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 "hw/hw.h" 18 #include "net/net.h" 19 #include "hw/qdev.h" 20 #include "sysemu/sysemu.h" 21 #include "qemu/event_notifier.h" 22 #include "standard-headers/linux/virtio_config.h" 23 #include "standard-headers/linux/virtio_ring.h" 24 25 /* A guest should never accept this. It implies negotiation is broken. */ 26 #define VIRTIO_F_BAD_FEATURE 30 27 28 #define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \ 29 (0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \ 30 (0x1ULL << VIRTIO_F_ANY_LAYOUT)) 31 32 struct VirtQueue; 33 34 static inline hwaddr vring_align(hwaddr addr, 35 unsigned long align) 36 { 37 return QEMU_ALIGN_UP(addr, align); 38 } 39 40 /* 41 * Calculate the number of bytes up to and including the given 'field' of 42 * 'container'. 43 */ 44 #define virtio_endof(container, field) \ 45 (offsetof(container, field) + sizeof_field(container, field)) 46 47 typedef struct VirtIOFeature { 48 uint64_t flags; 49 size_t end; 50 } VirtIOFeature; 51 52 size_t virtio_feature_get_config_size(VirtIOFeature *features, 53 uint64_t host_features); 54 55 typedef struct VirtQueue VirtQueue; 56 57 #define VIRTQUEUE_MAX_SIZE 1024 58 59 typedef struct VirtQueueElement 60 { 61 unsigned int index; 62 unsigned int out_num; 63 unsigned int in_num; 64 hwaddr *in_addr; 65 hwaddr *out_addr; 66 struct iovec *in_sg; 67 struct iovec *out_sg; 68 } VirtQueueElement; 69 70 #define VIRTIO_QUEUE_MAX 1024 71 72 #define VIRTIO_NO_VECTOR 0xffff 73 74 #define TYPE_VIRTIO_DEVICE "virtio-device" 75 #define VIRTIO_DEVICE_GET_CLASS(obj) \ 76 OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE) 77 #define VIRTIO_DEVICE_CLASS(klass) \ 78 OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE) 79 #define VIRTIO_DEVICE(obj) \ 80 OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE) 81 82 enum virtio_device_endian { 83 VIRTIO_DEVICE_ENDIAN_UNKNOWN, 84 VIRTIO_DEVICE_ENDIAN_LITTLE, 85 VIRTIO_DEVICE_ENDIAN_BIG, 86 }; 87 88 struct VirtIODevice 89 { 90 DeviceState parent_obj; 91 const char *name; 92 uint8_t status; 93 uint8_t isr; 94 uint16_t queue_sel; 95 uint64_t guest_features; 96 uint64_t host_features; 97 uint64_t backend_features; 98 size_t config_len; 99 void *config; 100 uint16_t config_vector; 101 uint32_t generation; 102 int nvectors; 103 VirtQueue *vq; 104 MemoryListener listener; 105 uint16_t device_id; 106 bool vm_running; 107 bool broken; /* device in invalid state, needs reset */ 108 bool use_started; 109 bool started; 110 bool start_on_kick; /* when virtio 1.0 feature has not been negotiated */ 111 VMChangeStateEntry *vmstate; 112 char *bus_name; 113 uint8_t device_endian; 114 bool use_guest_notifier_mask; 115 AddressSpace *dma_as; 116 QLIST_HEAD(, VirtQueue) *vector_queues; 117 }; 118 119 typedef struct VirtioDeviceClass { 120 /*< private >*/ 121 DeviceClass parent; 122 /*< public >*/ 123 124 /* This is what a VirtioDevice must implement */ 125 DeviceRealize realize; 126 DeviceUnrealize unrealize; 127 uint64_t (*get_features)(VirtIODevice *vdev, 128 uint64_t requested_features, 129 Error **errp); 130 uint64_t (*bad_features)(VirtIODevice *vdev); 131 void (*set_features)(VirtIODevice *vdev, uint64_t val); 132 int (*validate_features)(VirtIODevice *vdev); 133 void (*get_config)(VirtIODevice *vdev, uint8_t *config); 134 void (*set_config)(VirtIODevice *vdev, const uint8_t *config); 135 void (*reset)(VirtIODevice *vdev); 136 void (*set_status)(VirtIODevice *vdev, uint8_t val); 137 /* For transitional devices, this is a bitmap of features 138 * that are only exposed on the legacy interface but not 139 * the modern one. 140 */ 141 uint64_t legacy_features; 142 /* Test and clear event pending status. 143 * Should be called after unmask to avoid losing events. 144 * If backend does not support masking, 145 * must check in frontend instead. 146 */ 147 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 148 /* Mask/unmask events from this vq. Any events reported 149 * while masked will become pending. 150 * If backend does not support masking, 151 * must mask in frontend instead. 152 */ 153 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); 154 int (*start_ioeventfd)(VirtIODevice *vdev); 155 void (*stop_ioeventfd)(VirtIODevice *vdev); 156 /* Saving and loading of a device; trying to deprecate save/load 157 * use vmsd for new devices. 158 */ 159 void (*save)(VirtIODevice *vdev, QEMUFile *f); 160 int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id); 161 const VMStateDescription *vmsd; 162 } VirtioDeviceClass; 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 virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, 185 unsigned int len); 186 void virtqueue_flush(VirtQueue *vq, unsigned int count); 187 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem, 188 unsigned int len); 189 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem, 190 unsigned int len); 191 bool virtqueue_rewind(VirtQueue *vq, unsigned int num); 192 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, 193 unsigned int len, unsigned int idx); 194 195 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem); 196 void *virtqueue_pop(VirtQueue *vq, size_t sz); 197 unsigned int virtqueue_drop_all(VirtQueue *vq); 198 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz); 199 void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem); 200 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, 201 unsigned int out_bytes); 202 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, 203 unsigned int *out_bytes, 204 unsigned max_in_bytes, unsigned max_out_bytes); 205 206 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq); 207 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); 208 209 int virtio_save(VirtIODevice *vdev, QEMUFile *f); 210 211 extern const VMStateInfo virtio_vmstate_info; 212 213 #define VMSTATE_VIRTIO_DEVICE \ 214 { \ 215 .name = "virtio", \ 216 .info = &virtio_vmstate_info, \ 217 .flags = VMS_SINGLE, \ 218 } 219 220 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); 221 222 void virtio_notify_config(VirtIODevice *vdev); 