[PATCH v2 23/27] qemu: Wire up MEMORY_DEVICE_SIZE_CHANGE event
Michal Privoznik
mprivozn at redhat.com
Thu Dec 3 12:36:26 UTC 2020
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 | 24 ++++++++-
src/conf/domain_conf.h | 7 +++
src/libvirt_private.syms | 1 +
src/qemu/qemu_domain.c | 3 ++
src/qemu/qemu_domain.h | 1 +
src/qemu/qemu_driver.c | 36 +++++++++++++
src/qemu/qemu_monitor.c | 24 +++++++++
src/qemu/qemu_monitor.h | 20 ++++++++
src/qemu/qemu_monitor_json.c | 24 +++++++++
src/qemu/qemu_process.c | 96 +++++++++++++++++++++++++++++++----
12 files changed, 236 insertions(+), 12 deletions(-)
diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index 3990728939..ac87d03b33 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -7196,6 +7196,7 @@ Example: usage of the memory devices
<node>0</node>
<block unit='KiB'>2048</block>
<requested unit='KiB'>524288</requested>
+ <actual unit='KiB'>524288</requested>
</target>
</memory>
<memory model='virtio' access='shared'>
@@ -7322,6 +7323,12 @@ Example: usage of the memory devices
granularity. This is valid for ``virtio`` model only and mutually
exclusive with ``pmem``.
+ ``actual``
+ The active XML for a ``virtio`` 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 d478b639fa..3b12902e04 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -6063,6 +6063,11 @@
<ref name="scaledInteger"/>
</element>
</optional>
+ <optional>
+ <element name="actual">
+ <ref name="scaledInteger"/>
+ </element>
+ </optional>
<optional>
<element name="node">
<ref name="unsignedInt"/>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a4293f1749..8adb3e99e2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -18785,6 +18785,21 @@ virDomainMemoryFindByDeviceInfo(virDomainDefPtr def,
}
+ssize_t
+virDomainMemoryFindByDeviceAlias(virDomainDefPtr def,
+ const char *alias)
+{
+ size_t i;
+
+ for (i = 0; i < def->nmems; i++) {
+ if (STREQ_NULLABLE(def->mems[i]->info.alias, alias))
+ return i;
+ }
+
+ return -1;
+}
+
+
/**
* virDomainMemoryInsert:
*
@@ -28086,7 +28101,8 @@ virDomainMemorySourceDefFormat(virBufferPtr buf,
static void
virDomainMemoryTargetDefFormat(virBufferPtr buf,
- virDomainMemoryDefPtr def)
+ virDomainMemoryDefPtr def,
+ unsigned int flags)
{
g_auto(virBuffer) childBuf = VIR_BUFFER_INIT_CHILD(buf);
@@ -28108,6 +28124,10 @@ 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);
@@ -28142,7 +28162,7 @@ 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 d0814d7639..f8d86d704e 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2342,6 +2342,9 @@ struct _virDomainMemoryDef {
unsigned long long labelsize; /* kibibytes; valid only for NVDIMM */
unsigned long long blocksize; /* kibibytes, valid for virtio-mem only */
unsigned long long requestedsize; /* kibibytes, valid for virtio-mem only */
+ 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 */
@@ -3588,6 +3591,10 @@ ssize_t virDomainMemoryFindByDeviceInfo(virDomainDefPtr dev,
virDomainDeviceInfoPtr info)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
+ssize_t 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 7014d602b6..1d800087fc 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -497,6 +497,7 @@ virDomainMemballoonModelTypeFromString;
virDomainMemballoonModelTypeToString;
virDomainMemoryDefFree;
virDomainMemoryFindByDef;
+virDomainMemoryFindByDeviceAlias;
virDomainMemoryFindByDeviceInfo;
virDomainMemoryFindInactiveByDef;
virDomainMemoryInsert;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index ab7938a355..fc994ec282 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -10554,6 +10554,9 @@ 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 010bae285d..376679da77 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 edc109cb28..3d2d6bc1eb 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4284,6 +4284,39 @@ processGuestCrashloadedEvent(virQEMUDriverPtr driver,
}
+static void
+processMemoryDeviceSizeChange(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ qemuMonitorMemoryDeviceSizeChangePtr info)
+{
+ virDomainMemoryDefPtr mem = NULL;
+ ssize_t idx;
+
+ if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
+ return;
+
