linux-kernel - RE: [PATCH v9 3/7] mce: fix set_mce_nospec to always unmap the whole page

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Date:   Wed, 11 May 2022 17:17:21 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>,
        "Williams, Dan J" <dan.j.williams@...el.com>
CC:     Jane Chu <jane.chu@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>, david <david@...morbit.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vivek Goyal <vgoyal@...hat.com>, Jue Wang <juew@...gle.com>
Subject: RE: [PATCH v9 3/7] mce: fix set_mce_nospec to always unmap the whole
 page

> I - just like you - am waiting for Tony to say whether he still needs
> this whole_page() thing. I already suggested removing it so I'm fine
> with this patch.

IIRC this new patch effectively reverts back to the original behavior that
I implemented back at the dawn of time. I.e. just always mark the whole
page "not present" and don't try to mess with UC mappings to allow
partial (but non-speculative) access to the not-poisoned parts of the
page.

If that is the case ... then Acked-by: Tony Luck <tony.luck@...el.com>

If I've misunderstood ... then please explain what it is doing.

Thanks

-Tony