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

From: Dave Hansen
Date: Mon Apr 08 2013 - 16:33:17 EST

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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