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 "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 (addr + align - 1) & ~(align - 1);
  38 }
  39
  40 typedef struct VirtQueue VirtQueue;
  41
  42 #define VIRTQUEUE_MAX_SIZE 1024
  43
  44 typedef struct VirtQueueElement
  45 {
  46     unsigned int index;
  47     unsigned int out_num;
  48     unsigned int in_num;
  49     hwaddr *in_addr;
  50     hwaddr *out_addr;
  51     struct iovec *in_sg;
  52     struct iovec *out_sg;
  53 } VirtQueueElement;
  54
  55 #define VIRTIO_QUEUE_MAX 1024
  56
  57 #define VIRTIO_NO_VECTOR 0xffff
  58
  59 #define TYPE_VIRTIO_DEVICE "virtio-device"
  60 #define VIRTIO_DEVICE_GET_CLASS(obj) \
  61         OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)
  62 #define VIRTIO_DEVICE_CLASS(klass) \
  63         OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)
  64 #define VIRTIO_DEVICE(obj) \
  65         OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
  66
  67 enum virtio_device_endian {
  68     VIRTIO_DEVICE_ENDIAN_UNKNOWN,
  69     VIRTIO_DEVICE_ENDIAN_LITTLE,
  70     VIRTIO_DEVICE_ENDIAN_BIG,
  71 };
  72
  73 struct VirtIODevice
  74 {
  75     DeviceState parent_obj;
  76     const char *name;
  77     uint8_t status;
  78     uint8_t isr;
  79     uint16_t queue_sel;
  80     uint64_t guest_features;
  81     uint64_t host_features;
  82     size_t config_len;
  83     void *config;
  84     uint16_t config_vector;
  85     uint32_t generation;
  86     int nvectors;
  87     VirtQueue *vq;
  88     MemoryListener listener;
  89     uint16_t device_id;
  90     bool vm_running;
  91     bool broken; /* device in invalid state, needs reset */
  92     VMChangeStateEntry *vmstate;
  93     char *bus_name;
  94     uint8_t device_endian;
  95     bool use_guest_notifier_mask;
  96     AddressSpace *dma_as;
  97     QLIST_HEAD(, VirtQueue) *vector_queues;
  98 };
  99
 100 typedef struct VirtioDeviceClass {
 101     /*< private >*/
 102     DeviceClass parent;
 103     /*< public >*/
 104
 105     /* This is what a VirtioDevice must implement */
 106     DeviceRealize realize;
 107     DeviceUnrealize unrealize;
 108     uint64_t (*get_features)(VirtIODevice *vdev,
 109                              uint64_t requested_features,
 110                              Error **errp);
 111     uint64_t (*bad_features)(VirtIODevice *vdev);
 112     void (*set_features)(VirtIODevice *vdev, uint64_t val);
 113     int (*validate_features)(VirtIODevice *vdev);
 114     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 115     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 116     void (*reset)(VirtIODevice *vdev);
 117     void (*set_status)(VirtIODevice *vdev, uint8_t val);
 118     /* For transitional devices, this is a bitmap of features
 119      * that are only exposed on the legacy interface but not
 120      * the modern one.
 121      */
 122     uint64_t legacy_features;
 123     /* Test and clear event pending status.
 124      * Should be called after unmask to avoid losing events.
 125      * If backend does not support masking,
 126      * must check in frontend instead.
 127      */
 128     bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);
 129     /* Mask/unmask events from this vq. Any events reported
 130      * while masked will become pending.
 131      * If backend does not support masking,
 132      * must mask in frontend instead.
 133      */
 134     void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
 135     int (*start_ioeventfd)(VirtIODevice *vdev);
 136     void (*stop_ioeventfd)(VirtIODevice *vdev);
 137     /* Saving and loading of a device; trying to deprecate save/load
 138      * use vmsd for new devices.
