If usb device attached to a domain is unplugged from host and then plugged back then it will no longer be available in guest. We are going to support this case so that device will be detached from qemu on unplug and attached back on replug. As sometimes this behaviour is not desirable and for backcompat too let's add 'replug' option for usb hostdev. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> --- docs/formatdomain.html.in | 10 ++++- docs/schemas/domaincommon.rng | 5 +++ src/conf/domain_conf.c | 30 ++++++++++++++ src/conf/domain_conf.h | 2 + tests/qemuxml2argvdata/hostdev-usb-replug.xml | 36 +++++++++++++++++ .../qemuxml2xmloutdata/hostdev-usb-replug.xml | 40 +++++++++++++++++++ tests/qemuxml2xmltest.c | 1 + 7 files changed, 122 insertions(+), 2 deletions(-) create mode 100644 tests/qemuxml2argvdata/hostdev-usb-replug.xml create mode 100644 tests/qemuxml2xmloutdata/hostdev-usb-replug.xml diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 962766b792..b95b62fea8 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -4688,7 +4688,7 @@ <pre> ... <devices> - <hostdev mode='subsystem' type='usb'> + <hostdev mode='subsystem' type='usb' replug='yes'> <source startupPolicy='optional'> <vendor id='0x1234'/> <product id='0xbeef'/> @@ -4787,7 +4787,13 @@ <dt><code>usb</code></dt> <dd>USB devices are detached from the host on guest startup and reattached after the guest exits or the device is - hot-unplugged. + hot-unplugged. If optional <code>replug</code> + (<span class="since">since 5.8.0</span>) is "yes" then libvirt + tracks USB device unplug/plug on host. On unplug the correspondent + QEMU device will be be deleted but device stays in libvirt config. + On plug the device will be added back to QEMU. This applies only + for USB devices with product/vendor pair specified. Default value + is "no". </dd> <dt><code>pci</code></dt> <dd>For PCI devices, when <code>managed</code> is "yes" it is diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index e06f892da3..051122586d 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -4668,6 +4668,11 @@ <attribute name="type"> <value>usb</value> </attribute> + <optional> + <attribute name="replug"> + <ref name="virYesNo"/> + </attribute> + </optional> <element name="source"> <optional> <ref name="startupPolicy"/> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index d5aba7336f..781764225e 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -7699,6 +7699,13 @@ virDomainHostdevSubsysUSBDefParseXML(xmlNodePtr node, goto out; } + if (usbsrc->replug && (!got_vendor || !got_product)) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("replug is only possible if vendor/product " + "pair is specified")); + goto out; + } + ret = 0; out: return ret; @@ -8139,12 +8146,14 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node, virDomainHostdevSubsysSCSIPtr scsisrc = &def->source.subsys.u.scsi; virDomainHostdevSubsysSCSIVHostPtr scsihostsrc = &def->source.subsys.u.scsi_host; virDomainHostdevSubsysMediatedDevPtr mdevsrc = &def->source.subsys.u.mdev; + virDomainHostdevSubsysUSBPtr usbsrc = &def->source.subsys.u.usb; g_autofree char *managed = NULL; g_autofree char *sgio = NULL; g_autofree char *rawio = NULL; g_autofree char *backendStr = NULL; g_autofree char *model = NULL; g_autofree char *display = NULL; + g_autofree char *replug = NULL; /* @managed can be read from the xml document - it is always an * attribute of the toplevel element, no matter what type of @@ -8160,6 +8169,7 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node, rawio = virXMLPropString(node, "rawio"); model = virXMLPropString(node, "model"); display = virXMLPropString(node, "display"); + replug = virXMLPropString(node, "replug"); /* @type is passed in from the caller rather than read from the * xml document, because it is specified in different places for @@ -8226,6 +8236,20 @@ virDomainHostdevDefParseXMLSubsys(xmlNodePtr node, } } + if (replug) { + if (def->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) { + virReportError(VIR_ERR_XML_ERROR, "%s", + _("replug is only supported for usb host device")); + return -1; + } + + if ((usbsrc->replug = virTristateBoolTypeFromString(replug)) <= 0) { + virReportError(VIR_ERR_XML_ERROR, + _("unknown hostdev replug setting '%s'"), rawio); + return -1; + } + } + if (def->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV && def->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI_HOST) { if (model) { @@ -27183,6 +27207,7 @@ virDomainHostdevDefFormat(virBufferPtr buf, virDomainHostdevSubsysSCSIPtr scsisrc = &def->source.subsys.u.scsi; virDomainHostdevSubsysMediatedDevPtr mdevsrc = &def->source.subsys.u.mdev; virDomainHostdevSubsysSCSIVHostPtr scsihostsrc = &def->source.subsys.u.scsi_host; + virDomainHostdevSubsysUSBPtr usbsrc = &def->source.subsys.u.usb; const char *type; if (!mode) { @@ -27247,6 +27272,11 @@ virDomainHostdevDefFormat(virBufferPtr buf, virTristateSwitchTypeToString(mdevsrc->display)); } + if (def->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB && + usbsrc->replug) { + virBufferAsprintf(buf, " replug='%s'", + virTristateBoolTypeToString(usbsrc->replug)); + } } virBufferAddLit(buf, ">\n"); virBufferAdjustIndent(buf, 2); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index c69d1b7ef5..f455996d1a 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -230,6 +230,8 @@ struct _virDomainHostdevSubsysUSB { unsigned vendor; unsigned product; + + bool replug; }; struct _virDomainHostdevSubsysPCI { diff --git a/tests/qemuxml2argvdata/hostdev-usb-replug.xml b/tests/qemuxml2argvdata/hostdev-usb-replug.xml new file mode 100644 index 0000000000..9647385667 --- /dev/null +++ b/tests/qemuxml2argvdata/hostdev-usb-replug.xml @@ -0,0 +1,36 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu-system-i686</emulator> + <disk type='block' device='disk'> + <driver name='qemu' type='raw'/> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'/> + <controller type='ide' index='0'/> + <controller type='pci' index='0' model='pci-root'/> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <hostdev mode='subsystem' type='usb' managed='no' replug='yes'> + <source> + <vendor id='0x1234'/> + <product id='0xbeef'/> + </source> + </hostdev> + <memballoon model='none'/> + </devices> +</domain> diff --git a/tests/qemuxml2xmloutdata/hostdev-usb-replug.xml b/tests/qemuxml2xmloutdata/hostdev-usb-replug.xml new file mode 100644 index 0000000000..5f4e39e2c4 --- /dev/null +++ b/tests/qemuxml2xmloutdata/hostdev-usb-replug.xml @@ -0,0 +1,40 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu-system-i686</emulator> + <disk type='block' device='disk'> + <driver name='qemu' type='raw'/> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> + </controller> + <controller type='ide' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> + </controller> + <controller type='pci' index='0' model='pci-root'/> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <hostdev mode='subsystem' type='usb' managed='no' replug='yes'> + <source> + <vendor id='0x1234'/> + <product id='0xbeef'/> + </source> + </hostdev> + <memballoon model='none'/> + </devices> +</domain> diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c index 89c9494e6c..b6793be908 100644 --- a/tests/qemuxml2xmltest.c +++ b/tests/qemuxml2xmltest.c @@ -437,6 +437,7 @@ mymain(void) DO_TEST("channel-unix-source-path", NONE); DO_TEST("hostdev-usb-address", NONE); + DO_TEST("hostdev-usb-replug", NONE); DO_TEST("hostdev-pci-address", NONE); DO_TEST("hostdev-pci-multifunction", NONE); DO_TEST("hostdev-vfio", NONE); -- 2.23.0

