From: "H. Peter Anvin" <hpa@zytor.com>
To: Matthew Garrett <mjg@redhat.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org, matt.fleming@intel.com
Subject: Re: [PATCH] EFI: Only set regions uncacheable if they support it
Date: Thu, 15 Mar 2012 07:00:06 -0700 [thread overview]
Message-ID: <4F61F5E6.8060509@zytor.com> (raw)
In-Reply-To: <1331819798-1955-1-git-send-email-mjg@redhat.com>
On 03/15/2012 06:56 AM, Matthew Garrett wrote:
> The EFI memory region attributes field indicates whether the region can
> be mapped with various cache attributes. Our current implementation always
> marks regions uncacheable if they don't have the writeback support flag.
> This causes us to mark some regions uncacheable even if they don't
> indicate support for being uncacheable, triggering a clflush that may cause
> an MCE. Ensure we only do this for regions which support it.
>
> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Could you be specific as to what you're seeing in the field? In
particular, what *do* these memory regions claim to support?
-hpa
next prev parent reply other threads:[~2012-03-15 14:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-15 13:56 Matthew Garrett
2012-03-15 14:00 ` H. Peter Anvin [this message]
2012-03-15 14:07 ` Matthew Garrett
2012-03-15 14:17 ` H. Peter Anvin
2012-03-15 14:24 ` Matthew Garrett
2012-03-15 14:28 ` H. Peter Anvin
2012-03-15 14:33 ` Matthew Garrett
2012-03-15 14:36 ` H. Peter Anvin
2012-03-15 14:42 ` Matthew Garrett
2012-03-15 14:47 ` H. Peter Anvin
2012-03-15 14:54 ` Matthew Garrett
2012-03-15 14:51 ` Alan Cox
2012-03-15 14:54 ` Alan Cox
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