linux-kernel - RE: [PATCH 1/1] x86/mm: Forbid the zero page once it has uncorrectable errors

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Date:   Thu, 21 Apr 2022 07:53:58 +0000
From:   "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
To:     "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "Luck, Tony" <tony.luck@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>
CC:     "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:HWPOISON MEMORY FAILURE HANDLING" <linux-mm@...ck.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] x86/mm: Forbid the zero page once it has
 uncorrectable errors

> From: Hansen, Dave <dave.hansen@...el.com>
> ...
> Subject: Re: [PATCH 1/1] x86/mm: Forbid the zero page once it has
> uncorrectable errors
> ...
> There are lots of pages which are entirely fatal if they have uncorrectable errors.
> On my laptop, if there were an error, there is a 0.00000596% chance it will be in
> the zero page.
> 
> Why is this worth special casing this one page?

Hi Dave,

   Yes, this is a rare problem. Just feel that the fix is simple, so post it here to see whether you'll consider it 😊.

Thanks!
-Qiuxu