linux-kernel - Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support

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Message-ID: <CA+55aFyJ8hrR4x_HY7fyvj14V9_-M6_po1330hLnhJ_dTchi1g@mail.gmail.com>
Date:   Tue, 5 Sep 2017 16:09:01 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging
 support, Secure Memory Encryption support

On Tue, Sep 5, 2017 at 3:33 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> And one of those 18 is commit 10af6235e0d3 ("x86/mm: Implement PCID
> based optimization: try to preserve old TLB entries using PCID"),
> which I guess is where the problem might actually start showing up if
> it is pcid.

Yup, that's what it bisected down to in the end.

And then rebooting once more into that kernel, but with "nopcid" on
the command line, and it all works.

I'll go back to top-of-tree just to verify that 'nopcid' thing there
too, but it does seem pretty clear-cut.

                   Linus