qemu: command line generation for vfio-ccw device

Generates the QEMU command line for the vfio-ccw device.

Adds various functionality testing for vfio-ccw in libvirt:

1. Generation of QEMU command line from domain xml file
2. Generation of dump xml from domain xml file
3. Checks duplicate/invalid addresses for vfio-ccw devices.

Signed-off-by: Shalini Chellathurai Saroja <shalini@linux.vnet.ibm.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Reviewed-by: Stefan Zimmermann <stzi@linux.ibm.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

src/qemu/qemu_command.c

@@ -5103,11 +5103,17 @@ qemuBuildHostdevMediatedDevStr(const virDomainDef *def,
     virDomainHostdevSubsysMediatedDevPtr mdevsrc = &dev->source.subsys.u.mdev;
     char *ret = NULL;
     char *mdevPath = NULL;
+    const char *dev_str = NULL;
 
     if (!(mdevPath = virMediatedDeviceGetSysfsPath(mdevsrc->uuidstr)))
         goto cleanup;
 
-    virBufferAddLit(&buf, "vfio-pci");
+    dev_str = virMediatedDeviceModelTypeToString(mdevsrc->model);
+
+    if (!dev_str)
+        goto cleanup;
+
+    virBufferAdd(&buf, dev_str, -1);
     virBufferAsprintf(&buf, ",id=%s,sysfsdev=%s", dev->info->alias, mdevPath);
 
     if (qemuBuildDeviceAddressStr(&buf, def, dev->info, qemuCaps) < 0)
@@ -5327,12 +5333,29 @@ qemuBuildHostdevCommandLine(virCommandPtr cmd,
 
         /* MDEV */
         if (virHostdevIsMdevDevice(hostdev)) {
+            switch ((virMediatedDeviceModelType) subsys->u.mdev.model) {
+            case VIR_MDEV_MODEL_TYPE_VFIO_PCI:
                 if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VFIO_PCI)) {
                     virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                    _("VFIO PCI device assignment is not "
-                                 "supported by this version of qemu"));
+                                     "supported by this version of QEMU"));
                     return -1;
                 }
+                break;
+            case VIR_MDEV_MODEL_TYPE_VFIO_CCW:
+                if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VFIO_CCW)) {
+                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                                   _("VFIO CCW device assignment is not "
+                                     "supported by this version of QEMU"));
+                    return -1;
+                }
+                break;
+            case VIR_MDEV_MODEL_TYPE_LAST:
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("unexpected vfio type '%d'"), subsys->u.mdev.model);
+                return -1;
+                break;
+            }
 
             virCommandAddArg(cmd, "-device");
             if (!(devstr =

tests/qemuxml2argvdata/hostdev-subsys-mdev-vfio-ccw-duplicate-address.xml

@@ -0,0 +1,29 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>524288</memory>
+  <currentMemory unit='KiB'>524288</currentMemory>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </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-s390x</emulator>
+    <hostdev mode='subsystem' type='mdev' model='vfio-ccw'>
+      <source>
+        <address uuid='90c6c135-ad44-41d0-b1b7-bae47de48627'/>
+      </source>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </hostdev>
+    <hostdev mode='subsystem' type='mdev' model='vfio-ccw'>
+      <source>
+        <address uuid='71b411af-5491-4100-b03e-0705e0b2eb27'/>
+      </source>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </hostdev>
+  </devices>
+</domain>

tests/qemuxml2argvdata/hostdev-subsys-mdev-vfio-ccw-invalid-address.xml

@@ -0,0 +1,23 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>524288</memory>
+  <currentMemory unit='KiB'>524288</currentMemory>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </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-s390x</emulator>
+    <hostdev mode='subsystem' type='mdev' model='vfio-ccw'>
+      <source>
+        <address uuid='90c6c135-ad44-41d0-b1b7-bae47de48627'/>
+      </source>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </hostdev>
+  </devices>
+</domain>

tests/qemuxml2argvdata/hostdev-subsys-mdev-vfio-ccw.args

@@ -0,0 +1,26 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-s390x \
+-name QEMUGuest1 \
+-S \
+-machine s390-ccw-virtio,accel=tcg,usb=off,dump-guest-core=off \
+-m 512 \
+-smp 2,sockets=2,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-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 c \
+-device vfio-ccw,id=hostdev0,\
+sysfsdev=/sys/bus/mdev/devices/90c6c135-ad44-41d0-b1b7-bae47de48627,\
+devno=fe.0.0000 \
+-device virtio-balloon-ccw,id=balloon0,devno=fe.0.0001

tests/qemuxml2argvtest.c

@@ -1542,6 +1542,22 @@ mymain(void)
     DO_TEST("pci-rom-disabled", NONE);
     DO_TEST("pci-rom-disabled-invalid", NONE);
 
+    DO_TEST("hostdev-subsys-mdev-vfio-ccw",
+            QEMU_CAPS_CCW,
+            QEMU_CAPS_CCW_CSSID_UNRESTRICTED,
+            QEMU_CAPS_DEVICE_VFIO_CCW);
+    DO_TEST_FAILURE("hostdev-subsys-mdev-vfio-ccw",
+            QEMU_CAPS_CCW,
+            QEMU_CAPS_CCW_CSSID_UNRESTRICTED);
+    DO_TEST_PARSE_ERROR("hostdev-subsys-mdev-vfio-ccw-duplicate-address",
+            QEMU_CAPS_CCW,
+            QEMU_CAPS_CCW_CSSID_UNRESTRICTED,
+            QEMU_CAPS_DEVICE_VFIO_CCW);
+    DO_TEST_PARSE_ERROR("hostdev-subsys-mdev-vfio-ccw-invalid-address",
+            QEMU_CAPS_CCW,
+            QEMU_CAPS_CCW_CSSID_UNRESTRICTED,
+            QEMU_CAPS_DEVICE_VFIO_CCW);
+
     DO_TEST_FULL("restore-v2", "exec:cat", 7, 0, 0, GIC_NONE, NONE);
     DO_TEST_FULL("restore-v2-fd", "stdio", 7, 0, 0, GIC_NONE, NONE);
     DO_TEST_FULL("restore-v2-fd", "fd:7", 7, 0, 0, GIC_NONE, NONE);