linux-kernel - Re: [PATCH 1/1] x86/platform/UV: Fix critical UV MMR address error

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Date:   Wed, 28 Mar 2018 11:29:23 -0700
From:   Mike Travis <mike.travis@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     Ingo Molnar <mingo@...hat.com>,
        Russ Anderson <russ.anderson@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Andrew Banman <andrew.banman@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] x86/platform/UV: Fix critical UV MMR address error



On 3/28/2018 11:17 AM, Thomas Gleixner wrote:
> On Wed, 28 Mar 2018, mike.travis@....com wrote:
> 
>> A critical error was found testing the fixed UV4 HUB in that an MMR
>> address was found to be incorrect.  This causes the virtual address
>> space for accessing the MMIOH1 region to be allocated with the
>> incorrect size.
> 
> Even if this is not intended for stable, despite the diff

Yes, I realized I missed 'stable' a moment or two after hitting send.
> 
>> --- linux-4.4.orig/arch/x86/include/asm/uv/uv_mmrs.h
>> +++ linux-4.4/arch/x86/include/asm/uv/uv_mmrs.h
> 
> suggesting that this is against a kernel, which receives respiration
> treatment, it would be appreciated if you could add a Fixes tag next time.

Sorry I didn't know about that.  Here it is:

Commit-ID:  673aa20c55a138621d1340d343cd6b07c1cb4e92
Gitweb: 
https://.kernel.org/tip/673aa20c55a13862git1d1340d343cd6b07c1cb4e92
Author:     Mike Travis <mike.travis@....com>
AuthorDate: Mon, 8 Jan 2018 13:39:59 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 16 Jan 2018 03:58:36 +0100

x86/platform/UV: Update uv_mmrs.h to prepare for UV4A fixes

Regenerate uv_mmrs.h file to accommodate fixes to UV4A MMRs.
> 
> That spares me the time to figure out which commit introduced the wreckage
> and therefore the scope of the fix. Added it myself.

Oh, well the above should be the same as what you found.
> 
> Thanks,
> 
> 	tglx

Thank You!
> 
>> @@ -3833,7 +3833,7 @@ union uvh_rh_gam_mmioh_overlay_config0_m
>>   #define UV1H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR uv_undefined("UV1H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR")
>>   #define UV2H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR uv_undefined("UV2H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR")
>>   #define UV3H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR 0x1603000UL
>> -#define UV4H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR 0x483000UL
>> +#define UV4H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR 0x484000UL
>>   #define UVH_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR (				\
>>   	is_uv1_hub() ? UV1H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR :		\
>>   	is_uv2_hub() ? UV2H_RH_GAM_MMIOH_OVERLAY_CONFIG1_MMR :		\
>>
>> -- 
>>