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 #include "hw/virtio/vhost.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 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 hwaddr *in_addr; 73 hwaddr *out_addr; 74 struct iovec *in_sg; 75 struct iovec *out_sg; 76 } VirtQueueElement; 77 78 #define VIRTIO_QUEUE_MAX 1024 79 80 #define VIRTIO_NO_VECTOR 0xffff 81 82 #define TYPE_VIRTIO_DEVICE "virtio-device" 83 OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE) 84 85 enum virtio_device_endian { 86 VIRTIO_DEVICE_ENDIAN_UNKNOWN, 87 VIRTIO_DEVICE_ENDIAN_LITTLE, 88 VIRTIO_DEVICE_ENDIAN_BIG, 89 }; 90 91 struct VirtIODevice 92 { 93 DeviceState parent_obj; 94 const char *name; 95 uint8_t status; 96 uint8_t isr; 97 uint16_t queue_sel; 98 uint64_t guest_features; 99 uint64_t host_features; 100 uint64_t backend_features; 101 size_t config_len; 102 void *config; 103 uint16_t config_vector; 104 uint32_t generation; 105 int nvectors; 106 VirtQueue *vq; 107 MemoryListener listener; 108 uint16_t device_id; 109 /* @vm_running: current VM running state via virtio_vmstate_change() */ 110 bool vm_running; 111 bool broken; /* device in invalid state, needs reset */ 112 bool use_disabled_flag; /* allow use of 'disable' flag when needed */ 113 bool disabled; /* device in temporarily disabled state */ 114 bool use_started; 115 bool started; 116 bool start_on_kick; /* when virtio 1.0 feature has not been negotiated */ 117 bool disable_legacy_check; 118 bool vhost_started; 119 VMChangeStateEntry *vmstate; 120 char *bus_name; 121 uint8_t device_endian; 122 bool use_guest_notifier_mask; 123 AddressSpace *dma_as; 124 QLIST_HEAD(, VirtQueue) *vector_queues; 125 }; 126 127 struct VirtioDeviceClass { 128 /*< private >*/ 129 DeviceClass parent; 130 /*< public >*/ 131 132 /* This is what a VirtioDevice must implement */ 133 DeviceRealize realize; 134 DeviceUnrealize unrealize; 135 uint64_t (*get_features)(VirtIODevice *vdev, 136 uint64_t requested_features, 137 Error **errp); 138 uint64_t (*bad_features)(VirtIODevice *vdev); 139 void (*set_features)(VirtIODevice *vdev, uint64_t val); 140 int (*validate_features)(VirtIODevice *vdev); 141 void (*get_config)(VirtIODevice *vdev, uint8_t *config); 142 void (*set_config)(VirtIODevice *vdev, const uint8_t *config); 143 void (*reset)(VirtIODevice *vdev); 144 void (*set_status)(VirtIODevice *vdev, uint8_t val); 145 /* For transitional devices, this is a bitmap of features 146 * that are only exposed on the legacy interface but not 147 * the modern one. 148 */ 149 uint64_t legacy_features; 150 /* Test and clear event pending status. 151 * Should be called after unmask to avoid losing events. 152 * If backend does not support masking, 153 * must check in frontend instead. 154 */ 155 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 156 /* Mask/unmask events from this vq. Any events reported 157 * while masked will become pending. 158 * If backend does not support masking, 159 * must mask in frontend instead. 160 */ 161 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); 162 int (*start_ioeventfd)(VirtIODevice *vdev); 163 void (*stop_ioeventfd)(VirtIODevice *vdev); 164 /* Saving and loading of a device; trying to deprecate save/load 165 * use vmsd for new devices. 166 */ 167 void (*save)(VirtIODevice *vdev, QEMUFile *f); 168 int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id); 169 /* Post load hook in vmsd is called early while device is processed, and 170 * when VirtIODevice isn't fully initialized. Devices should use this instead, 171 * unless they specifically want to verify the migration stream as it's 172 * processed, e.g. for bounds checking. 173 */ 174 int (*post_load)(VirtIODevice *vdev); 175 const VMStateDescription *vmsd; 176 bool (*primary_unplug_pending)(void *opaque); 177 struct vhost_dev *(*get_vhost)(VirtIODevice *vdev); 178 }; 179 180 void virtio_instance_init_common(Object *proxy_obj, void *data, 181 size_t vdev_size, const char *vdev_name); 182 183 void virtio_init(VirtIODevice *vdev, uint16_t device_id, size_t config_size); 184 185 void virtio_cleanup(VirtIODevice *vdev); 186 187 void virtio_error(VirtIODevice *vdev, const char *fmt, ...) G_GNUC_PRINTF(2, 3); 188 189 /* Set the child bus name. */ 190 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); 191 192 typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *); 