[PATCH v3 07/14] qemu: Wire up <memory/> live update
Michal Privoznik
mprivozn at redhat.com
Fri Apr 23 13:24:29 UTC 2021
As advertised in one of previous commits, we want to be able to
change 'requested-size' attribute of virtio-mem on the fly. This
commit does exactly that. Changing anything else is checked for
and forbidden.
Once guest has changed the allocation, QEMU emits an event which
we will use to track the allocation. In the next commit.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/conf/domain_conf.c | 36 ++++++++
src/conf/domain_conf.h | 4 +
src/libvirt_private.syms | 1 +
src/qemu/qemu_driver.c | 172 ++++++++++++++++++++++++++++++++++-
src/qemu/qemu_hotplug.c | 18 ++++
src/qemu/qemu_hotplug.h | 5 +
src/qemu/qemu_monitor.c | 13 +++
src/qemu/qemu_monitor.h | 5 +
src/qemu/qemu_monitor_json.c | 15 +++
src/qemu/qemu_monitor_json.h | 5 +
10 files changed, 273 insertions(+), 1 deletion(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 240bcfa020..e75c5c9dcd 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -17384,6 +17384,42 @@ virDomainMemoryFindInactiveByDef(virDomainDef *def,
}
+/**
+ * virDomainMemoryFindByDeviceInfo:
+ * @def: domain defintion
+ * @info: device info to match
+ *
+ * For given domain definition @def find <memory/> device with
+ * matching address and matching device alias (if set in @info,
+ * otherwise ignored).
+ *
+ * Returns: device if found,
+ * NULL otherwise.
+ */
+virDomainMemoryDef *
+virDomainMemoryFindByDeviceInfo(virDomainDef *def,
+ virDomainDeviceInfo *info)
+{
+ size_t i;
+
+ for (i = 0; i < def->nmems; i++) {
+ virDomainMemoryDef *tmp = def->mems[i];
+
+ if (!virDomainDeviceInfoAddressIsEqual(&tmp->info, info))
+ continue;
+
+ /* alias, if present */
+ if (info->alias &&
+ STRNEQ_NULLABLE(tmp->info.alias, info->alias))
+ continue;
+
+ return tmp;
+ }
+
+ return NULL;
+}
+
+
/**
* virDomainMemoryInsert:
*
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 884e2c4d17..4fc864b1eb 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3757,6 +3757,10 @@ int virDomainMemoryFindByDef(virDomainDef *def, virDomainMemoryDef *mem)
int virDomainMemoryFindInactiveByDef(virDomainDef *def,
virDomainMemoryDef *mem)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
+virDomainMemoryDef *
+virDomainMemoryFindByDeviceInfo(virDomainDef *dev,
+ virDomainDeviceInfo *info)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
int virDomainShmemDefInsert(virDomainDef *def, virDomainShmemDef *shmem)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 1a3295b111..66af60a775 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -502,6 +502,7 @@ virDomainMemballoonModelTypeFromString;
virDomainMemballoonModelTypeToString;
virDomainMemoryDefFree;
virDomainMemoryFindByDef;
+virDomainMemoryFindByDeviceInfo;
virDomainMemoryFindInactiveByDef;
virDomainMemoryInsert;
virDomainMemoryModelTypeToString;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index d908e95ba7..9a241ad551 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7130,6 +7130,165 @@ qemuDomainChangeDiskLive(virDomainObj *vm,
return 0;
}
+
+static bool
+qemuDomainChangeMemoryLiveValidateChange(const virDomainMemoryDef *oldDef,
+ const virDomainMemoryDef *newDef)
+{
+ /* The only thing that is allowed to change is 'requestedsize' for virtio
+ * model. */
+ if (oldDef->model != newDef->model) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory model from '%s' to '%s'"),
+ virDomainMemoryModelTypeToString(oldDef->model),
+ virDomainMemoryModelTypeToString(newDef->model));
+ return false;
+ }
+
+ if (oldDef->access != newDef->access) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory access from '%s' to '%s'"),
+ virDomainMemoryAccessTypeToString(oldDef->access),
+ virDomainMemoryAccessTypeToString(newDef->access));
+ return false;
+ }
+
