linux-kernel - Re: [PATCH] EFI: Only set regions uncacheable if they support it

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Message-ID: <20120315142445.GA4357@srcf.ucam.org>
Date:	Thu, 15 Mar 2012 14:24:46 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	matt.fleming@...el.com
Subject: Re: [PATCH] EFI: Only set regions uncacheable if they support it

On Thu, Mar 15, 2012 at 07:17:56AM -0700, H. Peter Anvin wrote:
> On 03/15/2012 07:07 AM, Matthew Garrett wrote:
> > 
> > I have a report of a system that fails to boot with an MCE during EFI 
> > setup. The memory range is marked reserved and claims not to support any 
> > caching type, which I think probably translates as "Don't do anything to 
> > this region ever".
> > 
> 
> In other words, "don't map me"... not something we really support at the
> moment, but perhaps we should; at least until we find systems in the
> field that break with that constraint :(

Mapping should be harmless as long as we then don't touch it? I can't 
think of any circumstances where we would.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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