include/hw/virtio/virtio.h

   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     bool disable_legacy_check;
 105     VMChangeStateEntry *vmstate;
 106     char *bus_name;
 107     uint8_t device_endian;
 108     bool use_guest_notifier_mask;
 109     AddressSpace *dma_as;
 110     QLIST_HEAD(, VirtQueue) *vector_queues;
 111 };
 112
 113 struct VirtioDeviceClass {
 114     /*< private >*/
 115     DeviceClass parent;
 116     /*< public >*/
 117
 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,
 123                              Error **errp);
 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
 133      * the modern one.
 134      */
 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.
 140      */
 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.
 146      */
 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.
 152      */
 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.
 159      */
 160     int (*post_load)(VirtIODevice *vdev);
 161     const VMStateDescription *vmsd;
 162     bool (*primary_unplug_pending)(void *opaque);
 163 };
 164
 165 void virtio_instance_init_common(Object *proxy_obj, void *data,
 166                                  size_t vdev_size, const char *vdev_name);
 167
 168 void virtio_init(VirtIODevice *vdev, const char *name,
 169                          uint16_t device_id, size_t config_size);
 170 void virtio_cleanup(VirtIODevice *vdev);
 171
 172 void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
 173
 174 /* Set the child bus name. */
 175 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
 176
 177 typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *);
 178 typedef bool (*VirtIOHandleAIOOutput)(VirtIODevice *, VirtQueue *);
 179
 180 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 181                             VirtIOHandleOutput handle_output);
 182
 183 void virtio_del_queue(VirtIODevice *vdev, int n);
 184
 185 void virtio_delete_queue(VirtQueue *vq);
 186
 187 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
 188                     unsigned int len);
 189 void virtqueue_flush(VirtQueue *vq, unsigned int count);
 190 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
 191                               unsigned int len);
 192 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem,
 193                      unsigned int len);
 194 bool virtqueue_rewind(VirtQueue *vq, unsigned int num);
 195 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 196                     unsigned int len, unsigned int idx);
 197
 198 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem);
 199 void *virtqueue_pop(VirtQueue *vq, size_t sz);
 200 unsigned int virtqueue_drop_all(VirtQueue *vq);
 201 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
 202 void qemu_put_virtqueue_element(VirtIODevice *vdev, QEMUFile *f,
 203                                 VirtQueueElement *elem);
 204 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
 205                           unsigned int out_bytes);
 206 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
 207                                unsigned int *out_bytes,
 208                                unsigned max_in_bytes, unsigned max_out_bytes);
 209
 210 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
 211 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 212
 213 int virtio_save(VirtIODevice *vdev, QEMUFile *f);
 214
 215 extern const VMStateInfo virtio_vmstate_info;
 216
 217 #define VMSTATE_VIRTIO_DEVICE \
 218     {                                         \
 219         .name = "virtio",                     \
 220         .info = &virtio_vmstate_info,         \
 221         .flags = VMS_SINGLE,                  \
 222     }
 223
 224 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
 225
 226 void virtio_notify_config(VirtIODevice *vdev);
 227
 228 bool virtio_queue_get_notification(VirtQueue *vq);
 229 void virtio_queue_set_notification(VirtQueue *vq, int enable);
 230
 231 int virtio_queue_ready(VirtQueue *vq);
 232
 233 int virtio_queue_empty(VirtQueue *vq);
 234
 235 /* Host binding interface.  */
 236
 237 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
 238 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
 239 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
 240 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 241 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 242 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 243 uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr);
 244 uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr);
 245 uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr);
 246 void virtio_config_modern_writeb(VirtIODevice *vdev,
 247                                  uint32_t addr, uint32_t data);
 248 void virtio_config_modern_writew(VirtIODevice *vdev,
 249                                  uint32_t addr, uint32_t data);
 250 void virtio_config_modern_writel(VirtIODevice *vdev,
 251                                  uint32_t addr, uint32_t data);
 252 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
 253 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
 254 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
 255 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 256 int virtio_queue_get_max_num(VirtIODevice *vdev, int n);
 257 int virtio_get_num_queues(VirtIODevice *vdev);
 258 void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
 259                             hwaddr avail, hwaddr used);
 260 void virtio_queue_update_rings(VirtIODevice *vdev, int n);
 261 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
 262 void virtio_queue_notify(VirtIODevice *vdev, int n);
