linux-kernel - Re: Re: [3.18+] Can't boot with commit bd809af1 ("x86: Enable PAT to use cache mode translation tables")

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Date:	Tue, 16 Dec 2014 04:40:08 +0000 (GMT)
From:	Jongman Heo <jongman.heo@...sung.com>
To:	Juergen Gross <jgross@...e.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Re: [3.18+] Can't boot with commit bd809af1
 ("x86: Enable PAT to use cache mode translation tables")

>------- Original Message -------
>Sender : Juergen Gross<jgross@...e.com>
>Date : 2014-12-15 20:52 (GMT+09:00)
>Title : Re: [3.18+] Can't boot with commit bd809af1 ("x86: Enable PAT to use cache mode translation tables")
>
>On 12/15/2014 08:52 AM, Jongman Heo wrote:
>>> ------- Original Message -------
>>> Sender : Juergen Gross
>>> Date : 2014-12-15 14:04 (GMT+09:00)
>>> Title : Re: [3.18+] Can't boot with commit bd809af1 ("x86: Enable PAT to use cache mode translation tables")
>>>
>>> On 12/14/2014 06:07 AM, 허종만 wrote:
>>>>
>>>> Hi,
>>>>
>>>> My Linux virtual machine on (Windows) VMWare workstation 10 can't boot with following commit.
>>>>
>>>> commit bd809af16e3ab1f8d55b3e2928c47c67e2a865d2
>>>> Author: Juergen Gross
>>>> Date:   Mon Nov 3 14:02:03 2014 +0100
>>>>
>>>>       x86: Enable PAT to use cache mode translation tables
>>>>
>>>> Unfortunately I can't see any console log.
>>>
>>> Hmm, weird. Could you provide some more information?
>>>
>>> Kernel config, hardware used, /proc/cpuinfo of working kernel?
>>> Anything you see with earlyprintk enabled?
>>>
>>>
>>> Juergen
>> 
>> (Sorry for resending this email, previous one bounced from mailing list due to HTML format)
>> 
>> Hi,
>> 
>> I'm using Fedora 21, with custom built kernel.
>> Host PC is windows 7 64-bit, and running VMWare workstation 10 for guest Fedora Linux.
>> 
>> With earlyprintk, just following message is printed.
>> 
>>    early console in setup code
>> 
>> and nothing more...
> 
> Can you try attached diagnostic patch, please? I suspect a problem
> regarding VMWares PAT emulation...
> 
> 
> Juergen

Hi, 

With the commit reverted, the patch doesn't apply.
Without revert, kernel (patch applied) doesn't boot and I can't see any message.

Let me show you my PAT values (the commit reverted)

# dmesg | grep PAT
[    0.000000] x86 PAT enabled: cpu 0, old 0x0, new 0x7010600070106
[    0.314631] x86 PAT enabled: cpu 3, old 0x0, new 0x7010600070106
[    0.314703] x86 PAT enabled: cpu 1, old 0x0, new 0x7010600070106
[    0.314780] x86 PAT enabled: cpu 2, old 0x0, new 0x7010600070106
[    0.314852] x86 PAT enabled: cpu 4, old 0x0, new 0x7010600070106
[    0.314923] x86 PAT enabled: cpu 0, old 0x0, new 0x7010600070106
[    0.314997] x86 PAT enabled: cpu 6, old 0x0, new 0x7010600070106
[    0.315069] x86 PAT enabled: cpu 7, old 0x0, new 0x7010600070106
[    0.315142] x86 PAT enabled: cpu 5, old 0x0, new 0x7010600070106