4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
17 #include "exec/memory.h"
18 #include "hw/qdev-core.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"
26 /* A guest should never accept this. It implies negotiation is broken. */
27 #define VIRTIO_F_BAD_FEATURE 30
29 #define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \
30 (0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
31 (0x1ULL << VIRTIO_F_ANY_LAYOUT))
35 static inline hwaddr
vring_align(hwaddr addr
,
38 return QEMU_ALIGN_UP(addr
, align
);
41 typedef struct VirtIOFeature
{
46 size_t virtio_feature_get_config_size(const VirtIOFeature
*features
,
47 uint64_t host_features
);
49 typedef struct VirtQueue VirtQueue
;
51 #define VIRTQUEUE_MAX_SIZE 1024
53 typedef struct VirtQueueElement
66 #define VIRTIO_QUEUE_MAX 1024
68 #define VIRTIO_NO_VECTOR 0xffff
70 #define TYPE_VIRTIO_DEVICE "virtio-device"
71 OBJECT_DECLARE_TYPE(VirtIODevice
, VirtioDeviceClass
, VIRTIO_DEVICE
)
73 enum virtio_device_endian
{
74 VIRTIO_DEVICE_ENDIAN_UNKNOWN
,
75 VIRTIO_DEVICE_ENDIAN_LITTLE
,
76 VIRTIO_DEVICE_ENDIAN_BIG
,
81 DeviceState parent_obj
;
86 uint64_t guest_features
;
87 uint64_t host_features
;
88 uint64_t backend_features
;
91 uint16_t config_vector
;
95 MemoryListener listener
;
98 bool broken
; /* device in invalid state, needs reset */
99 bool use_disabled_flag
; /* allow use of 'disable' flag when needed */
100 bool disabled
; /* device in temporarily disabled state */
103 bool start_on_kick
; /* when virtio 1.0 feature has not been negotiated */
104 bool disable_legacy_check
;
105 VMChangeStateEntry
*vmstate
;
107 uint8_t device_endian
;
108 bool use_guest_notifier_mask
;
109 AddressSpace
*dma_as
;
110 QLIST_HEAD(, VirtQueue
) *vector_queues
;
113 struct VirtioDeviceClass
{
118 /* This is what a VirtioDevice must implement */
119 DeviceRealize realize
;
120 DeviceUnrealize unrealize
;
121 uint64_t (*get_features
)(VirtIODevice
*vdev
,
122 uint64_t requested_features
,
124 uint64_t (*bad_features
)(VirtIODevice
*vdev
);
125 void (*set_features
)(VirtIODevice
*vdev
, uint64_t val
);
126 int (*validate_features
)(VirtIODevice
*vdev
);
127 void (*get_config
)(VirtIODevice
*vdev
, uint8_t *config
);
128 void (*set_config
)(VirtIODevice
*vdev
, const uint8_t *config
);
129 void (*reset
)(VirtIODevice
*vdev
);
130 void (*set_status
)(VirtIODevice
*vdev
, uint8_t val
);
131 /* For transitional devices, this is a bitmap of features
132 * that are only exposed on the legacy interface but not
135 uint64_t legacy_features
;
136 /* Test and clear event pending status.
137 * Should be called after unmask to avoid losing events.
138 * If backend does not support masking,
139 * must check in frontend instead.
141 bool (*guest_notifier_pending
)(VirtIODevice
*vdev
, int n
);
142 /* Mask/unmask events from this vq. Any events reported
143 * while masked will become pending.
144 * If backend does not support masking,
145 * must mask in frontend instead.
147 void (*guest_notifier_mask
)(VirtIODevice
*vdev
, int n
, bool mask
);
148 int (*start_ioeventfd
)(VirtIODevice
*vdev
);
149 void (*stop_ioeventfd
)(VirtIODevice
*vdev
);
150 /* Saving and loading of a device; trying to deprecate save/load
151 * use vmsd for new devices.
153 void (*save
)(VirtIODevice
*vdev
, QEMUFile
*f
);
154 int (*load
)(VirtIODevice
*vdev
, QEMUFile
*f
, int version_id
);
155 /* Post load hook in vmsd is called early while device is processed, and
156 * when VirtIODevice isn't fully initialized. Devices should use this instead,
157 * unless they specifically want to verify the migration stream as it's
158 * processed, e.g. for bounds checking.
