linux-kernel - Re: [PATCH v2] x86/mce: set MCE_IN_KERNEL

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Message-ID: <20230602160138.GDZHoSYsWoPAinMszk@fat_crate.local>
Date:   Fri, 2 Jun 2023 18:01:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Song, Youquan" <youquan.song@...el.com>,
        "naoya.horiguchi@....com" <naoya.horiguchi@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "chu, jane" <jane.chu@...cle.com>
Subject: Re: [PATCH v2] x86/mce: set MCE_IN_KERNEL_COPYIN for all MC-Safe Copy

On Fri, Jun 02, 2023 at 03:12:30PM +0000, Luck, Tony wrote:
> > As mentioned above, I am focus on copy_mc_XXX calling, it will
> > abort if the exception fires when accessing the source, and we
> > want to isolate the corrupted src page, maybe we could a new flag
> > to indicate this scenario, the *Final Goals* is to let core
> > do_machine_check to deal with the corrupted src page.
> 
> A new flag seems like a good direction.

Before anything happens here, the fate of the now unused EX_TYPE_COPY
needs to be decided first. Then new stuff.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette