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Date:   Thu, 30 Aug 2018 18:29:11 -0700
From:   Linus Torvalds <>
To:     Tony Luck <>
Cc:     Thomas Gleixner <>,
        Ingo Molnar <>, Peter Anvin <>,
        Borislav Petkov <>,
        linux-edac <>,
        Linux Kernel Mailing List <>,
        "the arch/x86 maintainers" <>,
        Dan Williams <>,
        Dave Jiang <>
Subject: Re: [PATCH] x86/mce: Fix set_mce_nospec() to avoid #GP fault

On Thu, Aug 30, 2018 at 2:45 PM Tony Luck <> wrote:
> Fix is to move one step at a time. First mark the page not present
> (using the decoy address). Then it is safe to use the actual address
> of the 1:1 mapping to mark it "uc", and finally as present.

Can't we do it in one step, but make sure that he clflush gets the real address?


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