linux-kernel - Re: [PATCH][EFI] Run EFI in physical mode

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Message-ID: <8f5e697c-e9ae-4453-aa7a-7086dd156cc9@email.android.com>
Date:	Sun, 15 Aug 2010 22:08:43 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	huang ying <huang.ying.caritas@...il.com>
CC:	Takao Indoh <indou.takao@...fujitsu.com>,
	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, tglx@...utronix.de, mingo@...hat.com,
	vgoyal@...hat.com, nhorman@...driver.com
Subject: Re: [PATCH][EFI] Run EFI in physical mode

For the 1:1 map we probably should make all pages executable; other things need it too, but we shouldn't have it mapped in except when needed.

"huang ying" <huang.ying.caritas@...il.com> wrote:

>On Mon, Aug 16, 2010 at 11:27 AM, H. Peter Anvin <hpa@...or.com> wrote:
>> No, it should not be dynamic; rather we should unify all the users who need a 1:1 map and just keep that page table set around.
>
>Agree. One known issue of global 1:1 map is that we need to make at
>least part of page table PAGE_KERNEL_EXEC for EFI runtime code, and
>change_page_attr can not be used before page allocator is available.
>
>Best Regards,
>Huang Ying

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