linux-kernel - Re: [PATCH v7u1 21/31] x86, kexec: only set ident mapping for ram.

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Message-ID: <CAE9FiQXve8SnpzC4i212SaU5j6HtNWiMNnaQhfnjfG4UzXDJYQ@mail.gmail.com>
Date:	Sun, 13 Jan 2013 21:46:17 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH v7u1 21/31] x86, kexec: only set ident mapping for ram.

On Sun, Jan 13, 2013 at 4:56 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Jan 03, 2013 at 04:48:41PM -0800, Yinghai Lu wrote:
>> We should not set mapping for all under max_pfn.
>
> "We should not establish mappings for all memory under max_pfn."

that is not accurate.

We should not set mapping for all range under max_pfn.

or

We should set mappings only for memory ranges under max_pfn.

>
>> That causes same problem that is fixed by
>
> "Otherwise, it causes the same ..."
>
>>
>>       x86, mm: Only direct map addresses that are marked as E820_RAM
>
> You could add this patch's commit id since it is in tip:x86/mm2 and it
> shouldn't change: 66520ebc2df3.

why ? they are not in linus tree yet, so it could change if that tip
branch is rebased.

>
> Ditto for patch 09/31, "x86, 64bit: #PF handler set page to cover 2M only".


>
>>
>> This patch expose pfn_mapped array, and only set ident mapping for ranges
>
>              exposes the...                    sets
>
>> in that array.
>>
>> This patch rely on new ident_mapping_init that could handle existing
>
>              relies on the new
>
>> pgd/pud between different calling.
>
>                             calls.
>

ok, fix those problems
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