160 int (*post_load
)(VirtIODevice
*vdev
);
161 const VMStateDescription
*vmsd
;
162 bool (*primary_unplug_pending
)(void *opaque
);
165 void virtio_instance_init_common(Object
*proxy_obj
, void *data
,
166 size_t vdev_size
, const char *vdev_name
);
168 void virtio_init(VirtIODevice
*vdev
, const char *name
,
169 uint16_t device_id
, size_t config_size
);
170 void virtio_cleanup(VirtIODevice
*vdev
);
172 void virtio_error(VirtIODevice
*vdev
, const char *fmt
, ...) GCC_FMT_ATTR(2, 3);
174 /* Set the child bus name. */
175 void virtio_device_set_child_bus_name(VirtIODevice
*vdev
, char *bus_name
);
177 typedef void (*VirtIOHandleOutput
)(VirtIODevice
*, VirtQueue
*);
179 VirtQueue
*virtio_add_queue(VirtIODevice
*vdev
, int queue_size
,
180 VirtIOHandleOutput handle_output
);
182 void virtio_del_queue(VirtIODevice
*vdev
, int n
);
184 void virtio_delete_queue(VirtQueue
*vq
);
186 void virtqueue_push(VirtQueue
*vq
, const VirtQueueElement
*elem
,
188 void virtqueue_flush(VirtQueue
*vq
, unsigned int count
);
189 void virtqueue_detach_element(VirtQueue
*vq
, const VirtQueueElement
*elem
,
191 void virtqueue_unpop(VirtQueue
*vq
, const VirtQueueElement
*elem
,
193 bool virtqueue_rewind(VirtQueue
*vq
, unsigned int num
);
194 void virtqueue_fill(VirtQueue
*vq
, const VirtQueueElement
*elem
,
195 unsigned int len
, unsigned int idx
);
197 void virtqueue_map(VirtIODevice
*vdev
, VirtQueueElement
*elem
);
198 void *virtqueue_pop(VirtQueue
*vq
, size_t sz
);
199 unsigned int virtqueue_drop_all(VirtQueue
*vq
);
200 void *qemu_get_virtqueue_element(VirtIODevice
*vdev
, QEMUFile
*f
, size_t sz
);
201 void qemu_put_virtqueue_element(VirtIODevice
*vdev
, QEMUFile
*f
,
202 VirtQueueElement
*elem
);
203 int virtqueue_avail_bytes(VirtQueue
*vq
, unsigned int in_bytes
,
204 unsigned int out_bytes
);
205 void virtqueue_get_avail_bytes(VirtQueue
*vq
, unsigned int *in_bytes
,
206 unsigned int *out_bytes
,
207 unsigned max_in_bytes
, unsigned max_out_bytes
);
209 void virtio_notify_irqfd(VirtIODevice
*vdev
, VirtQueue
*vq
);
210 void virtio_notify(VirtIODevice
*vdev
, VirtQueue
*vq
);
212 int virtio_save(VirtIODevice
*vdev
, QEMUFile
*f
);
214 extern const VMStateInfo virtio_vmstate_info
;
216 #define VMSTATE_VIRTIO_DEVICE \
219 .info = &virtio_vmstate_info, \
220 .flags = VMS_SINGLE, \
223 int virtio_load(VirtIODevice
*vdev
, QEMUFile
*f
, int version_id
);
225 void virtio_notify_config(VirtIODevice
*vdev
);
227 bool virtio_queue_get_notification(VirtQueue
*vq
);
228 void virtio_queue_set_notification(VirtQueue
*vq
, int enable
);
230 int virtio_queue_ready(VirtQueue
*vq
);
232 int virtio_queue_empty(VirtQueue
*vq
);
234 /* Host binding interface. */
236 uint32_t virtio_config_readb(VirtIODevice
*vdev
, uint32_t addr
);
237 uint32_t virtio_config_readw(VirtIODevice
*vdev
, uint32_t addr
);
238 uint32_t virtio_config_readl(VirtIODevice
*vdev
, uint32_t addr
);
239 void virtio_config_writeb(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
);
240 void virtio_config_writew(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
);
241 void virtio_config_writel(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
