[virt-tools-list] virt-manager qemu error when changing Disk from IDE to Virtio Bus type...

[Deepak Shetty]

Hi,
   I have a running VM under virt-manager that uses IDE hd to boot from a
.img file.
After shutting it down, i change (under VM details) the IDE disk to VirtIO
disk and it fails to start the VM and gives below error...

Error starting domain: internal error process exited while connecting to
monitor: char device redirected to /dev/pts/2
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
PCI: slot 3 function 0 not available for rtl8139, in use by virtio-blk-pci
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
Device 'rtl8139' could not be initialized

Details:

Error starting domain: internal error process exited while connecting to
monitor: char device redirected to /dev/pts/2
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
PCI: slot 3 function 0 not available for rtl8139, in use by virtio-blk-pci
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
Device 'rtl8139' could not be initialized


Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in
cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/engine.py", line 956, in
asyncfunc
    vm.startup()
  File "/usr/share/virt-manager/virtManager/domain.py", line 1048, in
startup
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 330, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error process exited while connecting to monitor:
char device redirected to /dev/pts/2
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
PCI: slot 3 function 0 not available for rtl8139, in use by virtio-blk-pci
qemu-kvm: -device
rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:1a:d4:19,bus=pci.0,addr=0x3:
Device 'rtl8139' could not be initialized


If i remove the IDE disk (using remove option from the VM details page) and
add New hardware and select VirtIO disk under storage, it works, all other
params remaning same for the storage.

I believe it should also work when i just edit/change the original IDE disk
to VirtIO, as the ability to change the Bus Type is enabled ??
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