If a guest changes MAC address on its vNIC, then QEMU emits NIC_RX_FILTER_CHANGED event (the event is emitted in other cases too, but that's not important right now). Now, domain XML allows users to chose whether to trust these events or not: <interface trustGuestRxFilters='yes|no'/> For the 'no' case no action is performed and the event is ignored. But for the 'yes' case, some host side features of corresponding vNIC (well tap/macvtap device) are tweaked to reflect changed MAC address. But what is missing is reflecting this new MAC address in domain XML. Basically, what happens is: the host sees traffic with new MAC address, all tools inside the guest see the new MAC address (including 'virsh domifaddr --source agent') which makes it harder to match device in the guest with the one in the domain XML. NB, we should relay this event to clients, but that is covered in next commits. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 18 ++++++++++++++++++ src/qemu/qemu_driver.c | 2 +- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 94587638c3..5e5789a28c 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -12482,6 +12482,19 @@ syncNicRxFilterMulticast(char *ifname, } +/** + * qemuDomainSyncRxFilter: + * @vm: domain object + * @def: domain interface definition + * @asyncJob: async job type + * + * Fetch new state of RX Filter and set host side of the interface + * accordingly (e.g. reflect MAC address change on macvtap). + * + * Reflect changed MAC address in the domain definition. + * + * Returns: 0 on success, -1 on error. + */ int qemuDomainSyncRxFilter(virDomainObj *vm, virDomainNetDef *def, @@ -12535,6 +12548,11 @@ qemuDomainSyncRxFilter(virDomainObj *vm, return -1; } + /* Reflect changed MAC address in the domain XML. */ + if (virMacAddrCmp(&def->mac, &guestFilter->mac)) { + virMacAddrSet(&def->mac, &guestFilter->mac); + } + return 0; } diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index f20544590d..ccf653d201 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -3712,7 +3712,7 @@ processNicRxFilterChangedEvent(virDomainObj *vm, "from domain %p %s", devAlias, vm, vm->def->name); - if (virDomainObjBeginJob(vm, VIR_JOB_QUERY) < 0) + if (virDomainObjBeginJob(vm, VIR_JOB_MODIFY) < 0) return; if (!virDomainObjIsActive(vm)) { -- 2.39.3

On 7/26/23 16:45, Martin Kletzander wrote: You mean, even when this qemuDomainSyncRxFilter() function is not called, i.e. update MAC addr from processNicRxFilterChangedEvent()? We could do that, but this RX_FILTER_CHANGED event is a bit special. To avoid flooding libvirt with this event, there's a antispam mechanism implemented - after QEMU emits the event it awaits 'query-rx-filter' monitor cmd. No other RX_FILTER_CHANGED event is emitted until the monitor cmd is issued. IOW, if we want to refresh MAC address on each event, we must (unconditionally) issue the command and then (based on trustGuestRxFilters) sync RX filters. What I can't decide is whether it's better to reflect MAC change in domain XML iff trustGuestRxFilters is set, or regardless. Michal