);
242 uint32_t virtio_config_modern_readb(VirtIODevice
*vdev
, uint32_t addr
);
243 uint32_t virtio_config_modern_readw(VirtIODevice
*vdev
, uint32_t addr
);
244 uint32_t virtio_config_modern_readl(VirtIODevice
*vdev
, uint32_t addr
);
245 void virtio_config_modern_writeb(VirtIODevice
*vdev
,
246 uint32_t addr
, uint32_t data
);
247 void virtio_config_modern_writew(VirtIODevice
*vdev
,
248 uint32_t addr
, uint32_t data
);
249 void virtio_config_modern_writel(VirtIODevice
*vdev
,
250 uint32_t addr
, uint32_t data
);
251 void virtio_queue_set_addr(VirtIODevice
*vdev
, int n
, hwaddr addr
);
252 hwaddr
virtio_queue_get_addr(VirtIODevice
*vdev
, int n
);
253 void virtio_queue_set_num(VirtIODevice
*vdev
, int n
, int num
);
254 int virtio_queue_get_num(VirtIODevice
*vdev
, int n
);
255 int virtio_queue_get_max_num(VirtIODevice
*vdev
, int n
);
256 int virtio_get_num_queues(VirtIODevice
*vdev
);
257 void virtio_queue_set_rings(VirtIODevice
*vdev
, int n
, hwaddr desc
,
258 hwaddr avail
, hwaddr used
);
259 void virtio_queue_update_rings(VirtIODevice
*vdev
, int n
);
260 void virtio_queue_set_align(VirtIODevice
*vdev
, int n
, int align
);
261 void virtio_queue_notify(VirtIODevice
*vdev
, int n
);
262 uint16_t virtio_queue_vector(VirtIODevice
*vdev
, int n
);
263 void virtio_queue_set_vector(VirtIODevice
*vdev
, int n
, uint16_t vector
);
264 int virtio_queue_set_host_notifier_mr(VirtIODevice
*vdev
, int n
,
265 MemoryRegion
*mr
, bool assign
);
266 int virtio_set_status(VirtIODevice
*vdev
, uint8_t val
);
267 void virtio_reset(void *opaque
);
268 void virtio_update_irq(VirtIODevice
*vdev
);
269 int virtio_set_features(VirtIODevice
*vdev
, uint64_t val
);
272 typedef struct VirtIOBlkConf VirtIOBlkConf
;
273 struct virtio_net_conf
;
274 typedef struct virtio_serial_conf virtio_serial_conf
;
275 typedef struct virtio_input_conf virtio_input_conf
;
276 typedef struct VirtIOSCSIConf VirtIOSCSIConf
;
277 typedef struct VirtIORNGConf VirtIORNGConf
;
279 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
280 DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
281 VIRTIO_RING_F_INDIRECT_DESC, true), \
282 DEFINE_PROP_BIT64("event_idx", _state, _field, \
283 VIRTIO_RING_F_EVENT_IDX, true), \
284 DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \
285 VIRTIO_F_NOTIFY_ON_EMPTY, true), \
286 DEFINE_PROP_BIT64("any_layout", _state, _field, \
287 VIRTIO_F_ANY_LAYOUT, true), \
288 DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
289 VIRTIO_F_IOMMU_PLATFORM, false), \
290 DEFINE_PROP_BIT64("packed", _state, _field, \
291 VIRTIO_F_RING_PACKED, false)
293 hwaddr
virtio_queue_get_desc_addr(VirtIODevice
*vdev
, int n
);
294 bool virtio_queue_enabled_legacy(VirtIODevice
*vdev
, int n
);
295 bool virtio_queue_enabled(VirtIODevice
*vdev
, int n
);
296 hwaddr
virtio_queue_get_avail_addr(VirtIODevice
*vdev
, int n
);
297 hwaddr
virtio_queue_get_used_addr(VirtIODevice
*vdev
, int n
);
298 hwaddr
virtio_queue_get_desc_size(VirtIODevice
*vdev
, int n
);
299 hwaddr
virtio_queue_get_avail_size(VirtIODevice
*vdev
, int n
);
300 hwaddr