193 194 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, 195 VirtIOHandleOutput handle_output); 196 197 void virtio_del_queue(VirtIODevice *vdev, int n); 198 199 void virtio_delete_queue(VirtQueue *vq); 200 201 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, 202 unsigned int len); 203 void virtqueue_flush(VirtQueue *vq, unsigned int count); 204 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, 205 unsigned int len); 206 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, 207 unsigned int len); 208 bool virtqueue_rewind(VirtQueue *vq, unsigned int num); 209 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, 210 unsigned int len, unsigned int idx); 211 212 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem); 213 void *virtqueue_pop(VirtQueue *vq, size_t sz); 214 unsigned int virtqueue_drop_all(VirtQueue *vq); 215 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz); 216 void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, 217 VirtQueueElement *elem); 218 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, 219 unsigned int out_bytes); 220 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, 221 unsigned int *out_bytes, 222 unsigned max_in_bytes, unsigned max_out_bytes); 223 224 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq); 225 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); 226 227 int virtio_save(VirtIODevice *vdev, QEMUFile *f); 228 229 extern const VMStateInfo virtio_vmstate_info; 230 231 #define VMSTATE_VIRTIO_DEVICE \ 232 { \ 233 .name = "virtio", \ 234 .info = &virtio_vmstate_info, \ 235 .flags = VMS_SINGLE, \ 236 } 237 238 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); 239 240 void virtio_notify_config(VirtIODevice *vdev); 241 242 bool virtio_queue_get_notification(VirtQueue *vq); 243 void virtio_queue_set_notification(VirtQueue *vq, int enable); 244 245 int virtio_queue_ready(VirtQueue *vq); 246 247 int virtio_queue_empty(VirtQueue *vq); 248 249 /* Host binding interface. */ 250 251 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); 252 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); 253 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); 254 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); 255 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); 256 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); 257 uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr); 258 uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr); 259 uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr); 260 void virtio_config_modern_writeb(VirtIODevice *vdev, 261 uint32_t addr, uint32_t data); 262 void virtio_config_modern_writew(VirtIODevice *vdev, 263 uint32_t addr, uint32_t data); 264 void virtio_config_modern_writel(VirtIODevice *vdev, 265 uint32_t addr, uint32_t data); 266 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); 267 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); 268 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); 269 int virtio_queue_get_num(VirtIODevice *vdev, int n); 270 int virtio_queue_get_max_num(VirtIODevice *vdev, int n); 271 int virtio_get_num_queues(VirtIODevice *vdev); 272 void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, 273 hwaddr avail, hwaddr used); 274 void virtio_queue_update_rings(VirtIODevice *vdev, int n); 275 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align); 276 void virtio_queue_notify(VirtIODevice *vdev, int n); 277 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); 278 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); 279 int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, 280 MemoryRegion *mr, bool assign); 281 int virtio_set_status(VirtIODevice *vdev, uint8_t val); 282 void virtio_reset(void *opaque); 283 void virtio_update_irq(VirtIODevice *vdev); 284 int virtio_set_features(VirtIODevice *vdev, uint64_t val); 285 286 /* Base devices. */ 287 typedef struct VirtIOBlkConf VirtIOBlkConf; 288 struct virtio_net_conf; 289 typedef struct virtio_serial_conf virtio_serial_conf; 290 typedef struct virtio_input_conf virtio_input_conf; 291 typedef struct VirtIOSCSIConf VirtIOSCSIConf; 292 typedef struct VirtIORNGConf VirtIORNGConf; 293 294 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ 295 DEFINE_PROP_BIT64("indirect_desc", _state, _field, \ 