The aim off this event is to notify management application that guest changed MAC address on one of its vNICs so the app can update its internal records, e.g. for finding match between guest/host view of vNICs. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- examples/c/misc/event-test.c | 14 +++++ include/libvirt/libvirt-domain.h | 28 +++++++++ src/conf/domain_event.c | 93 +++++++++++++++++++++++++++++ src/conf/domain_event.h | 12 ++++ src/libvirt_private.syms | 2 + src/remote/remote_daemon_dispatch.c | 32 ++++++++++ src/remote/remote_driver.c | 34 +++++++++++ src/remote/remote_protocol.x | 17 +++++- tools/virsh-domain-event.c | 20 +++++++ 9 files changed, 251 insertions(+), 1 deletion(-) diff --git a/examples/c/misc/event-test.c b/examples/c/misc/event-test.c index 64652b0153..1d6c47474d 100644 --- a/examples/c/misc/event-test.c +++ b/examples/c/misc/event-test.c @@ -1065,6 +1065,19 @@ myDomainEventMetadataChangeCallback(virConnectPtr conn G_GNUC_UNUSED, } +static int +myDomainEventNICMACChangeCallback(virConnectPtr conn G_GNUC_UNUSED, + virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC, + void *opaque G_GNUC_UNUSED) +{ + printf("%s EVENT: Domain %s(%d) NIC MAC changed: alias: '%s' oldMAC: '%s' newMAC: '%s'\n", + __func__, virDomainGetName(dom), virDomainGetID(dom), alias, oldMAC, newMAC); + return 0; +} + static void myFreeFunc(void *opaque) @@ -1123,6 +1136,7 @@ struct domainEventData domainEvents[] = { DOMAIN_EVENT(VIR_DOMAIN_EVENT_ID_BLOCK_THRESHOLD, myDomainEventBlockThresholdCallback), DOMAIN_EVENT(VIR_DOMAIN_EVENT_ID_MEMORY_FAILURE, myDomainEventMemoryFailureCallback), DOMAIN_EVENT(VIR_DOMAIN_EVENT_ID_MEMORY_DEVICE_SIZE_CHANGE, myDomainEventMemoryDeviceSizeChangeCallback), + DOMAIN_EVENT(VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE, myDomainEventNICMACChangeCallback), }; struct storagePoolEventData { diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h index a1902546bb..d39f2d2395 100644 --- a/include/libvirt/libvirt-domain.h +++ b/include/libvirt/libvirt-domain.h @@ -5756,6 +5756,33 @@ typedef void (*virConnectDomainEventMemoryDeviceSizeChangeCallback)(virConnectPt void *opaque); +/** + * virConnectDomainEventNICMACChangeCallback: + * @conn: connection object + * @dom: domain on which the event occurred + * @alias: network interface device alias + * @oldMAC: the old value of network interface MAC address + * @newMAC: the new value of network interface MAC address + * @opaque: application specified data + * + * The callback occurs when the guest changes MAC address on one of + * its virtual network interfaces, for QEMU domains this is emitted + * only for vNICs of model virtio. The event is not emitted for + * other types (e.g. PCI device passthrough). + * + * The callback signature to use when registering for an event of + * type VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE with + * virConnectDomainEventRegisterAny(). + * + * Since: 9.6.0 + */ +typedef void (*virConnectDomainEventNICMACChangeCallback)(virConnectPtr conn, + virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC, + void *opaque); + /** * VIR_DOMAIN_EVENT_CALLBACK: * @@ -5804,6 +5831,7 @@ typedef enum { VIR_DOMAIN_EVENT_ID_BLOCK_THRESHOLD = 24, /* virConnectDomainEventBlockThresholdCallback (Since: 3.2.0) */ VIR_DOMAIN_EVENT_ID_MEMORY_FAILURE = 25, /* virConnectDomainEventMemoryFailureCallback (Since: 6.9.0) */ VIR_DOMAIN_EVENT_ID_MEMORY_DEVICE_SIZE_CHANGE = 26, /* virConnectDomainEventMemoryDeviceSizeChangeCallback (Since: 7.9.0) */ + VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE = 27, /* virConnectDomainEventNICMACChangeCallback (Since: 9.6.0) */ # ifdef VIR_ENUM_SENTINELS VIR_DOMAIN_EVENT_ID_LAST diff --git a/src/conf/domain_event.c b/src/conf/domain_event.c index 75603a933a..4d544f2d2f 100644 --- a/src/conf/domain_event.c +++ b/src/conf/domain_event.c @@ -57,6 +57,7 @@ static virClass *virDomainEventMetadataChangeClass; static