linux-kernel - Problems with serial interrupts with IPMI 2.0 SoL

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Date:	Thu, 10 Dec 2009 13:45:54 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Keir Fraser <keir.fraser@...citrix.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Problems with serial interrupts with IPMI 2.0 SoL

Hi,

I'm using a system with an embedded IPMI 2.0 BMC which provides SoL 
(Supermicro X8SIL-F).  This works fine under Linux (fully interrupt 
driven), but fails for Xen as it appears to not be sending interrupts; 
it works OK if I set the driver to polling mode.

I'm assuming the Xen is tickling some bug in the emulated 16550.  The 
Linux driver has a couple of pieces of code to explicitly work around 
bugs in the Intel AMT SoL implementation, but I don't think they're 
coming into play here (because there are no Intel SoL PCI devices on 
this system to trigger the NO_TXEN_TEST flag).

I'm wondering if you have any pointers or suggestions about more subtle 
problems?

Thanks,
     J
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