int
qemuPrepareHostdevUSBDevices(virQEMUDriverPtr driver,
const char *name,
virUSBDeviceListPtr list)
{
int i, j;
unsigned int count;
virUSBDevicePtr tmp;
virObjectLock(driver->activeUsbHostdevs);
count = virUSBDeviceListCount(list);
for (i = 0; i < count; i++) {
virUSBDevicePtr usb = virUSBDeviceListGet(list, i);
if ((tmp = virUSBDeviceListFind(driver->activeUsbHostdevs, usb))) {
const char *other_name = virUSBDeviceGetUsedBy(tmp);
if (other_name)
virReportError(VIR_ERR_OPERATION_INVALID,
_("USB device %s is in use by domain %s"),
virUSBDeviceGetName(tmp), other_name);
else
virReportError(VIR_ERR_OPERATION_INVALID,
_("USB device %s is already in use"),
virUSBDeviceGetName(tmp));
goto error;
}
virUSBDeviceSetUsedBy(usb, name);
VIR_DEBUG("Adding %03d.%03d dom=%s to activeUsbHostdevs",
virUSBDeviceGetBus(usb), virUSBDeviceGetDevno(usb), name);
/*
* The caller is responsible to steal these usb devices
* from the virUSBDeviceList that passed in on success,
* perform rollback on failure.
*/
if (virUSBDeviceListAdd(driver->activeUsbHostdevs, usb) < 0)
goto error;
}
virObjectUnlock(driver->activeUsbHostdevs);
return 0;
error:
for (j = 0; j < i; j++) {
tmp = virUSBDeviceListGet(list, i);
virUSBDeviceListSteal(driver->activeUsbHostdevs, tmp);
}
virObjectUnlock(driver->activeUsbHostdevs);
return -1;
}
static int
virLXCPrepareHostUSBDevices(virLXCDriverPtr driver,
virDomainDefPtr def)
{
size_t i;
int ret = -1;
virUSBDeviceList *list;
virUSBDevicePtr tmp;
virDomainHostdevDefPtr *hostdevs = def->hostdevs;
int nhostdevs = def->nhostdevs;
/* To prevent situation where USB device is assigned to two domains
* we need to keep a list of currently assigned USB devices.
* This is done in several loops which cannot be joined into one big
* loop. See virLXCPrepareHostdevPCIDevices()
*/
if (!(list = virUSBDeviceListNew()))
goto cleanup;
/* Loop 1: build temporary list
*/
for (i = 0; i < nhostdevs; i++) {
virDomainHostdevDefPtr hostdev = hostdevs[i];
bool required = true;
virUSBDevicePtr usb;
if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS)
continue;
if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
continue;
if (hostdev->startupPolicy == VIR_DOMAIN_STARTUP_POLICY_OPTIONAL)
required = false;
if (virLXCFindHostdevUSBDevice(hostdev, required, &usb) < 0)
goto cleanup;
if (usb && virUSBDeviceListAdd(list, usb) < 0) {
virUSBDeviceFree(usb);
goto cleanup;
}
}
/* Mark devices in temporary list as used by @name
* and add them do driver list. However, if something goes
* wrong, perform rollback.
*/
if (virLXCPrepareHostdevUSBDevices(driver, def->name, list) < 0)
goto cleanup;
/* Loop 2: Temporary list was successfully merged with
* driver list, so steal all items to avoid freeing them
* in cleanup label.
*/
while (virUSBDeviceListCount(list) > 0) {
tmp = virUSBDeviceListGet(list, 0);
virUSBDeviceListSteal(list, tmp);
}
ret = 0;
cleanup:
virObjectUnref(list);
return ret;
}