Date: Thu, 4 Jan 2018 19:50:33 +0100
From: Borislav Petkov <bp@alien8.de>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@intel.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/7] x86/microcode: Recheck IBRS features on microcode
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Message-ID: <20180104185033.tsbijx32as6wqvye@pd.tnic>
References: <cover.1515086770.git.tim.c.chen@linux.intel.com>
 <a2092889d6d2198494d97a341ea0375a95d3b3bd.1515086770.git.tim.c.chen@linux.intel.com>
 <20180104182858.2nevvgeq5wdojz2w@pd.tnic>
 <20180104183430.GJ13348@redhat.com>
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On Thu, Jan 04, 2018 at 07:34:30PM +0100, Andrea Arcangeli wrote:
> void spec_ctrl_rescan_cpuid(void)
> {
> 	int cpu;
> 
> 	if (use_ibp_disable)
> 		return;
> 	mutex_lock(&spec_ctrl_mutex);
> 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL ||
> 	    boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
> 		/* detect spec ctrl related cpuid additions */
> 		init_scattered_cpuid_features(&boot_cpu_data);

You don't need to noodle through all the scattered features - just the
two bits.

-- 
Regards/Gruss,
    Boris.

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