Handle host usb device unplug in DEVICE_DELETED handle execution path. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> --- src/qemu/qemu_hotplug.c | 38 +++++++++++++++++++++++++++++++------- 1 file changed, 31 insertions(+), 7 deletions(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 5770ce3482..1a5b9aa0c2 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -4397,7 +4397,8 @@ qemuDomainRemoveUSBHostDevice(virQEMUDriverPtr driver, virDomainHostdevDefPtr hostdev) { qemuHostdevReAttachUSBDevices(driver, vm->def->name, &hostdev, 1); - qemuDomainReleaseDeviceAddress(vm, hostdev->info); + if (hostdev->deleteAction != VIR_DOMAIN_HOSTDEV_DELETE_ACTION_UNPLUG) + qemuDomainReleaseDeviceAddress(vm, hostdev->info); } static void @@ -4437,6 +4438,7 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, qemuDomainObjPrivatePtr priv = vm->privateData; g_autofree char *drivealias = NULL; g_autofree char *objAlias = NULL; + bool unplug = hostdev->deleteAction == VIR_DOMAIN_HOSTDEV_DELETE_ACTION_UNPLUG; VIR_DEBUG("Removing host device %s from domain %p %s", hostdev->info->alias, vm, vm->def->name); @@ -4479,16 +4481,24 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, } } - for (i = 0; i < vm->def->nhostdevs; i++) { - if (vm->def->hostdevs[i] == hostdev) { - virDomainHostdevRemove(vm->def, i); - break; + if (!unplug) { + for (i = 0; i < vm->def->nhostdevs; i++) { + if (vm->def->hostdevs[i] == hostdev) { + virDomainHostdevRemove(vm->def, i); + break; + } } } virDomainAuditHostdev(vm, hostdev, "detach", true); - if (!virHostdevIsVFIODevice(hostdev) && + /* + * In case of unplug the attempt to restore label will fail. But we don't + * need to restore the label! In case of separate mount namespace for the + * domain we remove device file later in this function. In case of global + * mount namespace the device file is deleted or being deleted by systemd. + */ + if (!virHostdevIsVFIODevice(hostdev) && !unplug && qemuSecurityRestoreHostdevLabel(driver, vm, hostdev) < 0) VIR_WARN("Failed to restore host device labelling"); @@ -4522,7 +4532,13 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, break; } - virDomainHostdevDefFree(hostdev); + if (unplug) { + virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb; + usbsrc->bus = 0; + usbsrc->device = 0; + } else { + virDomainHostdevDefFree(hostdev); + } if (net) { if (net->type == VIR_DOMAIN_NET_TYPE_NETWORK) { @@ -4537,6 +4553,8 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, virDomainNetDefFree(net); } + hostdev->deleteAction = VIR_DOMAIN_HOSTDEV_DELETE_ACTION_NONE; + return 0; } @@ -4975,6 +4993,7 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver, virDomainDeviceInfoPtr info; virObjectEventPtr event; g_autofree char *alias = NULL; + bool unplug; /* * save the alias to use when sending a DEVICE_REMOVED event after @@ -5013,8 +5032,13 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver, return -1; break; case VIR_DOMAIN_DEVICE_HOSTDEV: + unplug = dev->data.hostdev->deleteAction == VIR_DOMAIN_HOSTDEV_DELETE_ACTION_UNPLUG; + if (qemuDomainRemoveHostDevice(driver, vm, dev->data.hostdev) < 0) return -1; + + if (unplug) + return 0; break; case VIR_DOMAIN_DEVICE_RNG: if (qemuDomainRemoveRNGDevice(driver, vm, dev->data.rng) < 0) -- 2.23.0

