qemu: Add zPCI address definition check

We should ensure that QEMU supports zPCI when a zPCI address is defined
in XML and otherwise report an error. This patch introduces a generic
validation function qemuDomainDeviceDefValidateAddress() which calls
qemuDomainDeviceDefValidateZPCIAddress() if address type is PCI address.

Signed-off-by: Yi Min Zhao <zyimin@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>

src/qemu/qemu_domain.c

@@ -5849,6 +5849,38 @@ qemuDomainDeviceDefValidateInput(const virDomainInputDef *input,
 }
 
 
+static int
+qemuDomainDeviceDefValidateZPCIAddress(virDomainDeviceInfoPtr info,
+                                       virQEMUCapsPtr qemuCaps)
+{
+    if (!virZPCIDeviceAddressIsEmpty(&info->addr.pci.zpci) &&
+        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_ZPCI)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       "%s",
+                       _("This QEMU binary doesn't support zPCI"));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+static int
+qemuDomainDeviceDefValidateAddress(const virDomainDeviceDef *dev,
+                                   virQEMUCapsPtr qemuCaps)
+{
+    virDomainDeviceInfoPtr info;
+
+    if (!(info = virDomainDeviceGetInfo((virDomainDeviceDef *)dev)))
+        return 0;
+
+    if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)
+        return qemuDomainDeviceDefValidateZPCIAddress(info, qemuCaps);
+
+    return 0;
+}
+
+
 static int
 qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
                             const virDomainDef *def,
@@ -5862,6 +5894,9 @@ qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
                                             def->emulator)))
         return -1;
 
+    if ((ret = qemuDomainDeviceDefValidateAddress(dev, qemuCaps)) < 0)
+        goto cleanup;
+
     switch ((virDomainDeviceType)dev->type) {
     case VIR_DOMAIN_DEVICE_NET:
         ret = qemuDomainDeviceDefValidateNetwork(dev->data.net);
@@ -5937,6 +5972,7 @@ qemuDomainDeviceDefValidate(const virDomainDeviceDef *dev,
         break;
     }
 
+ cleanup:
     virObjectUnref(qemuCaps);
     return ret;
 }

tests/qemuxml2argvdata/hostdev-vfio-zpci-wrong-arch.xml

@@ -0,0 +1,34 @@
+<domain type='qemu'>
+  <name>QEMUGuest2</name>
+  <uuid>c7a5fdbd-edaf-9466-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>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-i686</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest2'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='pci' index='0' model='pci-root'/>
+    <hostdev mode='subsystem' type='pci' managed='yes'>
+      <driver name='vfio'/>
+      <source>
+        <address domain='0x0001' bus='00' slot='00' function='0'/>
+      </source>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'>
+        <zpci uid='0x0019' fid='0x0000001f'/>
+      </address>
+    </hostdev>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1683,6 +1683,8 @@ mymain(void)
     DO_TEST_PARSE_ERROR("hostdev-mdev-display-missing-graphics",
             QEMU_CAPS_DEVICE_VFIO_PCI,
             QEMU_CAPS_VFIO_PCI_DISPLAY);
+    DO_TEST_PARSE_ERROR("hostdev-vfio-zpci-wrong-arch",
+                        QEMU_CAPS_DEVICE_VFIO_PCI);
     DO_TEST("hostdev-vfio-zpci",
             QEMU_CAPS_DEVICE_VFIO_PCI,
             QEMU_CAPS_DEVICE_ZPCI);