+ if (oldDef->discard != newDef->discard) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory discard from '%s' to '%s'"),
+ virTristateBoolTypeToString(oldDef->discard),
+ virTristateBoolTypeToString(newDef->discard));
+ return false;
+ }
+
+ if (!virBitmapEqual(oldDef->sourceNodes,
+ newDef->sourceNodes)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("cannot modify memory source nodes"));
+ return false;
+ }
+
+ if (oldDef->pagesize != newDef->pagesize) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory pagesize from '%llu' to '%llu'"),
+ oldDef->pagesize,
+ newDef->pagesize);
+ return false;
+ }
+
+ if (STRNEQ_NULLABLE(oldDef->nvdimmPath, newDef->nvdimmPath)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory path from '%s' to '%s'"),
+ NULLSTR(oldDef->nvdimmPath),
+ NULLSTR(newDef->nvdimmPath));
+ return false;
+ }
+
+ if (oldDef->alignsize != newDef->alignsize) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory align size from '%llu' to '%llu'"),
+ oldDef->alignsize, newDef->alignsize);
+ return false;
+ }
+
+ if (oldDef->nvdimmPmem != newDef->nvdimmPmem) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory pmem from '%d' to '%d'"),
+ oldDef->nvdimmPmem, newDef->nvdimmPmem);
+ return false;
+ }
+
+ if (oldDef->targetNode != newDef->targetNode) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory targetNode from '%d' to '%d'"),
+ oldDef->targetNode, newDef->targetNode);
+ return false;
+ }
+
+ if (oldDef->size != newDef->size) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory size from '%llu' to '%llu'"),
+ oldDef->size, newDef->size);
+ return false;
+ }
+
+ if (oldDef->labelsize != newDef->labelsize) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory label size from '%llu' to '%llu'"),
+ oldDef->labelsize, newDef->labelsize);
+ return false;
+ }
+ if (oldDef->blocksize != newDef->blocksize) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory block size from '%llu' to '%llu'"),
+ oldDef->blocksize, newDef->blocksize);
+ return false;
+ }
+
+ /* requestedsize can change */
+
+ if (oldDef->readonly != newDef->readonly) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("cannot modify memory pmem flag"));
+ return false;
+ }
+
+ if ((oldDef->uuid || newDef->uuid) &&
+ !(oldDef->uuid && newDef->uuid &&
+ memcmp(oldDef->uuid, newDef->uuid, VIR_UUID_BUFLEN) == 0)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("cannot modify memory UUID"));
+ return false;
+ }
+
+ switch (oldDef->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_MEM:
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_VIRTIO_PMEM:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("cannot modify memory of model '%s'"),
+ virDomainMemoryModelTypeToString(oldDef->model));
+ return false;
+ break;
+ }
+
+ return true;
+}
+
+
+static int
+qemuDomainChangeMemoryLive(virQEMUDriver *driver G_GNUC_UNUSED,
+ virDomainObj *vm,
+ virDomainDeviceDef *dev)
+{
+ virDomainMemoryDef *newDef = dev->data.memory;
+ virDomainMemoryDef *oldDef = NULL;
+
+ oldDef = virDomainMemoryFindByDeviceInfo(vm->def, &dev->data.memory->info);
+ if (!oldDef) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("memory '%s' not found"), dev->data.memory->info.alias);
+ return -1;
+ }
+
+ if (!qemuDomainChangeMemoryLiveValidateChange(oldDef, newDef))
+ return -1;
+
+ if (qemuDomainChangeMemoryRequestedSize(driver, vm,
+ newDef->info.alias,
+ newDef->requestedsize) < 0)
+ return -1;
+
+ oldDef->requestedsize = newDef->requestedsize;
+ return 0;
+}
+
+
static int
qemuDomainUpdateDeviceLive(virDomainObj *vm,
virDomainDeviceDef *dev,
@@ -7171,6 +7330,18 @@ qemuDomainUpdateDeviceLive(virDomainObj *vm,
ret = qemuDomainChangeNet(driver, vm, dev);
break;
+ case VIR_DOMAIN_DEVICE_MEMORY:
+ oldDev.data.memory = virDomainMemoryFindByDeviceInfo(vm->def, &dev->data.memory->info);
