[libvirt] [PATCH 1/5] Introduce NVDIMM memory model
Michal Privoznik
mprivozn at redhat.com
Mon Aug 1 15:10:05 UTC 2016
NVDIMM is new type of memory introduced in qemu. The idea is that
we have a DIMM module that keeps the data persistent across
domain reboots.
At the domain XML level, we already have some representation of
'dimm' modules. Long story short, we have <memory/> element that
lives under <devices/>. Now, the element even has @model
attribute which we can use to introduce new memory type:
<memory model='nvdimm'>
<source>
<path>/tmp/nvdimm</path>
</source>
<target>
<size unit='KiB'>523264</size>
<node>0</node>
</target>
</memory>
So far, this is just a XML parser/formatter extension. QEMU
driver implementation is in the next commit.
For more info on NVDIMM visit the following web page:
http://pmem.io/
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
docs/formatdomain.html.in | 26 ++++--
docs/schemas/domaincommon.rng | 32 ++++---
src/conf/domain_conf.c | 97 ++++++++++++++++------
src/conf/domain_conf.h | 2 +
src/qemu/qemu_command.c | 6 ++
src/qemu/qemu_domain.c | 1 +
.../qemuxml2argv-memory-hotplug-nvdimm.xml | 49 +++++++++++
7 files changed, 171 insertions(+), 42 deletions(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-nvdimm.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 8efd6af..981b820 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -6702,6 +6702,15 @@ qemu-kvm -net nic,model=? /dev/null
<node>1</node>
</target>
</memory>
+ <memory model='nvdimm'>
+ <source>
+ <path>/tmp/nvdimm</path>
+ </source>
+ <target>
+ <size unit='KiB'>524287</size>
+ <node>1</node>
+ </target>
+ </memory>
</devices>
...
</pre>
@@ -6709,17 +6718,19 @@ qemu-kvm -net nic,model=? /dev/null
<dt><code>model</code></dt>
<dd>
<p>
- Currently only the <code>dimm</code> model is supported in order to
- add a virtual DIMM module to the guest.
+ Select <code>dimm</code> to add a virtual DIMM module to the guest.
+ Alternatively, <code>nvdimm</code> model adds a Non-Volatile DIMM
+ module. <span class="since">Since 2.2.0</span>
</p>
</dd>
<dt><code>source</code></dt>
<dd>
<p>
- The optional source element allows to fine tune the source of the
- memory used for the given memory device. If the element is not
- provided defaults configured via <code>numatune</code> are used.
+ For model <code>dimm</code> this element is optional and allows to
+ fine tune the source of the memory used for the given memory device.
+ If the element is not provided defaults configured via
+ <code>numatune</code> are used.
</p>
<p>
<code>pagesize</code> can optionally be used to override the default
@@ -6732,6 +6743,11 @@ qemu-kvm -net nic,model=? /dev/null
<code>nodemask</code> can optionally be used to override the default
set of NUMA nodes where the memory would be allocated.
</p>
+ <p>
+ For model <code>nvdimm</code> this element is mandatory and has a
+ single child element <code>path</code> which value represents a path
+ in host that back the nvdimm module in the guest.
