OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity
6e3c1a68f9
qemu-e2k/hw/usb/bus.c
Jonathan Davies f30815390a usb: drop unnecessary usb_device_post_load checks 
In usb_device_post_load, certain values of dev->setup_len or
dev->setup_index can cause -EINVAL to be returned. One example is when
setup_len exceeds 4096, the hard-coded value of sizeof(dev->data_buf).
This can happen through legitimate guest activity and will cause all
subsequent attempts to migrate the guest to fail in vmstate_load_state.

The values of these variables can be set by USB packets originating in
the guest. There are two ways in which they can be set: in
do_token_setup and in do_parameter in hw/usb/core.c.

It is easy to craft a USB packet in a guest that causes do_token_setup
to set setup_len to a value larger than 4096. When this has been done
once, all subsequent attempts to migrate the VM will fail in
usb_device_post_load until the VM is next power-cycled or a
smaller-sized USB packet is sent to the device.

Sample code for achieving this in a VM started with "-device usb-tablet"
running Linux with CONFIG_HIDRAW=y and HID_MAX_BUFFER_SIZE > 4096:

  #include <sys/types.h>
  #include <sys/stat.h>
  #include <fcntl.h>
  #include <unistd.h>

  int main() {
           char buf[4097];
           int fd = open("/dev/hidraw0", O_RDWR|O_NONBLOCK);

           buf[0] = 0x1;
           write(fd, buf, 4097);

           return 0;
  }

When this code is run in the VM, qemu will output:

  usb_generic_handle_packet: ctrl buffer too small (4097 > 4096)

A subsequent attempt to migrate the VM will fail and output the
following on the destination host:

  qemu-kvm: error while loading state for instance 0x0 of device '0000:00:06.7/1/usb-ptr'
  qemu-kvm: load of migration failed: Invalid argument

The idea behind checking the values of setup_len and setup_index before
they are used is correct, but doing it in usb_device_post_load feels
arbitrary, and will cause unnecessary migration failures. Indeed, none
of the commit messages for c60174e8, 9f8e9895 and 719ffe1f justify why
post_load is the right place to do these checks. They correctly point
out that the important thing to protect is the usb_packet_copy.

Instead, the right place to do the checks is in do_token_setup and
do_parameter. Indeed, there are already some checks here. We can examine
each of the disjuncts currently tested in usb_device_post_load to see
whether any need adding to do_token_setup or do_parameter to improve
safety there:

  * dev->setup_index < 0
     - This test is not needed because setup_index is explicitly set to
0 in do_token_setup and do_parameter.

  * dev->setup_len < 0
     - In both do_token_setup and do_parameter, the value of setup_len
is computed by (s->setup_buf[7] << 8) | s->setup_buf[6]. Since
s->setup_buf is a byte array and setup_len is an int32_t, it's
impossible for this arithmetic to set setup_len's top bit, so it can
never be negative.

  * dev->setup_index > dev->setup_len
     - Since setup_index is 0, this is equivalent to the previous test,
so is redundant.

  * dev->setup_len > sizeof(dev->data_buf)
     - This condition is already explicitly checked in both
do_token_setup and do_parameter.

Hence there is no need to bolster the existing checks in do_token_setup
or do_parameter, and we can safely remove these checks from
usb_device_post_load without reducing safety but allowing migrations to
proceed regardless of what USB packets have been generated by the guest.

Signed-off-by: Jonathan Davies <jonathan.davies@nutanix.com>
Message-Id: <20190107175117.23769-1-jonathan.davies@nutanix.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-01-08 12:37:52 +01:00

