[libvirt] [PATCHv3 03/12] conf: Add support for parsing and formatting max memory and slot count
Peter Krempa
pkrempa at redhat.com
Tue Mar 17 14:19:52 UTC 2015
Add a XML element that will allow to specify maximum supportable memory
and the count of memory slots to use with memory hotplug.
To avoid possible confusion and misuse of the new element this patch
also explicitly forbids the use of the maxMemory setting in individual
drivers's post parse callbacks. This limitation will be lifted when the
support is implemented.
---
Notes:
Version 3:
- tweaked docs according to suggestions
Version 2:
- changed version in docs to 1.2.14
- fixed typo in code and in commit message
- simplified condition when formatting the <maxMemory> element
- rebased on top of the changes to the refactor series
Version 2:
- changed version in docs to 1.2.14
- fixed typo in code and in commit message
- simplified condition when formatting the <maxMemory> element
- rebased on top of the changes to the refactor series
docs/formatdomain.html.in | 20 +++++++++++
docs/schemas/domaincommon.rng | 8 +++++
src/bhyve/bhyve_domain.c | 4 +++
src/conf/domain_conf.c | 66 ++++++++++++++++++++++++++++++++++++
src/conf/domain_conf.h | 7 ++++
src/libvirt_private.syms | 1 +
src/libxl/libxl_domain.c | 5 +++
src/lxc/lxc_domain.c | 4 +++
src/openvz/openvz_driver.c | 11 ++++--
src/parallels/parallels_driver.c | 6 +++-
src/phyp/phyp_driver.c | 6 +++-
src/qemu/qemu_domain.c | 4 +++
src/uml/uml_driver.c | 6 +++-
src/vbox/vbox_common.c | 6 +++-
src/vmware/vmware_driver.c | 6 +++-
src/vmx/vmx.c | 6 +++-
src/xen/xen_driver.c | 4 +++
src/xenapi/xenapi_driver.c | 6 +++-
tests/domainschemadata/maxMemory.xml | 19 +++++++++++
19 files changed, 186 insertions(+), 9 deletions(-)
create mode 100644 tests/domainschemadata/maxMemory.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 8d98915..57caef0 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -675,6 +675,7 @@
<pre>
<domain>
...
+ <maxMemory slots='16' unit='KiB'>1524288</maxMemory>
<memory unit='KiB'>524288</memory>
<currentMemory unit='KiB'>524288</currentMemory>
...
@@ -708,6 +709,25 @@
<span class='since'><code>unit</code> since 0.9.11</span>,
<span class='since'><code>dumpCore</code> since 0.10.2
(QEMU only)</span></dd>
+ <dt><code>maxMemory</code></dt>
+ <dd>The run time maximum memory allocation of the guest. The initial
+ memory specified by either the <code><memory></code> element or
+ the NUMA cell size configuration can be increased by hot-plugging of
+ memory to the limit specified by this element.
+
+ The <code>unit</code> attribute behaves the same as for
+ <code><memory></code>.
+
+ The <code>slots</code> attribute specifies the number of slots
+ available for adding memory to the guest. The bounds are hypervisor
+ specific.
+
+ Note that due to alignment of the memory chunks added via memory
+ hotplug the full size allocation specified by this element may be
+ impossible to achieve.
+ <span class='since'>Since 1.2.14</span>
+ </dd>
+
<dt><code>currentMemory</code></dt>
<dd>The actual allocation of memory for the guest. This value can
be less than the maximum allocation, to allow for ballooning
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index ebd9299..a0dee17 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -593,6 +593,14 @@
</element>
</optional>
<optional>
+ <element name="maxMemory">
+ <ref name="scaledInteger"/>
+ <attribute name="slots">
+ <ref name="unsignedInt"/>
+ </attribute>
+ </element>
+ </optional>
+ <optional>
<element name="currentMemory">
<ref name='scaledInteger'/>
</element>
diff --git a/src/bhyve/bhyve_domain.c b/src/bhyve/bhyve_domain.c
index ecb1758..25ef852 100644
--- a/src/bhyve/bhyve_domain.c
+++ b/src/bhyve/bhyve_domain.c
@@ -67,6 +67,10 @@ bhyveDomainDefPostParse(virDomainDefPtr def,
VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT) < 0)
return -1;
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index c75b543..dc15d95 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -980,6 +980,27 @@ virDomainBlkioDeviceParseXML(xmlNodePtr root,
}
+/**
+ * virDomainDefCheckUnsupportedMemoryHotplug:
+ * @def: domain definition
+ *
+ * Returns -1 if the domain definition would enable memory hotplug via the
+ * <maxMemory> tunable and reports an error. Otherwise returns 0.
