linux-kernel - Re: 4.15-rc6 PTI regression: L1 TLB mismatch MCE on Athlon64

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Date:   Wed, 3 Jan 2018 13:42:06 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Meelis Roos <mroos@...ux.ee>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        x86@...nel.org, linux-edac@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: 4.15-rc6 PTI regression: L1 TLB mismatch MCE on Athlon64

On Wed, Jan 03, 2018 at 11:16:48AM +0200, Meelis Roos wrote:
> ---[ ESPfix Area ]---
> 0xffffff0000000000-0xffffff1800000000          96G                               pud
> 0xffffff1800000000-0xffffff1800009000          36K                               pte
> 0xffffff1800009000-0xffffff180000a000           4K     ro                     NX pte
> 0xffffff180000a000-0xffffff1800019000          60K                               pte
> 0xffffff1800019000-0xffffff180001a000           4K     ro                     NX pte
> 0xffffff180001a000-0xffffff1800029000          60K                               pte
> 0xffffff1800029000-0xffffff180002a000           4K     ro                     NX pte
> 0xffffff180002a000-0xffffff1800039000          60K                               pte
> 0xffffff1800039000-0xffffff180003a000           4K     ro                     NX pte
> 0xffffff180003a000-0xffffff1800049000          60K                               pte
> 0xffffff1800049000-0xffffff180004a000           4K     ro                     NX pte
> 0xffffff180004a000-0xffffff1800059000          60K                               pte
> 0xffffff1800059000-0xffffff180005a000           4K     ro                     NX pte
> 0xffffff180005a000-0xffffff1800069000          60K                               pte
> 0xffffff1800069000-0xffffff180006a000           4K     ro                     NX pte
> 0xffffff180006a000-0xffffff1800079000          60K                               pte
> ... 131059 entries skipped ... 
> ---[ High Kernel Mapping ]---
> 0xffffffff80000000-0xffffffff81e00000          30M                               pmd
> 0xffffffff81e00000-0xffffffff82000000           2M     ro         PSE     GLB x  pmd

Ha, this must be it. What I said yesterday about the guard hole
hypervisor range was wrong because we're looking at VA slice [47:12] and
this one matches:

Hex: 0xffffffff81e00000
1111_1111_1111_1111_1111_1111_1111_1111_1000_0001_1110_0000_0000_0000_0000_0000
63   59   55   51   47   43   39   35   31   27   23   19   15   11   7    3

Hex: 0x0000ffff81e000e0
0000_0000_0000_0000_1111_1111_1111_1111_1000_0001_1110_0000_0000_0000_1110_0000
63   59   55   51   47   43   39   35   31   27   23   19   15   11   7    3

So that's at offset 0xe0 in that 2M page in the high kernel mapping.

tglx, ideas?

-- 
Regards/Gruss,
    Boris.

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