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

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Date:   Mon, 22 Jan 2018 13:36:59 +0000
From:   "Woodhouse, David" <dwmw@...zon.co.uk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Borislav Petkov <bp@...e.de>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...ux.intel.com>,
        "Andrea Arcangeli" <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Arjan van de Ven" <arjan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        "Asit Mallick" <asit.k.mallick@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "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>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>, <kvm@...r.kernel.org>,
        <x86@...nel.org>
Subject: Re: [RFC 05/10] x86/speculation: Add basic IBRS support
 infrastructure

On Mon, 2018-01-22 at 14:30 +0100, Greg Kroah-Hartman wrote:
> We kind of do, you can submit patches to UEFI, but I doubt that the
> processor-specific portions are actually present in the Tianocore code
> to be able to be patched.

This is just about which microcode your BIOS loads into the CPU before
booting the OS. It's not "process-specific portions in the Tianocore
code"; more a data blob — just like when Linux updates microcode.

> What about LinuxBoot <https://linuxboot.org>, does it too take over too
> late in the boot process to control this?

Yes, I believe microcode updates are done in PEI which is before
LinuxBoot takes over.
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