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Re: [Xen-users] Is Xen and Qemu serial driver code related ?

To: "Aleš Rom" <ales.rom@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Is Xen and Qemu serial driver code related ?
From: "Henning Sprang" <henning_sprang@xxxxxx>
Date: Thu, 8 Feb 2007 14:05:34 +0100
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On 2/8/07, Aleš Rom <ales.rom@xxxxxxxxxxxx> wrote:

A noticed a very strange thing. A few weeks ago I installed WindowsXP
under qemu. I have serial device attached to COM1 port and comunication
Basicaly I have to download a few hundred bytes from that serial device
to computer. Every time comunication stops at 83% (5/6).

The weird thing is, that when I use Xen, I can see exactly same thing.
Stops at 83%. Is this related or just coincidence? Is it my hardware?
Windows on "real" hardware doesn't have this problem.

I don't too much about the details of serial consoles in Xen and Qemu,
but I know that Xen uses qemu code to emulate the parts that currently
aren't included in hardware supported virtualization - which is
everything but memory(right?) and CPU.
As long as you don't install paravirtual IO drivers in windows (which
AFAIK you get with XenEnterprise products), you use qemu-derived IO
emulation. Likely that this is also valid for serial ports, and so you
see the same problems.


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