virClass *virDomainEventBlockThresholdClass; static virClass *virDomainEventMemoryFailureClass; static virClass *virDomainEventMemoryDeviceSizeChangeClass; +static virClass *virDomainEventNICMACChangeClass; static void virDomainEventDispose(void *obj); static void virDomainEventLifecycleDispose(void *obj); @@ -81,6 +82,7 @@ static void virDomainEventMetadataChangeDispose(void *obj); static void virDomainEventBlockThresholdDispose(void *obj); static void virDomainEventMemoryFailureDispose(void *obj); static void virDomainEventMemoryDeviceSizeChangeDispose(void *obj); +static void virDomainEventNICMACChangeDispose(void *obj); static void virDomainEventDispatchDefaultFunc(virConnectPtr conn, @@ -285,6 +287,15 @@ struct _virDomainEventMemoryDeviceSizeChange { }; typedef struct _virDomainEventMemoryDeviceSizeChange virDomainEventMemoryDeviceSizeChange; +struct _virDomainEventNICMACChange { + virDomainEvent parent; + + char *alias; + char *oldMAC; + char *newMAC; +}; +typedef struct _virDomainEventNICMACChange virDomainEventNICMACChange; + static int virDomainEventsOnceInit(void) { @@ -334,6 +345,8 @@ virDomainEventsOnceInit(void) return -1; if (!VIR_CLASS_NEW(virDomainEventMemoryDeviceSizeChange, virDomainEventClass)) return -1; + if (!VIR_CLASS_NEW(virDomainEventNICMACChange, virDomainEventClass)) + return -1; return 0; } @@ -559,6 +572,16 @@ virDomainEventMemoryDeviceSizeChangeDispose(void *obj) g_free(event->alias); } +static void +virDomainEventNICMACChangeDispose(void *obj) +{ + virDomainEventNICMACChange *event = obj; + + g_free(event->alias); + g_free(event->oldMAC); + g_free(event->newMAC); +} + static void * virDomainEventNew(virClass *klass, int eventID, @@ -1734,6 +1757,62 @@ virDomainEventMemoryDeviceSizeChangeNewFromDom(virDomainPtr dom, } +static virObjectEvent * +virDomainEventNICMACChangeNew(int id, + const char *name, + unsigned char *uuid, + const char *alias, + const char *oldMAC, + const char *newMAC) + +{ + virDomainEventNICMACChange *ev; + + if (virDomainEventsInitialize() < 0) + return NULL; + + if (!(ev = virDomainEventNew(virDomainEventNICMACChangeClass, + VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE, + id, name, uuid))) + return NULL; + + ev->alias = g_strdup(alias); + ev->oldMAC = g_strdup(oldMAC); + ev->newMAC = g_strdup(newMAC); + + return (virObjectEvent *)ev; +} + + +virObjectEvent * +virDomainEventNICMACChangeNewFromObj(virDomainObj *obj, + const char *alias, + const char *oldMAC, + const char *newMAC) +{ + return virDomainEventNICMACChangeNew(obj->def->id, + obj->def->name, + obj->def->uuid, + alias, + oldMAC, + newMAC); +} + +virObjectEvent * +virDomainEventNICMACChangeNewFromDom(virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC) +{ + return virDomainEventNICMACChangeNew(dom->id, + dom->name, + dom->uuid, + alias, + oldMAC, + newMAC); + +} + static void virDomainEventDispatchDefaultFunc(virConnectPtr conn, virObjectEvent *event, @@ -2042,6 +2121,20 @@ virDomainEventDispatchDefaultFunc(virConnectPtr conn, goto cleanup; } + case VIR_DOMAIN_EVENT_ID_NIC_MAC_CHANGE: + { + virDomainEventNICMACChange *nicMacChangeEvent; + + nicMacChangeEvent = (virDomainEventNICMACChange *)event; + ((virConnectDomainEventNICMACChangeCallback)cb)(conn, dom, + nicMacChangeEvent->alias, + nicMacChangeEvent->oldMAC, + nicMacChangeEvent->newMAC, + cbopaque); + + goto cleanup; + } + case VIR_DOMAIN_EVENT_ID_LAST: break; } diff --git a/src/conf/domain_event.h b/src/conf/domain_event.h index