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Date: Tue, 11 Dec 2012 10:46:30 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Yinghai Lu <yinghai@kernel.org>
CC: Borislav Petkov <bp@alien8.de>, "Yu, Fenghua" <fenghua.yu@intel.com>,
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Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU
References: <3E5A0FA7E9CA944F9D5414FEC6C71220470F154E@ORSMSX105.amr.corp.intel.com> <CAE9FiQXGZYZiH3eUup2UXGWkeqKjsiHk7aMTFJO7xxFkqTpBZA@mail.gmail.com> <50C6AB63.9070008@zytor.com> <CAE9FiQX7sPLXOacoLakaJ1qC5UuSUbrX_g7N-oWmLYg5W-91UA@mail.gmail.com> <50C6D3DF.3030209@zytor.com> <CAE9FiQUiEx=p6wTC5wu_E=ih1CSBaTmw90zsc2=+xu6rMO5usg@mail.gmail.com> <20121211145716.GB8873@liondog.tnic> <CAE9FiQVByBTHwPrtYvVxv4u9QrtN1iN6GH9YaDn3dvmwv5Sg7g@mail.gmail.com> <50C763C2.5020603@zytor.com> <CAE9FiQUzHBb5SiEhfrOg7hFbuD1H1-7aXa0aTjhZ9tNqdrwGqw@mail.gmail.com> <20121211170605.GD28827@liondog.tnic> <CAE9FiQXOrH4POQESnGycSrf-7e5MhO9y1wfa7ZSEVr9TO_45ZA@mail.gmail.com> <50C7752C.2000709@zytor.com> <50C7795D.3000404@zytor.com> <CAE9FiQV03xToOaR3NcMtWDv=2MCMYwtY7p97BY3sAC1suYAhNA@mail.gmail.com>
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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