+ </p>
</dd>
<dt><code>target</code></dt>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index ac9fd21..3265c2b 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4693,6 +4693,7 @@
<attribute name="model">
<choice>
<value>dimm</value>
+ <value>nvdimm</value>
</choice>
</attribute>
<interleave>
@@ -4712,18 +4713,27 @@
<define name="memorydev-source">
<element name="source">
- <interleave>
- <optional>
- <element name="pagesize">
- <ref name="scaledInteger"/>
+ <choice>
+ <group>
+ <interleave>
+ <optional>
+ <element name="pagesize">
+ <ref name="scaledInteger"/>
+ </element>
+ </optional>
+ <optional>
+ <element name="nodemask">
+ <ref name="cpuset"/>
+ </element>
+ </optional>
+ </interleave>
+ </group>
+ <group>
+ <element name="path">
+ <text/>
</element>
- </optional>
- <optional>
- <element name="nodemask">
- <ref name="cpuset"/>
- </element>
- </optional>
- </interleave>
+ </group>
+ </choice>
</element>
</define>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a56e0f5..60f1f21 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -837,8 +837,11 @@ VIR_ENUM_DECL(virDomainBlockJob)
VIR_ENUM_IMPL(virDomainBlockJob, VIR_DOMAIN_BLOCK_JOB_TYPE_LAST,
"", "", "copy", "", "active-commit")
-VIR_ENUM_IMPL(virDomainMemoryModel, VIR_DOMAIN_MEMORY_MODEL_LAST,
- "", "dimm")
+VIR_ENUM_IMPL(virDomainMemoryModel,
+ VIR_DOMAIN_MEMORY_MODEL_LAST,
+ "",
+ "dimm",
+ "nvdimm")
static virClassPtr virDomainObjClass;
static virClassPtr virDomainXMLOptionClass;
@@ -2342,6 +2345,7 @@ void virDomainMemoryDefFree(virDomainMemoryDefPtr def)
if (!def)
return;
+ VIR_FREE(def->path);
virBitmapFree(def->sourceNodes);
virDomainDeviceInfoClear(&def->info);
VIR_FREE(def);
@@ -13137,20 +13141,36 @@ virDomainMemorySourceDefParseXML(xmlNodePtr node,
xmlNodePtr save = ctxt->node;
ctxt->node = node;
- if (virDomainParseMemory("./pagesize", "./pagesize/@unit", ctxt,
- &def->pagesize, false, false) < 0)
- goto cleanup;
-
- if ((nodemask = virXPathString("string(./nodemask)", ctxt))) {
- if (virBitmapParse(nodemask, &def->sourceNodes,
- VIR_DOMAIN_CPUMASK_LEN) < 0)
+ switch ((virDomainMemoryModel) def->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ if (virDomainParseMemory("./pagesize", "./pagesize/@unit", ctxt,
+ &def->pagesize, false, false) < 0)
goto cleanup;
- if (virBitmapIsAllClear(def->sourceNodes)) {
- virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
- _("Invalid value of 'nodemask': %s"), nodemask);
+ if ((nodemask = virXPathString("string(./nodemask)", ctxt))) {
+ if (virBitmapParse(nodemask, &def->sourceNodes,
+ VIR_DOMAIN_CPUMASK_LEN) < 0)
+ goto cleanup;
+
+ if (virBitmapIsAllClear(def->sourceNodes)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("Invalid value of 'nodemask': %s"), nodemask);
+ goto cleanup;
+ }
+ }
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ if (!(def->path = virXPathString("string(./path)", ctxt))) {
+ virReportError(VIR_ERR_XML_DETAIL, "%s",
+ _("path is required for model nvdimm'"));
goto cleanup;
}
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ break;
}
ret = 0;
@@ -14538,12 +14558,25 @@ virDomainMemoryFindByDefInternal(virDomainDefPtr def,
tmp->size != mem->size)
continue;
- /* source stuff -> match with device */
- if (tmp->pagesize != mem->pagesize)
- continue;
+ switch ((virDomainMemoryModel) mem->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ /* source stuff -> match with device */
+ if (tmp->pagesize != mem->pagesize)
+ continue;
- if (!virBitmapEqual(tmp->sourceNodes, mem->sourceNodes))
- continue;
+ if (!virBitmapEqual(tmp->sourceNodes, mem->sourceNodes))
+ continue;
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ if (STRNEQ(tmp->path, mem->path))
+ continue;
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ break;
+ }
break;
}
@@ -21659,23 +21692,35 @@ virDomainMemorySourceDefFormat(virBufferPtr buf,
char *bitmap = NULL;
int ret = -1;
- if (!def->pagesize && !def->sourceNodes)
