9:20 a.m.
Add code to hot-add memory devices to running qemu instances.
---
Notes:
Version 3:
- added comment to clarify that @mem is always consumed by qemuDomainAttachMemory
Version 2:
- no change
Version 2:
- no change
src/qemu/qemu_command.c | 4 +--
src/qemu/qemu_command.h | 15 ++++++++
src/qemu/qemu_driver.c | 5 ++-
src/qemu/qemu_hotplug.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_hotplug.h | 3 ++
5 files changed, 119 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 2d85567..1f72437 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4599,7 +4599,7 @@ qemuBuildControllerDevStr(virDomainDefPtr domainDef,
* other configuration was used (to detect legacy configurations). Returns
* -1 in case of an error.
*/
-static int
+int
qemuBuildMemoryBackendStr(unsigned long long size,
unsigned long long pagesize,
int guestNode,
@@ -4872,7 +4872,7 @@ qemuBuildMemoryDimmBackendStr(virDomainMemoryDefPtr mem,
}
-static char *
+char *
qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
virQEMUCapsPtr qemuCaps)
{
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index ee81f92..a29db41 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -162,6 +162,21 @@ char *qemuBuildSoundDevStr(virDomainDefPtr domainDef,
virDomainSoundDefPtr sound,
virQEMUCapsPtr qemuCaps);
+int qemuBuildMemoryBackendStr(unsigned long long size,
+ unsigned long long pagesize,
+ int guestNode,
+ virBitmapPtr userNodeset,
+ virBitmapPtr autoNodeset,
+ virDomainDefPtr def,
+ virQEMUCapsPtr qemuCaps,
+ virQEMUDriverConfigPtr cfg,
+ const char **backendType,
+ virJSONValuePtr *backendProps,
+ bool force);
+
+char *qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
+ virQEMUCapsPtr qemuCaps);
+
/* Legacy, pre device support */
char *qemuBuildPCIHostdevPCIDevStr(virDomainHostdevDefPtr dev,
virQEMUCapsPtr qemuCaps);
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index e948cca..cbdf279 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7649,8 +7649,11 @@ qemuDomainAttachDeviceLive(virDomainObjPtr vm,
dev->data.rng = NULL;
break;
- /*TODO: implement later */
case VIR_DOMAIN_DEVICE_MEMORY:
+ ret = qemuDomainAttachMemory(driver, vm,
+ dev->data.memory);
+ dev->data.memory = NULL;
+ break;
case VIR_DOMAIN_DEVICE_NONE:
case VIR_DOMAIN_DEVICE_FS:
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 5c5ad0e..88c5e3c 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1672,6 +1672,101 @@ qemuDomainAttachRNGDevice(virQEMUDriverPtr driver,
}
+/**
+ * qemuDomainAttachMemory:
+ * @driver: qemu driver data
+ * @vm: VM object
+ * @mem: Definition of the memory device to be attached. @mem is always consumed
+ *
+ * Attaches memory device described by @mem to domain @vm.
+ *
+ * Returns 0 on success -1 on error.
+ */
+int
+qemuDomainAttachMemory(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainMemoryDefPtr mem)
+{
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+ char *devstr = NULL;
+ char *objalias = NULL;
+ const char *backendType;
+ virJSONValuePtr props = NULL;
+ int id;
+ int ret = -1;
+
+ if (virAsprintf(&mem->info.alias, "dimm%zu", vm->def->nmems)
< 0)
+ goto cleanup;
+
+ if (virAsprintf(&objalias, "mem%s", mem->info.alias) < 0)
+ goto cleanup;
+
+ if (!(devstr = qemuBuildMemoryDeviceStr(mem, priv->qemuCaps)))
+ goto cleanup;
+
+ qemuDomainMemoryDeviceAlignSize(mem);
+
+ if (qemuBuildMemoryBackendStr(mem->size, mem->pagesize,
+ mem->targetNode, mem->sourceNodes, NULL,
+ vm->def, priv->qemuCaps, cfg,
+ &backendType, &props, true) < 0)
+ goto cleanup;
+
+ if (virDomainMemoryInsert(vm->def, mem) < 0) {
+ virJSONValueFree(props);
+ goto cleanup;
+ }
+
+ qemuDomainObjEnterMonitor(driver, vm);
+ if (qemuMonitorAddObject(priv->mon, backendType, objalias, props) < 0)
+ goto removedef;
+
+ if (qemuMonitorAddDevice(priv->mon, devstr) < 0) {
+ virErrorPtr err = virSaveLastError();
+ ignore_value(qemuMonitorDelObject(priv->mon, objalias));
+ virSetError(err);
+ virFreeError(err);
+ goto removedef;
+ }
+
+ if (qemuDomainObjExitMonitor(driver, vm) < 0) {
+ /* we shouldn't touch mem now, as the def might be freed */
+ mem = NULL;
+ goto cleanup;
+ }
+
+ /* mem is consumed by vm->def */
+ mem = NULL;
+
+ /* this step is best effort, removing the device would be so much trouble */
+ ignore_value(qemuDomainUpdateMemoryDeviceInfo(driver, vm,
+ QEMU_ASYNC_JOB_NONE));
+
+ ret = 0;
+
+ cleanup:
+ virObjectUnref(cfg);
+ VIR_FREE(devstr);
+ VIR_FREE(objalias);
+ virDomainMemoryDefFree(mem);
+ return ret;
+
+ removedef:
+ if (qemuDomainObjExitMonitor(driver, vm) < 0) {
+ mem = NULL;
+ goto cleanup;
+ }
+
+ if ((id = virDomainMemoryFindByDef(vm->def, mem)) >= 0)
+ mem = virDomainMemoryRemove(vm->def, id);
+ else
+ mem = NULL;
+
+ goto cleanup;
+}
+
+
static int
qemuDomainAttachHostUSBDevice(virQEMUDriverPtr driver,
virDomainObjPtr vm,
diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
index 8a0b313..ad4ff38 100644
--- a/src/qemu/qemu_hotplug.h
+++ b/src/qemu/qemu_hotplug.h
@@ -57,6 +57,9 @@ int qemuDomainAttachHostDevice(virConnectPtr conn,
virDomainHostdevDefPtr hostdev);
int qemuDomainFindGraphicsIndex(virDomainDefPtr def,
virDomainGraphicsDefPtr dev);
+int qemuDomainAttachMemory(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ virDomainMemoryDefPtr mem);
int qemuDomainChangeGraphics(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainGraphicsDefPtr dev);
--
2.2.2