[libvirt] [PATCH 2/3] qemu: Separate calls based on controller bus type

[Eric Farman]

For systems without a PCI bus, attaching a SCSI controller fails:

  [root at xxxxxxxx ~]# cat controller.xml
  <controller type='scsi' model='virtio-scsi' index='0' />
  [root at xxxxxxxx ~]# virsh attach-device guest01 controller.xml
  error: Failed to attach device from controller.xml
  error: XML error: No PCI buses available

A similar problem occurs with the detach of a controller:

  [root at xxxxxxxx ~]# virsh detach-device guest01 controller.xml
  error: Failed to detach device from controller.xml
  error: operation failed: controller scsi:0 not found

The qemuDomainXXtachPciControllerDevice routines made assumptions
that any caller had a PCI bus.  These routines now selectively calls
PCI functions where necessary, and assigns the device information
type to one appropriate for the bus in use.

Signed-off-by: Eric Farman <farman at linux.vnet.ibm.com>
---
 src/qemu/qemu_hotplug.c |   45 +++++++++++++++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index cb62101..779e1d9 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -365,9 +365,23 @@ int qemuDomainAttachControllerDevice(virQEMUDriverPtr driver,
         return -1;
     }
 
+    if (!controller->info.type) {
+        if (STREQLEN(vm->def->os.machine, "s390-ccw", 8) &&
+            virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_VIRTIO_CCW))
+            controller->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW;
+        else if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_VIRTIO_S390))
+            controller->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_S390;
+    }
+
     if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
-        if (qemuDomainPCIAddressEnsureAddr(priv->pciaddrs, &controller->info) < 0)
-            goto cleanup;
+        if (!controller->info.type ||
+             controller->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
+            if (qemuDomainPCIAddressEnsureAddr(priv->pciaddrs, &controller->info) < 0)
+                goto cleanup;
+        } else if (controller->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
+            if (qemuDomainCCWAddressAssign(&controller->info, priv->ccwaddrs, true) < 0)
+                goto cleanup;
+        }
         releaseaddr = true;
         if (qemuAssignDeviceControllerAlias(controller) < 0)
             goto cleanup;
@@ -399,7 +413,8 @@ int qemuDomainAttachControllerDevice(virQEMUDriverPtr driver,
     qemuDomainObjExitMonitor(driver, vm);
 
     if (ret == 0) {
-        controller->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
+        if (!controller->info.type)
+            controller->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
         virDomainControllerInsertPreAlloced(vm->def, controller);
     }
 
@@ -3009,18 +3024,20 @@ int qemuDomainDetachControllerDevice(virQEMUDriverPtr driver,
 
     detach = vm->def->controllers[idx];
 
-    if (!virDomainDeviceAddressIsValid(&detach->info,
-                                       VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)) {
-        virReportError(VIR_ERR_OPERATION_FAILED, "%s",
-                       _("device cannot be detached without a PCI address"));
-        goto cleanup;
-    }
+    if (detach->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) {
+        if (!virDomainDeviceAddressIsValid(&detach->info,
+                                           VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)) {
+            virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+                           _("device cannot be detached without a PCI address"));
+            goto cleanup;
+        }
 
-    if (qemuIsMultiFunctionDevice(vm->def, &detach->info)) {
-        virReportError(VIR_ERR_OPERATION_FAILED,
-                       _("cannot hot unplug multifunction PCI device: %s"),
-                       dev->data.disk->dst);
-        goto cleanup;
+        if (qemuIsMultiFunctionDevice(vm->def, &detach->info)) {
+            virReportError(VIR_ERR_OPERATION_FAILED,
+                           _("cannot hot unplug multifunction PCI device: %s"),
+                           dev->data.disk->dst);
+            goto cleanup;
+        }
     }
 
     if (qemuDomainControllerIsBusy(vm, detach)) {
-- 
1.7.9.5