Now when code handling attaching/detaching usb hostdev is appropriately changed use it to handle host usb device udev add/del events. As device adding/deleting needs acquiring job condition it is done in thread pool rather in event loop thread itself where udev events are delivered. However implementation in this patch is a bit different from other places as we instead of finding right domain in event loop thread and creating a single thread pool job create job for every vm. Such a strategy allows us to avoid taking domain lock in event loop thread so we have little chances to block event loop thread because some API handler grabs domain lock for a significant amount of time. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> --- src/qemu/Makefile.inc.am | 2 + src/qemu/qemu_conf.h | 3 + src/qemu/qemu_domain.c | 2 + src/qemu/qemu_domain.h | 2 + src/qemu/qemu_driver.c | 324 ++++++++++++++++++++++++++++++++++++++- 5 files changed, 332 insertions(+), 1 deletion(-) diff --git a/src/qemu/Makefile.inc.am b/src/qemu/Makefile.inc.am index 2074a5f54f..085a41d14f 100644 --- a/src/qemu/Makefile.inc.am +++ b/src/qemu/Makefile.inc.am @@ -98,6 +98,7 @@ libvirt_driver_qemu_impl_la_CFLAGS = \ -I$(srcdir)/conf \ -I$(srcdir)/secret \ $(AM_CFLAGS) \ + $(UDEV_CFLAGS) \ $(NULL) libvirt_driver_qemu_impl_la_LDFLAGS = $(AM_LDFLAGS) libvirt_driver_qemu_impl_la_LIBADD = \ @@ -106,6 +107,7 @@ libvirt_driver_qemu_impl_la_LIBADD = \ $(LIBNL_LIBS) \ $(SELINUX_LIBS) \ $(LIBXML_LIBS) \ + $(UDEV_LIBS) \ $(NULL) libvirt_driver_qemu_impl_la_SOURCES = $(QEMU_DRIVER_SOURCES) diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h index 7247199d3e..23c9b4d9fa 100644 --- a/src/qemu/qemu_conf.h +++ b/src/qemu/qemu_conf.h @@ -299,6 +299,9 @@ struct _virQEMUDriver { /* Immutable pointer, self-locking APIs */ virHashAtomicPtr migrationErrors; + + struct udev_monitor *udev_monitor; + int udev_watch; }; virQEMUDriverConfigPtr virQEMUDriverConfigNew(bool privileged); diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 667cc89072..3d8e642625 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -15337,6 +15337,8 @@ qemuProcessEventFree(struct qemuProcessEvent *event) case QEMU_PROCESS_EVENT_SERIAL_CHANGED: case QEMU_PROCESS_EVENT_BLOCK_JOB: case QEMU_PROCESS_EVENT_MONITOR_EOF: + case QEMU_PROCESS_EVENT_USB_REMOVED: + case QEMU_PROCESS_EVENT_USB_ADDED: VIR_FREE(event->data); break; case QEMU_PROCESS_EVENT_JOB_STATUS_CHANGE: diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h index b23912ee98..9571328c5c 100644 --- a/src/qemu/qemu_domain.h +++ b/src/qemu/qemu_domain.h @@ -549,6 +549,8 @@ typedef enum { QEMU_PROCESS_EVENT_MONITOR_EOF, QEMU_PROCESS_EVENT_PR_DISCONNECT, QEMU_PROCESS_EVENT_RDMA_GID_STATUS_CHANGED, + QEMU_PROCESS_EVENT_USB_REMOVED, + QEMU_PROCESS_EVENT_USB_ADDED, QEMU_PROCESS_EVENT_LAST } qemuProcessEventType; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index d89676efc8..bcc3ff11e0 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -34,6 +34,7 @@ #include <sys/ioctl.h> #include <sys/un.h> #include <byteswap.h> +#include <libudev.h> #include "qemu_driver.h" @@ -640,6 +641,221 @@ qemuDomainFindMaxID(virDomainObjPtr vm, } +struct qemuUdevUSBRemoveData { + unsigned int bus; + unsigned int device; +}; + +struct qemuUdevUSBAddData { + unsigned int vendor; + unsigned int product; +}; + +struct qemuUdevUSBEventData { + union { + struct qemuUdevUSBRemoveData remove; + struct qemuUdevUSBAddData add; + } data; + bool remove; +}; + +static int +qemuUdevUSBHandleEvent(virDomainObjPtr vm, void *opaque) +{ + struct qemuUdevUSBEventData *data = opaque; + struct qemuProcessEvent *event = NULL; + + if (VIR_ALLOC(event) < 0) + return 0; + + if (data->remove) { + struct qemuUdevUSBRemoveData *rm_data; + + + if (VIR_ALLOC(rm_data) < 0) + goto cleanup; + + *rm_data = data->data.remove; + event->data = rm_data; + event->eventType = QEMU_PROCESS_EVENT_USB_REMOVED; + } else { + struct qemuUdevUSBAddData *add_data; + + if (VIR_ALLOC(add_data) < 0) + goto cleanup; + + *add_data = data->data.add; + event->data = add_data; + event->eventType = QEMU_PROCESS_EVENT_USB_ADDED; + } + + event->vm = virObjectRef(vm); + + if (virThreadPoolSendJob(qemu_driver->workerPool, 0, event) < 0) { + virObjectUnref(vm); + goto cleanup; + } + + event = NULL; + + cleanup: + qemuProcessEventFree(event); + + return 0; +} + + +static void +qemuUdevEventHandleCallback(int watch G_GNUC_UNUSED, + int fd G_GNUC_UNUSED, + int events G_GNUC_UNUSED, + void *data G_GNUC_UNUSED) +{ + struct qemuUdevUSBEventData event_data; + struct udev_device *dev = NULL; + const char *action; + const char *devtype; + const char *tmp; + + /* libvirtd daemon do not run event loop before full state drivers + * initialization. Also state drivers uninitialized only after + * full stop of event loop. In short driver initialization/uninitialization + * and handling events occurs in same main loop thread. Thus we + * don't need any locking here. */ + + if (!(dev = udev_monitor_receive_device(qemu_driver->udev_monitor))) { + VIR_WARNINGS_NO_WLOGICALOP_EQUAL_EXPR + if (errno == EAGAIN || errno == EWOULDBLOCK) { + VIR_WARNINGS_RESET + return; + } + + virReportSystemError(errno, "%s", + _("failed to receive device from udev monitor")); + return; + } + + devtype = udev_device_get_devtype(dev); + + if (STRNEQ_NULLABLE(devtype, "usb_device")) + goto cleanup; + + if (!(action = udev_device_get_action(dev))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to receive action from udev monitor")); + goto cleanup; + } + + if (STREQ(action, "remove")) { + struct qemuUdevUSBRemoveData *rm_data = &event_data.data.remove; + + if (!(tmp = udev_device_get_property_value(dev, "BUSNUM"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to receive busnum from udev monitor")); + goto cleanup; + } + if (virStrToLong_ui(tmp, NULL, 10, &rm_data->bus) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to convert busnum to int")); + goto cleanup; + } + + if (!(tmp = udev_device_get_property_value(dev, "DEVNUM"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to receive devnum from udev monitor")); + goto cleanup; + } + if (virStrToLong_ui(tmp, NULL, 10, &rm_data->device) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to convert devnum to int")); + goto cleanup; + } + event_data.remove = true; + } else if (STREQ(action, "add")) { + struct qemuUdevUSBAddData *add_data = &event_data.data.add; + + if (!(tmp = udev_device_get_property_value(dev, "ID_VENDOR_ID"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to receive vendor from udev monitor")); + goto cleanup; + } + if (virStrToLong_ui(tmp, NULL, 16, &add_data->vendor) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to convert vendor to int")); + goto cleanup; + } + + if (!(tmp = udev_device_get_property_value(dev, "ID_MODEL_ID"))) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to receive product from udev monitor")); + goto cleanup; + } + if (virStrToLong_ui(tmp, NULL, 16, &add_data->product) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Failed to convert product to int")); + goto cleanup; + } + event_data.remove = false; + } else { + goto cleanup; + } + + virDomainObjListForEach(qemu_driver->domains, false, qemuUdevUSBHandleEvent, &event_data); + + cleanup: + udev_device_unref(dev); +} + + +static int +qemuUdevInitialize(void) +{ + struct udev *udev; + + if (!(udev = udev_new())) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("failed to create udev context")); + return -1; + } + + if (!