linux-kernel - Re: [PATCH] x86_64: disable identity mappings statically

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Date:	Fri, 11 Feb 2011 20:35:18 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: disable identity mappings statically

On 02/11/2011 08:07 PM, Jiri Olsa wrote:
> On Fri, Feb 11, 2011 at 08:46:41AM -0800, Eric W. Biederman wrote:
>> Jiri Olsa <jolsa@...hat.com> writes:
>>
>>> hi,
>>>
>>> while browsing the page table setup code, I noticed the x86_64 head
>>> code might not need the identity mappings at all.
>>> It seems it's ok to switch it off completely from the begining,
>>> unless I'm missing something.
>>
>> Have you tested it?
> 
> yes, I booted it with no problem
> 

Hi Jiri, just wonder -- hibernation still works after that?
Also Xen might/might-not need it as well, and walk_pgd_level
seems to use it as well, no?

-- 
    Cyrill
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