linux-kernel - Re: [PATCH] do not try to sync identity map for non-mapped pages

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Date:	Mon, 08 Apr 2013 13:33:12 -0700
From:	Dave Hansen <dave@...1.net>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	penguin-kernel@...ove.sakura.ne.jp, x86@...nel.org,
	akpm@...ux-foundation.org, suresh.b.siddha@...el.com,
	khlebnikov@...nvz.org, bhelgaas@...gle.com
Subject: Re: [PATCH] do not try to sync identity map for non-mapped pages

On 04/07/2013 09:34 AM, H. Peter Anvin wrote:
> On 04/07/2013 06:33 AM, Borislav Petkov wrote:
>> looks like we haven't whacked all the moles - I keep seeing this when
>> testing 32-bit builds in qemu on latest Linus + tip. I'd guess this is
>> still that /dev/mem accessing thing called wdm.
>>
>> I'm still wondering though whether we should BUG_ON on a /dev/mem
>> access?
> 
> 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.

I've got a set sitting around collecting dust that I've got to post.  It
should at least restore sanity for /dev/mem on x86.  I'll have it out
for some initial review tomorrow.
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