linux-kernel - Re: [PATCH 1/7] x86/feature: Detect the x86 feature to control Speculation

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Date:   Fri, 05 Jan 2018 11:14:42 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] x86/feature: Detect the x86 feature to control
 Speculation

On Thu, 2018-01-04 at 09:56 -0800, Tim Chen wrote:
> cpuid ax=0x7, return rdx bit 26 to indicate presence of this feature
> IA32_SPEC_CTRL (0x48) and IA32_PRED_CMD (0x49)
> IA32_SPEC_CTRL, bit0 – Indirect Branch Restricted Speculation (IBRS)
> IA32_PRED_CMD,  bit0 – Indirect Branch Prediction Barrier (IBPB)

In a previous iteration of these patches, hadn't you already merged
support for the AMD variant? Where'd that go?
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