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* VirtioBus
* Copyright (C) 2012 : GreenSocs Ltd
* , email:
* Developed by :
* Frederic Konrad <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, see <>.
#ifndef VIRTIO_BUS_H
#define VIRTIO_BUS_H
#include "hw/qdev.h"
#include "sysemu/sysemu.h"
#include "hw/virtio/virtio.h"
#define TYPE_VIRTIO_BUS "virtio-bus"
#define VIRTIO_BUS_GET_CLASS(obj) \
#define VIRTIO_BUS_CLASS(klass) \
#define VIRTIO_BUS(obj) OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_BUS)
typedef struct VirtioBusState VirtioBusState;
typedef struct VirtioBusClass {
/* This is what a VirtioBus must implement */
BusClass parent;
void (*notify)(DeviceState *d, uint16_t vector);
void (*save_config)(DeviceState *d, QEMUFile *f);
void (*save_queue)(DeviceState *d, int n, QEMUFile *f);
int (*load_config)(DeviceState *d, QEMUFile *f);
int (*load_queue)(DeviceState *d, int n, QEMUFile *f);
int (*load_done)(DeviceState *d, QEMUFile *f);
unsigned (*get_features)(DeviceState *d);
bool (*query_guest_notifiers)(DeviceState *d);
int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign);
int (*set_host_notifier)(DeviceState *d, int n, bool assigned);
void (*vmstate_change)(DeviceState *d, bool running);
* transport independent init function.
* This is called by virtio-bus just after the device is plugged.
void (*device_plugged)(DeviceState *d);
* transport independent exit function.
* This is called by virtio-bus just before the device is unplugged.
void (*device_unplugged)(DeviceState *d);
* Does the transport have variable vring alignment?
* (ie can it ever call virtio_queue_set_align()?)
* Note that changing this will break migration for this transport.
bool has_variable_vring_alignment;
} VirtioBusClass;
struct VirtioBusState {
BusState parent_obj;
int virtio_bus_device_plugged(VirtIODevice *vdev);
void virtio_bus_reset(VirtioBusState *bus);
void virtio_bus_device_unplugged(VirtIODevice *bus);
/* Get the device id of the plugged device. */
uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus);
/* Get the config_len field of the plugged device. */
size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus);
/* Get the features of the plugged device. */
uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
uint32_t requested_features);
/* Set the features of the plugged device. */
void virtio_bus_set_vdev_features(VirtioBusState *bus,
uint32_t requested_features);
/* Get bad features of the plugged device. */
uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus);
/* Get config of the plugged device. */
void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config);
/* Set config of the plugged device. */
void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config);
static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus)
BusState *qbus = &bus->parent_obj;
BusChild *kid = QTAILQ_FIRST(&qbus->children);
DeviceState *qdev = kid ? kid->child : NULL;
/* This is used on the data path, the cast is guaranteed
* to succeed by the qdev machinery.
return (VirtIODevice *)qdev;
#endif /* VIRTIO_BUS_H */