linux-kernel - Re: [PATCH] Fix devmem_is_allowed for below 1MB accesses for an efi machine

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Date:	Wed, 3 Oct 2012 06:28:03 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, T Makphaibulchoke <tmac@...com>,
	tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
	akpm@...ux-foundation.org, yinghai@...nel.org, tiwai@...e.de,
	viro@...iv.linux.org.uk, aarcange@...hat.com, tony.luck@...el.com,
	mgorman@...e.de, weiyang@...ux.vnet.ibm.com,
	octavian.purdila@...el.com, paul.gortmaker@...driver.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] Fix devmem_is_allowed for below 1MB accesses for an
 efi machine

On Tue, Oct 02, 2012 at 11:13:17PM -0600, Thavatchai Makphaibulchoke wrote:

> Sounds like a better solution is to allow accesses to only I/O regions 
> presented in the EFI memory map for physical addresses below 1 MB.

That won't work - unfortunately we do still need the low region to be 
available for X because some platforms expect us to use int10 even on 
EFI (yes, yes, I know). Do you have a copy of the EFI memory map for a 
system that's broken with the current code?

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