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.h"
  18 #include "net.h"
  19 #include "qdev.h"
  20 #include "sysemu.h"
  21 #include "block.h"
  22 #include "event_notifier.h"
  23 #ifdef CONFIG_LINUX
  24 #include "9p.h"
  25 #endif
  26
  27 /* from Linux's linux/virtio_config.h */
  28
  29 /* Status byte for guest to report progress, and synchronize features. */
  30 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
  31 #define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
  32 /* We have found a driver for the device. */
  33 #define VIRTIO_CONFIG_S_DRIVER          2
  34 /* Driver has used its parts of the config, and is happy */
  35 #define VIRTIO_CONFIG_S_DRIVER_OK       4
  36 /* We've given up on this device. */
  37 #define VIRTIO_CONFIG_S_FAILED          0x80
  38
  39 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the
  40  * transport being used (eg. virtio_ring), the rest are per-device feature bits. */
  41 #define VIRTIO_TRANSPORT_F_START        28
  42 #define VIRTIO_TRANSPORT_F_END          32
  43
  44 /* We notify when the ring is completely used, even if the guest is suppressing
  45  * callbacks */
  46 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
  47 /* We support indirect buffer descriptors */
  48 #define VIRTIO_RING_F_INDIRECT_DESC     28
  49 /* The Guest publishes the used index for which it expects an interrupt
  50  * at the end of the avail ring. Host should ignore the avail->flags field. */
  51 /* The Host publishes the avail index for which it expects a kick
  52  * at the end of the used ring. Guest should ignore the used->flags field. */
  53 #define VIRTIO_RING_F_EVENT_IDX         29
  54 /* A guest should never accept this.  It implies negotiation is broken. */
  55 #define VIRTIO_F_BAD_FEATURE            30
  56
  57 /* from Linux's linux/virtio_ring.h */
  58
  59 /* This marks a buffer as continuing via the next field. */
  60 #define VRING_DESC_F_NEXT       1
  61 /* This marks a buffer as write-only (otherwise read-only). */
  62 #define VRING_DESC_F_WRITE      2
  63 /* This means the buffer contains a list of buffer descriptors. */
  64 #define VRING_DESC_F_INDIRECT  4
  65
  66 /* This means don't notify other side when buffer added. */
  67 #define VRING_USED_F_NO_NOTIFY  1
  68 /* This means don't interrupt guest when buffer consumed. */
  69 #define VRING_AVAIL_F_NO_INTERRUPT      1
  70
  71 struct VirtQueue;
  72
  73 static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
  74                                              unsigned long align)
  75 {
  76     return (addr + align - 1) & ~(align - 1);
  77 }
  78
  79 typedef struct VirtQueue VirtQueue;
  80
  81 #define VIRTQUEUE_MAX_SIZE 1024
  82
  83 typedef struct VirtQueueElement
  84 {
  85     unsigned int index;
  86     unsigned int out_num;
  87     unsigned int in_num;
  88     target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
  89     target_phys_addr_t out_addr[VIRTQUEUE_MAX_SIZE];
  90     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
  91     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
  92 } VirtQueueElement;
  93
  94 typedef struct {
  95     void (*notify)(void * opaque, uint16_t vector);
  96     void (*save_config)(void * opaque, QEMUFile *f);
  97     void (*save_queue)(void * opaque, int n, QEMUFile *f);
  98     int (*load_config)(void * opaque, QEMUFile *f);
  99     int (*load_queue)(void * opaque, int n, QEMUFile *f);
 100     int (*load_done)(void * opaque, QEMUFile *f);
 101     unsigned (*get_features)(void * opaque);
 102     bool (*query_guest_notifiers)(void * opaque);
 103     int (*set_guest_notifiers)(void * opaque, bool assigned);
 104     int (*set_host_notifier)(void * opaque, int n, bool assigned);
 105     void (*vmstate_change)(void * opaque, bool running);
 106 } VirtIOBindings;
 107
 108 #define VIRTIO_PCI_QUEUE_MAX 64
 109
 110 #define VIRTIO_NO_VECTOR 0xffff
 111
 112 struct VirtIODevice
 113 {
 114     const char *name;
 115     uint8_t status;
 116     uint8_t isr;
 117     uint16_t queue_sel;
 118     uint32_t guest_features;
 119     size_t config_len;
 120     void *config;
 121     uint16_t config_vector;
 122     int nvectors;
 123     uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
 124     uint32_t (*bad_features)(VirtIODevice *vdev);
 125     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 126     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 127     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 128     void (*reset)(VirtIODevice *vdev);
 129     void (*set_status)(VirtIODevice *vdev, uint8_t val);
 130     VirtQueue *vq;
 131     const VirtIOBindings *binding;
 132     void *binding_opaque;
