linux-kernel - Re: [RFC,05/10] x86/speculation: Add basic IBRS support infrastructure

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Message-ID: <20180129213749.GS26209@tassilo.jf.intel.com>
Date:   Mon, 29 Jan 2018 13:37:49 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Arjan van de Ven <arjan@...ux.intel.com>,
        Eduardo Habkost <ehabkost@...hat.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        linux-kernel@...r.kernel.org,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Laura Abbott <labbott@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        x86@...nel.org, "Dr. David Alan Gilbert" <dgilbert@...hat.com>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure

> The question is about all the additional RSB-frobbing and call depth
> counting and other bits that don't really even exist for Skylake yet in
> a coherent form.

We have had several patch kits posted that all are in a "coherent form"

That was the original one

http://lkml.iu.edu/hypermail/linux/kernel/1801.1/05556.html

and that's the newer one with only interrupt stuffing

https://marc.info/?l=linux-kernel&m=151674718914504

We don't have generic deep chain handling yet, but everything else
is there.

-Andi