linux-kernel - Re: [PATCH 9/10] Vmi timer update.patch

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Message-ID: <461C0F76.1070308@vmware.com>
Date:	Tue, 10 Apr 2007 15:28:06 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Chris Wright <chrisw@...s-sol.org>, Andrew Morton <akpm@...l.org>,
	Andi Kleen <ak@....de>, Rusty Russell <rusty@...tcorp.com.au>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dan Hecht <dhecht@...are.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 9/10] Vmi timer update.patch

Jeremy Fitzhardinge wrote:
> Why not submit a patch to do what you need here?  (The Geode comment is
> a bit worrying though.)
>   

Why should VMI add workaround into PIT code?  PIT code wants to know 
nothing about VMI.  It understands PIT timers on hardware.  VMI, on the 
other hand, is special - it knows exactly what hardware platform it has 
and can manipulate hardware freely.  On a generic platform, surely touch 
PIT I/O ports would be quite ill behavior.  But side effects of that on 
a vastly restricted platform are predictable based on the hardware and 
kernel, and we would not add a workaround outside of VMI unless it was 
really necessary or generally useful.

Zach
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