linux-kernel - Re: [RFC PATCH 2/7] x86/entry: Add IST main stack

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Date:   Mon, 3 Apr 2023 09:21:27 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Lai Jiangshan <jiangshanlai@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Andy Lutomirski <luto@...nel.org>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Cfir Cohen <cfir@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        David Kaplan <David.Kaplan@....com>,
        David Rientjes <rientjes@...gle.com>,
        Dirk Hohndel <dirkhh@...are.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Jiri Slaby <jslaby@...e.cz>, Joerg Roedel <joro@...tes.org>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Tony Luck <tony.luck@...el.com>, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH 2/7] x86/entry: Add IST main stack

On Mon, Apr 3, 2023 at 7:05 AM Lai Jiangshan <jiangshanlai@...il.com> wrote:
>
> diff --git a/Documentation/x86/kernel-stacks.rst b/Documentation/x86/kernel-stacks.rst
> index 6b0bcf027ff1..be89acf302da 100644
> --- a/Documentation/x86/kernel-stacks.rst
> +++ b/Documentation/x86/kernel-stacks.rst
> @@ -105,6 +105,8 @@ The currently assigned IST stacks are:
>    middle of switching stacks.  Using IST for MCE events avoids making
>    assumptions about the previous state of the kernel stack.
>
> +* ESTACK_IST. bla bla
> +
>  For more details see the Intel IA32 or AMD AMD64 architecture manuals.

Maybe the cover letter description could be used here, rather than the
"bla bla" placeholder?

              Linus