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[libvirt] [PATCH] pci address conflict when virtio disk with drive type address

When using the xml as below:
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/home/soulxu/VM/images/linux.img'/>
      <target dev='hda' bus='virtio'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

Then can't statup qemu, the error message as below:
qemu-system-x86_64: -device virtio-balloon-pci,id=balloon0,bus=pci.0,multifunction=on,addr=0x3.0x0: Device 'virtio-balloon-pci' could not be initialized

Adding check for bus type and address type. Only the address of pci type support by virtio bus.

Signed-off-by: Xu He Jie <xuhj linux vnet ibm com>
 src/conf/domain_conf.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 5959593..b8aa1a2 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2644,6 +2644,14 @@ virDomainDiskDefParseXML(virCapsPtr caps,
     } else {
         if (virDomainDeviceInfoParseXML(node, &def->info, flags) < 0)
             goto error;
+        if ((def->bus ==  VIR_DOMAIN_DISK_BUS_VIRTIO) &&
+              (def->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) &&
+              (def->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE)) {
+            virDomainReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("virtio only support device address type 'PCI' "));
+            goto error;
+        }
     def->src = source;

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