qemu: Add qemu command-line to generate the nvdimm unarmed property

According to the result parsing from xml, add the unarmed property
into QEMU command line:

-device nvdimm,...[,unarmed=on]

Signed-off-by: Luyao Zhong <luyao.zhong@intel.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -3561,7 +3561,8 @@ qemuBuildMemoryDimmBackendStr(virBufferPtr buf,
 
 
 char *
-qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem)
+qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
+                         qemuDomainObjPrivatePtr priv)
 {
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     const char *device;
@@ -3589,6 +3590,16 @@ qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem)
         if (mem->labelsize)
             virBufferAsprintf(&buf, "label-size=%llu,", mem->labelsize * 1024);
 
+        if (mem->readonly) {
+            if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE_NVDIMM_UNARMED)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("nvdimm readonly property is not available "
+                                 "with this QEMU binary"));
+                return NULL;
+            }
+            virBufferAddLit(&buf, "unarmed=on,");
+        }
+
         virBufferAsprintf(&buf, "memdev=mem%s,id=%s",
                           mem->info.alias, mem->info.alias);
 
@@ -7888,7 +7899,7 @@ qemuBuildMemoryDeviceCommandLine(virCommandPtr cmd,
         virCommandAddArg(cmd, "-object");
         virCommandAddArgBuffer(cmd, &buf);
 
-        if (!(dimmStr = qemuBuildMemoryDeviceStr(def->mems[i])))
+        if (!(dimmStr = qemuBuildMemoryDeviceStr(def->mems[i], priv)))
             return -1;
 
         virCommandAddArgList(cmd, "-device", dimmStr, NULL);

src/qemu/qemu_command.h

@@ -128,7 +128,8 @@ int qemuBuildMemoryBackendProps(virJSONValuePtr *backendProps,
                                 virDomainMemoryDefPtr mem,
                                 bool force);
 
-char *qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem);
+char *qemuBuildMemoryDeviceStr(virDomainMemoryDefPtr mem,
+                               qemuDomainObjPrivatePtr priv);
 
 /* Current, best practice */
 char *qemuBuildPCIHostdevDevStr(const virDomainDef *def,

src/qemu/qemu_hotplug.c

@@ -2563,7 +2563,7 @@ qemuDomainAttachMemory(virQEMUDriverPtr driver,
     if (virAsprintf(&objalias, "mem%s", mem->info.alias) < 0)
         goto cleanup;
 
-    if (!(devstr = qemuBuildMemoryDeviceStr(mem)))
+    if (!(devstr = qemuBuildMemoryDeviceStr(mem, priv)))
         goto cleanup;
 
     if (qemuBuildMemoryBackendProps(&props, objalias, cfg,

tests/qemuxml2argvdata/memory-hotplug-nvdimm-readonly.x86_64-latest.args

@@ -0,0 +1,36 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off,nvdimm=on \
+-m size=219136k,slots=16,maxmem=1099511627776k \
+-realtime mlock=off \
+-smp 2,sockets=2,cores=1,threads=1 \
+-numa node,nodeid=0,cpus=0-1,mem=214 \
+-object memory-backend-file,id=memnvdimm0,prealloc=yes,mem-path=/tmp/nvdimm,\
+share=no,size=536870912 \
+-device nvdimm,node=0,unarmed=on,memdev=memnvdimm0,id=nvdimm0,slot=0 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvtest.c

@@ -2760,6 +2760,7 @@ mymain(void)
     DO_TEST_CAPS_LATEST("memory-hotplug-nvdimm-label");
     DO_TEST_CAPS_LATEST("memory-hotplug-nvdimm-align");
     DO_TEST_CAPS_LATEST("memory-hotplug-nvdimm-pmem");
+    DO_TEST_CAPS_LATEST("memory-hotplug-nvdimm-readonly");
 
     DO_TEST("machine-aeskeywrap-on-caps",
             QEMU_CAPS_AES_KEY_WRAP,