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 "exec/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 26 /* A guest should never accept this. It implies negotiation is broken. */ 27 #define VIRTIO_F_BAD_FEATURE 30 28 29 #define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \ 30 (0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \ 31 (0x1ULL << VIRTIO_F_ANY_LAYOUT)) 32 33 struct VirtQueue; 34 35 static inline hwaddr vring_align(hwaddr addr, 36 unsigned long align) 37 { 38 return QEMU_ALIGN_UP(addr, align); 39 } 40 41 typedef struct VirtIOFeature { 42 uint64_t flags; 43 size_t end; 44 } VirtIOFeature; 45 46 size_t virtio_feature_get_config_size(VirtIOFeature *features, 47 uint64_t host_features); 48 49 typedef struct VirtQueue VirtQueue; 50 51 #define VIRTQUEUE_MAX_SIZE 1024 52 53 typedef struct VirtQueueElement 54 { 55 unsigned int index; 56 unsigned int len; 57 unsigned int ndescs; 58 unsigned int out_num; 59 unsigned int in_num; 60 hwaddr *in_addr; 61 hwaddr *out_addr; 62 struct iovec *in_sg; 63 struct iovec *out_sg; 64 } VirtQueueElement; 65 66 #define VIRTIO_QUEUE_MAX 1024 67 68 #define VIRTIO_NO_VECTOR 0xffff 69 70 #define TYPE_VIRTIO_DEVICE "virtio-device" 71 OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE) 72 73 enum virtio_device_endian { 74 VIRTIO_DEVICE_ENDIAN_UNKNOWN, 75 VIRTIO_DEVICE_ENDIAN_LITTLE, 76 VIRTIO_DEVICE_ENDIAN_BIG, 77 }; 78 79 struct VirtIODevice 80 { 81 DeviceState parent_obj; 82 const char *name; 83 uint8_t status; 84 uint8_t isr; 85 uint16_t queue_sel; 86 uint64_t guest_features; 87 uint64_t host_features; 88 uint64_t backend_features; 89 size_t config_len; 90 void *config; 91 uint16_t config_vector; 92 uint32_t generation; 93 int nvectors; 94 VirtQueue *vq; 95 MemoryListener listener; 96 uint16_t device_id; 97 bool vm_running; 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 */ 101 bool use_started; 102 bool started; 103 bool start_on_kick; /* when virtio 1.0 feature has not been negotiated */ 104 VMChangeStateEntry *vmstate; 105 char *bus_name; 106 uint8_t device_endian; 107 bool use_guest_notifier_mask; 108 AddressSpace *dma_as; 109 QLIST_HEAD(, VirtQueue) *vector_queues; 110 }; 111 112 struct VirtioDeviceClass { 113 /*< private >*/ 114 DeviceClass parent; 115 /*< public >*/ 116 117 /* This is what a VirtioDevice must implement */ 118 DeviceRealize realize; 119 DeviceUnrealize unrealize; 120 uint64_t (*get_features)(VirtIODevice *vdev, 121 uint64_t requested_features, 122 Error **errp); 123 uint64_t (*bad_features)(VirtIODevice *vdev); 124 void (*set_features)(VirtIODevice *vdev, uint64_t val); 125 int (*validate_features)(VirtIODevice *vdev); 126 void (*get_config)(VirtIODevice *vdev, uint8_t *config); 127 void (*set_config)(VirtIODevice *vdev, const uint8_t *config); 128 void (*reset)(VirtIODevice *vdev); 129 void (*set_status)(VirtIODevice *vdev, uint8_t val); 130 /* For transitional devices, this is a bitmap of features 131 * that are only exposed on the legacy interface but not 132 * the modern one. 133 */ 134 uint64_t legacy_features; 135 /* Test and clear event pending status. 136 * Should be called after unmask to avoid losing events. 137 * If backend does not support masking, 138 * must check in frontend instead. 139 */ 140 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 141 /* Mask/unmask events from this vq. Any events reported 142 * while masked will become pending. 143 * If backend does not support masking, 144 * must mask in frontend instead. 145 */ 146 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); 147 int (*start_ioeventfd)(VirtIODevice *vdev); 148 void (*stop_ioeventfd)(VirtIODevice *vdev); 149 /* Saving and loading of a device; trying to deprecate save/load 150 * use vmsd for new devices. 151 */ 152 void (*save)(VirtIODevice *vdev, QEMUFile *f); 153 int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id); 154 /* Post load hook in vmsd is called early while device is processed, and 155 * when VirtIODevice isn't fully initialized. Devices should use this instead, 156 * unless they specifically want to verify the migration stream as it's 157 * processed, e.g. for bounds checking. 