linux-kernel - Re: [PATCH 5/5] x86/feature: Detect the x86 feature Indirect Branch Prediction Barrier

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Message-ID: <1515760769.22302.445.camel@amazon.co.uk>
Date:   Fri, 12 Jan 2018 12:39:29 +0000
From:   "Woodhouse, David" <dwmw@...zon.co.uk>
To:     Borislav Petkov <bp@...en8.de>, Ashok Raj <ashok.raj@...el.com>
CC:     <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Tim Chen" <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "Andrea Arcangeli" <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Arjan Van De Ven" <arjan.van.de.ven@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>
Subject: Re: [PATCH 5/5] x86/feature: Detect the x86 feature Indirect
 Branch Prediction Barrier

On Fri, 2018-01-12 at 13:32 +0100, Borislav Petkov wrote:
> On Thu, Jan 11, 2018 at 05:32:19PM -0800, Ashok Raj wrote:
> > cpuid ax=0x7, return rdx bit 26 to indicate presence of both
> > IA32_SPEC_CTRL(MSR 0x48) and IA32_PRED_CMD(MSR 0x49)
> 
> So why do we need two X86_FEATURE flags then?

AMD has only the latter and enumerates them differently.
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