/* * Virtio Support * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef _QEMU_VIRTIO_H #define _QEMU_VIRTIO_H #include "hw/hw.h" #include "net/net.h" #include "hw/qdev.h" #include "sysemu/sysemu.h" #include "qemu/event_notifier.h" #ifdef CONFIG_VIRTFS #include "hw/virtio/virtio-9p.h" #endif /* from Linux's linux/virtio_config.h */ /* Status byte for guest to report progress, and synchronize features. */ /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 /* We have found a driver for the device. */ #define VIRTIO_CONFIG_S_DRIVER 2 /* Driver has used its parts of the config, and is happy */ #define VIRTIO_CONFIG_S_DRIVER_OK 4 /* We've given up on this device. */ #define VIRTIO_CONFIG_S_FAILED 0x80 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the * transport being used (eg. virtio_ring), the rest are per-device feature bits. */ #define VIRTIO_TRANSPORT_F_START 28 #define VIRTIO_TRANSPORT_F_END 32 /* We notify when the ring is completely used, even if the guest is suppressing * callbacks */ #define VIRTIO_F_NOTIFY_ON_EMPTY 24 /* Can the device handle any descriptor layout? */ #define VIRTIO_F_ANY_LAYOUT 27 /* We support indirect buffer descriptors */ #define VIRTIO_RING_F_INDIRECT_DESC 28 /* The Guest publishes the used index for which it expects an interrupt * at the end of the avail ring. Host should ignore the avail->flags field. */ /* The Host publishes the avail index for which it expects a kick * at the end of the used ring. Guest should ignore the used->flags field. */ #define VIRTIO_RING_F_EVENT_IDX 29 /* A guest should never accept this. It implies negotiation is broken. */ #define VIRTIO_F_BAD_FEATURE 30 /* from Linux's linux/virtio_ring.h */ /* This marks a buffer as continuing via the next field. */ #define VRING_DESC_F_NEXT 1 /* This marks a buffer as write-only (otherwise read-only). */ #define VRING_DESC_F_WRITE 2 /* This means the buffer contains a list of buffer descriptors. */ #define VRING_DESC_F_INDIRECT 4 /* This means don't notify other side when buffer added. */ #define VRING_USED_F_NO_NOTIFY 1 /* This means don't interrupt guest when buffer consumed. */ #define VRING_AVAIL_F_NO_INTERRUPT 1 struct VirtQueue; static inline hwaddr vring_align(hwaddr addr, unsigned long align) { return (addr + align - 1) & ~(align - 1); } typedef struct VirtQueue VirtQueue; #define VIRTQUEUE_MAX_SIZE 1024 typedef struct VirtQueueElement { unsigned int index; unsigned int out_num; unsigned int in_num; hwaddr in_addr[VIRTQUEUE_MAX_SIZE]; hwaddr out_addr[VIRTQUEUE_MAX_SIZE]; struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; } VirtQueueElement; #define VIRTIO_PCI_QUEUE_MAX 64 #define VIRTIO_NO_VECTOR 0xffff #define TYPE_VIRTIO_DEVICE "virtio-device" #define VIRTIO_DEVICE_GET_CLASS(obj) \ OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE) #define VIRTIO_DEVICE_CLASS(klass) \ OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE) #define VIRTIO_DEVICE(obj) \ OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE) struct VirtIODevice { DeviceState parent_obj; const char *name; uint8_t status; uint8_t isr; uint16_t queue_sel; uint32_t guest_features; size_t config_len; void *config; uint16_t config_vector; int nvectors; VirtQueue *vq; uint16_t device_id; bool vm_running; VMChangeStateEntry *vmstate; char *bus_name; }; typedef struct VirtioDeviceClass { /*< private >*/ DeviceClass parent; /*< public >*/ /* This is what a VirtioDevice must implement */ DeviceRealize realize; DeviceUnrealize unrealize; uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features); uint32_t (*bad_features)(VirtIODevice *vdev); void (*set_features)(VirtIODevice *vdev, uint32_t val); void (*get_config)(VirtIODevice *vdev, uint8_t *config); void (*set_config)(VirtIODevice *vdev, const uint8_t *config); void (*reset)(VirtIODevice *vdev); void (*set_status)(VirtIODevice *vdev, uint8_t val); /* Test and clear event pending status. * Should be called after unmask to avoid losing events. * If backend does not support masking, * must check in frontend instead. */ bool (*guest_notifier_pending)(VirtIODevice *vdev, int n); /* Mask/unmask events from this vq. Any events reported * while masked will become pending. * If backend does not support masking, * must mask in frontend instead. */ void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask); } VirtioDeviceClass; void virtio_init(VirtIODevice *vdev, const char *name, uint16_t device_id, size_t config_size); void virtio_cleanup(VirtIODevice *vdev); /* Set the child bus name. */ void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name); VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, void (*handle_output)(VirtIODevice *, VirtQueue *)); void virtio_del_queue(VirtIODevice *vdev, int n); void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, unsigned int len); void virtqueue_flush(VirtQueue *vq, unsigned int count); void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, unsigned int len, unsigned int idx); void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, size_t num_sg, int is_write); int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem); int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, unsigned int out_bytes); void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, unsigned int *out_bytes, unsigned max_in_bytes, unsigned max_out_bytes); void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); void virtio_save(VirtIODevice *vdev, QEMUFile *f); int virtio_load(VirtIODevice *vdev, QEMUFile *f); void virtio_notify_config(VirtIODevice *vdev); void virtio_queue_set_notification(VirtQueue *vq, int enable); int virtio_queue_ready(VirtQueue *vq); int virtio_queue_empty(VirtQueue *vq); /* Host binding interface. */ uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr); uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr); uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr); void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data); void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr); hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n); void virtio_queue_set_num(VirtIODevice *vdev, int n, int num); int virtio_queue_get_num(VirtIODevice *vdev, int n); void virtio_queue_set_align(VirtIODevice *vdev, int n, int align); void virtio_queue_notify(VirtIODevice *vdev, int n); uint16_t virtio_queue_vector(VirtIODevice *vdev, int n); void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector); void virtio_set_status(VirtIODevice *vdev, uint8_t val); void virtio_reset(void *opaque); void virtio_update_irq(VirtIODevice *vdev); int virtio_set_features(VirtIODevice *vdev, uint32_t val); /* Base devices. */ typedef struct VirtIOBlkConf VirtIOBlkConf; struct virtio_net_conf; VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, struct virtio_net_conf *net, uint32_t host_features); typedef struct virtio_serial_conf virtio_serial_conf; typedef struct VirtIOSCSIConf VirtIOSCSIConf; typedef struct VirtIORNGConf VirtIORNGConf; #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \ DEFINE_PROP_BIT("indirect_desc", _state, _field, \ VIRTIO_RING_F_INDIRECT_DESC, true), \ DEFINE_PROP_BIT("event_idx", _state, _field, \ VIRTIO_RING_F_EVENT_IDX, true) hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n); hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n); uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n); void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx); void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n); VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n); uint16_t virtio_get_queue_index(VirtQueue *vq); int virtio_queue_get_id(VirtQueue *vq); EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq); void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, bool with_irqfd); EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq); void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, bool set_handler); void virtio_queue_notify_vq(VirtQueue *vq); void virtio_irq(VirtQueue *vq); #endif