hw/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 #ifdef CONFIG_VIRTFS
  23 #include "hw/9pfs/virtio-9p-device.h"
  24 #endif
  25
  26 /* from Linux's linux/virtio_config.h */
  27
  28 /* Status byte for guest to report progress, and synchronize features. */
  29 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
  30 #define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
  31 /* We have found a driver for the device. */
  32 #define VIRTIO_CONFIG_S_DRIVER          2
  33 /* Driver has used its parts of the config, and is happy */
  34 #define VIRTIO_CONFIG_S_DRIVER_OK       4
  35 /* We've given up on this device. */
  36 #define VIRTIO_CONFIG_S_FAILED          0x80
  37
  38 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the
  39  * transport being used (eg. virtio_ring), the rest are per-device feature bits. */
  40 #define VIRTIO_TRANSPORT_F_START        28
  41 #define VIRTIO_TRANSPORT_F_END          32
  42
  43 /* We notify when the ring is completely used, even if the guest is suppressing
  44  * callbacks */
  45 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
  46 /* We support indirect buffer descriptors */
  47 #define VIRTIO_RING_F_INDIRECT_DESC     28
  48 /* The Guest publishes the used index for which it expects an interrupt
  49  * at the end of the avail ring. Host should ignore the avail->flags field. */
  50 /* The Host publishes the avail index for which it expects a kick
  51  * at the end of the used ring. Guest should ignore the used->flags field. */
  52 #define VIRTIO_RING_F_EVENT_IDX         29
  53 /* A guest should never accept this.  It implies negotiation is broken. */
  54 #define VIRTIO_F_BAD_FEATURE            30
  55
  56 /* from Linux's linux/virtio_ring.h */
  57
  58 /* This marks a buffer as continuing via the next field. */
  59 #define VRING_DESC_F_NEXT       1
  60 /* This marks a buffer as write-only (otherwise read-only). */
  61 #define VRING_DESC_F_WRITE      2
  62 /* This means the buffer contains a list of buffer descriptors. */
  63 #define VRING_DESC_F_INDIRECT  4
  64
  65 /* This means don't notify other side when buffer added. */
  66 #define VRING_USED_F_NO_NOTIFY  1
  67 /* This means don't interrupt guest when buffer consumed. */
  68 #define VRING_AVAIL_F_NO_INTERRUPT      1
  69
  70 struct VirtQueue;
  71
  72 static inline hwaddr vring_align(hwaddr addr,
  73                                              unsigned long align)
  74 {
  75     return (addr + align - 1) & ~(align - 1);
  76 }
  77
  78 typedef struct VirtQueue VirtQueue;
  79
  80 #define VIRTQUEUE_MAX_SIZE 1024
  81
  82 typedef struct VirtQueueElement
  83 {
  84     unsigned int index;
  85     unsigned int out_num;
  86     unsigned int in_num;
  87     hwaddr in_addr[VIRTQUEUE_MAX_SIZE];
  88     hwaddr out_addr[VIRTQUEUE_MAX_SIZE];
  89     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
  90     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
  91 } VirtQueueElement;
  92
  93 typedef struct {
  94     void (*notify)(DeviceState *d, uint16_t vector);
  95     void (*save_config)(DeviceState *d, QEMUFile *f);
  96     void (*save_queue)(DeviceState *d, int n, QEMUFile *f);
  97     int (*load_config)(DeviceState *d, QEMUFile *f);
  98     int (*load_queue)(DeviceState *d, int n, QEMUFile *f);
  99     int (*load_done)(DeviceState *d, QEMUFile *f);
 100     unsigned (*get_features)(DeviceState *d);
 101     bool (*query_guest_notifiers)(DeviceState *d);
 102     int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assigned);
 103     int (*set_host_notifier)(DeviceState *d, int n, bool assigned);
 104     void (*vmstate_change)(DeviceState *d, bool running);
 105 } VirtIOBindings;
 106
 107 #define VIRTIO_PCI_QUEUE_MAX 64
 108
 109 #define VIRTIO_NO_VECTOR 0xffff
 110
 111 #define TYPE_VIRTIO_DEVICE "virtio-device"
 112 #define VIRTIO_DEVICE_GET_CLASS(obj) \
 113         OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)
 114 #define VIRTIO_DEVICE_CLASS(klass) \
 115         OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)
 116 #define VIRTIO_DEVICE(obj) \
 117         OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
 118
 119 struct VirtIODevice
 120 {
 121     DeviceState parent_obj;
 122     const char *name;
 123     uint8_t status;
 124     uint8_t isr;
 125     uint16_t queue_sel;
 126     uint32_t guest_features;
 127     size_t config_len;
 128     void *config;
 129     uint16_t config_vector;
 130     int nvectors;
 131     /*
 132      * Function pointers will be removed at the end of the series as they are in
 133      * VirtioDeviceClass.