 133     uint16_t device_id;
 134     bool vm_running;
 135     VMChangeStateEntry *vmstate;
 136 };
 137
 138 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 139                             void (*handle_output)(VirtIODevice *,
 140                                                   VirtQueue *));
 141
 142 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
 143                     unsigned int len);
 144 void virtqueue_flush(VirtQueue *vq, unsigned int count);
 145 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 146                     unsigned int len, unsigned int idx);
 147
 148 void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr,
 149     size_t num_sg, int is_write);
 150 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
 151 int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
 152
 153 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 154
 155 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
 156
 157 int virtio_load(VirtIODevice *vdev, QEMUFile *f);
 158
 159 void virtio_cleanup(VirtIODevice *vdev);
 160
 161 void virtio_notify_config(VirtIODevice *vdev);
 162
 163 void virtio_queue_set_notification(VirtQueue *vq, int enable);
 164
 165 int virtio_queue_ready(VirtQueue *vq);
 166
 167 int virtio_queue_empty(VirtQueue *vq);
 168
 169 /* Host binding interface.  */
 170
 171 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
 172                                  size_t config_size, size_t struct_size);
 173 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
 174 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
 175 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
 176 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 177 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 178 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 179 void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
 180 target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
 181 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 182 void virtio_queue_notify(VirtIODevice *vdev, int n);
 183 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
 184 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
 185 void virtio_set_status(VirtIODevice *vdev, uint8_t val);
 186 void virtio_reset(void *opaque);
 187 void virtio_update_irq(VirtIODevice *vdev);
 188 int virtio_set_features(VirtIODevice *vdev, uint32_t val);
 189
 190 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
 191                         void *opaque);
 192
 193 /* Base devices.  */
 194 VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf,
 195                               char **serial);
 196 struct virtio_net_conf;
 197 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
 198                               struct virtio_net_conf *net);
 199 typedef struct virtio_serial_conf virtio_serial_conf;
 200 VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
 201 VirtIODevice *virtio_balloon_init(DeviceState *dev);
 202 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 203 VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *conf);
 204 #ifdef CONFIG_LINUX
 205 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
 206 #endif
 207
 208
 209 void virtio_net_exit(VirtIODevice *vdev);
 210 void virtio_blk_exit(VirtIODevice *vdev);
 211 void virtio_serial_exit(VirtIODevice *vdev);
 212 void virtio_balloon_exit(VirtIODevice *vdev);
 213 void virtio_scsi_exit(VirtIODevice *vdev);
 214
 215 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 216         DEFINE_PROP_BIT("indirect_desc", _state, _field, \
 217                         VIRTIO_RING_F_INDIRECT_DESC, true), \
 218         DEFINE_PROP_BIT("event_idx", _state, _field, \
 219                         VIRTIO_RING_F_EVENT_IDX, true)
 220
 221 target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 222 target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
 223 target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
 224 target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
 225 target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
 226 target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
 227 target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 228 target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
 229 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 230 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
 231 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 232 int virtio_queue_get_id(VirtQueue *vq);
 233 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 234 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 235 void virtio_queue_notify_vq(VirtQueue *vq);
 236 void virtio_irq(VirtQueue *vq);
 237 #endif