The 'readonly' option allows users to mark vNVDIMM read-only:
<devices>
...
<memory model='nvdimm' access='shared'>
<source>
<path>/dev/dax0.0</path>
</source>
<target>
<size unit='MiB'>4094</size>
<node>0</node>
<label>
<size unit='MiB'>2</size>
</label>
<readonly/>
</target>
</memory>
...
</devices>
Signed-off-by: Luyao Zhong <luyao.zhong@xxxxxxxxx>
---
docs/formatdomain.html.in | 45 ++++++++++++-----
docs/schemas/domaincommon.rng | 5 ++
src/conf/domain_conf.c | 12 +++++
src/conf/domain_conf.h | 1 +
.../memory-hotplug-nvdimm-readonly.xml | 58 ++++++++++++++++++++++
.../memory-hotplug-nvdimm-readonly.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
7 files changed, 111 insertions(+), 12 deletions(-)
create mode 100644 tests/qemuxml2argvdata/memory-hotplug-nvdimm-readonly.xml
create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-readonly.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 0781f24..2ca7a46 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -8331,6 +8331,7 @@ qemu-kvm -net nic,model=? /dev/null
<label>
<size unit='KiB'>128</size>
</label>
+ <readonly/>
</target>
</memory>
</devices>
@@ -8454,19 +8455,39 @@ qemu-kvm -net nic,model=? /dev/null
NUMA nodes configured.
</p>
<p>
- For NVDIMM type devices one can optionally use
- <code>label</code> and its subelement <code>size</code>
- to configure the size of namespaces label storage
- within the NVDIMM module. The <code>size</code> element
- has usual meaning described
- <a href="#elementsMemoryAllocation">here</a>.
- For QEMU domains the following restrictions apply:
+ Besides, the following optional elements can be provided as well for
+ NVDIMM type devices:
</p>
- <ol>
- <li>the minimum label size is 128KiB,</li>
- <li>the remaining size (total-size - label-size) has to be aligned to
- 4KiB</li>
- </ol>
+
+ <dl>
+ <dt><code>label</code></dt>
+ <dd>
+ <p>
+ For NVDIMM type devices one can optionally use
+ <code>label</code> and its subelement <code>size</code>
+ to configure the size of namespaces label storage
+ within the NVDIMM module. The <code>size</code> element
+ has usual meaning described
+ <a href="#elementsMemoryAllocation">here</a>.
+ For QEMU domains the following restrictions apply:
+ </p>
+ <ol>
+ <li>the minimum label size is 128KiB,</li>
+ <li>the remaining size (total-size - label-size) will be aligned to
+ 4KiB as default.</li>
+ </ol>
+ </dd>
+
+ <dt><code>readonly</code></dt>
+ <dd>
+ <p>
+ The <code>readonly</code> element can be used to mark vNVDIMM read-only.
+ Currently, only real NVDIMM device backend can guarantee the guest write
+ persistence, so please set <code>readonly</code> when using other types
+ of backends. <span class="since">Since 5.0.0</span>
+ </p>
+ </dd>
+ </dl>
</dd>
</dl>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index a7b7164..6518aff 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5422,6 +5422,11 @@
</element>
</element>
</optional>
+ <optional>
+ <element name="readonly">
+ <empty/>
+ </element>
+ </optional>
</interleave>
</element>
</define>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9edaf6d..222bb8c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15844,6 +15844,9 @@ virDomainMemoryTargetDefParseXML(xmlNodePtr node,
_("label size must be smaller than NVDIMM size"));
goto cleanup;
}
+
+ if (virXPathBoolean("boolean(./readonly)", ctxt))
+ def->readonly = true;
}
ret = 0;
@@ -22766,6 +22769,13 @@ virDomainMemoryDefCheckABIStability(virDomainMemoryDefPtr src,
"source NVDIMM pmem flag"));
return false;
}
+
+ if (src->readonly != dst->readonly) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Target NVDIMM readonly flag doesn't match "
+ "source NVDIMM readonly flag"));
+ return false;
+ }
}
return virDomainDeviceInfoCheckABIStability(&src->info, &dst->info);
@@ -26344,6 +26354,8 @@ virDomainMemoryTargetDefFormat(virBufferPtr buf,
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</label>\n");
}
+ if (def->readonly)
+ virBufferAddLit(buf, "<readonly/>\n");
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</target>\n");
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index a63afdc..fae1306 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2155,6 +2155,7 @@ struct _virDomainMemoryDef {
int targetNode;
unsigned long long size; /* kibibytes */
unsigned long long labelsize; /* kibibytes; valid only for NVDIMM */
+ bool readonly; /* valid only for NVDIMM */
virDomainDeviceInfo info;
};
diff --git a/tests/qemuxml2argvdata/memory-hotplug-nvdimm-readonly.xml b/tests/qemuxml2argvdata/memory-hotplug-nvdimm-readonly.xml
new file mode 100644
index 0000000..170992c
--- /dev/null
+++ b/tests/qemuxml2argvdata/memory-hotplug-nvdimm-readonly.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>
+ </source>
+ <target>
+ <size unit='KiB'>523264</size>
+ <node>0</node>
+ <readonly/>
+ </target>
+ <address type='dimm' slot='0'/>
+ </memory>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-readonly.xml b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-readonly.xml
new file mode 120000
index 0000000..10be844
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-readonly.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/memory-hotplug-nvdimm-readonly.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index ef3ece8..82e2c0e 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -1118,6 +1118,7 @@ mymain(void)
DO_TEST("memory-hotplug-nvdimm-label", NONE);
DO_TEST("memory-hotplug-nvdimm-align", NONE);
DO_TEST("memory-hotplug-nvdimm-pmem", NONE);
+ DO_TEST("memory-hotplug-nvdimm-readonly", NONE);
DO_TEST("net-udp", NONE);
DO_TEST("video-virtio-gpu-device", NONE);
--
2.7.4
--
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