linux-kernel - Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not enough ram for it

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Message-ID: <CAKocOONhdcDG65MF9jaiM0Pi4RsXq1MaLtRfhqR7831K6QgC-w@mail.gmail.com>
Date:	Mon, 28 Jan 2013 19:27:14 -0700
From:	Shuah Khan <shuahkhan@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.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, Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v7u1 26/31] x86: Don't enable swiotlb if there is not
 enough ram for it

On Thu, Jan 24, 2013 at 2:50 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Thu, Jan 24, 2013 at 11:22 AM, Shuah Khan <shuahkhan@...il.com> wrote:
>>>
>>> I still have the AMD system I tested earlier versions of this work. I
>>> started compiles with these patches on 3.7 and will let you know the
>>> status.
>>
>> Tested 3.8-rc4 with the patches on AMD system with IOMMU on. Looks
>> good. I can't test low memory paths on this system very easily without
>> mucking with the code and force it treat it as low memory. So I just
>> tested the normal path. My main goal was to make sure AMD iommu driver
>> can still enable switolb and it does.
>
> good.
>
>>
>> If you would like to me test the error cases, please let me know.
>
> please check
> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git
> for-x86-boot
>
> and boot your test setups with memmap=4095$1M
>
> Thanks
>
> Yinghai

Yinghai,

Your for-x86-boot git boots on AMD system I have. However, with
memmap=4095$1M option, it panics very early in boot. I don't have
physical access to the console and I will try to get you the panic
information tomorrow.

-- Shuah
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