[PATCH v2 08/13] qemu: Wire up MEMORY_DEVICE_SIZE_CHANGE event

As advertised in previous commit, this event is delivered to us when virtio-mem module changes the allocation inside the guest. It comes with one attribute - size - which holds the new size of the virtio-mem (well, allocated size), in bytes. Mind you, this is not necessarily the same number as 'requested size'. It almost certainly will be when sizing the memory up, but it might not be when sizing the memory down - the guest kernel might be unable to free some blocks. This actual size is reported in the domain XML as an output element only. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- docs/formatdomain.rst | 7 ++++++ docs/schemas/domaincommon.rng | 5 +++++ src/conf/domain_conf.c | 26 ++++++++++++++++++++-- src/conf/domain_conf.h | 8 +++++++ src/libvirt_private.syms | 1 + src/qemu/qemu_domain.c | 3 +++ src/qemu/qemu_domain.h | 1 + src/qemu/qemu_driver.c | 31 ++++++++++++++++++++++++++ src/qemu/qemu_monitor.c | 24 ++++++++++++++++++++ src/qemu/qemu_monitor.h | 20 +++++++++++++++++ src/qemu/qemu_monitor_json.c | 24 ++++++++++++++++++++ src/qemu/qemu_process.c | 42 +++++++++++++++++++++++++++++++++++ 12 files changed, 190 insertions(+), 2 deletions(-) diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst index 4bd6f54657..b431361d47 100644 --- a/docs/formatdomain.rst +++ b/docs/formatdomain.rst @@ -7321,6 +7321,7 @@ Example: usage of the memory devices <node>0</node> <block unit='KiB'>2048</block> <requested unit='KiB'>1048576</requested> + <actual unit='KiB'>524288</requested> </target> </memory> </devices> @@ -7437,6 +7438,12 @@ Example: usage of the memory devices The total size exposed to the guest. Must respect ``block`` granularity and be smaller or equal to ``size``. + ``actual`` + Active XML for ``virtio-mem`` model may contain ``actual`` element that + reflects the actual size of the corresponding virtio memory device. The + element is formatted into live XML and never parsed, i.e. it is + output-only element. + :anchor:`<a id="elementsIommu"/>` IOMMU devices diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index 584c3b7bdd..b40837f75e 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -6143,6 +6143,11 @@ <ref name="scaledInteger"/> </element> </optional> + <optional> + <element name="actual"> + <ref name="scaledInteger"/> + </element> + </optional> <optional> <element name="label"> <element name="size"> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index a3313d61fe..d94af22ca6 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -17354,6 +17354,23 @@ virDomainMemoryFindByDeviceInfo(virDomainDefPtr def, } +virDomainMemoryDefPtr +virDomainMemoryFindByDeviceAlias(virDomainDefPtr def, + const char *alias) +{ + size_t i; + + for (i = 0; i < def->nmems; i++) { + virDomainMemoryDefPtr tmp = def->mems[i]; + + if (STREQ_NULLABLE(tmp->info.alias, alias)) + return tmp; + } + + return NULL; +} + + /** * virDomainMemoryInsert: * @@ -26670,7 +26687,8 @@ virDomainMemorySourceDefFormat(virBufferPtr buf, static void virDomainMemoryTargetDefFormat(virBufferPtr buf, - virDomainMemoryDefPtr def) + virDomainMemoryDefPtr def, + unsigned int flags) { g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf); @@ -26692,6 +26710,10 @@ virDomainMemoryTargetDefFormat(virBufferPtr buf, virBufferAsprintf(&childBuf, "<requested unit='KiB'>%llu</requested>\n", def->requestedsize); + if (!