The 'pmem' option allows users to specify whether the backend
storage of memory-backend-file is a real persistent memory:
<devices>
...
<memory model='nvdimm' access='shared'>
<source>
<path>/dev/dax0.0</path>
<pmem/>
</source>
<target>
<size unit='MiB'>4094</size>
<node>0</node>
<label>
<size unit='MiB'>2</size>
</label>
</target>
</memory>
...
</devices>
Signed-off-by: Luyao Zhong <luyao.zhong@xxxxxxxxx>
---
docs/formatdomain.html.in | 12 +++++
docs/schemas/domaincommon.rng | 5 ++
src/conf/domain_conf.c | 13 +++++
src/conf/domain_conf.h | 1 +
.../memory-hotplug-nvdimm-pmem.xml | 58 ++++++++++++++++++++++
.../memory-hotplug-nvdimm-pmem.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
7 files changed, 91 insertions(+)
create mode 100644 tests/qemuxml2argvdata/memory-hotplug-nvdimm-pmem.xml
create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-pmem.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 515e656..0781f24 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -8323,6 +8323,7 @@ qemu-kvm -net nic,model=? /dev/null
<source>
<path>/tmp/nvdimm</path>
<alignsize unit='KiB'>2048</alignsize>
+ <pmem/>
</source>
<target>
<size unit='KiB'>524288</size>
@@ -8423,6 +8424,17 @@ qemu-kvm -net nic,model=? /dev/null
<span class="since">Since 5.0.0</span>
</p>
</dd>
+
+ <dt><code>pmem</code></dt>
+ <dd>
+ <p>
+ This element can be used to specify whether the backend storage
+ of memory-backend-file is a real persistent memory. If the
+ backend is a real persistence memory and <code>pmem</code> is set,
+ QEMU will guarantee the persistence of its own writes to the
+ vNVDIMM backend. <span class="since">Since 5.0.0</span>
+ </p>
+ </dd>
</dl>
</dd>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 21006c3..a7b7164 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5393,6 +5393,11 @@
<ref name="scaledInteger"/>
</element>
</optional>
+ <optional>
+ <element name="pmem">
+ <empty/>
+ </element>
+ </optional>
</interleave>
</group>
</choice>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 7e59d8c..9edaf6d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15785,6 +15785,9 @@ virDomainMemorySourceDefParseXML(xmlNodePtr node,
&def->alignsize, false, false) < 0)
goto cleanup;
+ if (virXPathBoolean("boolean(./pmem)", ctxt))
+ def->nvdimmPmem = true;
+
break;
case VIR_DOMAIN_MEMORY_MODEL_NONE:
@@ -22756,6 +22759,13 @@ virDomainMemoryDefCheckABIStability(virDomainMemoryDefPtr src,
src->alignsize, dst->alignsize);
return false;
}
+
+ if (src->nvdimmPmem != dst->nvdimmPmem) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Target NVDIMM pmem flag doesn't match "
+ "source NVDIMM pmem flag"));
+ return false;
+ }
}
return virDomainDeviceInfoCheckABIStability(&src->info, &dst->info);
@@ -26296,6 +26306,9 @@ virDomainMemorySourceDefFormat(virBufferPtr buf,
if (def->alignsize)
virBufferAsprintf(buf, "<alignsize unit='KiB'>%llu</alignsize>\n",
def->alignsize);
+
+ if (def->nvdimmPmem)
+ virBufferAddLit(buf, "<pmem/>\n");
break;
case VIR_DOMAIN_MEMORY_MODEL_NONE:
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 848bd94..a63afdc 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2148,6 +2148,7 @@ struct _virDomainMemoryDef {
unsigned long long pagesize; /* kibibytes */
char *nvdimmPath;
unsigned long long alignsize; /* kibibytes; valid only for NVDIMM */
+ bool nvdimmPmem; /* valid only for NVDIMM */
/* target */
int model; /* virDomainMemoryModel */
diff --git a/tests/qemuxml2argvdata/memory-hotplug-nvdimm-pmem.xml b/tests/qemuxml2argvdata/memory-hotplug-nvdimm-pmem.xml
new file mode 100644
index 0000000..060d75c
--- /dev/null
+++ b/tests/qemuxml2argvdata/memory-hotplug-nvdimm-pmem.xml
@@ -0,0 +1,58 @@
+<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-system-i686</emulator>
+ <disk type='block' device='disk'>
+ <driver name='qemu' type='raw'/>
+ <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'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+ </controller>
+ <controller type='usb' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+ </controller>
+ <controller type='pci' index='0' model='pci-root'/>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'>
+ <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+ </memballoon>
+ <memory model='nvdimm' access='private'>
+ <source>
+ <path>/tmp/nvdimm</path>
+ <pmem/>
+ </source>
+ <target>
+ <size unit='KiB'>523264</size>
+ <node>0</node>
+ </target>
+ <address type='dimm' slot='0'/>
+ </memory>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-pmem.xml b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-pmem.xml
new file mode 120000
index 0000000..3e57c1e
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-pmem.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/memory-hotplug-nvdimm-pmem.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 5161f4a..ef3ece8 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1117,6 +1117,7 @@ mymain(void)
DO_TEST("memory-hotplug-nvdimm-access", NONE);
DO_TEST("memory-hotplug-nvdimm-label", NONE);
DO_TEST("memory-hotplug-nvdimm-align", NONE);
+ DO_TEST("memory-hotplug-nvdimm-pmem", NONE);
DO_TEST("net-udp", NONE);
DO_TEST("video-virtio-gpu-device", NONE);
--
2.7.4
--
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