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+55aFwi2yin3Cx-STCtuu8fKkK+OBfteppSQbYCOMyUSf_c1w@mail.gmail.com>
Date:   Tue, 5 Sep 2017 14:45:01 -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 2:40 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> Does your laptop CPU have PCID support by any chance? The CPU coming
> out of resume with PCID disabled and us not properly re-enabling it
> might be a possible failure mode.

It does have pcid. It's a -7-6560U in the prev-gen XPS 13 (aka "9350").

I have bisected a bit deeper, and the pcid code is definitely in that
bisection window still. But are a fair number of other commits (about
160 right now)

               Linus