linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Message-ID: <50C77F86.5010207@zytor.com>
Date:	Tue, 11 Dec 2012 10:46:30 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Borislav Petkov <bp@...en8.de>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...ux.intel.com" <hpa@...ux.intel.com>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On 12/11/2012 10:42 AM, Yinghai Lu wrote:
> 
> now in for-x86-boot:
> http://git.kernel.org/?p=linux/kernel/git/yinghai/linux-yinghai.git;a=commit;h=8e4e093e6d140f1316953437fdde4e826f5cfd98
> 
> it adds extra mapping from the whole kernel when kernel is loaded above 1G.
> from round_down(_text, 2M) to round_up(_end -1, 2M).
> 
> Do you mean we need to add extra mapping for realmode_data, cmdline,
> ramdisk too? (not include setup_data, and it is accessed via
> early_ioremap later).

Yes, but...

> but if the user memmap to exclude some page, we will still need to
> relocate the ramdisk.

-ENOPARSE

I really need to look at this in more detail.  I'm starting to think
this is done completely backwards.

	-hpa


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