct vhost_dev *(*get_vhost)(VirtIODevice *vdev);
236 void (*toggle_device_iotlb)(VirtIODevice *vdev);
237 };
238
239 void virtio_instance_init_common(Object *proxy_obj, void *data,
240 size_t vdev_size, const char *vdev_name);
241
242 /**
243 * virtio_init() - initialise the common VirtIODevice structure
244 * @vdev: pointer to VirtIODevice
245 * @device_id: the VirtIO device ID (see virtio_ids.h)
246 * @config_size: size of the config space
247 */
248 void virtio_init(VirtIODevice *vdev, uint16_t device_id, size_t config_size);
249
250 void virtio_cleanup(VirtIODevice *vdev);
251
252 void virtio_error(VirtIODevice *vdev, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
253
254 /* Set the child bus name. */
255 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
256
257 typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *);
258
259 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
260 VirtIOHandleOutput handle_output);
261
262 void virtio_del_queue(VirtIODevice *vdev, int n);
263
264 void virtio_delete_queue(VirtQueue *vq);
265
266 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
267 unsigned int len);
268 void virtqueue_flush(VirtQueue *vq, unsigned int count);
269 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
270 unsigned int len);
271 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem,
272 unsigned int len);
273 bool virtqueue_rewind(VirtQueue *vq, unsigned int num);
274 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
275 unsigned int len, unsigned int idx);
276
277 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem);
278 void *virtqueue_pop(VirtQueue *vq, size_t sz);
279 unsigned int virtqueue_drop_all(VirtQueue *vq);
280 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
281 void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f,
282 VirtQueueElement *elem);
283 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
284 unsigned int out_bytes);
285 /**
286 * Return <0 on error or an opaque >=0 to pass to
287 * virtio_queue_enable_notification_and_check on success.
288 */
289 int virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
290 unsigned int *out_bytes, unsigned max_in_bytes,
291 unsigned max_out_bytes);
292
293 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
294 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
295
296 int virtio_save(VirtIODevice *vdev, QEMUFile *f);
297
298 extern const VMStateInfo virtio_vmstate_info;
299
300 #define VMSTATE_VIRTIO_DEVICE \
301 { \
302 .name = "virtio", \
303 .info = &virtio_vmstate_info, \
304 .flags = VMS_SINGLE, \
305 }
306
307 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
308
309 /**
310 * virtio_notify_config() - signal a change to device config
311 * @vdev: the virtio device
312 *
313 * Assuming the virtio device is up (VIRTIO_CONFIG_S_DRIVER_OK) this
314 * will trigger a guest interrupt and update the config version.
315 */
316 void virtio_notify_config(VirtIODevice *vdev);
317
318 bool virtio_queue_get_notification(VirtQueue *vq);
319 void virtio_queue_set_notification(VirtQueue *vq, int enable);
320
321 int virtio_queue_ready(VirtQueue *vq);
322
323 int virtio_queue_empty(VirtQueue *vq);
324
325 /**
326 * Enable notification and check whether guest has added some
327 * buffers since last call to virtqueue_get_avail_bytes.
328 *
329 * @opaque: value returned from virtqueue_get_avail_bytes
330 */
331 bool virtio_queue_enable_notification_and_check(VirtQueue *vq,
332 int opaque);
333
334 void virtio_queue_set_shadow_avail_idx(VirtQueue *vq, uint16_t idx);
335
336 /* Host binding interface. */
337
338 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
339 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
340 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
341 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
342 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
343 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
344 uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr);
345 uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr);
346 uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr);
347 void virtio_config_modern_writeb(VirtIODevice *vdev,
348 uint32_t addr, uint32_t data);
349 void virtio_config_modern_writew(VirtIODevice *vdev,
350 uint32_t addr, uint32_t data);
351 void virtio_config_modern_writel(VirtIODevice *vdev,
352 uint32_t addr, uint32_t data);
353 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
354 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
355 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
356 int virtio_queue_get_num(VirtIODevice *vdev, int n);
357 int virtio_queue_get_max_num(VirtIODevice *vdev, int n);
358 int virtio_get_num_queues(VirtIODevice *vdev);
359 void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
360 hwaddr avail, hwaddr used);
361 void virtio_queue_update_rings(VirtIODevice *vdev, int n);
362 void virtio_init_region_cache(VirtIODevice *vdev, int n);
363 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
364 void virtio_queue_notify(VirtIODevice *vdev, int n);
365 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
366 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
367 int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n,
368 MemoryRegion *mr, bool assign);
369 int virtio_set_status(VirtIODevice *vdev, uint8_t val);
370 void virtio_reset(void *opaque);
371 void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index);
372 void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index);
373 void virtio_update_irq(VirtIODevice *vdev);
374 int virtio_set_features(VirtIODevice *vdev, uint64_t val);
375
376 /* Base devices. */
377 typedef struct VirtIOBlkConf VirtIOBlkConf;
378 struct virtio_net_conf;
379 typedef struct virtio_serial_conf virtio_serial_conf;
380 typedef struct virtio_input_conf virtio_input_conf;
381 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
382 typedef struct VirtIORNGConf VirtIORNGConf;
383
384 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
385 DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
386 VIRTIO_RING_F_INDIRECT_DESC, true), \
387 DEFINE_PROP_BIT64("event_idx", _state, _field, \
388 VIRTIO_RING_F_EVENT_IDX, true), \
