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

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Message-ID: <20180112123223.us2iygz6twype2sr@pd.tnic>
Date:   Fri, 12 Jan 2018 13:32:24 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     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>,
        David Woodhouse <dwmw@...zon.co.uk>,
        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 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?

-- 
Regards/Gruss,
    Boris.

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