786 lines
21 KiB
C
Raw Blame History

#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/usb.h"
#include "hw/qdev.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "monitor/monitor.h"
#include "trace.h"
#include "qemu/cutils.h"
static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
static char *usb_get_dev_path(DeviceState *dev);
static char *usb_get_fw_dev_path(DeviceState *qdev);
static void usb_qdev_unrealize(DeviceState *qdev, Error **errp);
static Property usb_props[] = {
DEFINE_PROP_STRING("port", USBDevice, port_path),
DEFINE_PROP_STRING("serial", USBDevice, serial),
DEFINE_PROP_BIT("full-path", USBDevice, flags,
USB_DEV_FLAG_FULL_PATH, true),
DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
DEFINE_PROP_END_OF_LIST()
};
static void usb_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
k->print_dev = usb_bus_dev_print;
k->get_dev_path = usb_get_dev_path;
k->get_fw_dev_path = usb_get_fw_dev_path;
hc->unplug = qdev_simple_device_unplug_cb;
}
static const TypeInfo usb_bus_info = {
.name = TYPE_USB_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(USBBus),
.class_init = usb_bus_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ }
}
};
static int next_usb_bus = 0;
static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
static int usb_device_post_load(void *opaque, int version_id)
{
USBDevice *dev = opaque;
if (dev->state == USB_STATE_NOTATTACHED) {
dev->attached = false;
} else {
dev->attached = true;
}
return 0;
}
const VMStateDescription vmstate_usb_device = {
.name = "USBDevice",
.version_id = 1,
.minimum_version_id = 1,
.post_load = usb_device_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(addr, USBDevice),
VMSTATE_INT32(state, USBDevice),
VMSTATE_INT32(remote_wakeup, USBDevice),
VMSTATE_INT32(setup_state, USBDevice),
VMSTATE_INT32(setup_len, USBDevice),
VMSTATE_INT32(setup_index, USBDevice),
VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
VMSTATE_END_OF_LIST(),
}
};
void usb_bus_new(USBBus *bus, size_t bus_size,
USBBusOps *ops, DeviceState *host)
{
qbus_create_inplace(bus, bus_size, TYPE_USB_BUS, host, NULL);
qbus_set_bus_hotplug_handler(BUS(bus), &error_abort);
bus->ops = ops;
bus->busnr = next_usb_bus++;
QTAILQ_INIT(&bus->free);
QTAILQ_INIT(&bus->used);
QTAILQ_INSERT_TAIL(&busses, bus, next);
}
void usb_bus_release(USBBus *bus)
{
assert(next_usb_bus > 0);
QTAILQ_REMOVE(&busses, bus, next);
}
USBBus *usb_bus_find(int busnr)
{
USBBus *bus;
if (-1 == busnr)
return QTAILQ_FIRST(&busses);
QTAILQ_FOREACH(bus, &busses, next) {
if (bus->busnr == busnr)
return bus;
}
return NULL;
}
static void usb_device_realize(USBDevice *dev, Error **errp)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->realize) {
klass->realize(dev, errp);
}
}
USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->find_device) {
return klass->find_device(dev, addr);
}
return NULL;
}
static void usb_device_unrealize(USBDevice *dev, Error **errp)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->unrealize) {
klass->unrealize(dev, errp);
}
}
void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->cancel_packet) {
klass->cancel_packet(dev, p);
}
}
void usb_device_handle_attach(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_attach) {
klass->handle_attach(dev);
}
}
void usb_device_handle_reset(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_reset) {
klass->handle_reset(dev);
}
}
void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
int value, int index, int length, uint8_t *data)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_control) {
klass->handle_control(dev, p, request, value, index, length, data);
}
}
void usb_device_handle_data(USBDevice *dev, USBPacket *p)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_data) {
klass->handle_data(dev, p);
}
}
const char *usb_device_get_product_desc(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
return klass->product_desc;
}
const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (dev->usb_desc) {
return dev->usb_desc;
}
return klass->usb_desc;
}
void usb_device_set_interface(USBDevice *dev, int interface,
