linux-kernel - Re: [PATCH v6 00/16] x86/mtrr: fix handling with PAT but without MTRR

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Date:   Wed, 31 May 2023 09:28:57 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-hyperv@...r.kernel.org, linux-doc@...r.kernel.org,
        mikelley@...rosoft.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, Jonathan Corbet <corbet@....net>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v6 00/16] x86/mtrr: fix handling with PAT but without MTRR

On 30.05.23 17:28, Borislav Petkov wrote:
> On Mon, May 22, 2023 at 04:17:50PM +0200, Juergen Gross wrote:
>> The attached diff is for patch 13.
> 
> Merged and pushed out into same branch.
> 
> Next issue. Diffing /proc/mtrr shows:
> 
> --- proc-mtrr.6.3	2023-05-30 17:00:13.215999483 +0200
> +++ proc-mtrr.after	2023-05-30 16:01:38.281997816 +0200
> @@ -1,8 +1,8 @@
>   reg00: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
> -reg01: base=0x080000000 ( 2048MB), size=  512MB, count=1: write-back
> +reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
>   reg02: base=0x0a0000000 ( 2560MB), size=  256MB, count=1: write-back
>   reg03: base=0x0ae000000 ( 2784MB), size=   32MB, count=1: uncachable
> -reg04: base=0x100000000 ( 4096MB), size= 4096MB, count=1: write-back
> +reg04: base=0x100000000 ( 4096MB), size=  256MB, count=1: write-back
>   reg05: base=0x200000000 ( 8192MB), size= 8192MB, count=1: write-back
>   reg06: base=0x400000000 (16384MB), size= 1024MB, count=1: write-back
>   reg07: base=0x440000000 (17408MB), size=  256MB, count=1: write-back
> 

Weird.

Can you please boot the system with the MTRR patches and specify "mtrr=debug"
on the command line? I'd be interested in the raw register values being read
and the resulting memory type map.


Juergen

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