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