223 224 void virtio_queue_set_notification(VirtQueue *vq, int enable); 225 226 int virtio_queue_ready(VirtQueue *vq); 227 228 int virtio_queue_empty(VirtQueue *vq); 229 230 /* Host binding interface. */ 231 232 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); 233 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); 234 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); 235 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); 236 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); 237 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); 238 uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr); 239 uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr); 240 uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr); 241 void virtio_config_modern_writeb(VirtIODevice *vdev, 242 uint32_t addr, uint32_t data); 243 void virtio_config_modern_writew(VirtIODevice *vdev, 244 uint32_t addr, uint32_t data); 245 void virtio_config_modern_writel(VirtIODevice *vdev, 246 uint32_t addr, uint32_t data); 247 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); 248 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); 249 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); 250 int virtio_queue_get_num(VirtIODevice *vdev, int n); 251 int virtio_queue_get_max_num(VirtIODevice *vdev, int n); 252 int virtio_get_num_queues(VirtIODevice *vdev); 253 void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, 254 hwaddr avail, hwaddr used); 255 void virtio_queue_update_rings(VirtIODevice *vdev, int n); 256 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align); 257 void virtio_queue_notify(VirtIODevice *vdev, int n); 258 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); 259 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); 260 int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n, 261 MemoryRegion *mr, bool assign); 262 int virtio_set_status(VirtIODevice *vdev, uint8_t val); 263 void virtio_reset(void *opaque); 264 void virtio_update_irq(VirtIODevice *vdev); 265 int virtio_set_features(VirtIODevice *vdev, uint64_t val); 266 267 /* Base devices. */ 268 typedef struct VirtIOBlkConf VirtIOBlkConf; 269 struct virtio_net_conf; 270 typedef struct virtio_serial_conf virtio_serial_conf; 271 typedef struct virtio_input_conf virtio_input_conf; 272 typedef struct VirtIOSCSIConf VirtIOSCSIConf; 273 typedef struct VirtIORNGConf VirtIORNGConf; 274 275 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ 276 DEFINE_PROP_BIT64("indirect_desc", _state, _field, \ 277 VIRTIO_RING_F_INDIRECT_DESC, true), \ 278 DEFINE_PROP_BIT64("event_idx", _state, _field, \ 279 VIRTIO_RING_F_EVENT_IDX, true), \ 280 DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \ 281 VIRTIO_F_NOTIFY_ON_EMPTY, true), \ 282 DEFINE_PROP_BIT64("any_layout", _state, _field, \ 283 VIRTIO_F_ANY_LAYOUT, true), \ 284 DEFINE_PROP_BIT64("iommu_platform", _state, _field, \ 285 VIRTIO_F_IOMMU_PLATFORM, false) 286 287 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); 288 bool virtio_queue_enabled(VirtIODevice *vdev, int n); 289 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); 290 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); 291 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); 292 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); 293 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); 294 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); 295 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); 296 void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n); 297 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n); 298 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n); 299 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); 300 uint16_t virtio_get_queue_index(VirtQueue *vq); 301 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); 302 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, 303 bool with_irqfd); 304 int virtio_device_start_ioeventfd(VirtIODevice *vdev); 305 void virtio_device_stop_ioeventfd(VirtIODevice *vdev); 306 int virtio_device_grab_ioeventfd(VirtIODevice *vdev); 307 void virtio_device_release_ioeventfd(VirtIODevice *vdev); 308 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev); 309 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); 310 void virtio_queue_host_notifier_read(EventNotifier *n); 311 void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx, 312 VirtIOHandleAIOOutput handle_output); 313 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); 314 VirtQueue *virtio_vector_next_queue(VirtQueue *vq); 315 316 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit) 317 { 318 assert(fbit < 64); 319 *features |= (1ULL << fbit); 320 } 321 322 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit) 323 { 324 assert(fbit < 64); 325 *features &= ~(1ULL << fbit); 326 } 327 328 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit) 329 { 330 assert(fbit < 64); 331 return !!(features & (1ULL << fbit)); 332 } 333 334 static inline bool virtio_vdev_has_feature(VirtIODevice *vdev, 335 unsigned int fbit) 336 { 337 return virtio_has_feature(vdev->guest_features, fbit); 338 } 339 340 static inline bool virtio_host_has_feature(VirtIODevice *vdev, 341 unsigned int fbit) 342 { 343 return virtio_has_feature(vdev->host_features, fbit); 344 } 345 346 static inline bool virtio_is_big_endian(VirtIODevice *vdev) 347 { 348 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 349 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN); 350 return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG; 351 } 352 /* Devices conforming to VIRTIO 1.0 or later are always LE. */ 353 return false; 354 } 355 356 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status) 357 { 358 if (vdev->use_started) { 359 return vdev->started; 360 } 361 362 return status & VIRTIO_CONFIG_S_DRIVER_OK; 363 } 364 365 static inline void virtio_set_started(VirtIODevice *vdev, bool started) 366 { 367 if (started) { 368 vdev->start_on_kick = false; 369 } 370 371 if (vdev->use_started) { 372 vdev->started = started; 373 } 374 } 375 #endif 376