linux-kernel - Re: [PATCH v7u1 00/31] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

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Message-ID: <CAE9FiQUGMTLDyTZTsaHFaVc0VF7JoNPkPAWQGXq3OUdn9jir6Q@mail.gmail.com>
Date:	Wed, 16 Jan 2013 10:20:53 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>, Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH v7u1 00/31] x86, boot, 64bit: Add support for loading
 ramdisk and bzImage above 4G

On Wed, Jan 16, 2013 at 9:38 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 01/16/2013 09:31 AM, Yinghai Lu wrote:
>>
>>
>
> The first sentence here doesn't parse, and this description doesn't give any
> hint to anyone who is researching this code in say, five years, what
> problems this caused.
>
> I can't really figure it out, either; from looking at the thread and the
> patch I'm assuming the problem is somehow that the code failed to use the
> last page in the brk buffer, which somehow lead to a Xen boot failure... but
> the bits from here to there are totally unclear.

ok, let me try again.
tip:x86/mm2 does not fail on xen testing from Stefano and Konrad.

Stefano found booting failure with PV xen with for-x86-boot.

for-x86-boot has one patch that is trying to get back an wasted page
in pre-allocated BRK
and that cause xen pv fails with 2G setup.
that patch just uncover one bug in x86/mm2.

So questions:
1. do we need to rebase x86/mm2 to fold the two patches in. ?
2. or just put fixes at beginning for-x86-boot ?

Thanks

Yinghai
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