Hi James, You should try to make a PCI pass-through for your multiport serial card in virt-manager. Although I haven't tried this kind of configuration, I think that this should be the right way to make such setup. You'll need driver for this PCI card within your guest OS. On 01/31/2012 08:01 PM, James B. Byrne wrote: > CentOS-6.2 > > We have a dedicated CentOS-5.7 host used for fax reception > and transmission that we wish to move to a CentOS-6.2 > virtual guest instance. The CentOS-6.2 virtual host has a > 4-port serial card installed. > > lspci -v tshows this this: > > 03:00.0 Serial controller: Oxford Semiconductor Ltd > OX16PCI954 (Quad 16950 UART) function 0 (Uart) (prog-if 06 > ) > Subsystem: Oxford Semiconductor Ltd Device 0000 > Flags: medium devsel, IRQ 17 > I/O ports at d040 [size=32] > Memory at d0702000 (32-bit, non-prefetchable) > [size=4K] > I/O ports at d020 [size=32] > Memory at d0701000 (32-bit, non-prefetchable) > [size=4K] > Capabilities:  Power Management version 2 > Kernel driver in use: serial > > > setserial -g /dev/ttyS* shows this: > > /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 > /dev/ttyS1, UART: 16950/954, Port: 0xd040, IRQ: 17 > /dev/ttyS2, UART: 16950/954, Port: 0xd048, IRQ: 17 > /dev/ttyS3, UART: 16950/954, Port: 0xd050, IRQ: 17 > > > But, in virt-manage, when I try to add a serial device to > the guest as the physical character device /dev/ttyS1 I > get this error and the device is not added. > > XML error: unknown device type > > Traceback (most recent call last): > File > "/usr/share/virt-manager/virtManager/addhardware.py", > line 1026, in add_device > self.vm.attach_device(self._dev) > File "/usr/share/virt-manager/virtManager/domain.py", > line 698, in attach_device > self._backend.attachDevice(devxml) > File "/usr/lib64/python2.6/site-packages/libvirt.py", > line 400, in attachDevice > if ret == -1: raise libvirtError > ('virDomainAttachDevice() failed', dom=self) > libvirtError: XML error: unknown device type > > We wish to have at least two, preferably three, andf > ideally all four, serial ports enabled on the virtual > guest. Does anyone know how this is accomplished?