+ */
+int
+virDomainDefCheckUnsupportedMemoryHotplug(virDomainDefPtr def)
+{
+ /* memory hotplug tunables are not supported by this driver */
+ if (def->mem.max_memory > 0 || def->mem.memory_slots > 0) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("memory hotplug tunables <maxMemory> are not "
+ "supported by this hypervisor driver"));
+ return -1;
+ }
+
+ return 0;
+}
+
static void
virDomainObjListDataFree(void *payload, const void *name ATTRIBUTE_UNUSED)
@@ -3237,6 +3258,22 @@ virDomainDefPostParseInternal(virDomainDefPtr def,
def->mem.cur_balloon = virDomainDefGetMemoryActual(def);
}
+ if ((def->mem.max_memory || def->mem.memory_slots) &&
+ !(def->mem.max_memory && def->mem.memory_slots)) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("both maximum memory size and "
+ "memory slot count must be specified"));
+ return -1;
+ }
+
+ if (def->mem.max_memory &&
+ def->mem.max_memory < virDomainDefGetMemoryActual(def)) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("maximum memory size must be equal or greater than "
+ "the actual memory size"));
+ return -1;
+ }
+
/*
* Some really crazy backcompat stuff for consoles
*
@@ -13263,6 +13300,16 @@ virDomainDefParseXML(xmlDocPtr xml,
&def->mem.cur_balloon, false, true) < 0)
goto error;
+ if (virDomainParseMemory("./maxMemory[1]", NULL, ctxt,
+ &def->mem.max_memory, false, false) < 0)
+ goto error;
+
+ if (virXPathUInt("string(./maxMemory[1]/@slots)", ctxt, &def->mem.memory_slots) == -2) {
+ virReportError(VIR_ERR_XML_ERROR, "%s",
+ _("Failed to parse memory slot count"));
+ goto error;
+ }
+
/* and info about it */
if ((tmp = virXPathString("string(./memory[1]/@dumpCore)", ctxt)) &&
(def->mem.dump_core = virTristateSwitchTypeFromString(tmp)) <= 0) {
@@ -16189,6 +16236,19 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
if (!virDomainNumaCheckABIStability(src->numa, dst->numa))
goto error;
+ if (src->mem.memory_slots != dst->mem.memory_slots) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Target domain memory slots count '%u' doesn't match source '%u"),
+ dst->mem.memory_slots, src->mem.memory_slots);
+ goto error;
+ }
+ if (src->mem.max_memory != dst->mem.max_memory) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Target maximum memory size '%llu' doesn't match source '%llu'"),
+ dst->mem.max_memory, src->mem.max_memory);
+ goto error;
+ }
+
if (src->vcpus != dst->vcpus) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target domain vCPU count %d does not match source %d"),
@@ -19878,6 +19938,12 @@ virDomainDefFormatInternal(virDomainDefPtr def,
xmlIndentTreeOutput = oldIndentTreeOutput;
}
+ if (def->mem.max_memory) {
+ virBufferAsprintf(buf,
+ "<maxMemory slots='%u' unit='KiB'>%llu</maxMemory>\n",
+ def->mem.memory_slots, def->mem.max_memory);
+ }
+
virBufferAddLit(buf, "<memory");
if (def->mem.dump_core)
virBufferAsprintf(buf, " dumpCore='%s'",
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 4eb7742..469fc0c 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2042,6 +2042,10 @@ struct _virDomainMemtune {
virDomainHugePagePtr hugepages;
size_t nhugepages;
+ /* maximum supported memory for a guest, for hotplugging */
+ unsigned long long max_memory; /* in kibibytes */
+ unsigned int memory_slots; /* maximum count of RAM memory slots */
+
bool nosharepages;
bool locked;
int dump_core; /* enum virTristateSwitch */
@@ -2337,6 +2341,9 @@ virDomainObjPtr virDomainObjListFindByName(virDomainObjListPtr doms,
bool virDomainObjTaint(virDomainObjPtr obj,
virDomainTaintFlags taint);
+
+int virDomainDefCheckUnsupportedMemoryHotplug(virDomainDefPtr def);
+
void virDomainPanicDefFree(virDomainPanicDefPtr panic);
void virDomainResourceDefFree(virDomainResourceDefPtr resource);
void virDomainGraphicsDefFree(virDomainGraphicsDefPtr def);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 1fb42ac..0988bc3 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -187,6 +187,7 @@ virDomainCpuPlacementModeTypeFromString;
virDomainCpuPlacementModeTypeToString;
virDomainDefAddImplicitControllers;
virDomainDefCheckABIStability;
+virDomainDefCheckUnsupportedMemoryHotplug;
virDomainDefClearCCWAddresses;
virDomainDefClearDeviceAliases;
virDomainDefClearPCIAddresses;
diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 611ccf4..3843ae0 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -567,6 +567,11 @@ libxlDomainDefPostParse(virDomainDefPtr def,
def->nconsoles = 1;
def->consoles[0] = chrdef;
}
+
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/lxc/lxc_domain.c b/src/lxc/lxc_domain.c
