Date: Sun, 7 Apr 2013 19:25:45 +0200
From: Borislav Petkov <bp@alien8.de>
To: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Dave Hansen <dave@sr71.net>, linux-kernel@vger.kernel.org,
        penguin-kernel@i-love.sakura.ne.jp, x86@kernel.org,
        akpm@linux-foundation.org, suresh.b.siddha@intel.com,
        khlebnikov@openvz.org, bhelgaas@google.com
Subject: Re: [PATCH] do not try to sync identity map for non-mapped pages
Message-ID: <20130407172545.GF31299@pd.tnic>
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	"H. Peter Anvin" <hpa@linux.intel.com>, Dave Hansen <dave@sr71.net>,
	linux-kernel@vger.kernel.org, penguin-kernel@i-love.sakura.ne.jp,
	x86@kernel.org, akpm@linux-foundation.org,
	suresh.b.siddha@intel.com, khlebnikov@openvz.org,
	bhelgaas@google.com
References: <20130307163151.D9B58C4E@kernel.stglabs.ibm.com>
 <20130407133346.GD31299@pd.tnic>
 <51619FFF.30705@linux.intel.com>
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On Sun, Apr 07, 2013 at 09:34:07AM -0700, H. Peter Anvin wrote:
> We shouldn't, no. /dev/mem really needs to be fixed along a bunch of
> axes. Yes, it is privileged and extra creepy, but it should either
> work or it should fail cleanly.

Can't we filter out accesses through /dev/mem and not BUG_ON in
__phys_addr() if they come through /dev/mem? Simply fail cleanly. No
idea whether we'll break something still reading /dev/mem though.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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