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

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Date:   Wed, 31 Jan 2018 17:28:46 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Eduardo Habkost <ehabkost@...hat.com>
Cc:     "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christophe de Dinechin <christophe.de.dinechin@...il.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        KarimAllah Ahmed <karahmed@...zon.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        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>,
        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>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        KVM list <kvm@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support
 infrastructure

On Wed, Jan 31, 2018 at 12:44:41PM -0200, Eduardo Habkost wrote:
> Also, if anybody don't like it, users can already specify, e.g.,
> "Broadwell,-hle,-rtm" or "Skylake,+spec_ctrl".
> 
> QEMU only adds have the -noTSX and -IBRS CPU for convenience of
> management systems that don't know how to check/configure
> individual CPU features.  We're working with libvirt and
> OpenStack folks to make this kind of trick unnecessary.

Yeah, defining separate CPU models just for that seems hacky. The
+/-<feature> specification looks like the Right Thing(tm) to do.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--