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: <CAE9FiQUFQ2zxQXaMcTPsiq-3aXWs4LpBoN5XaX4c9sy2sGfEfQ@mail.gmail.com>
Date:	Wed, 16 Jan 2013 18:35:02 -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 10:20 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> 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 ?
>

I updated for-x86-boot branch via second path.
    git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
for-x86-boot
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