f4016dc1e9..f31cfb9e42 100644 --- a/src/conf/domain_event.h +++ b/src/conf/domain_event.h @@ -277,6 +277,18 @@ virDomainEventMemoryDeviceSizeChangeNewFromDom(virDomainPtr dom, const char *alias, unsigned long long size); +virObjectEvent * +virDomainEventNICMACChangeNewFromObj(virDomainObj *obj, + const char *alias, + const char *oldMAC, + const char *newMAC); + +virObjectEvent * +virDomainEventNICMACChangeNewFromDom(virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC); + int virDomainEventStateRegister(virConnectPtr conn, virObjectEventState *state, diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index fb7ad9c855..d5e9f321b9 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -754,6 +754,8 @@ virDomainEventMetadataChangeNewFromDom; virDomainEventMetadataChangeNewFromObj; virDomainEventMigrationIterationNewFromDom; virDomainEventMigrationIterationNewFromObj; +virDomainEventNICMACChangeNewFromDom; +virDomainEventNICMACChangeNewFromObj; virDomainEventPMSuspendDiskNewFromDom; virDomainEventPMSuspendDiskNewFromObj; virDomainEventPMSuspendNewFromDom; diff --git a/src/remote/remote_daemon_dispatch.c b/src/remote/remote_daemon_dispatch.c index 7144e9e7ca..f347e7bcce 100644 --- a/src/remote/remote_daemon_dispatch.c +++ b/src/remote/remote_daemon_dispatch.c @@ -1357,6 +1357,37 @@ remoteRelayDomainEventMemoryDeviceSizeChange(virConnectPtr conn, } +static int +remoteRelayDomainEventNICMACChange(virConnectPtr conn, + virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC, + void *opaque) +{ + daemonClientEventCallback *callback = opaque; + remote_domain_event_nic_mac_change_msg data; + + if (callback->callbackID < 0 || + !remoteRelayDomainEventCheckACL(callback->client, conn, dom)) + return -1; + + /* build return data */ + memset(&data, 0, sizeof(data)); + data.callbackID = callback->callbackID; + data.alias = g_strdup(alias); + data.oldMAC = g_strdup(oldMAC); + data.newMAC = g_strdup(newMAC); + make_nonnull_domain(&data.dom, dom); + + remoteDispatchObjectEventSend(callback->client, remoteProgram, + REMOTE_PROC_DOMAIN_EVENT_NIC_MAC_CHANGE, + (xdrproc_t)xdr_remote_domain_event_nic_mac_change_msg, + &data); + return 0; +} + + static virConnectDomainEventGenericCallback domainEventCallbacks[] = { VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventLifecycle), VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventReboot), @@ -1385,6 +1416,7 @@ static virConnectDomainEventGenericCallback domainEventCallbacks[] = { VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventBlockThreshold), VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventMemoryFailure), VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventMemoryDeviceSizeChange), + VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventNICMACChange), }; G_STATIC_ASSERT(G_N_ELEMENTS(domainEventCallbacks) == VIR_DOMAIN_EVENT_ID_LAST); diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c index 65ec239fb7..43f61321dc 100644 --- a/src/remote/remote_driver.c +++ b/src/remote/remote_driver.c @@ -427,6 +427,11 @@ remoteConnectNotifyEventConnectionClosed(virNetClientProgram *prog G_GNUC_UNUSED virNetClient *client G_GNUC_UNUSED, void *evdata, void *opaque); +static void +remoteDomainBuildEventNICMACChange(virNetClientProgram *prog, + virNetClient *client, + void *evdata, void *opaque); + static virNetClientProgramEvent remoteEvents[] = { { REMOTE_PROC_DOMAIN_EVENT_LIFECYCLE, remoteDomainBuildEventLifecycle, @@ -641,6 +646,10 @@ static virNetClientProgramEvent