int alt_old, int alt_new)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->set_interface) {
klass->set_interface(dev, interface, alt_old, alt_new);
}
}
void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->flush_ep_queue) {
klass->flush_ep_queue(dev, ep);
}
}
void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->ep_stopped) {
klass->ep_stopped(dev, ep);
}
}
int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
int streams)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->alloc_streams) {
return klass->alloc_streams(dev, eps, nr_eps, streams);
}
return 0;
}
void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->free_streams) {
klass->free_streams(dev, eps, nr_eps);
}
}
static void usb_qdev_realize(DeviceState *qdev, Error **errp)
{
USBDevice *dev = USB_DEVICE(qdev);
Error *local_err = NULL;
pstrcpy(dev->product_desc, sizeof(dev->product_desc),
usb_device_get_product_desc(dev));
dev->auto_attach = 1;
QLIST_INIT(&dev->strings);
usb_ep_init(dev);
usb_claim_port(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
usb_device_realize(dev, &local_err);
if (local_err) {
usb_release_port(dev);
error_propagate(errp, local_err);
return;
}
if (dev->auto_attach) {
usb_device_attach(dev, &local_err);
if (local_err) {
usb_qdev_unrealize(qdev, NULL);
error_propagate(errp, local_err);
return;
}
}
}
static void usb_qdev_unrealize(DeviceState *qdev, Error **errp)
{
USBDevice *dev = USB_DEVICE(qdev);
USBDescString *s, *next;
QLIST_FOREACH_SAFE(s, &dev->strings, next, next) {
QLIST_REMOVE(s, next);
g_free(s->str);
g_free(s);
}
if (dev->attached) {
usb_device_detach(dev);
}
usb_device_unrealize(dev, errp);
if (dev->port) {
usb_release_port(dev);
}
}
typedef struct LegacyUSBFactory
{
const char *name;
const char *usbdevice_name;
USBDevice *(*usbdevice_init)(USBBus *bus, const char *params);
} LegacyUSBFactory;
static GSList *legacy_usb_factory;
void usb_legacy_register(const char *typename, const char *usbdevice_name,
USBDevice *(*usbdevice_init)(USBBus *bus,
const char *params))
{
if (usbdevice_name) {
LegacyUSBFactory *f = g_malloc0(sizeof(*f));
f->name = typename;
f->usbdevice_name = usbdevice_name;
f->usbdevice_init = usbdevice_init;
legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
}
}
USBDevice *usb_create(USBBus *bus, const char *name)
{
DeviceState *dev;
dev = qdev_create(&bus->qbus, name);
return USB_DEVICE(dev);
}
static USBDevice *usb_try_create_simple(USBBus *bus, const char *name,
Error **errp)
{
Error *err = NULL;
USBDevice *dev;
dev = USB_DEVICE(qdev_try_create(&bus->qbus, name));
if (!dev) {
error_setg(errp, "Failed to create USB device '%s'", name);
return NULL;
}
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err) {
error_propagate_prepend(errp, err,
"Failed to initialize USB device '%s': ",
name);
return NULL;
}
return dev;
}
USBDevice *usb_create_simple(USBBus *bus, const char *name)
{
return usb_try_create_simple(bus, name, &error_abort);
}
static void usb_fill_port(USBPort *port, void *opaque, int index,
USBPortOps *ops, int speedmask)
{
port->opaque = opaque;
port->index = index;
port->ops = ops;
port->speedmask = speedmask;
usb_port_location(port, NULL, index + 1);
}
void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
USBPortOps *ops, int speedmask)
{
usb_fill_port(port, opaque, index, ops, speedmask);
QTAILQ_INSERT_TAIL(&bus->free, port, next);
bus->nfree++;
}
void usb_register_companion(const char *masterbus, USBPort *ports[],
uint32_t portcount, uint32_t firstport,
void *opaque, USBPortOps *ops, int speedmask,
Error **errp)
{
USBBus *bus;
int i;
QTAILQ_FOREACH(bus, &busses, next) {
if (strcmp(bus->qbus.name, masterbus) == 0) {
break;
}
}
if (!bus) {
error_setg(errp, "USB bus '%s' not found", masterbus);
return;
}
if (!bus->ops->register_companion) {
error_setg(errp, "Can't use USB bus '%s' as masterbus,"
" it doesn't support companion controllers",
masterbus);
return;
}
for (i = 0; i < portcount; i++) {
usb_fill_port(ports[i], opaque, i, ops, speedmask);
}
bus->ops->register_companion(bus, ports, portcount, firstport, errp);