 134      */
 135     uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
 136     uint32_t (*bad_features)(VirtIODevice *vdev);
 137     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 138     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 139     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 140     void (*reset)(VirtIODevice *vdev);
 141     void (*set_status)(VirtIODevice *vdev, uint8_t val);
 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
 155     VirtQueue *vq;
 156     const VirtIOBindings *binding;
 157     DeviceState *binding_opaque;
 158     uint16_t device_id;
 159     bool vm_running;
 160     VMChangeStateEntry *vmstate;
 161 };
 162
 163 typedef struct VirtioDeviceClass {
 164     /* This is what a VirtioDevice must implement */
 165     DeviceClass parent;
 166     int (*init)(VirtIODevice *vdev);
 167     uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
 168     uint32_t (*bad_features)(VirtIODevice *vdev);
 169     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 170     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 171     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 172     void (*reset)(VirtIODevice *vdev);
 173     void (*set_status)(VirtIODevice *vdev, uint8_t val);
 174 } VirtioDeviceClass;
 175
 176 void virtio_init(VirtIODevice *vdev, const char *name,
 177                          uint16_t device_id, size_t config_size);
 178 void virtio_common_cleanup(VirtIODevice *vdev);
 179
 180 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 181                             void (*handle_output)(VirtIODevice *,
 182                                                   VirtQueue *));
 183
 184 void virtio_del_queue(VirtIODevice *vdev, int n);
 185
 186 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
 187                     unsigned int len);
 188 void virtqueue_flush(VirtQueue *vq, unsigned int count);
 189 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 190                     unsigned int len, unsigned int idx);
 191
 192 void virtqueue_map_sg(struct iovec *sg, hwaddr *addr,
 193     size_t num_sg, int is_write);
 194 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
 195 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
 196                           unsigned int out_bytes);
 197 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
 198                                unsigned int *out_bytes,
 199                                unsigned max_in_bytes, unsigned max_out_bytes);
 200
 201 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 202
 203 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
 204
 205 int virtio_load(VirtIODevice *vdev, QEMUFile *f);
 206
 207 void virtio_cleanup(VirtIODevice *vdev);
 208
 209 void virtio_notify_config(VirtIODevice *vdev);
 210
 211 void virtio_queue_set_notification(VirtQueue *vq, int enable);
 212
 213 int virtio_queue_ready(VirtQueue *vq);
 214
 215 int virtio_queue_empty(VirtQueue *vq);
 216
 217 /* Host binding interface.  */
 218
 219 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
 220                                  size_t config_size, size_t struct_size);
 221 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
 222 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
 223 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
 224 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 225 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 226 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 227 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
 228 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
 229 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 230 void virtio_queue_notify(VirtIODevice *vdev, int n);
 231 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
 232 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
 233 void virtio_set_status(VirtIODevice *vdev, uint8_t val);
 234 void virtio_reset(void *opaque);
 235 void virtio_update_irq(VirtIODevice *vdev);
 236 int virtio_set_features(VirtIODevice *vdev, uint32_t val);
 237
 238 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
 239                         DeviceState *opaque);
 240
 241 /* Base devices.  */
 242 typedef struct VirtIOBlkConf VirtIOBlkConf;
 243 VirtIODevice *virtio_blk_init(DeviceState *dev, VirtIOBlkConf *blk);
 244 struct virtio_net_conf;
 245 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
 246                               struct virtio_net_conf *net,
 247                               uint32_t host_features);
 248 typedef struct virtio_serial_conf virtio_serial_conf;
 249 VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
 250 VirtIODevice *virtio_balloon_init(DeviceState *dev);
 251 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 252 VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *conf);
 253 typedef struct VirtIORNGConf VirtIORNGConf;
 254 VirtIODevice *virtio_rng_init(DeviceState *dev, VirtIORNGConf *conf);
 255 #ifdef CONFIG_VIRTFS
 256 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
 257 #endif
 258
 259
 260 void virtio_net_exit(VirtIODevice *vdev);
 261 void virtio_blk_exit(VirtIODevice *vdev);
 262 void virtio_serial_exit(VirtIODevice *vdev);
 263 void virtio_balloon_exit(VirtIODevice *vdev);
 264 void virtio_scsi_exit(VirtIODevice *vdev);
 265 void virtio_rng_exit(VirtIODevice *vdev);
 266
 267 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 268         DEFINE_PROP_BIT("indirect_desc", _state, _field, \
 269                         VIRTIO_RING_F_INDIRECT_DESC, true), \
 270         DEFINE_PROP_BIT("event_idx", _state, _field, \
 271                         VIRTIO_RING_F_EVENT_IDX, true)
 272
 273 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 274 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
 275 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
 276 hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
 277 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
 278 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
 279 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 280 hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
 281 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 282 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
 283 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 284 uint16_t virtio_get_queue_index(VirtQueue *vq);
 285 int virtio_queue_get_id(VirtQueue *vq);
 286 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 287 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
 288                                                 bool with_irqfd);
 289 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 290 void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
 291                                                bool set_handler);
 292 void virtio_queue_notify_vq(VirtQueue *vq);
 293 void virtio_irq(VirtQueue *vq);
 294 #endif