(qemu_driver->udev_monitor = udev_monitor_new_from_netlink(udev, "udev"))) { + udev_unref(udev); + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("udev_monitor_new_from_netlink returned NULL")); + return -1; + } + + udev_monitor_enable_receiving(qemu_driver->udev_monitor); + + qemu_driver->udev_watch = virEventAddHandle(udev_monitor_get_fd(qemu_driver->udev_monitor), + VIR_EVENT_HANDLE_READABLE, + qemuUdevEventHandleCallback, NULL, NULL); + + if (qemu_driver->udev_watch < 0) + return -1; + + return 0; +} + + +static void +qemuUdevCleanup(void) +{ + if (qemu_driver->udev_monitor) { + struct udev *udev = udev_monitor_get_udev(qemu_driver->udev_monitor); + + udev_monitor_unref(qemu_driver->udev_monitor); + udev_unref(udev); + qemu_driver->udev_monitor = NULL; + } + + if (qemu_driver->udev_watch > 0) { + virEventRemoveHandle(qemu_driver->udev_watch); + qemu_driver->udev_watch = 0; + } +} + + /** * qemuStateInitialize: * @@ -960,6 +1176,9 @@ qemuStateInitialize(bool privileged, if (!(qemu_driver->closeCallbacks = virCloseCallbacksNew())) goto error; + if (qemuUdevInitialize() < 0) + goto error; + /* Get all the running persistent or transient configs first */ if (virDomainObjListLoadAllConfigs(qemu_driver->domains, cfg->stateDir, @@ -1169,6 +1388,8 @@ qemuStateCleanup(void) virLockManagerPluginUnref(qemu_driver->lockManager); + qemuUdevCleanup(); + virMutexDestroy(&qemu_driver->lock); VIR_FREE(qemu_driver); @@ -4839,7 +5060,102 @@ processRdmaGidStatusChangedEvent(virDomainObjPtr vm, } -static void qemuProcessEventHandler(void *data, void *opaque) +static void +processUSBAddedEvent(virQEMUDriverPtr driver, + virDomainObjPtr vm, + struct qemuUdevUSBAddData *data) +{ + virDomainHostdevDefPtr hostdev; + virDomainHostdevSubsysUSBPtr usbsrc; + size_t i; + + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) + return; + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Domain is not running"); + goto cleanup; + } + + for (i = 0; i < vm->def->nhostdevs; i++) { + hostdev = vm->def->hostdevs[i]; + + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) + continue; + + usbsrc = &hostdev->source.subsys.u.usb; + + if (!usbsrc->replug) + continue; + + if (usbsrc->vendor == data->vendor && usbsrc->product == data->product) + break; + } + + if (i == vm->def->nhostdevs) + goto cleanup; + + if (qemuDomainAttachHostDevice(driver, vm, hostdev) < 0) + goto cleanup; + + cleanup: + qemuDomainObjEndJob(driver, vm); +} + + +static void +processUSBRemovedEvent(virQEMUDriverPtr driver, + virDomainObjPtr vm, + struct qemuUdevUSBRemoveData *data) +{ + size_t i; + virDomainHostdevDefPtr hostdev; + virDomainDeviceDef dev = { .type = VIR_DOMAIN_DEVICE_HOSTDEV }; + + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) + return; + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Domain is not running"); + goto cleanup; + } + + for (i = 0; i < vm->def->nhostdevs; i++) { + virDomainHostdevSubsysUSBPtr usbsrc; + + hostdev = vm->def->hostdevs[i]; + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) + continue; + + usbsrc = &hostdev->source.subsys.u.usb; + + if (!usbsrc->replug) + continue; + + /* don't mess with devices that don't use stable host addressing + * with respect to unplug/plug to host + */ + if (!usbsrc->vendor || !usbsrc->product) + continue; + + if (usbsrc->bus == data->bus && usbsrc->device == data->device) + break; + } + + if (i == vm->def->nhostdevs) + goto cleanup; + + dev.data.hostdev = hostdev; + if (qemuDomainDetachDeviceLive(vm, &dev, driver, true, true) < 0) + goto cleanup; + + cleanup: + qemuDomainObjEndJob(driver, vm); +} + + +static void +qemuProcessEventHandler(void *data, void *opaque) { struct qemuProcessEvent *processEvent = data; virDomainObjPtr vm = processEvent->vm; @@ -4885,6 +5201,12 @@ static void qemuProcessEventHandler(void *data, void *opaque) case QEMU_PROCESS_EVENT_RDMA_GID_STATUS_CHANGED: processRdmaGidStatusChangedEvent(vm, processEvent->data); break; + case QEMU_PROCESS_EVENT_USB_REMOVED: + processUSBRemovedEvent(driver, vm, processEvent->data); + break; + case QEMU_PROCESS_EVENT_USB_ADDED: + processUSBAddedEvent(driver, vm, processEvent->data); + break; case QEMU_PROCESS_EVENT_LAST: break; } -- 2.23.0

