qemu: Automatically add <panic> element for pSeries guests.

The guest firmware provides the same functionality as the pvpanic
device, and the relevant element should always be present in the
domain XML to reflect this fact, so add it after parsing the
definition if it wasn't there already.

docs/formatdomain.html.in

@@ -5943,6 +5943,11 @@ qemu-kvm -net nic,model=? /dev/null
       guest.
       <span class="since">Since 1.2.1, QEMU and KVM only</span>
     </p>
+    <p>
+      For pSeries guests, this feature is always enabled since it's
+      implemented by the guest firmware, thus libvirt automatically
+      adds the <code>panic</code> element to the domain XML.
+    </p>
     <p>
       Example: usage of panic configuration
     </p>

src/qemu/qemu_domain.c

@@ -959,6 +959,7 @@ qemuDomainDefPostParse(virDomainDefPtr def,
     bool addDefaultMemballoon = true;
     bool addDefaultUSBKBD = false;
     bool addDefaultUSBMouse = false;
+    bool addPanicDevice = false;
 
     if (def->os.bootloader || def->os.bootloaderArgs) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -1011,6 +1012,11 @@ qemuDomainDefPostParse(virDomainDefPtr def,
         addPCIRoot = true;
         addDefaultUSBKBD = true;
         addDefaultUSBMouse = true;
+        /* For pSeries guests, the firmware provides the same
+         * functionality as the pvpanic device, so automatically
+         * add the definition if not already present */
+        if (STRPREFIX(def->os.machine, "pseries"))
+            addPanicDevice = true;
         break;
 
     case VIR_ARCH_ALPHA:
@@ -1093,6 +1099,14 @@ qemuDomainDefPostParse(virDomainDefPtr def,
                                   VIR_DOMAIN_INPUT_BUS_USB) < 0)
         return -1;
 
+    if (addPanicDevice && !def->panic) {
+        virDomainPanicDefPtr panic;
+        if (VIR_ALLOC(panic) < 0)
+            return -1;
+
+        def->panic = panic;
+    }
+
     return 0;
 }
 

tests/qemuxml2argvdata/qemuxml2argv-pseries-disk.xml

@@ -37,5 +37,6 @@
       <model type='cirrus' vram='16384' heads='1'/>
     </video>
     <memballoon model='none'/>
+    <panic/>
   </devices>
 </domain>

tests/qemuxml2argvdata/qemuxml2argv-pseries-nvram.xml

@@ -20,5 +20,6 @@
     <nvram>
       <address type='spapr-vio' reg='0x4000'/>
     </nvram>
+    <panic/>
   </devices>
 </domain>

tests/qemuxml2argvdata/qemuxml2argv-pseries-panic-missing.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-ppc64 -S -M pseries -m 512 -smp 1 -nographic \
+-nodefconfig -nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -usb \
+-chardev pty,id=charserial0 \
+-device spapr-vty,chardev=charserial0,reg=0x30000000

tests/qemuxml2argvdata/qemuxml2argv-pseries-panic-missing.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>1ccfd97d-5eb4-478a-bbe6-88d254c16db7</uuid>
+  <memory unit='KiB'>524288</memory>
+  <currentMemory unit='KiB'>524288</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='ppc64' machine='pseries'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-ppc64</emulator>
+    <controller type='usb' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <serial type='pty'>
+      <target port='0'/>
+      <address type='spapr-vio'/>
+    </serial>
+    <console type='pty'>
+      <target type='serial' port='0'/>
+      <address type='spapr-vio'/>
+    </console>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1365,6 +1365,8 @@ mymain(void)
             QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("pseries-cpu-le",  QEMU_CAPS_KVM, QEMU_CAPS_CPU_HOST,
             QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
+    DO_TEST("pseries-panic-missing",
+            QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("pseries-panic-no-address",
             QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST_FAILURE("pseries-panic-address",

tests/qemuxml2xmloutdata/qemuxml2xmlout-pseries-panic-missing.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>1ccfd97d-5eb4-478a-bbe6-88d254c16db7</uuid>
+  <memory unit='KiB'>524288</memory>
+  <currentMemory unit='KiB'>524288</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='ppc64' machine='pseries'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-ppc64</emulator>
+    <controller type='usb' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <serial type='pty'>
+      <target port='0'/>
+      <address type='spapr-vio'/>
+    </serial>
+    <console type='pty'>
+      <target type='serial' port='0'/>
+      <address type='spapr-vio'/>
+    </console>
+    <memballoon model='none'/>
+    <panic/>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -537,6 +537,7 @@ mymain(void)
     DO_TEST("virtio-rng-egd");
 
     DO_TEST("pseries-nvram");
+    DO_TEST_DIFFERENT("pseries-panic-missing");
     DO_TEST("pseries-panic-no-address");
 
     /* These tests generate different XML */