}
void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
{
if (upstream) {
int l = snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
upstream->path, portnr);
/* Max string is nn.nn.nn.nn.nn, which fits in 16 bytes */
assert(l < sizeof(downstream->path));
downstream->hubcount = upstream->hubcount + 1;
} else {
snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
downstream->hubcount = 0;
}
}
void usb_unregister_port(USBBus *bus, USBPort *port)
{
if (port->dev) {
object_unparent(OBJECT(port->dev));
}
QTAILQ_REMOVE(&bus->free, port, next);
bus->nfree--;
}
void usb_claim_port(USBDevice *dev, Error **errp)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port;
assert(dev->port == NULL);
if (dev->port_path) {
QTAILQ_FOREACH(port, &bus->free, next) {
if (strcmp(port->path, dev->port_path) == 0) {
break;
}
}
if (port == NULL) {
error_setg(errp, "usb port %s (bus %s) not found (in use?)",
dev->port_path, bus->qbus.name);
return;
}
} else {
if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
/* Create a new hub and chain it on */
usb_try_create_simple(bus, "usb-hub", NULL);
}
if (bus->nfree == 0) {
error_setg(errp, "tried to attach usb device %s to a bus "
"with no free ports", dev->product_desc);
return;
}
port = QTAILQ_FIRST(&bus->free);
}
trace_usb_port_claim(bus->busnr, port->path);
QTAILQ_REMOVE(&bus->free, port, next);
bus->nfree--;
dev->port = port;
port->dev = dev;
QTAILQ_INSERT_TAIL(&bus->used, port, next);
bus->nused++;
}
void usb_release_port(USBDevice *dev)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
assert(port != NULL);
trace_usb_port_release(bus->busnr, port->path);
QTAILQ_REMOVE(&bus->used, port, next);
bus->nused--;
dev->port = NULL;
port->dev = NULL;
QTAILQ_INSERT_TAIL(&bus->free, port, next);
bus->nfree++;
}
static void usb_mask_to_str(char *dest, size_t size,
unsigned int speedmask)
{
static const struct {
unsigned int mask;
const char *name;
} speeds[] = {
{ .mask = USB_SPEED_MASK_FULL, .name = "full" },
{ .mask = USB_SPEED_MASK_HIGH, .name = "high" },
{ .mask = USB_SPEED_MASK_SUPER, .name = "super" },
};
int i, pos = 0;
for (i = 0; i < ARRAY_SIZE(speeds); i++) {
if (speeds[i].mask & speedmask) {
pos += snprintf(dest + pos, size - pos, "%s%s",
pos ? "+" : "",
speeds[i].name);
}
}
}
void usb_check_attach(USBDevice *dev, Error **errp)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
char devspeed[32], portspeed[32];
assert(port != NULL);
assert(!dev->attached);
usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
trace_usb_port_attach(bus->busnr, port->path,
devspeed, portspeed);
if (!(port->speedmask & dev->speedmask)) {
error_setg(errp, "Warning: speed mismatch trying to attach"
" usb device \"%s\" (%s speed)"
" to bus \"%s\", port \"%s\" (%s speed)",
dev->product_desc, devspeed,
bus->qbus.name, port->path, portspeed);
return;
}
}
void usb_device_attach(USBDevice *dev, Error **errp)
{
USBPort *port = dev->port;
Error *local_err = NULL;
usb_check_attach(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
dev->attached = true;
usb_attach(port);
}
int usb_device_detach(USBDevice *dev)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
assert(port != NULL);
assert(dev->attached);
trace_usb_port_detach(bus->busnr, port->path);
usb_detach(port);
dev->attached = false;
return 0;
}
static const char *usb_speed(unsigned int speed)
{
static const char *txt[] = {
[ USB_SPEED_LOW ] = "1.5",
[ USB_SPEED_FULL ] = "12",
[ USB_SPEED_HIGH ] = "480",
[ USB_SPEED_SUPER ] = "5000",
};
if (speed >= ARRAY_SIZE(txt))
return "?";
return txt[speed];
}
static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
{
USBDevice *dev = USB_DEVICE(qdev);
USBBus *bus = usb_bus_from_device(dev);
monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
indent, "", bus->busnr, dev->addr,
dev->port ? dev->port->path : "-",
usb_speed(dev->speed), dev->product_desc,
dev->attached ? ", attached" : "");
}
static char *usb_get_dev_path(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
DeviceState *hcd = qdev->parent_bus->parent;
char *id = NULL;