(flags & VIR_DOMAIN_DEF_FORMAT_INACTIVE)) { + virBufferAsprintf(&childBuf, "<actual unit='KiB'>%llu</actual>\n", + def->actualsize); + } } virXMLFormatElement(buf, "target", NULL, &childBuf); @@ -26724,7 +26746,7 @@ virDomainMemoryDefFormat(virBufferPtr buf, if (virDomainMemorySourceDefFormat(buf, def) < 0) return -1; - virDomainMemoryTargetDefFormat(buf, def); + virDomainMemoryTargetDefFormat(buf, def, flags); virDomainDeviceInfoFormat(buf, &def->info, flags); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 728e06f4ca..91805e5647 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -2332,6 +2332,9 @@ struct _virDomainMemoryDef { unsigned long long labelsize; /* kibibytes; valid only for NVDIMM */ unsigned long long blocksize; /* kibibytes; valid only for VIRTIO_MEM */ unsigned long long requestedsize; /* kibibytes; valid only for VIRTIO_MEM */ + unsigned long long actualsize; /* kibibytes, valid for VIRTIO_MEM and + active domain only, only to report never + parse */ bool readonly; /* valid only for NVDIMM */ /* required for QEMU NVDIMM ppc64 support */ @@ -3618,6 +3621,11 @@ virDomainMemoryFindByDeviceInfo(virDomainDefPtr dev, virDomainDeviceInfoPtr info) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; +virDomainMemoryDefPtr +virDomainMemoryFindByDeviceAlias(virDomainDefPtr def, + const char *alias) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; + int virDomainShmemDefInsert(virDomainDefPtr def, virDomainShmemDefPtr shmem) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT; bool virDomainShmemDefEquals(virDomainShmemDefPtr src, virDomainShmemDefPtr dst) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 41a1db7f63..df1cc1439e 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -494,6 +494,7 @@ virDomainMemballoonModelTypeFromString; virDomainMemballoonModelTypeToString; virDomainMemoryDefFree; virDomainMemoryFindByDef; +virDomainMemoryFindByDeviceAlias; virDomainMemoryFindByDeviceInfo; virDomainMemoryFindInactiveByDef; virDomainMemoryInsert; diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 6ba5df5241..b554bc622c 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -10871,6 +10871,9 @@ qemuProcessEventFree(struct qemuProcessEvent *event) case QEMU_PROCESS_EVENT_JOB_STATUS_CHANGE: virObjectUnref(event->data); break; + case QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE: + qemuMonitorMemoryDeviceSizeChangeFree(event->data); + break; case QEMU_PROCESS_EVENT_PR_DISCONNECT: case QEMU_PROCESS_EVENT_LAST: break; diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h index 7453881a31..d06ada55e6 100644 --- a/src/qemu/qemu_domain.h +++ b/src/qemu/qemu_domain.h @@ -441,6 +441,7 @@ typedef enum { QEMU_PROCESS_EVENT_PR_DISCONNECT, QEMU_PROCESS_EVENT_RDMA_GID_STATUS_CHANGED, QEMU_PROCESS_EVENT_GUEST_CRASHLOADED, + QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE, QEMU_PROCESS_EVENT_LAST } qemuProcessEventType; diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index f28813ebc5..168c65cc3f 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4279,6 +4279,34 @@ processGuestCrashloadedEvent(virQEMUDriverPtr driver, } +static void +processMemoryDeviceSizeChange(virQEMUDriverPtr driver, + virDomainObjPtr vm, + qemuMonitorMemoryDeviceSizeChangePtr info) +{ + virDomainMemoryDefPtr mem = NULL; + + if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0) + return; + + if (!virDomainObjIsActive(vm)) { + VIR_DEBUG("Domain is not running"); + goto endjob; + } + + mem = virDomainMemoryFindByDeviceAlias(vm->def, info->devAlias); + if (!mem) { + VIR_DEBUG("Memory device '%s' not found", info->devAlias); + goto endjob; + } + + mem->actualsize = VIR_DIV_UP(info->size, 1024); + + endjob: + qemuDomainObjEndJob(driver, vm); +} + + static void qemuProcessEventHandler(void *data, void *opaque) { struct qemuProcessEvent *processEvent = data; @@ -4328,6 +4356,9 @@ static void qemuProcessEventHandler(void *data, void *opaque) case QEMU_PROCESS_EVENT_GUEST_CRASHLOADED: processGuestCrashloadedEvent(driver, vm); break; + case QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE: + processMemoryDeviceSizeChange(driver, vm, processEvent->data); + break; case QEMU_PROCESS_EVENT_LAST: break; } diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index 4dcbcd197c..27bf3442f3 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1437,6 +1437,20 @@ qemuMonitorEmitSpiceMigrated(qemuMonitorPtr mon) } +int +qemuMonitorEmitMemoryDeviceSizeChange(qemuMonitorPtr mon, + const char *devAlias, + unsigned long long size) +{ + int ret = -1; + VIR_DEBUG("mon=%p, devAlias='%s', size=%llu", mon, devAlias, size); + + QEMU_MONITOR_CALLBACK(mon, ret, domainMemoryDeviceSizeChange, mon->vm, devAlias, size); + + return ret; +} + + int qemuMonitorEmitMemoryFailure(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp) @@ -4401,6 +4415,16 @@ qemuMonitorEventRdmaGidStatusFree(qemuMonitorRdmaGidStatusPtr info) } +void +qemuMonitorMemoryDeviceSizeChangeFree(qemuMonitorMemoryDeviceSizeChangePtr info) +{ + if (!info) + return; + + g_free(info->devAlias); +} + + int qemuMonitorSetWatchdogAction(qemuMonitorPtr mon, const char *action) diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index 12a4e672bd..634fda33b7 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -108,6 +108,14 @@ struct _qemuMonitorRdmaGidStatus { }; +typedef struct _qemuMonitorMemoryDeviceSizeChange qemuMonitorMemoryDeviceSizeChange; +typedef qemuMonitorMemoryDeviceSizeChange *qemuMonitorMemoryDeviceSizeChangePtr; +struct _qemuMonitorMemoryDeviceSizeChange { + char *devAlias; + unsigned long long size; +}; + + typedef enum { QEMU_MONITOR_JOB_TYPE_UNKNOWN, /* internal value, not exposed by qemu */ QEMU_MONITOR_JOB_TYPE_COMMIT, @@ -153,6 +161,7 @@ struct _qemuMonitorJobInfo { char *qemuMonitorGuestPanicEventInfoFormatMsg(qemuMonitorEventPanicInfoPtr info); void qemuMonitorEventPanicInfoFree(qemuMonitorEventPanicInfoPtr info); void qemuMonitorEventRdmaGidStatusFree(qemuMonitorRdmaGidStatusPtr info); +void qemuMonitorMemoryDeviceSizeChangeFree(qemuMonitorMemoryDeviceSizeChangePtr info); typedef void (*qemuMonitorDestroyCallback)(qemuMonitorPtr mon, virDomainObjPtr vm, @@ -374,6 +383,12 @@ typedef int (*qemuMonitorDomainMemoryFailureCallback)(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp, void *opaque); +typedef int (*qemuMonitorDomainMemoryDeviceSizeChange)(qemuMonitorPtr mon, + virDomainObjPtr vm, + const char *alias, + unsigned long long size, + void *opaque); + typedef struct _qemuMonitorCallbacks qemuMonitorCallbacks; typedef qemuMonitorCallbacks *qemuMonitorCallbacksPtr; struct _qemuMonitorCallbacks { @@ -411,6 +426,7 @@ struct _qemuMonitorCallbacks { qemuMonitorDomainRdmaGidStatusChangedCallback domainRdmaGidStatusChanged; qemuMonitorDomainGuestCrashloadedCallback domainGuestCrashloaded; qemuMonitorDomainMemoryFailureCallback domainMemoryFailure; + qemuMonitorDomainMemoryDeviceSizeChange domainMemoryDeviceSizeChange; }; qemuMonitorPtr qemuMonitorOpen(virDomainObjPtr vm, @@ -507,6 +523,10 @@ int qemuMonitorEmitSerialChange(qemuMonitorPtr mon, bool connected); int qemuMonitorEmitSpiceMigrated(qemuMonitorPtr mon); +int qemuMonitorEmitMemoryDeviceSizeChange(qemuMonitorPtr mon, + const char *devAlias, + unsigned long long size); + int qemuMonitorEmitMemoryFailure(qemuMonitorPtr mon, qemuMonitorEventMemoryFailurePtr mfp); diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 