linux-kernel - Re: [PATCH V2] x86/mce: Fix set_mce

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Message-ID: <CA+55aFyu0gwg4hSmx7yMmryGb0EKYfg7Jp3FE9YafR9U=7v9Ng@mail.gmail.com>
Date:   Fri, 31 Aug 2018 09:57:59 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Tony Luck <tony.luck@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Peter Anvin <hpa@...or.com>,
        Borislav Petkov <bp@...en8.de>,
        linux-edac <linux-edac@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>
Subject: Re: [PATCH V2] x86/mce: Fix set_mce_nospec() to avoid #GP fault

Ack. This looks good with the big comment and explanation.

             Linus

On Fri, Aug 31, 2018 at 9:55 AM Luck, Tony <tony.luck@...el.com> wrote:
>
> The trick with flipping bit 63 to avoid loading the address of the
> 1:1 mapping of the poisoned page while we update the 1:1 map used
> to work when we wanted to unmap the page. But it falls down horribly
> when we try to directly set the page as uncacheable.
> [ ... ]