On 05/19/2016 09:14 AM, Chunyan Liu wrote:
> Support hot attach/detach a USB host device to guest.
> Curretnly libxl only supports xen PV guest, and only
> supports specifying USB host device by 'bus number'
> and 'device number'.
>
> For example:
> usb.xml:
> <hostdev mode='subsystem' type='usb' managed='no'>
> <source>
> <address bus='1' device='3'/>
> </source>
> </hostdev>
> #xl attach-device dom usb.xml
> #xl detach-device dom usb.xml
>
> Signed-off-by: Chunyan Liu <cyliu@xxxxxxxx>
> ---
> Changes:
> * add LIBXL_HAVE_PVUSB check
> * fix Jim's comments
>
> src/libxl/libxl_driver.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 135 insertions(+), 1 deletion(-)
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 960673f..a171efe 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -3028,6 +3028,56 @@ libxlDomainAttachHostPCIDevice(libxlDriverPrivatePtr driver,
> return ret;
> }
>
> +#ifdef LIBXL_HAVE_PVUSB
> +static int
> +libxlDomainAttachHostUSBDevice(libxlDriverPrivatePtr driver,
> + virDomainObjPtr vm,
> + virDomainHostdevDefPtr hostdev)
> +{
> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
> + libxl_device_usbdev usbdev;
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
> + int ret = -1;
> +
> + libxl_device_usbdev_init(&usbdev);
> +
> + if (hostdev->mode != VIR_DOMAIN_HOSTDEV_MODE_SUBSYS ||
> + hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB)
> + goto cleanup;
> +
> + if (VIR_REALLOC_N(vm->def->hostdevs, vm->def->nhostdevs + 1) < 0)
> + goto cleanup;
> +
> + if (virHostdevPrepareUSBDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, &hostdev, 1, 0) < 0)
> + goto cleanup;
> +
> + if (libxlMakeUSB(hostdev, &usbdev) < 0)
> + goto reattach;
> +
> + if (libxl_device_usbdev_add(cfg->ctx, vm->def->id, &usbdev, 0) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("libxenlight failed to attach usb device Busnum:%3x, Devnum:%3x"),
> + hostdev->source.subsys.u.usb.bus,
> + hostdev->source.subsys.u.usb.device);
> + goto reattach;
> + }
> +
> + vm->def->hostdevs[vm->def->nhostdevs++] = hostdev;
> + ret = 0;
> + goto cleanup;
> +
> + reattach:
> + virHostdevReAttachUSBDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, &hostdev, 1);
> +
> + cleanup:
> + virObjectUnref(cfg);
> + libxl_device_usbdev_dispose(&usbdev);
> + return ret;
> +}
> +#endif
> +
> static int
> libxlDomainAttachHostDevice(libxlDriverPrivatePtr driver,
> virDomainObjPtr vm,
> @@ -3046,6 +3096,13 @@ libxlDomainAttachHostDevice(libxlDriverPrivatePtr driver,
> return -1;
> break;
>
> +#ifdef LIBXL_HAVE_PVUSB
> + case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
> + if (libxlDomainAttachHostUSBDevice(driver, vm, hostdev) < 0)
> + return -1;
> + break;
> +#endif
> +
> default:
> virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
> _("hostdev subsys type '%s' not supported"),
> @@ -3271,7 +3328,9 @@ libxlDomainAttachDeviceConfig(virDomainDefPtr vmdef, virDomainDeviceDefPtr dev)
> case VIR_DOMAIN_DEVICE_HOSTDEV:
> hostdev = dev->data.hostdev;
>
> - if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI)
> + if (hostdev->source.subsys.type !=
> + (VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI ||
> + VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB))
Is this conditional correct when LIBXL_HAVE_PVUSB isn't there?
> return -1;
>
> if (virDomainHostdevFind(vmdef, hostdev, &found) >= 0) {
> @@ -3389,6 +3448,76 @@ libxlDomainDetachHostPCIDevice(libxlDriverPrivatePtr driver,
> return ret;
> }
>
> +#ifdef LIBXL_HAVE_PVUSB
> +static int
> +libxlDomainDetachHostUSBDevice(libxlDriverPrivatePtr driver,
> + virDomainObjPtr vm,
> + virDomainHostdevDefPtr hostdev)
> +{
> + libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
> + virDomainHostdevSubsysPtr subsys = &hostdev->source.subsys;
> + virDomainHostdevSubsysUSBPtr usbsrc = &subsys->u.usb;
> + virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
> + libxl_device_usbdev usbdev;
> + libxl_device_usbdev *usbdevs = NULL;
> + int num = 0;
> + virDomainHostdevDefPtr detach;
> + int idx;
> + size_t i;
> + bool found = false;
> + int ret = -1;
> +
> + libxl_device_usbdev_init(&usbdev);
> +
> + idx = virDomainHostdevFind(vm->def, hostdev, &detach);
> + if (idx < 0) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("host USB device Busnum: %3x, Devnum: %3x not found"),
> + usbsrc->bus, usbsrc->device);
> + goto cleanup;
> + }
> +
> + usbdevs = libxl_device_usbdev_list(cfg->ctx, vm->def->id, &num);
> + for (i = 0; i < num; i++) {
> + if (usbdevs[i].u.hostdev.hostbus == usbsrc->bus &&
> + usbdevs[i].u.hostdev.hostaddr == usbsrc->device) {
> + libxl_device_usbdev_copy(cfg->ctx, &usbdev, &usbdevs[i]);
> + found = true;
> + break;
> + }
> + }
> + libxl_device_usbdev_list_free(usbdevs, num);
> +
> + if (!found) {
> + virReportError(VIR_ERR_OPERATION_FAILED,
> + _("host USB device Busnum: %3x, Devnum: %3x not found"),
> + usbsrc->bus, usbsrc->device);
> + goto cleanup;
> + }
> +
> + if (libxl_device_usbdev_remove(cfg->ctx, vm->def->id, &usbdev, 0) < 0) {
> + virReportError(VIR_ERR_INTERNAL_ERROR,
> + _("libxenlight failed to detach USB device\
> + Busnum: %3x, Devnum: %3x"),
> + usbsrc->bus, usbsrc->device);
> + goto cleanup;
> + }
> +
> + virDomainHostdevRemove(vm->def, idx);
> +
> + virHostdevReAttachUSBDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
> + vm->def->name, &hostdev, 1);
> +
> + ret = 0;
> +
> + cleanup:
> + virDomainHostdevDefFree(detach);
> + virObjectUnref(cfg);
> + libxl_device_usbdev_dispose(&usbdev);
> + return ret;
> +}
> +#endif
> +
> static int
> libxlDomainDetachHostDevice(libxlDriverPrivatePtr driver,
> virDomainObjPtr vm,
> @@ -3407,6 +3536,11 @@ libxlDomainDetachHostDevice(libxlDriverPrivatePtr driver,
> case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
> return libxlDomainDetachHostPCIDevice(driver, vm, hostdev);
>
> +#ifdef LIBXL_HAVE_PVUSB
> + case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB:
> + return libxlDomainDetachHostUSBDevice(driver, vm, hostdev);
> +#endif
> +
> default:
> virReportError(VIR_ERR_INTERNAL_ERROR,
> _("unexpected hostdev type %d"), subsys->type);
>
--
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