Imagine host usb device is unplugged from host and as a result we send command to qemu to delete appropriate device. Then before qemu device is deleted host usb device is plugged back. Currently code supposes there is no remnant device in qemu and will try to add new device and the attempt will fail. Instead let's check the device is not yet deleted and postpone adding qemu device to device_deleted event handler. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> --- src/qemu/qemu_driver.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index fe6b94045b..1a5bf449bf 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4474,6 +4474,44 @@ processGuestPanicEvent(virQEMUDriverPtr driver, } +static int +qemuCheckHostdevPlugged(virQEMUDriverPtr driver, + virDomainObjPtr vm, + const char *devAlias) +{ + virDomainHostdevDefPtr hostdev; + virDomainHostdevSubsysUSBPtr usbsrc; + virDomainDeviceDef dev; + int num; + + if (virDomainDefFindDevice(vm->def, devAlias, &dev, false) < 0) + return 0; + + if (dev.type != VIR_DOMAIN_DEVICE_HOSTDEV) + return 0; + + hostdev = dev.data.hostdev; + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) + return 0; + + usbsrc = &hostdev->source.subsys.u.usb; + if (!usbsrc->vendor || !usbsrc->product) + return 0; + + if ((num = virUSBDeviceFindByVendor(usbsrc->vendor, usbsrc->product, + NULL, false, NULL)) < 0) + return -1; + + if (num == 0) + return 0; + + if (qemuDomainAttachHostDevice(driver, vm, hostdev) < 0) + return -1; + + return 0; +} + + static void processDeviceDeletedEvent(virQEMUDriverPtr driver, virDomainObjPtr vm, @@ -4501,6 +4539,11 @@ processDeviceDeletedEvent(virQEMUDriverPtr driver, if (qemuDomainRemoveDevice(driver, vm, &dev) < 0) goto endjob; + + /* Fall thru and save status file even on error condition because + * device is removed successfully and changed configuration need + * to be saved in status file. */ + qemuCheckHostdevPlugged(driver, vm, devAlias); } if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm, driver->caps) < 0) @@ -5098,6 +5141,12 @@ processUSBAddedEvent(virQEMUDriverPtr driver, if (i == vm->def->nhostdevs) goto cleanup; + /* if device is not yet even deleted from qemu then handle plugging later. + * Or we failed handling host usb device unplugging, then another attempt of + * unplug/plug could help. */ + if (usbsrc->bus || usbsrc->device) + goto cleanup; + if (qemuDomainAttachHostDevice(driver, vm, hostdev) < 0) goto cleanup; -- 2.23.0

Somebody can easily unplug usb device from host while libvirtd is being stopped. Also usb device can be plugged or unplugged/plugged back and so forth. Let's handle such cases. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> --- src/qemu/qemu_process.c | 56 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index ed8666e9d1..46f04eff44 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -3726,6 +3726,59 @@ qemuProcessUpdateDevices(virQEMUDriverPtr driver, return ret; } + +static int +qemuProcessReattachUSBDevices(virQEMUDriverPtr driver, + virDomainObjPtr vm) +{ + size_t i; + + for (i = 0; i < vm->def->nhostdevs; i++) { + virDomainHostdevDefPtr hostdev = vm->def->hostdevs[i]; + virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb; + + if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB || + !usbsrc->replug) + continue; + + /* don't mess with devices that