index 55f5b49..1367b0c 100644
--- a/src/lxc/lxc_domain.c
+++ b/src/lxc/lxc_domain.c
@@ -94,6 +94,10 @@ virLXCDomainDefPostParse(virDomainDefPtr def,
!(def->emulator = virDomainDefGetDefaultEmulator(def, caps)))
return -1;
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/openvz/openvz_driver.c b/src/openvz/openvz_driver.c
index 71b0471..055670a 100644
--- a/src/openvz/openvz_driver.c
+++ b/src/openvz/openvz_driver.c
@@ -96,8 +96,15 @@ openvzDomainDefPostParse(virDomainDefPtr def,
void *opaque ATTRIBUTE_UNUSED)
{
/* fill the init path */
- if (STREQ(def->os.type, "exe") && !def->os.init)
- return VIR_STRDUP(def->os.init, "/sbin/init") < 0 ? -1 : 0;
+ if (STREQ(def->os.type, "exe") && !def->os.init) {
+ if (VIR_STRDUP(def->os.init, "/sbin/init") < 0)
+ return -1;
+ }
+
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/parallels/parallels_driver.c b/src/parallels/parallels_driver.c
index bf29a96..62f17aa 100644
--- a/src/parallels/parallels_driver.c
+++ b/src/parallels/parallels_driver.c
@@ -161,10 +161,14 @@ parallelsConnectGetCapabilities(virConnectPtr conn)
}
static int
-parallelsDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+parallelsDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/phyp/phyp_driver.c b/src/phyp/phyp_driver.c
index 60a47ad..f4db2e0 100644
--- a/src/phyp/phyp_driver.c
+++ b/src/phyp/phyp_driver.c
@@ -1094,10 +1094,14 @@ openSSHSession(virConnectPtr conn, virConnectAuthPtr auth,
static int
-phypDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+phypDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 2eacef2..6484bb5 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -1052,6 +1052,10 @@ qemuDomainDefPostParse(virDomainDefPtr def,
VIR_DOMAIN_INPUT_BUS_USB) < 0)
return -1;
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 27731f2..bdfc12e 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -444,10 +444,14 @@ umlDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
static int
-umlDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+umlDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/vbox/vbox_common.c b/src/vbox/vbox_common.c
index 0fb53aa..cad77f7 100644
--- a/src/vbox/vbox_common.c
+++ b/src/vbox/vbox_common.c
@@ -249,10 +249,14 @@ static char *vboxGenerateMediumName(PRUint32 storageBus,
}
static int
-vboxDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vboxDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/vmware/vmware_driver.c b/src/vmware/vmware_driver.c
index 36f992b..3382994 100644
--- a/src/vmware/vmware_driver.c
+++ b/src/vmware/vmware_driver.c
@@ -83,10 +83,14 @@ vmwareDataFreeFunc(void *data)
}
static int
-vmwareDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vmwareDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/vmx/vmx.c b/src/vmx/vmx.c
index 8cbf4d8..8b81436 100644
--- a/src/vmx/vmx.c
+++ b/src/vmx/vmx.c
@@ -524,10 +524,14 @@ VIR_ENUM_IMPL(virVMXControllerModelSCSI, VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST,
* Helpers
*/
static int
-vmxDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+vmxDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/xen/xen_driver.c b/src/xen/xen_driver.c
index 7577881..b104243 100644
--- a/src/xen/xen_driver.c
+++ b/src/xen/xen_driver.c
@@ -388,6 +388,10 @@ xenDomainDefPostParse(virDomainDefPtr def,
def->memballoon = memballoon;
}
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/xenapi/xenapi_driver.c b/src/xenapi/xenapi_driver.c
index affc153..3134441 100644
--- a/src/xenapi/xenapi_driver.c
+++ b/src/xenapi/xenapi_driver.c
@@ -70,10 +70,14 @@ xenapiDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
static int
-xenapiDomainDefPostParse(virDomainDefPtr def ATTRIBUTE_UNUSED,
+xenapiDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque ATTRIBUTE_UNUSED)
{
+ /* memory hotplug tunables are not supported by this driver */
+ if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
+ return -1;
+
return 0;
}
diff --git a/tests/domainschemadata/maxMemory.xml b/tests/domainschemadata/maxMemory.xml
new file mode 100644
index 0000000..df2e3d8
--- /dev/null
+++ b/tests/domainschemadata/maxMemory.xml
@@ -0,0 +1,19 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <maxMemory slots='9' unit='KiB'>1233456789</maxMemory>
+ <memory unit='KiB'>219136</memory>
+ <currentMemory unit='KiB'>219136</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ </devices>
+</domain>
--
2.2.2
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