2860cc8128..f385b0027a 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -113,6 +113,7 @@ static void qemuMonitorJSONHandleDumpCompleted(qemuMonitorPtr mon, virJSONValueP static void qemuMonitorJSONHandlePRManagerStatusChanged(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleRdmaGidStatusChanged(qemuMonitorPtr mon, virJSONValuePtr data); static void qemuMonitorJSONHandleMemoryFailure(qemuMonitorPtr mon, virJSONValuePtr data); +static void qemuMonitorJSONHandleMemoryDeviceSizeChange(qemuMonitorPtr mon, virJSONValuePtr data); typedef struct { const char *type; @@ -133,6 +134,7 @@ static qemuEventHandler eventHandlers[] = { { "GUEST_CRASHLOADED", qemuMonitorJSONHandleGuestCrashloaded, }, { "GUEST_PANICKED", qemuMonitorJSONHandleGuestPanic, }, { "JOB_STATUS_CHANGE", qemuMonitorJSONHandleJobStatusChange, }, + { "MEMORY_DEVICE_SIZE_CHANGE", qemuMonitorJSONHandleMemoryDeviceSizeChange, }, { "MEMORY_FAILURE", qemuMonitorJSONHandleMemoryFailure, }, { "MIGRATION", qemuMonitorJSONHandleMigrationStatus, }, { "MIGRATION_PASS", qemuMonitorJSONHandleMigrationPass, }, @@ -1333,6 +1335,28 @@ qemuMonitorJSONHandleSpiceMigrated(qemuMonitorPtr mon, } +static void +qemuMonitorJSONHandleMemoryDeviceSizeChange(qemuMonitorPtr mon, + virJSONValuePtr data) +{ + const char *name; + unsigned long long size; + + if (!(name = virJSONValueObjectGetString(data, "id"))) { + VIR_WARN("missing device alias in MEMORY_DEVICE_SIZE_CHANGE event"); + return; + } + + if (virJSONValueObjectGetNumberUlong(data, "size", &size) < 0) { + VIR_WARN("missing new size for '%s' in MEMORY_DEVICE_SIZE_CHANGE event", name); + return; + } + + + qemuMonitorEmitMemoryDeviceSizeChange(mon, name, size); +} + + static void qemuMonitorJSONHandleMemoryFailure(qemuMonitorPtr mon, virJSONValuePtr data) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index f31570b683..73ceaaa4f1 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -1937,6 +1937,47 @@ qemuProcessHandleMemoryFailure(qemuMonitorPtr mon G_GNUC_UNUSED, } +static int +qemuProcessHandleMemoryDeviceSizeChange(qemuMonitorPtr mon G_GNUC_UNUSED, + virDomainObjPtr vm, + const char *devAlias, + unsigned long long size, + void *opaque) +{ + virQEMUDriverPtr driver = opaque; + struct qemuProcessEvent *processEvent = NULL; + qemuMonitorMemoryDeviceSizeChangePtr info = NULL; + int ret = -1; + + virObjectLock(vm); + + VIR_DEBUG("Memory device '%s' changed size to '%llu' in domain '%s'", + devAlias, size, vm->def->name); + + info = g_new0(qemuMonitorMemoryDeviceSizeChange, 1); + info->devAlias = g_strdup(devAlias); + info->size = size; + + processEvent = g_new0(struct qemuProcessEvent, 1); + processEvent->eventType = QEMU_PROCESS_EVENT_MEMORY_DEVICE_SIZE_CHANGE; + processEvent->vm = virObjectRef(vm); + processEvent->data = g_steal_pointer(&info); + + if (virThreadPoolSendJob(driver->workerPool, 0, processEvent) < 0) { + qemuProcessEventFree(processEvent); + virObjectUnref(vm); + goto cleanup; + } + + processEvent = NULL; + ret = 0; + cleanup: + qemuProcessEventFree(processEvent); + virObjectUnlock(vm); + return ret; +} + + static qemuMonitorCallbacks monitorCallbacks = { .eofNotify = qemuProcessHandleMonitorEOF, .errorNotify = qemuProcessHandleMonitorError, @@ -1970,6 +2011,7 @@ static qemuMonitorCallbacks monitorCallbacks = { .domainRdmaGidStatusChanged = qemuProcessHandleRdmaGidStatusChanged, .domainGuestCrashloaded = qemuProcessHandleGuestCrashloaded, .domainMemoryFailure = qemuProcessHandleMemoryFailure, + .domainMemoryDeviceSizeChange = qemuProcessHandleMemoryDeviceSizeChange, }; static void -- 2.26.2