 139      */
 140     void (*save)(VirtIODevice *vdev, QEMUFile *f);
 141     int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
 142     const VMStateDescription *vmsd;
 143 } VirtioDeviceClass;
 144
 145 void virtio_instance_init_common(Object *proxy_obj, void *data,
 146                                  size_t vdev_size, const char *vdev_name);
 147
 148 void virtio_init(VirtIODevice *vdev, const char *name,
 149                          uint16_t device_id, size_t config_size);
 150 void virtio_cleanup(VirtIODevice *vdev);
 151
 152 void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
 153
 154 /* Set the child bus name. */
 155 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
 156
 157 typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *);
 158 typedef bool (*VirtIOHandleAIOOutput)(VirtIODevice *, VirtQueue *);
 159
 160 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 161                             VirtIOHandleOutput handle_output);
 162
 163 void virtio_del_queue(VirtIODevice *vdev, int n);
 164
 165 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
 166                     unsigned int len);
 167 void virtqueue_flush(VirtQueue *vq, unsigned int count);
 168 void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
 169                               unsigned int len);
 170 void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem,
 171                      unsigned int len);
 172 bool virtqueue_rewind(VirtQueue *vq, unsigned int num);
 173 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 174                     unsigned int len, unsigned int idx);
 175
 176 void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem);
 177 void *virtqueue_pop(VirtQueue *vq, size_t sz);
 178 unsigned int virtqueue_drop_all(VirtQueue *vq);
 179 void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
 180 void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem);
 181 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
 182                           unsigned int out_bytes);
 183 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
 184                                unsigned int *out_bytes,
 185                                unsigned max_in_bytes, unsigned max_out_bytes);
 186
 187 void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
 188 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 189
 190 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
 191
 192 extern const VMStateInfo virtio_vmstate_info;
 193
 194 #define VMSTATE_VIRTIO_DEVICE \
 195     {                                         \
 196         .name = "virtio",                     \
 197         .info = &virtio_vmstate_info,         \
 198         .flags = VMS_SINGLE,                  \
 199     }
 200
 201 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
 202
 203 void virtio_notify_config(VirtIODevice *vdev);
 204
 205 void virtio_queue_set_notification(VirtQueue *vq, int enable);
 206
 207 int virtio_queue_ready(VirtQueue *vq);
 208
 209 int virtio_queue_empty(VirtQueue *vq);
 210
 211 /* Host binding interface.  */
 212
 213 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
 214 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
 215 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
 216 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 217 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 218 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 219 uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr);
 220 uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr);
 221 uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr);
 222 void virtio_config_modern_writeb(VirtIODevice *vdev,
 223                                  uint32_t addr, uint32_t data);
 224 void virtio_config_modern_writew(VirtIODevice *vdev,
 225                                  uint32_t addr, uint32_t data);
 226 void virtio_config_modern_writel(VirtIODevice *vdev,
 227                                  uint32_t addr, uint32_t data);
 228 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
 229 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
 230 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
 231 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 232 int virtio_queue_get_max_num(VirtIODevice *vdev, int n);
 233 int virtio_get_num_queues(VirtIODevice *vdev);
 234 void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
 235                             hwaddr avail, hwaddr used);
 236 void virtio_queue_update_rings(VirtIODevice *vdev, int n);
 237 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
 238 void virtio_queue_notify(VirtIODevice *vdev, int n);
 239 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
 240 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
 241 int virtio_set_status(VirtIODevice *vdev, uint8_t val);
 242 void virtio_reset(void *opaque);
 243 void virtio_update_irq(VirtIODevice *vdev);
 244 int virtio_set_features(VirtIODevice *vdev, uint64_t val);
 245
 246 /* Base devices.  */
 247 typedef struct VirtIOBlkConf VirtIOBlkConf;
 248 struct virtio_net_conf;
 249 typedef struct virtio_serial_conf virtio_serial_conf;
 250 typedef struct virtio_input_conf virtio_input_conf;
 251 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 252 typedef struct VirtIORNGConf VirtIORNGConf;
 253
 254 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 255     DEFINE_PROP_BIT64("indirect_desc", _state, _field,    \
 256                       VIRTIO_RING_F_INDIRECT_DESC, true), \
 257     DEFINE_PROP_BIT64("event_idx", _state, _field,        \
 258                       VIRTIO_RING_F_EVENT_IDX, true),     \
 259     DEFINE_PROP_BIT64("notify_on_empty", _state, _field,  \
 260                       VIRTIO_F_NOTIFY_ON_EMPTY, true), \
 261     DEFINE_PROP_BIT64("any_layout", _state, _field, \
 262                       VIRTIO_F_ANY_LAYOUT, true), \
 263     DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
 264                       VIRTIO_F_IOMMU_PLATFORM, false)
 265
 266 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 267 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
 268 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
 269 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
 270 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
 271 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 272 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 273 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
 274 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
 275 void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
 276 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 277 uint16_t virtio_get_queue_index(VirtQueue *vq);
 278 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 279 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
 280                                                 bool with_irqfd);
 281 int virtio_device_start_ioeventfd(VirtIODevice *vdev);
 282 void virtio_device_stop_ioeventfd(VirtIODevice *vdev);
 283 int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
 284 void virtio_device_release_ioeventfd(VirtIODevice *vdev);
 285 bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
 286 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 287 void virtio_queue_host_notifier_read(EventNotifier *n);
 288 void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
 289                                                 VirtIOHandleAIOOutput handle_output);
 290 VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
 291 VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
 292
 293 static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
 294 {
 295     assert(fbit < 64);
 296     *features |= (1ULL << fbit);
 297 }
 298
 299 static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
 300 {
 301     assert(fbit < 64);
 302     *features &= ~(1ULL << fbit);
 303 }
 304
 305 static inline bool virtio_has_feature(uint64_t features, unsigned int fbit)
 306 {
 307     assert(fbit < 64);
 308     return !!(features & (1ULL << fbit));
 309 }
 310
 311 static inline bool virtio_vdev_has_feature(VirtIODevice *vdev,
 312                                            unsigned int fbit)
 313 {
 314     return virtio_has_feature(vdev->guest_features, fbit);
 315 }
 316
 317 static inline bool virtio_host_has_feature(VirtIODevice *vdev,
 318                                            unsigned int fbit)
 319 {
 320     return virtio_has_feature(vdev->host_features, fbit);
 321 }
 322
 323 static inline bool virtio_is_big_endian(VirtIODevice *vdev)
 324 {
 325     if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
 326         assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
 327         return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
 328     }
 329     /* Devices conforming to VIRTIO 1.0 or later are always LE. */
 330     return false;
 331 }
 332 #endif