[PATCH v3 08/15] qemu: Wire up MEMORY_DEVICE_SIZE_CHANGE event
Michal Privoznik
mprivozn at redhat.com
Wed Mar 17 11:57:18 UTC 2021
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 at redhat.com>
---
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 a09ea68888..80adda5b6e 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -7683,6 +7683,7 @@ 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>
@@ -7798,6 +7799,12 @@ 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 a1e3d96724..4ce0fdcd49 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -6502,6 +6502,11 @@
<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 f6d071dc17..c6efc26357 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -17849,6 +17849,23 @@ 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:
*
@@ -27328,7 +27345,8 @@ virDomainMemorySourceDefFormat(virBufferPtr buf,
static void
virDomainMemoryTargetDefFormat(virBufferPtr buf,
- virDomainMemoryDefPtr def)
+ virDomainMemoryDefPtr def,
+ unsigned int flags)
{
g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf);
@@ -27350,6 +27368,10 @@ 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);
@@ -27382,7 +27404,7 @@ 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 169887e1a8..e3a0d19e4f 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2454,6 +2454,9 @@ 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 */
@@ -3746,6 +3749,11 @@ 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 a317992f1e..038b17ce08 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -499,6 +499,7 @@ virDomainMemballoonModelTypeFromString;
virDomainMemballoonModelTypeToString;
virDomainMemoryDefFree;
virDomainMemoryFindByDef;
+virDomainMemoryFindByDeviceAlias;
virDomainMemoryFindByDeviceInfo;
virDomainMemoryFindInactiveByDef;
virDomainMemoryInsert;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index bfecbdcfb4..621ae3b694 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -11058,6 +11058,9 @@ 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 949307229b..3d693d840d 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 c055fc6e55..006c8fd1a4 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4316,6 +4316,34 @@ 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;
@@ -4365,6 +4393,9 @@ 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 7e7d2a376e..6f05a0eaab 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -1444,6 +1444,20 @@ 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)
@@ -4416,6 +4430,16 @@ 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 51c5732c93..4c352125c9 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 78519bcd57..ba1c63a37b 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, },
@@ -1329,6 +1331,28 @@ 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 6eb61f5667..eb9fab8e9a 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -1940,6 +1940,47 @@ 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,
@@ -1973,6 +2014,7 @@ static qemuMonitorCallbacks monitorCallbacks = {
.domainRdmaGidStatusChanged = qemuProcessHandleRdmaGidStatusChanged,
.domainGuestCrashloaded = qemuProcessHandleGuestCrashloaded,
.domainMemoryFailure = qemuProcessHandleMemoryFailure,
+ .domainMemoryDeviceSizeChange = qemuProcessHandleMemoryDeviceSizeChange,
};
static void
--
2.26.2
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