linux-kernel - Re: "Bad pagetable: 000c" crashes and errata "Not-Present Page Faults May Set the RSVD Flag in the Error Code"

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Date:   Mon, 20 Jun 2022 11:00:55 +0300
From:   Vasily Averin <vvs@...nvz.org>
To:     Dave Hansen <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
Cc:     kernel@...nvz.org, Konstantin Khorenko <khorenko@...tuozzo.com>,
        steve.sipes@...andsolutions.com, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: "Bad pagetable: 000c" crashes and errata "Not-Present Page Faults
 May Set the RSVD Flag in the Error Code"

On 6/20/22 10:18, Dave Hansen wrote:
> On 6/19/22 22:29, Vasily Averin wrote:
>> Some (old?) Intel CPU's have errata:
>> "Not-Present Page Faults May Set the RSVD Flag in the Error Code
> 
> Do you happen to have a link to the actual erratum document?  It's
> usually a "Specification Update" for some model or another.

For Intel Xeon E5400 used on affected node:
https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-5400-spec-update.pdf
Intel® Xeon® Processor 5400 Series
Specification Update
August 2013
Document Number: 318585-021

page 39
AX74. Not-Present Page Faults May Set the RSVD Flag in the Error Cod

Later I've found similar articles for another processors too.

Thank you,
	Vasily Averin