linux-kernel - Re: [PATCH v5 01/10] x86/microcode/intel: Expose collect_cpu_info

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Date:   Wed, 04 May 2022 12:28:26 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tony Luck <tony.luck@...el.com>, hdegoede@...hat.com,
        markgross@...nel.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, corbet@....net,
        gregkh@...uxfoundation.org, andriy.shevchenko@...ux.intel.com,
        jithu.joseph@...el.com, ashok.raj@...el.com, tony.luck@...el.com,
        rostedt@...dmis.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, patches@...ts.linux.dev,
        ravi.v.shankar@...el.com
Subject: Re: [PATCH v5 01/10] x86/microcode/intel: Expose
 collect_cpu_info_early() for IFS

On Thu, Apr 28 2022 at 08:38, Tony Luck wrote:
> From: Jithu Joseph <jithu.joseph@...el.com>
>
> IFS is a CPU feature that allows a binary blob, similar to microcode,
> to be loaded and consumed to perform low level validation of CPU
> circuitry. In fact, it carries the same Processor Signature
> (family/model/stepping) details that are contained in Intel microcode
> blobs.
>
> In support of an IFS driver to trigger loading, validation, and running
> of these tests blobs, make the functionality of cpu_signatures_match()
> and collect_cpu_info_early() available outside of the microcode driver.
>
> Add an "intel_" prefix and drop the "_early" suffix from
> collect_cpu_info_early() and EXPORT_SYMBOL_GPL() it. Add
> declaration to x86 <asm/cpu.h>
>
> Make cpu_signatures_match() an inline function in x86 <asm/cpu.h>,
> and also give it an "intel_" prefix.
>
> No functional change intended.
>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
> Co-developed-by: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>