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

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Message-ID: <AANLkTimtH41djAF5OxXCeVS8cHg_JCBd+wQ1iT1BUWgX@mail.gmail.com>
Date:	Mon, 16 Aug 2010 12:58:52 +0800
From:	huang ying <huang.ying.caritas@...il.com>
To:	"H. Peter Anvin" <hpa@...or.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

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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