if (dev->flags & (1 << USB_DEV_FLAG_FULL_PATH)) {
id = qdev_get_dev_path(hcd);
}
if (id) {
char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
g_free(id);
return ret;
} else {
return g_strdup(dev->port->path);
}
}
static char *usb_get_fw_dev_path(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
char *fw_path, *in;
ssize_t pos = 0, fw_len;
long nr;
fw_len = 32 + strlen(dev->port->path) * 6;
fw_path = g_malloc(fw_len);
in = dev->port->path;
while (fw_len - pos > 0) {
nr = strtol(in, &in, 10);
if (in[0] == '.') {
/* some hub between root port and device */
pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
in++;
} else {
/* the device itself */
pos += snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
qdev_fw_name(qdev), nr);
break;
}
}
return fw_path;
}
void hmp_info_usb(Monitor *mon, const QDict *qdict)
{
USBBus *bus;
USBDevice *dev;
USBPort *port;
if (QTAILQ_EMPTY(&busses)) {
monitor_printf(mon, "USB support not enabled\n");
return;
}
QTAILQ_FOREACH(bus, &busses, next) {
QTAILQ_FOREACH(port, &bus->used, next) {
dev = port->dev;
if (!dev)
continue;
monitor_printf(mon, " Device %d.%d, Port %s, Speed %s Mb/s, "
"Product %s%s%s\n",
bus->busnr, dev->addr, port->path,
usb_speed(dev->speed), dev->product_desc,
dev->qdev.id ? ", ID: " : "",
dev->qdev.id ?: "");
}
}
}
/* handle legacy -usbdevice cmd line option */
USBDevice *usbdevice_create(const char *cmdline)
{
USBBus *bus = usb_bus_find(-1 /* any */);
LegacyUSBFactory *f = NULL;
Error *err = NULL;
GSList *i;
char driver[32];
const char *params;
int len;
USBDevice *dev;
params = strchr(cmdline,':');
if (params) {
params++;
len = params - cmdline;
if (len > sizeof(driver))
len = sizeof(driver);
pstrcpy(driver, len, cmdline);
} else {
params = "";
pstrcpy(driver, sizeof(driver), cmdline);
}
for (i = legacy_usb_factory; i; i = i->next) {
f = i->data;
if (strcmp(f->usbdevice_name, driver) == 0) {
break;
}
}
if (i == NULL) {
#if 0
/* no error because some drivers are not converted (yet) */
error_report("usbdevice %s not found", driver);
#endif
return NULL;
}
if (!bus) {
error_report("Error: no usb bus to attach usbdevice %s, "
"please try -machine usb=on and check that "
"the machine model supports USB", driver);
return NULL;
}
if (f->usbdevice_init) {
dev = f->usbdevice_init(bus, params);
} else {
if (*params) {
error_report("usbdevice %s accepts no params", driver);
return NULL;
}
dev = usb_create(bus, f->name);
}
if (!dev) {
error_report("Failed to create USB device '%s'", f->name);
return NULL;
}
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err) {
error_reportf_err(err, "Failed to initialize USB device '%s': ",
f->name);
object_unparent(OBJECT(dev));
return NULL;
}
return dev;
}
static bool usb_get_attached(Object *obj, Error **errp)
{
USBDevice *dev = USB_DEVICE(obj);
return dev->attached;
}
static void usb_set_attached(Object *obj, bool value, Error **errp)
{
USBDevice *dev = USB_DEVICE(obj);
Error *err = NULL;
if (dev->attached == value) {
return;
}
if (value) {
usb_device_attach(dev, &err);
error_propagate(errp, err);
} else {
usb_device_detach(dev);
}
}
static void usb_device_instance_init(Object *obj)
{
USBDevice *dev = USB_DEVICE(obj);
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->attached_settable) {
object_property_add_bool(obj, "attached",
usb_get_attached, usb_set_attached,
NULL);
} else {
object_property_add_bool(obj, "attached",
usb_get_attached, NULL,
NULL);
}
}
static void usb_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->bus_type = TYPE_USB_BUS;
k->realize = usb_qdev_realize;
k->unrealize = usb_qdev_unrealize;
k->props = usb_props;
}
static const TypeInfo usb_device_type_info = {
.name = TYPE_USB_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(USBDevice),
.instance_init = usb_device_instance_init,
.abstract = true,
.class_size = sizeof(USBDeviceClass),
.class_init = usb_device_class_init,
};
static void usb_register_types(void)
{
type_register_static(&usb_bus_info);
type_register_static(&usb_device_type_info);
}
type_init(usb_register_types)
Reference in New Issue View Git Blame Copy Permalink