linux-kernel - Re: [PATCH v6 03/27] x86, boot: move verify_cpu.S and no

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Message-ID: <CAE9FiQUSoSvtFMMQt3eZkrXFCkzXhLu6GfqYMGNb3=uA052Axw@mail.gmail.com>
Date:	Tue, 18 Dec 2012 19:44:55 -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>,
	linux-kernel@...r.kernel.org, Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v6 03/27] x86, boot: move verify_cpu.S and no_longmode
 after 0x200

On Sat, Dec 15, 2012 at 9:06 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Dec 13, 2012 at 02:01:57PM -0800, Yinghai Lu wrote:
>> We are short of space before 0x200 that is entry for startup_64.
>
> And you're moving this down because of the couple of bytes the next
> patch is adding? If so, then explain that here.

better?

---
Subject: [PATCH] x86, boot: move verify_cpu.S and no_longmode down

We need to move some code with 32bit section in following patch:

   x86, boot: Move lldt/ltr out of 64bit code section

but that will push startup_64 down from 0x200.

According to hpa, we can not change startup_64 to other offset and
that become ABI now.

We could move function verify_cpu and no_longmode down, because
verify_cpu is used via function call and no_longmode will not
return.
---
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