The 'unarmed' 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>
<unarmed/>
</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-pmem.xml | 1 +
.../memory-hotplug-nvdimm-unarmed.xml | 1 +
tests/qemuxml2xmltest.c | 1 +
7 files changed, 54 insertions(+), 12 deletions(-)
create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-pmem.xml
create mode 120000 tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-unarmed.xml
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 0f50da6..a8cf220 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>
+ <unarmed/>
</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>unarmed</code></dt>
+ <dd>
+ <p>
+ The <code>unarmed</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>unarmed</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 734589e..de098a5 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -5422,6 +5422,11 @@
</element>
</element>
</optional>
+ <optional>
+ <element name="unarmed">
+ <empty/>
+ </element>
+ </optional>
</interleave>
</element>
</define>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9edaf6d..ef7156d 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(./unarmed)", ctxt))
+ def->nvdimmUnarmed = true;
}
ret = 0;
@@ -22766,6 +22769,13 @@ virDomainMemoryDefCheckABIStability(virDomainMemoryDefPtr src,
"source NVDIMM pmem flag"));
return false;
}
+
+ if (src->nvdimmUnarmed != dst->nvdimmUnarmed) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("Target NVDIMM unarmed flag doesn't match "
+ "source NVDIMM unarmed 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->nvdimmUnarmed)
+ virBufferAddLit(buf, "<unarmed/>\n");
virBufferAdjustIndent(buf, -2);
virBufferAddLit(buf, "</target>\n");
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index a63afdc..8538d89 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 nvdimmUnarmed; /* valid only for NVDIMM */
virDomainDeviceInfo info;
};
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/qemuxml2xmloutdata/memory-hotplug-nvdimm-unarmed.xml b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-unarmed.xml
new file mode 120000
index 0000000..1793347
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/memory-hotplug-nvdimm-unarmed.xml
@@ -0,0 +1 @@
+../qemuxml2argvdata/memory-hotplug-nvdimm-unarmed.xml
\ No newline at end of file
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index ef3ece8..493ce1d 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-unarmed", NONE);
DO_TEST("net-udp", NONE);
DO_TEST("video-virtio-gpu-device", NONE);
--
2.7.4
--
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