158 */ 159 int (*post_load)(VirtIODevice *vdev); 160 const VMStateDescription *vmsd; 161 bool (*primary_unplug_pending)(void *opaque); 162 }; 163 164 void virtio_instance_init_common(Object *proxy_obj, void *data, 165 size_t vdev_size, const char *vdev_name); 166 167 void virtio_init(VirtIODevice *vdev, const char *name, 168 uint16_t device_id, size_t config_size); 169 void virtio_cleanup(VirtIODevice *vdev); 170 171 void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3); 172 173 /* Set the child bus name. */ 174 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); 175 176 typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *); 177 typedef bool (*VirtIOHandleAIOOutput)(VirtIODevice *, VirtQueue *); 178 179 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, 180 VirtIOHandleOutput handle_output); 181 182 void virtio_del_queue(VirtIODevice *vdev, int n); 183 184 void virtio_delete_queue(VirtQueue *vq); 185 186 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, 187 unsigned int len); 188 void virtqueue_flush(VirtQueue *vq, unsigned int count); 189 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, 190 unsigned int len); 191 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, 192 unsigned int len); 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); 196 197 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); 208 209 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq); 210 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); 211 212 int virtio_save(VirtIODevice *vdev, QEMUFile *f); 213 214 extern const VMStateInfo virtio_vmstate_info; 215 216 #define VMSTATE_VIRTIO_DEVICE \ 217 { \ 218 .name = "virtio", \ 219 .info = &virtio_vmstate_info, \ 220 .flags = VMS_SINGLE, \ 221 } 222 223 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); 224 225 void virtio_notify_config(VirtIODevice *vdev); 226 227 bool virtio_queue_get_notification(VirtQueue *vq); 228 void virtio_queue_set_notification(VirtQueue *vq, int enable); 229 230 int virtio_queue_ready(VirtQueue *vq); 231 232 int virtio_queue_empty(VirtQueue *vq); 233 234 /* Host binding interface. */ 235 236 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); 270 271 /* Base devices. */ 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; 278 279 #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) 292 293 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, 303 unsigned int idx); 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, 311 bool with_irqfd); 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_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, 320 VirtIOHandleAIOOutput handle_output); 321 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); 322 VirtQueue *virtio_vector_next_queue(VirtQueue *vq); 323 324 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit) 325 { 326 assert(fbit < 64); 327 *features |= (1ULL << fbit); 328 } 329 330 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit) 331 { 332 assert(fbit < 64); 333 *features &= ~(1ULL << fbit); 334 } 335 336 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit) 337 { 338 assert(fbit < 64); 339 return !!(features & (1ULL << fbit)); 340 } 341 342 static inline bool virtio_vdev_has_feature(VirtIODevice *vdev, 343 unsigned int fbit) 344 { 345 return virtio_has_feature(vdev->guest_features, fbit); 346 } 347 348 static inline bool virtio_host_has_feature(VirtIODevice *vdev, 349 unsigned int fbit) 350 { 351 return virtio_has_feature(vdev->host_features, fbit); 352 } 353 354 static inline bool virtio_is_big_endian(VirtIODevice *vdev) 355 { 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; 359 } 360 /* Devices conforming to VIRTIO 1.0 or later are always LE. */ 361 return false; 362 } 363 364 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status) 365 { 366 if (vdev->use_started) { 367 return vdev->started; 368 } 369 370 return status & VIRTIO_CONFIG_S_DRIVER_OK; 371 } 372 373 static inline void virtio_set_started(VirtIODevice *vdev, bool started) 374 { 375 if (started) { 376 vdev->start_on_kick = false; 377 } 378 379 if (vdev->use_started) { 380 vdev->started = started; 381 } 382 } 383 384 static inline void virtio_set_disabled(VirtIODevice *vdev, bool disable) 385 { 386 if (vdev->use_disabled_flag) { 387 vdev->disabled = disable; 388 } 389 } 390 391 static inline bool virtio_device_disabled(VirtIODevice *vdev) 392 { 393 return unlikely(vdev->disabled || vdev->broken); 394 } 395 396 bool virtio_legacy_allowed(VirtIODevice *vdev); 397 398 #endif 399