When using the xml as below: ------------------------------------------------------ <devices> <emulator>/home/soulxu/data/work-code/qemu-kvm/x86_64-softmmu/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/home/soulxu/data/VM/images/linux.img'/> <target dev='vda' bus='virtio'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='-1' autoport='yes'/> <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </memballoon> </devices> ------------------------------------------------------ Then can't startup qemu, the error message as below: virsh # start test-vm error: Failed to start domain test-vm error: internal error process exited while connecting to monitor: qemu-system-x86_64: -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3: PCI: slot 3 function 0 not available for virtio-balloon-pci, in use by virtio-blk-pci qemu-system-x86_64: -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3: Device 'virtio-balloon-pci' could not be initialized So 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(a)linux.vnet.ibm.com&gt; --- src/qemu/qemu_command.c | 14 ++++++++++---- 1 files changed, 10 insertions(+), 4 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 0c5bfab..07eaece 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -1319,15 +1319,21 @@ qemuAssignDevicePCISlots(virDomainDefPtr def, qemuDomainPCIAddressSetPtr addrs) goto error; } - /* Disks (VirtIO only for now */ + /* Disks (VirtIO only for now) */ for (i = 0; i < def->ndisks ; i++) { - if (def->disks[i]->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) - continue; - /* Only VirtIO disks use PCI addrs */ if (def->disks[i]->bus != VIR_DOMAIN_DISK_BUS_VIRTIO) continue; + if (def->disks[i]->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI) + continue; + + if (def->disks[i]->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) { + qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("virtio only support device address type 'PCI'")); + goto error; + } + if (qemuDomainPCIAddressSetNextAddr(addrs, &def->disks[i]->info) < 0) goto error; } -- 1.7.5.4