+ if (!def->pagesize && !def->sourceNodes && !def->path)
return 0;
virBufferAddLit(buf, "<source>\n");
virBufferAdjustIndent(buf, 2);
- if (def->sourceNodes) {
- if (!(bitmap = virBitmapFormat(def->sourceNodes)))
- goto cleanup;
+ switch ((virDomainMemoryModel) def->model) {
+ case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ if (def->sourceNodes) {
+ if (!(bitmap = virBitmapFormat(def->sourceNodes)))
+ goto cleanup;
- virBufferAsprintf(buf, "<nodemask>%s</nodemask>\n", bitmap);
+ virBufferAsprintf(buf, "<nodemask>%s</nodemask>\n", bitmap);
+ }
+
+ if (def->pagesize)
+ virBufferAsprintf(buf, "<pagesize unit='KiB'>%llu</pagesize>\n",
+ def->pagesize);
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ virBufferAsprintf(buf, "<path>%s</path>\n", def->path);
+ break;
+
+ case VIR_DOMAIN_MEMORY_MODEL_NONE:
+ case VIR_DOMAIN_MEMORY_MODEL_LAST:
+ break;
}
- if (def->pagesize)
- virBufferAsprintf(buf, "<pagesize unit='KiB'>%llu</pagesize>\n",
- def->pagesize);
-
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</source>\n");
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 3c2f182..1201feb 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1935,6 +1935,7 @@ struct _virDomainRNGDef {
typedef enum {
VIR_DOMAIN_MEMORY_MODEL_NONE,
VIR_DOMAIN_MEMORY_MODEL_DIMM, /* dimm hotpluggable memory device */
+ VIR_DOMAIN_MEMORY_MODEL_NVDIMM, /* nvdimm memory device */
VIR_DOMAIN_MEMORY_MODEL_LAST
} virDomainMemoryModel;
@@ -1943,6 +1944,7 @@ struct _virDomainMemoryDef {
/* source */
virBitmapPtr sourceNodes;
unsigned long long pagesize; /* kibibytes */
+ char *path;
/* target */
int model; /* virDomainMemoryModel */
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 5325f48..f5a68cc 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3395,6 +3395,12 @@ qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem)
break;
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
+ virReportError(VIR_ERR_NO_SUPPORT, "%s",
+ _("nvdimm not supported yet"));
+ return NULL;
+ break;
+
case VIR_DOMAIN_MEMORY_MODEL_NONE:
case VIR_DOMAIN_MEMORY_MODEL_LAST:
break;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 0a3cf0e..8948ac1 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -5158,6 +5158,7 @@ qemuDomainDefValidateMemoryHotplugDevice(const virDomainMemoryDef *mem,
{
switch ((virDomainMemoryModel) mem->model) {
case VIR_DOMAIN_MEMORY_MODEL_DIMM:
+ case VIR_DOMAIN_MEMORY_MODEL_NVDIMM:
if (mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DIMM &&
mem->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-nvdimm.xml b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-nvdimm.xml
new file mode 100644
index 0000000..e932241
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-memory-hotplug-nvdimm.xml
@@ -0,0 +1,49 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <maxMemory slots='16' unit='KiB'>1099511627776</maxMemory>
+ <memory unit='KiB'>1267710</memory>
+ <currentMemory unit='KiB'>1267710</currentMemory>
+ <vcpu placement='static' cpuset='0-1'>2</vcpu>
+ <os>
+ <type arch='i686' machine='pc'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <idmap>
+ <uid start='0' target='1000' count='10'/>
+ <gid start='0' target='1000' count='10'/>
+ </idmap>
+ <cpu>
+ <topology sockets='2' cores='1' threads='1'/>
+ <numa>
+ <cell id='0' cpus='0-1' memory='219136' unit='KiB'/>
+ </numa>
+ </cpu>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ <disk type='block' device='disk'>
+ <source dev='/dev/HostVG/QEMUGuest1'/>
+ <target dev='hda' bus='ide'/>
+ <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+ </disk>
+ <controller type='ide' index='0'/>
+ <controller type='usb' index='0'/>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'/>
+ <memory model='nvdimm'>
+ <source>
+ <path>/tmp/nvdimm</path>
+ </source>
+ <target>
+ <size unit='KiB'>523264</size>
+ <node>0</node>
+ </target>
+ </memory>
+ </devices>
+</domain>
--
2.8.4
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