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Re: [Xen-users] Multiple Serial Port Passthrough in HVM domU

To: "Trolle Selander" <trolle.selander@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Multiple Serial Port Passthrough in HVM domU
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Mon, 07 Jun 2010 08:29:49 -0600
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>>> On 2010/06/03 at 16:47, Trolle Selander <trolle.selander@xxxxxxxxx> wrote: 
> Hi Nick,
> There's been several suggestions on how to handle multiple emulated
> serial ports in the config file, but as far as I can tell from a quick
> look at XendConfig.py, none of them have made it into the tree. It's
> still doable, however - simply create a qemu-dm "wrapper" that adds
> multiple -serial options to the qemu-dm commandline, and change the
> device_model line to point to the wrapper.
> -- Trolle

Thanks for the hint - I did this, but I'm wondering if there's a limitation on 
the number of serial ports?  The Qemu man page, from the most recent version of 
Qemu, indicates that a maximum of 4 serial devices can be used.  However, 
Windows in my Xen domU only sees two of the four devices that I've attempted to 
pass through, so I'm wondering if the qemu-dm version included with Xen 4 only 
supports 2??


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