remoteEvents[] = { remoteDomainBuildEventMemoryDeviceSizeChange, sizeof(remote_domain_event_memory_device_size_change_msg), (xdrproc_t)xdr_remote_domain_event_memory_device_size_change_msg }, + { REMOTE_PROC_DOMAIN_EVENT_NIC_MAC_CHANGE, + remoteDomainBuildEventNICMACChange, + sizeof(remote_domain_event_nic_mac_change_msg), + (xdrproc_t)xdr_remote_domain_event_nic_mac_change_msg }, }; static void @@ -5198,6 +5207,31 @@ remoteDomainBuildEventMemoryDeviceSizeChange(virNetClientProgram *prog G_GNUC_UN } +static void +remoteDomainBuildEventNICMACChange(virNetClientProgram *prog G_GNUC_UNUSED, + virNetClient *client G_GNUC_UNUSED, + void *evdata, void *opaque) +{ + virConnectPtr conn = opaque; + remote_domain_event_nic_mac_change_msg *msg = evdata; + struct private_data *priv = conn->privateData; + virDomainPtr dom; + virObjectEvent *event = NULL; + + if (!(dom = get_nonnull_domain(conn, msg->dom))) + return; + + event = virDomainEventNICMACChangeNewFromDom(dom, + msg->alias, + msg->oldMAC, + msg->newMAC); + + virObjectUnref(dom); + + virObjectEventStateQueueRemote(priv->eventState, event, msg->callbackID); +} + + static int remoteStreamSend(virStreamPtr st, const char *data, diff --git a/src/remote/remote_protocol.x b/src/remote/remote_protocol.x index 5d86a51116..af19846668 100644 --- a/src/remote/remote_protocol.x +++ b/src/remote/remote_protocol.x @@ -3935,6 +3935,15 @@ struct remote_domain_fd_associate_args { remote_nonnull_string name; unsigned int flags; }; + +struct remote_domain_event_nic_mac_change_msg { + int callbackID; + remote_nonnull_domain dom; + remote_nonnull_string alias; + remote_nonnull_string oldMAC; + remote_nonnull_string newMAC; +}; + /*----- Protocol. -----*/ /* Define the program number, protocol version and procedure numbers here. */ @@ -6974,5 +6983,11 @@ enum remote_procedure { * @generate: none * @acl: domain:write */ - REMOTE_PROC_DOMAIN_FD_ASSOCIATE = 443 + REMOTE_PROC_DOMAIN_FD_ASSOCIATE = 443, + + /** + * @generate: both + * @acl: none + */ + REMOTE_PROC_DOMAIN_EVENT_NIC_MAC_CHANGE = 444 }; diff --git a/tools/virsh-domain-event.c b/tools/virsh-domain-event.c index 2969c22a91..2467fa00a8 100644 --- a/tools/virsh-domain-event.c +++ b/tools/virsh-domain-event.c @@ -788,6 +788,24 @@ virshEventMemoryDeviceSizeChangePrint(virConnectPtr conn G_GNUC_UNUSED, } +static void +virshEventNICMACChangePrint(virConnectPtr conn G_GNUC_UNUSED, + virDomainPtr dom, + const char *alias, + const char *oldMAC, + const char *newMAC, + void *opaque) +{ + g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER; + + virBufferAsprintf(&buf, + _("event 'nic-mac-change' for domain '%1$s':\nalias: %2$s\noldMAC: %3$s\nnewMAC: %4$s\n"), + virDomainGetName(dom), alias, oldMAC, newMAC); + + virshEventPrint(opaque, &buf); +} + + virshDomainEventCallback virshDomainEventCallbacks[] = { { "lifecycle", VIR_DOMAIN_EVENT_CALLBACK(virshEventLifecyclePrint), }, @@ -841,6 +859,8 @@ virshDomainEventCallback virshDomainEventCallbacks[] = { VIR_DOMAIN_EVENT_CALLBACK(virshEventMemoryFailurePrint), }, { "memory-device-size-change", VIR_DOMAIN_EVENT_CALLBACK(virshEventMemoryDeviceSizeChangePrint), }, + { "nic-mac-change", + VIR_DOMAIN_EVENT_CALLBACK(virshEventNICMACChangePrint), }, }; G_STATIC_ASSERT(VIR_DOMAIN_EVENT_ID_LAST == G_N_ELEMENTS(virshDomainEventCallbacks)); -- 2.39.3

On 7/26/23 16:47, Martin Kletzander wrote: Yep, you're right. This is what you get when you copy code from an event introduced earlier :-) Fixed locally. Michal