Re: [Xen-users] serial port in domain > 0

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

I don't think there's a way to dedicate serial ports to domains.  It shouldn't 
be technically hard but nobody has wanted to do it before.  We'd take a patch 
to enable it but in the absence of that I'm afraid you'll have to work around 
this issue - most simple is probably to control the modem from dom0 and then 
allow the domU to access the resulting network connection.

Cheers,
Mark

On Wednesday 27 July 2005 12:57, mikee wrote:
> Hello,
> Recently I've been trying to setup domain which can use
> serial port (modem communication). First I had to struggle
> to setup working serial in domain 0 - besides "console=vga"
> parameter in grub I had to add fake com port parameters
> to prevent xen from stealing ttyS0 on default I/O&IRQ.
> Furthermore, parameter "xencons=off" must be passed to linux
> kernel, and then serial port in domain 0 works - I can
> "modprobe 8250", "setserial /dev/ttyS0 uart 16550A",
> "echo ATA > /dev/ttyS0" without problem. I compiled kernel
> to use in another domain - I used CONFIG_XEN_PRIVILEGED_GUEST=y
> and CONFIG_XEN_PHYSDEV_ACCESS=y, switched off PCI/ISA buses and
> all drivers except serial port. This kernel boots successfully
> in virtual machine and even serial driver pretends to load
> but fails to work - "setserial /dev/ttyS0 uart 16550A" triggers
> kernel message "ttyS0: LSR safety check engaged!". This happens
> of course when serial is not used (8250 module not loaded)
> in dom0. Am i missing something?
> (I am using testing xen-3-devel 2005-07-26)
>
> Regards,
> Michal
>
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