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

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Date:   Fri, 2 Jun 2023 15:12:30 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Borislav Petkov <bp@...en8.de>,
        "Song, Youquan" <youquan.song@...el.com>
CC:     "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

> 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. Re-using the existing
MCE_IN_KERNEL_COPYIN one happens to work now, but
is causing confusing now (since this case isn't a copy-from-user)
and may cause code maintenance issues in the future.

-Tony