296 VIRTIO_RING_F_INDIRECT_DESC, true), \ 297 DEFINE_PROP_BIT64("event_idx", _state, _field, \ 298 VIRTIO_RING_F_EVENT_IDX, true), \ 299 DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \ 300 VIRTIO_F_NOTIFY_ON_EMPTY, true), \ 301 DEFINE_PROP_BIT64("any_layout", _state, _field, \ 302 VIRTIO_F_ANY_LAYOUT, true), \ 303 DEFINE_PROP_BIT64("iommu_platform", _state, _field, \ 304 VIRTIO_F_IOMMU_PLATFORM, false), \ 305 DEFINE_PROP_BIT64("packed", _state, _field, \ 306 VIRTIO_F_RING_PACKED, false) 307 308 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); 309 bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n); 310 bool virtio_queue_enabled(VirtIODevice *vdev, int n); 311 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); 312 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); 313 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); 314 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); 315 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); 316 unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); 317 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, 318 unsigned int idx); 319 void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n); 320 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n); 321 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n); 322 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); 323 uint16_t virtio_get_queue_index(VirtQueue *vq); 324 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); 325 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, 326 bool with_irqfd); 327 int virtio_device_start_ioeventfd(VirtIODevice *vdev); 328 int virtio_device_grab_ioeventfd(VirtIODevice *vdev); 329 void virtio_device_release_ioeventfd(VirtIODevice *vdev); 330 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev); 331 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); 332 void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled); 333 void virtio_queue_host_notifier_read(EventNotifier *n); 334 void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx); 335 void virtio_queue_aio_attach_host_notifier_no_poll(VirtQueue *vq, AioContext *ctx); 336 void virtio_queue_aio_detach_host_notifier(VirtQueue *vq, AioContext *ctx); 337 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); 338 VirtQueue *virtio_vector_next_queue(VirtQueue *vq); 339 340 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit) 341 { 342 assert(fbit < 64); 343 *features |= (1ULL << fbit); 344 } 345 346 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit) 347 { 348 assert(fbit < 64); 349 *features &= ~(1ULL << fbit); 350 } 351 352 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit) 353 { 354 assert(fbit < 64); 355 return !!(features & (1ULL << fbit)); 356 } 357 358 static inline bool virtio_vdev_has_feature(VirtIODevice *vdev, 359 unsigned int fbit) 360 { 361 return virtio_has_feature(vdev->guest_features, fbit); 362 } 363 364 static inline bool virtio_host_has_feature(VirtIODevice *vdev, 365 unsigned int fbit) 366 { 367 return virtio_has_feature(vdev->host_features, fbit); 368 } 369 370 static inline bool virtio_is_big_endian(VirtIODevice *vdev) 371 { 372 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 373 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); 374 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; 375 } 376 /* Devices conforming to VIRTIO 1.0 or later are always LE. */ 377 return false; 378 } 379 380 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status) 381 { 382 if (vdev->use_started) { 383 return vdev->started; 384 } 385 386 if (!vdev->vm_running) { 387 return false; 388 } 389 390 return status & VIRTIO_CONFIG_S_DRIVER_OK; 391 } 392 393 static inline void virtio_set_started(VirtIODevice *vdev, bool started) 394 { 395 if (started) { 396 vdev->start_on_kick = false; 397 } 398 399 if (vdev->use_started) { 400 vdev->started = started; 401 } 402 } 403 404 static inline void virtio_set_disabled(VirtIODevice *vdev, bool disable) 405 { 406 if (vdev->use_disabled_flag) { 407 vdev->disabled = disable; 408 } 409 } 410 411 static inline bool virtio_device_disabled(VirtIODevice *vdev) 412 { 413 return unlikely(vdev->disabled || vdev->broken); 414 } 415 416 bool virtio_legacy_allowed(VirtIODevice *vdev); 417 bool virtio_legacy_check_disabled(VirtIODevice *vdev); 418 419 #endif 420