 263 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
 264 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
 265 int virtio_queue_set_host_notifier_mr(VirtIODevice *vdev, int n,
 266                                       MemoryRegion *mr, bool assign);
 267 int virtio_set_status(VirtIODevice *vdev, uint8_t val);
 268 void virtio_reset(void *opaque);
 269 void virtio_update_irq(VirtIODevice *vdev);
 270 int virtio_set_features(VirtIODevice *vdev, uint64_t val);
 271
 272 /* Base devices.  */
 273 typedef struct VirtIOBlkConf VirtIOBlkConf;
 274 struct virtio_net_conf;
 275 typedef struct virtio_serial_conf virtio_serial_conf;
 276 typedef struct virtio_input_conf virtio_input_conf;
 277 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 278 typedef struct VirtIORNGConf VirtIORNGConf;
 279
 280 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 281     DEFINE_PROP_BIT64("indirect_desc", _state, _field,    \
 282                       VIRTIO_RING_F_INDIRECT_DESC, true), \
 283     DEFINE_PROP_BIT64("event_idx", _state, _field,        \
 284                       VIRTIO_RING_F_EVENT_IDX, true),     \
 285     DEFINE_PROP_BIT64("notify_on_empty", _state, _field,  \
 286                       VIRTIO_F_NOTIFY_ON_EMPTY, true), \
 287     DEFINE_PROP_BIT64("any_layout", _state, _field, \
 288                       VIRTIO_F_ANY_LAYOUT, true), \
 289     DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
 290                       VIRTIO_F_IOMMU_PLATFORM, false), \
 291     DEFINE_PROP_BIT64("packed", _state, _field, \
 292                       VIRTIO_F_RING_PACKED, false)
 293
 294 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 295 bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n);
 296 bool virtio_queue_enabled(VirtIODevice *vdev, int n);
 297 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
 298 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
 299 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
 300 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
 301 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 302 unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 303 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n,
 304                                      unsigned int idx);
 305 void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
 306 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
 307 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
 308 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 309 uint16_t virtio_get_queue_index(VirtQueue *vq);
 310 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 311 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
 312                                                 bool with_irqfd);
 313 int virtio_device_start_ioeventfd(VirtIODevice *vdev);
 314 int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
 315 void virtio_device_release_ioeventfd(VirtIODevice *vdev);
 316 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
 317 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 318 void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled);
 319 void virtio_queue_host_notifier_read(EventNotifier *n);
 320 void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
 321                                                 VirtIOHandleAIOOutput handle_output);
 322 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
 323 VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
 324
 325 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
 326 {
 327     assert(fbit < 64);
 328     *features |= (1ULL << fbit);
 329 }
 330
 331 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
 332 {
 333     assert(fbit < 64);
 334     *features &= ~(1ULL << fbit);
 335 }
 336
 337 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit)
 338 {
 339     assert(fbit < 64);
 340     return !!(features & (1ULL << fbit));
 341 }
 342
 343 static inline bool virtio_vdev_has_feature(VirtIODevice *vdev,
 344                                            unsigned int fbit)
 345 {
 346     return virtio_has_feature(vdev->guest_features, fbit);
 347 }
 348
 349 static inline bool virtio_host_has_feature(VirtIODevice *vdev,
 350                                            unsigned int fbit)
 351 {
 352     return virtio_has_feature(vdev->host_features, fbit);
 353 }
 354
 355 static inline bool virtio_is_big_endian(VirtIODevice *vdev)
 356 {
 357     if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
 358         assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
 359         return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
 360     }
 361     /* Devices conforming to VIRTIO 1.0 or later are always LE. */
 362     return false;
 363 }
 364
 365 static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status)
 366 {
 367     if (vdev->use_started) {
 368         return vdev->started;
 369     }
 370
 371     return status & VIRTIO_CONFIG_S_DRIVER_OK;
 372 }
 373
 374 static inline void virtio_set_started(VirtIODevice *vdev, bool started)
 375 {
 376     if (started) {
 377         vdev->start_on_kick = false;
 378     }
 379
 380     if (vdev->use_started) {
 381         vdev->started = started;
 382     }
 383 }
 384
 385 static inline void virtio_set_disabled(VirtIODevice *vdev, bool disable)
 386 {
 387     if (vdev->use_disabled_flag) {
 388         vdev->disabled = disable;
 389     }
 390 }
 391
 392 static inline bool virtio_device_disabled(VirtIODevice *vdev)
 393 {
 394     return unlikely(vdev->disabled || vdev->broken);
 395 }
 396
 397 bool virtio_legacy_allowed(VirtIODevice *vdev);
 398 bool virtio_legacy_check_disabled(VirtIODevice *vdev);
 399
 400 #endif