389 DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \
390 VIRTIO_F_NOTIFY_ON_EMPTY, true), \
391 DEFINE_PROP_BIT64("any_layout", _state, _field, \
392 VIRTIO_F_ANY_LAYOUT, true), \
393 DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
394 VIRTIO_F_IOMMU_PLATFORM, false), \
395 DEFINE_PROP_BIT64("packed", _state, _field, \
396 VIRTIO_F_RING_PACKED, false), \
397 DEFINE_PROP_BIT64("queue_reset", _state, _field, \
398 VIRTIO_F_RING_RESET, true), \
399 DEFINE_PROP_BIT64("in_order", _state, _field, \
400 VIRTIO_F_IN_ORDER, false)
401
402 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
403 bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n);
404 bool virtio_queue_enabled(VirtIODevice *vdev, int n);
405 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
406 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
407 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
408 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
409 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
410 unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
411 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n,
412 unsigned int idx);
413 void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
414 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
415 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
416 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
417 uint16_t virtio_get_queue_index(VirtQueue *vq);
418 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
419 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
420 bool with_irqfd);
421 int virtio_device_start_ioeventfd(VirtIODevice *vdev);
422 int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
423 void virtio_device_release_ioeventfd(VirtIODevice *vdev);
424 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
425 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
426 void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled);
427 void virtio_queue_host_notifier_read(EventNotifier *n);
428 void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx);
429 void virtio_queue_aio_attach_host_notifier_no_poll(VirtQueue *vq, AioContext *ctx);
430 void virtio_queue_aio_detach_host_notifier(VirtQueue *vq, AioContext *ctx);
431 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
432 VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
433 EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev);
434 void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
435 bool assign, bool with_irqfd);
436
virtio_add_feature(uint64_t * features,unsigned int fbit)437 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
438 {
439 assert(fbit < 64);
440 *features |= (1ULL << fbit);
441 }
442
virtio_clear_feature(uint64_t * features,unsigned int fbit)443 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
444 {
445 assert(fbit < 64);
446 *features &= ~(1ULL << fbit);
447 }
448
virtio_has_feature(uint64_t features,unsigned int fbit)449 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit)
450 {
451 assert(fbit < 64);
452 return !!(features & (1ULL << fbit));
453 }
454
virtio_vdev_has_feature(const VirtIODevice * vdev,unsigned int fbit)455 static inline bool virtio_vdev_has_feature(const VirtIODevice *vdev,
456 unsigned int fbit)
457 {
458 return virtio_has_feature(vdev->guest_features, fbit);
459 }
460
virtio_host_has_feature(VirtIODevice * vdev,unsigned int fbit)461 static inline bool virtio_host_has_feature(VirtIODevice *vdev,
462 unsigned int fbit)
463 {
464 return virtio_has_feature(vdev->host_features, fbit);
465 }
466
virtio_is_big_endian(VirtIODevice * vdev)467 static inline bool virtio_is_big_endian(VirtIODevice *vdev)
468 {
469 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
470 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
471 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
472 }
473 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
474 return false;
475 }
476
477 /**
478 * virtio_device_started() - check if device started
479 * @vdev - the VirtIO device
480 * @status - the devices status bits
481 *
482 * Check if the device is started. For most modern machines this is
483 * tracked via the @vdev->started field (to support migration),
484 * otherwise we check for the final negotiated status bit that
485 * indicates everything is ready.
486 */
virtio_device_started(VirtIODevice * vdev,uint8_t status)487 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status)
488 {
489 if (vdev->use_started) {
490 return vdev->started;
491 }
492
493 return status & VIRTIO_CONFIG_S_DRIVER_OK;
494 }
495
496 /**
497 * virtio_device_should_start() - check if device startable
498 * @vdev - the VirtIO device
499 * @status - the devices status bits
500 *
501 * This is similar to virtio_device_started() but ignores vdev->started
502 * and also encapsulates a check on the VM status which would prevent a
503 * device from starting anyway.
504 */
virtio_device_should_start(VirtIODevice * vdev,uint8_t status)505 static inline bool virtio_device_should_start(VirtIODevice *vdev, uint8_t status)
506 {
507 if (!vdev->vm_running) {
508 return false;
509 }
510
511 return status & VIRTIO_CONFIG_S_DRIVER_OK;
512 }
513
virtio_set_started(VirtIODevice * vdev,bool started)514 static inline void virtio_set_started(VirtIODevice *vdev, bool started)
515 {
516 if (started) {
517 vdev->start_on_kick = false;
518 }
519
520 if (vdev->use_started) {
521 vdev->started = started;
522 }
523 }
524
virtio_set_disabled(VirtIODevice * vdev,bool disable)525 static inline void virtio_set_disabled(VirtIODevice *vdev, bool disable)
526 {
527 if (vdev->use_disabled_flag) {
528 vdev->disabled = disable;
529 }
530 }
531
virtio_device_disabled(VirtIODevice * vdev)532 static inline bool virtio_device_disabled(VirtIODevice *vdev)
533 {
534 return unlikely(vdev->disabled || vdev->broken);
535 }
536
537 bool virtio_legacy_allowed(VirtIODevice *vdev);
538 bool virtio_legacy_check_disabled(VirtIODevice *vdev);
539
540 QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
541 QEMUBHFunc *cb, void *opaque,
542 const char *name);
543 #define virtio_bh_new_guarded(dev, cb, opaque) \
544 virtio_bh_new_guarded_full((dev), (cb), (opaque), (stringify(cb)))
545
546 #endif
547