qemu: Add VM Generation ID to qemu command line

https://bugzilla.redhat.com/show_bug.cgi?id=1149445

If the domain requests usage of the genid functionality,
then add the QEMU '-device vmgenid' to the command line
providing either the supplied or generated GUID value.

Add tests for both a generated and supplied GUID value.

Signed-off-by: John Ferlan <jferlan@redhat.com>
ACKed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_command.c

@@ -5969,6 +5969,34 @@ qemuBuildSmbiosCommandLine(virCommandPtr cmd,
 }
 
 
+static int
+qemuBuildVMGenIDCommandLine(virCommandPtr cmd,
+                            const virDomainDef *def,
+                            virQEMUCapsPtr qemuCaps)
+{
+    virBuffer opts = VIR_BUFFER_INITIALIZER;
+    char guid[VIR_UUID_STRING_BUFLEN];
+
+    if (!def->genidRequested)
+        return 0;
+
+    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VMGENID)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                      _("this QEMU does not support the 'genid' capability"));
+        return -1;
+    }
+
+    virUUIDFormat(def->genid, guid);
+    virBufferAsprintf(&opts, "vmgenid,guid=%s,id=vmgenid0", guid);
+
+    virCommandAddArg(cmd, "-device");
+    virCommandAddArgBuffer(cmd, &opts);
+
+    virBufferFreeAndReset(&opts);
+    return 0;
+}
+
+
 static int
 qemuBuildSgaCommandLine(virCommandPtr cmd,
                         const virDomainDef *def,
@@ -9973,6 +10001,9 @@ qemuBuildCommandLine(virQEMUDriverPtr driver,
     if (qemuBuildSmbiosCommandLine(cmd, driver, def) < 0)
         goto error;
 
+    if (qemuBuildVMGenIDCommandLine(cmd, def, qemuCaps) < 0)
+        goto error;
+
     /*
      * NB, -nographic *MUST* come before any serial, or monitor
      * or parallel port flags due to QEMU craziness, where it

tests/qemuxml2argvdata/genid-auto.x86_64-latest.args

@@ -0,0 +1,30 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc-i440fx-2.12,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-realtime mlock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-device vmgenid,guid=00010203-0405-4607-8809-0a0b0c0d0e0f,id=vmgenid0 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvdata/genid.x86_64-latest.args

@@ -0,0 +1,30 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc-i440fx-2.12,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-realtime mlock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-device vmgenid,guid=e9392370-2917-565e-692b-d057f46512d6,id=vmgenid0 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvtest.c

@@ -787,6 +787,10 @@ mymain(void)
             QEMU_CAPS_SECCOMP_BLACKLIST);
     DO_TEST_PARSE_ERROR("minimal-no-memory", NONE);
     DO_TEST("minimal-msg-timestamp", QEMU_CAPS_MSG_TIMESTAMP);
+
+    DO_TEST_CAPS_LATEST("genid");
+    DO_TEST_CAPS_LATEST("genid-auto");
+
     DO_TEST("machine-aliases1", NONE);
     DO_TEST("machine-aliases2", QEMU_CAPS_KVM);
     DO_TEST("machine-core-on", NONE);