don't use stable host addressing + * with respect to unplug/plug to host + */ + if (!usbsrc->vendor || !usbsrc->product) + continue; + + if (!usbsrc->bus && !usbsrc->device) { + int num; + + if ((num = virUSBDeviceFindByVendor(usbsrc->vendor, usbsrc->product, + NULL, false, NULL)) < 0) + return -1; + + if (num > 0 && + qemuDomainAttachHostDevice(driver, vm, hostdev) < 0) + return -1; + } else { + virUSBDevicePtr usb; + + if (virUSBDeviceFindByBus(usbsrc->bus, usbsrc->device, + NULL, false, &usb) < 0) + return -1; + + if (!usb) { + virDomainDeviceDef dev = { .type = VIR_DOMAIN_DEVICE_HOSTDEV }; + + dev.data.hostdev = hostdev; + if (qemuDomainDetachDeviceLive(vm, &dev, driver, true, true) < 0) + return -1; + } + virUSBDeviceFree(usb); + } + } + + return 0; +} + + static int qemuDomainPerfRestart(virDomainObjPtr vm) { @@ -8199,6 +8252,9 @@ qemuProcessReconnect(void *opaque) if (qemuProcessUpdateDevices(driver, obj) < 0) goto error; + if (qemuProcessReattachUSBDevices(driver, obj) < 0) + goto error; + if (qemuRefreshPRManagerState(driver, obj) < 0) goto error; -- 2.23.0

If hostdev is unplugged we don't need to delete it's correspondent device from qemu etc. Just remove it from config immediately. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com> --- src/qemu/qemu_hotplug.c | 16 +++++++++++++++- src/util/virhostdev.c | 2 ++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index a2dd37f630..1e623f8763 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -4458,6 +4458,7 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, g_autofree char *drivealias = NULL; g_autofree char *objAlias = NULL; bool unplug = hostdev->deleteAction == VIR_DOMAIN_HOSTDEV_DELETE_ACTION_UNPLUG; + bool unplugged = false; VIR_DEBUG("Removing host device %s from domain %p %s", hostdev->info->alias, vm, vm->def->name); @@ -4511,13 +4512,17 @@ qemuDomainRemoveHostDevice(virQEMUDriverPtr driver, virDomainAuditHostdev(vm, hostdev, "detach", true); + if (hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB) { + virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb; + unplugged = !usbsrc->bus && !usbsrc->device; + } /* * In case of unplug the attempt to restore label will fail. But we don't * need to restore the label! In case of separate mount namespace for the * domain we remove device file later in this function. In case of global * mount namespace the device file is deleted or being deleted by systemd. */ - if (!virHostdevIsVFIODevice(hostdev) && !unplug && + if (!virHostdevIsVFIODevice(hostdev) && !unplug && !unplugged && qemuSecurityRestoreHostdevLabel(driver, vm, hostdev) < 0) VIR_WARN("Failed to restore host device labelling"); @@ -5821,6 +5826,15 @@ qemuDomainDetachDeviceLive(virDomainObjPtr vm, unplug) < 0) { return -1; } + if (!unplug) { + virDomainHostdevDefPtr hostdev = detach.data.hostdev; + virDomainHostdevSubsysUSBPtr usbsrc = &hostdev->source.subsys.u.usb; + + if (hostdev->startupPolicy != VIR_DOMAIN_STARTUP_POLICY_OPTIONAL && + hostdev->startupPolicy != VIR_DOMAIN_STARTUP_POLICY_REQUISITE && + usbsrc->device == 0 && usbsrc->bus == 0) + return qemuDomainRemoveDevice(driver, vm, &detach); + } break; case VIR_DOMAIN_DEVICE_RNG: if (qemuDomainDetachPrepRNG(vm, match->data.rng, diff --git a/src/util/virhostdev.c b/src/util/virhostdev.c index 010eb551a9..c28633921b 100644 --- a/src/util/virhostdev.c +++ b/src/util/virhostdev.c @@ -1807,6 +1807,8 @@ virHostdevReAttachUSBDevices(virHostdevManagerPtr mgr, continue; if (hostdev->missing) continue; + if (!usbsrc->bus && !usbsrc->device) + continue; if (!(usb = virUSBDeviceNew(usbsrc->bus, usbsrc->device, NULL))) { VIR_WARN("Unable to reattach USB device %03d.%03d on domain %s", -- 2.23.0