virtio_queue_get_used_size(VirtIODevice
*vdev
, int n
);
301 unsigned int virtio_queue_get_last_avail_idx(VirtIODevice
*vdev
, int n
);
302 void virtio_queue_set_last_avail_idx(VirtIODevice
*vdev
, int n
,
304 void virtio_queue_restore_last_avail_idx(VirtIODevice
*vdev
, int n
);
305 void virtio_queue_invalidate_signalled_used(VirtIODevice
*vdev
, int n
);
306 void virtio_queue_update_used_idx(VirtIODevice
*vdev
, int n
);
307 VirtQueue
*virtio_get_queue(VirtIODevice
*vdev
, int n
);
308 uint16_t virtio_get_queue_index(VirtQueue
*vq
);
309 EventNotifier
*virtio_queue_get_guest_notifier(VirtQueue
*vq
);
310 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue
*vq
, bool assign
,
312 int virtio_device_start_ioeventfd(VirtIODevice
*vdev
);
313 int virtio_device_grab_ioeventfd(VirtIODevice
*vdev
);
314 void virtio_device_release_ioeventfd(VirtIODevice
*vdev
);
315 bool virtio_device_ioeventfd_enabled(VirtIODevice
*vdev
);
316 EventNotifier
*virtio_queue_get_host_notifier(VirtQueue
*vq
);
317 void virtio_queue_set_host_notifier_enabled(VirtQueue
*vq
, bool enabled
);
318 void virtio_queue_host_notifier_read(EventNotifier
*n
);
319 void virtio_queue_aio_attach_host_notifier(VirtQueue
*vq
, AioContext
*ctx
);
320 void virtio_queue_aio_detach_host_notifier(VirtQueue
*vq
, AioContext
*ctx
);
321 VirtQueue
*virtio_vector_first_queue(VirtIODevice
*vdev
, uint16_t vector
);
322 VirtQueue
*virtio_vector_next_queue(VirtQueue
*vq
);
324 static inline void virtio_add_feature(uint64_t *features
, unsigned int fbit
)
327 *features
|= (1ULL << fbit
);
330 static inline void virtio_clear_feature(uint64_t *features
, unsigned int fbit
)
333 *features
&= ~(1ULL << fbit
);
336 static inline bool virtio_has_feature(uint64_t features
, unsigned int fbit
)
339 return !!(features
& (1ULL << fbit
));
342 static inline bool virtio_vdev_has_feature(VirtIODevice
*vdev
,
345 return virtio_has_feature(vdev
->guest_features
, fbit
);
348 static inline bool virtio_host_has_feature(VirtIODevice
*vdev
,
351 return virtio_has_feature(vdev
->host_features
, fbit
);
354 static inline bool virtio_is_big_endian(VirtIODevice
*vdev
)
356 if (!virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
357 assert(vdev
->device_endian
!= VIRTIO_DEVICE_ENDIAN_UNKNOWN
);
358 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_BIG
;
360 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
364 static inline bool virtio_device_started(VirtIODevice
*vdev
, uint8_t status
)
366 if (vdev
->use_started
) {
367 return vdev
->started
;
370 return status
& VIRTIO_CONFIG_S_DRIVER_OK
;
373 static inline void virtio_set_started(VirtIODevice
*vdev
, bool started
)
376 vdev
->start_on_kick
= false;
379 if (vdev
->use_started
) {
380 vdev
->started
= started
;
384 static inline void virtio_set_disabled(VirtIODevice
*vdev
, bool disable
)
386 if (vdev
->use_disabled_flag
) {
387 vdev
->disabled
= disable
;
391 static inline bool virtio_device_disabled(VirtIODevice
*vdev
)
393 return unlikely(vdev
->disabled
|| vdev
->broken
);
396 bool virtio_legacy_allowed(VirtIODevice
*vdev
);
397 bool virtio_legacy_check_disabled(VirtIODevice
*vdev
);