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/virtio/virtio-9p.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 /* Can the device handle any descriptor layout? */ 47 #define VIRTIO_F_ANY_LAYOUT 27 48 /* We support indirect buffer descriptors */ 49 #define VIRTIO_RING_F_INDIRECT_DESC 28 50 /* The Guest publishes the used index for which it expects an interrupt 51 * at the end of the avail ring. Host should ignore the avail->flags field. */ 52 /* The Host publishes the avail index for which it expects a kick 53 * at the end of the used ring. Guest should ignore the used->flags field. */ 54 #define VIRTIO_RING_F_EVENT_IDX 29 55 /* A guest should never accept this. It implies negotiation is broken. */ 56 #define VIRTIO_F_BAD_FEATURE 30 57 58 /* from Linux's linux/virtio_ring.h */ 59 60 /* This marks a buffer as continuing via the next field. */ 61 #define VRING_DESC_F_NEXT 1 62 /* This marks a buffer as write-only (otherwise read-only). */ 63 #define VRING_DESC_F_WRITE 2 64 /* This means the buffer contains a list of buffer descriptors. */ 65 #define VRING_DESC_F_INDIRECT 4 66 67 /* This means don't notify other side when buffer added. */ 68 #define VRING_USED_F_NO_NOTIFY 1 69 /* This means don't interrupt guest when buffer consumed. */ 70 #define VRING_AVAIL_F_NO_INTERRUPT 1 71 72 struct VirtQueue; 73 74 static inline hwaddr vring_align(hwaddr addr, 75 unsigned long align) 76 { 77 return (addr + align - 1) & ~(align - 1); 78 } 79 80 typedef struct VirtQueue VirtQueue; 81 82 #define VIRTQUEUE_MAX_SIZE 1024 83 84 typedef struct VirtQueueElement 85 { 86 unsigned int index; 87 unsigned int out_num; 88 unsigned int in_num; 89 hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; 90 hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; 91 struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; 92 struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; 93 } VirtQueueElement; 94 95 #define VIRTIO_PCI_QUEUE_MAX 64 96 97 #define VIRTIO_NO_VECTOR 0xffff 98 99 #define TYPE_VIRTIO_DEVICE "virtio-device" 100 #define VIRTIO_DEVICE_GET_CLASS(obj) \ 101 OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE) 102 #define VIRTIO_DEVICE_CLASS(klass) \ 103 OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE) 104 #define VIRTIO_DEVICE(obj) \ 105 OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE) 106 107 struct VirtIODevice 108 { 109 DeviceState parent_obj; 110 const char *name; 111 uint8_t status; 112 uint8_t isr; 113 uint16_t queue_sel; 114 uint32_t guest_features; 115 size_t config_len; 116 void *config; 117 uint16_t config_vector; 118 int nvectors; 119 VirtQueue *vq; 120 uint16_t device_id; 121 bool vm_running; 122 VMChangeStateEntry *vmstate; 123 char *bus_name; 124 }; 125 126 typedef struct VirtioDeviceClass { 127 /*< private >*/ 128 DeviceClass parent; 129 /*< public >*/ 130 131 /* This is what a VirtioDevice must implement */ 132 DeviceRealize realize; 133 DeviceUnrealize unrealize; 134 uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features); 135 uint32_t (*bad_features)(VirtIODevice *vdev); 136 void (*set_features)(VirtIODevice *vdev, uint32_t val); 137 void (*get_config)(VirtIODevice *vdev, uint8_t *config); 138 void (*set_config)(VirtIODevice *vdev, const uint8_t *config); 139 void (*reset)(VirtIODevice *vdev); 140 void (*set_status)(VirtIODevice *vdev, uint8_t val); 141 /* Test and clear event pending status. 142 * Should be called after unmask to avoid losing events. 143 * If backend does not support masking, 144 * must check in frontend instead. 145 */ 146 bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); 147 /* Mask/unmask events from this vq. Any events reported 148 * while masked will become pending. 149 * If backend does not support masking, 150 * must mask in frontend instead. 151 */ 152 void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); 153 void (*save)(VirtIODevice *vdev, QEMUFile *f); 154 int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id); 155 } VirtioDeviceClass; 156 157 void virtio_init(VirtIODevice *vdev, const char *name, 158 uint16_t device_id, size_t config_size); 159 void virtio_cleanup(VirtIODevice *vdev); 160 161 /* Set the child bus name. */ 162 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); 163 164 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, 165 void (*handle_output)(VirtIODevice *, 166 VirtQueue *)); 167 168 void virtio_del_queue(VirtIODevice *vdev, int n); 169 170 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, 171 unsigned int len); 172 void virtqueue_flush(VirtQueue *vq, unsigned int count); 173 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, 174 unsigned int len, unsigned int idx); 175 176 void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, 177 size_t num_sg, int is_write); 178 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem); 179 int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, 180 unsigned int out_bytes); 181 void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, 182 unsigned int *out_bytes, 183 unsigned max_in_bytes, unsigned max_out_bytes); 184 185 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); 186 187 void virtio_save(VirtIODevice *vdev, QEMUFile *f); 188 189 int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id); 190 191 void virtio_notify_config(VirtIODevice *vdev); 192 193 void virtio_queue_set_notification(VirtQueue *vq, int enable); 194 195 int virtio_queue_ready(VirtQueue *vq); 196 197 int virtio_queue_empty(VirtQueue *vq); 198 199 /* Host binding interface. */ 200 201 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); 202 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); 203 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); 204 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); 205 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); 206 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); 207 void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); 208 hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); 209 void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); 210 int virtio_queue_get_num(VirtIODevice *vdev, int n); 211 void virtio_queue_set_align(VirtIODevice *vdev, int n, int align); 212 void virtio_queue_notify(VirtIODevice *vdev, int n); 213 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); 214 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); 215 void virtio_set_status(VirtIODevice *vdev, uint8_t val); 216 void virtio_reset(void *opaque); 217 void virtio_update_irq(VirtIODevice *vdev); 218 int virtio_set_features(VirtIODevice *vdev, uint32_t val); 219 220 /* Base devices. */ 221 typedef struct VirtIOBlkConf VirtIOBlkConf; 222 struct virtio_net_conf; 223 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, 224 struct virtio_net_conf *net, 225 uint32_t host_features); 226 typedef struct virtio_serial_conf virtio_serial_conf; 227 typedef struct VirtIOSCSIConf VirtIOSCSIConf; 228 typedef struct VirtIORNGConf VirtIORNGConf; 229 230 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ 231 DEFINE_PROP_BIT("indirect_desc", _state, _field, \ 232 VIRTIO_RING_F_INDIRECT_DESC, true), \ 233 DEFINE_PROP_BIT("event_idx", _state, _field, \ 234 VIRTIO_RING_F_EVENT_IDX, true) 235 236 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); 237 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); 238 hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); 239 hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n); 240 hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); 241 hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); 242 hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); 243 hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n); 244 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); 245 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); 246 void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n); 247 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); 248 uint16_t virtio_get_queue_index(VirtQueue *vq); 249 int virtio_queue_get_id(VirtQueue *vq); 250 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); 251 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, 252 bool with_irqfd); 253 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); 254 void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, 255 bool set_handler); 256 void virtio_queue_notify_vq(VirtQueue *vq); 257 void virtio_irq(VirtQueue *vq); 258 #endif 259