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