4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_H
15 #define _QEMU_VIRTIO_H
21 #include "block_int.h"
22 #include "event_notifier.h"
27 /* from Linux's linux/virtio_config.h */
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
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
44 /* We notify when the ring is completely used, even if the guest is suppressing
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
57 /* from Linux's linux/virtio_ring.h */
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
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
73 static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
76 return (addr + align - 1) & ~(align - 1);
79 typedef struct VirtQueue VirtQueue;
81 #define VIRTQUEUE_MAX_SIZE 1024
83 typedef struct VirtQueueElement
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];
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);
108 #define VIRTIO_PCI_QUEUE_MAX 64
110 #define VIRTIO_NO_VECTOR 0xffff
118 uint32_t guest_features;
121 uint16_t config_vector;
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);
131 const VirtIOBindings *binding;
132 void *binding_opaque;
135 VMChangeStateEntry *vmstate;
138 static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)
140 if (vdev->set_status) {
141 vdev->set_status(vdev, val);
146 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
147 void (*handle_output)(VirtIODevice *,
150 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
152 void virtqueue_flush(VirtQueue *vq, unsigned int count);
153 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
154 unsigned int len, unsigned int idx);
156 void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr,
157 size_t num_sg, int is_write);
158 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
159 int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
161 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
163 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
165 int virtio_load(VirtIODevice *vdev, QEMUFile *f);
167 void virtio_cleanup(VirtIODevice *vdev);
169 void virtio_notify_config(VirtIODevice *vdev);
171 void virtio_queue_set_notification(VirtQueue *vq, int enable);
173 int virtio_queue_ready(VirtQueue *vq);
175 int virtio_queue_empty(VirtQueue *vq);
177 /* Host binding interface. */
179 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
180 size_t config_size, size_t struct_size);
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 void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
188 target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
189 int virtio_queue_get_num(VirtIODevice *vdev, int n);
190 void virtio_queue_notify(VirtIODevice *vdev, int n);
191 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
192 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
193 void virtio_reset(void *opaque);
194 void virtio_update_irq(VirtIODevice *vdev);
196 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
200 VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf);
201 struct virtio_net_conf;
202 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
203 struct virtio_net_conf *net);
204 typedef struct virtio_serial_conf virtio_serial_conf;
205 VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
206 VirtIODevice *virtio_balloon_init(DeviceState *dev);
208 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
212 void virtio_net_exit(VirtIODevice *vdev);
213 void virtio_blk_exit(VirtIODevice *vdev);
214 void virtio_serial_exit(VirtIODevice *vdev);
216 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
217 DEFINE_PROP_BIT("indirect_desc", _state, _field, \
218 VIRTIO_RING_F_INDIRECT_DESC, true), \
219 DEFINE_PROP_BIT("event_idx", _state, _field, \
220 VIRTIO_RING_F_EVENT_IDX, true)
222 target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
223 target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
224 target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
225 target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
226 target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
227 target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
228 target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);
229 target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
230 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
231 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
232 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
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);