+ if (oldDev.data.memory) {
+ if (virDomainDefCompatibleDevice(vm->def, dev, &oldDev,
+ VIR_DOMAIN_DEVICE_ACTION_UPDATE,
+ true) < 0)
+ return -1;
+ }
+
+ ret = qemuDomainChangeMemoryLive(driver, vm, dev);
+ break;
+
case VIR_DOMAIN_DEVICE_FS:
case VIR_DOMAIN_DEVICE_INPUT:
case VIR_DOMAIN_DEVICE_SOUND:
@@ -7186,7 +7357,6 @@ qemuDomainUpdateDeviceLive(virDomainObj *vm,
case VIR_DOMAIN_DEVICE_HOSTDEV:
case VIR_DOMAIN_DEVICE_CONTROLLER:
case VIR_DOMAIN_DEVICE_REDIRDEV:
- case VIR_DOMAIN_DEVICE_MEMORY:
case VIR_DOMAIN_DEVICE_CHR:
case VIR_DOMAIN_DEVICE_NONE:
case VIR_DOMAIN_DEVICE_TPM:
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 4344edc75b..1ac055bd6c 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -6704,3 +6704,21 @@ qemuDomainSetVcpuInternal(virQEMUDriver *driver,
virBitmapFree(livevcpus);
return ret;
}
+
+
+int
+qemuDomainChangeMemoryRequestedSize(virQEMUDriver *driver,
+ virDomainObj *vm,
+ const char *alias,
+ unsigned long long requestedsize)
+{
+ qemuDomainObjPrivate *priv = vm->privateData;
+ int rc;
+
+ qemuDomainObjEnterMonitor(driver, vm);
+ rc = qemuMonitorChangeMemoryRequestedSize(priv->mon, alias, requestedsize);
+ if (qemuDomainObjExitMonitor(driver, vm) < 0)
+ return -1;
+
+ return rc;
+}
diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
index df8f76f8d6..c8a9e5ebbb 100644
--- a/src/qemu/qemu_hotplug.h
+++ b/src/qemu/qemu_hotplug.h
@@ -160,3 +160,8 @@ int qemuHotplugAttachDBusVMState(virQEMUDriver *driver,
int qemuHotplugRemoveDBusVMState(virQEMUDriver *driver,
virDomainObj *vm,
qemuDomainAsyncJob asyncJob);
+
+int qemuDomainChangeMemoryRequestedSize(virQEMUDriver *driver,
+ virDomainObj *vm,
+ const char *alias,
+ unsigned long long requestedsize);
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index f3f14c46b6..c5793a8238 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -4781,3 +4781,16 @@ qemuMonitorQueryDirtyRate(qemuMonitor *mon,
return qemuMonitorJSONQueryDirtyRate(mon, info);
}
+
+
+int
+qemuMonitorChangeMemoryRequestedSize(qemuMonitor *mon,
+ const char *alias,
+ unsigned long long requestedsize)
+{
+ VIR_DEBUG("alias=%s requestedsize=%llu", alias, requestedsize);
+
+ QEMU_CHECK_MONITOR(mon);
+
+ return qemuMonitorJSONChangeMemoryRequestedSize(mon, alias, requestedsize);
+}
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 230d00a894..8d27a7e3fb 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -1503,3 +1503,8 @@ struct _qemuMonitorDirtyRateInfo {
int
qemuMonitorQueryDirtyRate(qemuMonitor *mon,
qemuMonitorDirtyRateInfo *info);
+
+int
+qemuMonitorChangeMemoryRequestedSize(qemuMonitor *mon,
+ const char *alias,
+ unsigned long long requestedsize);
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 652034472a..e2f68e838b 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -9568,3 +9568,18 @@ qemuMonitorJSONQueryDirtyRate(qemuMonitor *mon,
return qemuMonitorJSONExtractDirtyRateInfo(data, info);
}
+
+
+int
+qemuMonitorJSONChangeMemoryRequestedSize(qemuMonitor *mon,
+ const char *alias,
+ unsigned long long requestedsize)
+{
+ g_autofree char *path = g_strdup_printf("/machine/peripheral/%s", alias);
+ qemuMonitorJSONObjectProperty prop = {
+ .type = QEMU_MONITOR_OBJECT_PROPERTY_ULONG,
+ .val.ul = requestedsize * 1024, /* monitor needs bytes */
+ };
+
+ return qemuMonitorJSONSetObjectProperty(mon, path, "requested-size", &prop);
+}
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 0846325a81..28280ca333 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -716,3 +716,8 @@ qemuMonitorJSONStartDirtyRateCalc(qemuMonitor *mon,
int
qemuMonitorJSONQueryDirtyRate(qemuMonitor *mon,
qemuMonitorDirtyRateInfo *info);
+
+int
+qemuMonitorJSONChangeMemoryRequestedSize(qemuMonitor *mon,
+ const char *alias,
+ unsigned long long requestedsize);
--
2.26.3
More information about the libvir-list
mailing list