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

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Date:	Sun, 07 Apr 2013 09:34:07 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave@...1.net>,
	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 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.

	-hpa

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