+ if (!virDomainObjIsActive(vm)) {
+ VIR_DEBUG("Domain is not running");
+ goto endjob;
+ }
+
+ idx = virDomainMemoryFindByDeviceAlias(vm->def, info->devAlias);
+ if (idx < 0) {
+ VIR_DEBUG("Memory device '%s' not found", info->devAlias);
+ goto endjob;
+ }
+
+ mem = vm->def->mems[idx];
+ mem->actualsize = VIR_DIV_UP(info->size, 1024);
+
+ /* fix the balloon size */
+ ignore_value(qemuProcessRefreshBalloonState(driver, vm, QEMU_ASYNC_JOB_NONE));
+
+ endjob:
+ qemuDomainObjEndJob(driver, vm);
+}
+
+
static void qemuProcessEventHandler(void *data, void *opaque)
{
struct qemuProcessEvent *processEvent = data;
@@ -4333,6 +4366,9 @@ 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 0e2cc0b76c..e8a9788011 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -1417,6 +1417,20 @@ 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)
@@ -4420,6 +4434,16 @@ qemuMonitorEventRdmaGidStatusFree(qemuMonitorRdmaGidStatusPtr info)
}
+void
+qemuMonitorMemoryDeviceSizeChangeFree(qemuMonitorMemoryDeviceSizeChangePtr info)
+{
+ if (!info)
+ return;
+
+ VIR_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 3005adc1e0..2f9184c122 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 4046d0b3b0..3fd925eae1 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, },
@@ -1335,6 +1337,28 @@ 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 8ea7e0df05..1fba9d8302 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -1248,10 +1248,30 @@ qemuProcessHandleBalloonChange(qemuMonitorPtr mon G_GNUC_UNUSED,
virQEMUDriverPtr driver = opaque;
virObjectEventPtr event = NULL;
g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver);
+ size_t i;
virObjectLock(vm);
event = virDomainEventBalloonChangeNewFromObj(vm, actual);
+ VIR_DEBUG("New balloon size before fixup: %lld", actual);
+
+ for (i = 0; i < vm->def->nmems; i++) {
+ virDomainMemoryDefPtr mem = vm->def->mems[i];
+
+ switch (mem->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_VIRTIO:
+ actual += mem->actualsize;
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ /* nada */
+ break;
+ }
+ }
+
VIR_DEBUG("Updating balloon from %lld to %lld kb",
vm->def->mem.cur_balloon, actual);
vm->def->mem.cur_balloon = actual;
@@ -1932,6 +1952,46 @@ 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;
+ }
+
+ ret = 0;
+ cleanup:
+ qemuMonitorMemoryDeviceSizeChangeFree(info);
+ virObjectUnlock(vm);
+ return ret;
+}
+
+
static qemuMonitorCallbacks monitorCallbacks = {
.eofNotify = qemuProcessHandleMonitorEOF,
.errorNotify = qemuProcessHandleMonitorError,
@@ -1965,6 +2025,7 @@ static qemuMonitorCallbacks monitorCallbacks = {
.domainRdmaGidStatusChanged = qemuProcessHandleRdmaGidStatusChanged,
.domainGuestCrashloaded = qemuProcessHandleGuestCrashloaded,
.domainMemoryFailure = qemuProcessHandleMemoryFailure,
+ .domainMemoryDeviceSizeChange = qemuProcessHandleMemoryDeviceSizeChange,
};
static void
@@ -2405,21 +2466,36 @@ qemuProcessRefreshBalloonState(virQEMUDriverPtr driver,
int asyncJob)
{
unsigned long long balloon;
+ size_t i;
int rc;
- /* if no ballooning is available, the current size equals to the current
- * full memory size */
- if (!virDomainDefHasMemballoon(vm->def)) {
- vm->def->mem.cur_balloon = virDomainDefGetMemoryTotal(vm->def);
- return 0;
+ if (virDomainDefHasMemballoon(vm->def)) {
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+ return -1;
+
+ rc = qemuMonitorGetBalloonInfo(qemuDomainGetMonitor(vm), &balloon);
+ if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
+ return -1;
+ } else {
+ balloon = virDomainDefGetMemoryTotal(vm->def);
}
- if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
- return -1;
+ for (i = 0; i < vm->def->nmems; i++) {
+ virDomainMemoryDefPtr mem = vm->def->mems[i];
+
+ switch (mem->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_VIRTIO:
+ balloon += mem->actualsize;
+ break;
- rc = qemuMonitorGetBalloonInfo(qemuDomainGetMonitor(vm), &balloon);
- if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
- return -1;
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ /* nada */
+ break;
+ }
+ }
vm->def->mem.cur_balloon = balloon;
--
2.26.2
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