linux-kernel - Re: [PATCH v3 6/6] x86/cpufeature: Blacklist SPEC

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Date:   Wed, 24 Jan 2018 22:29:45 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Greg KH <gregkh@...ux-foundation.org>
Cc:     David Woodhouse <dwmw@...zon.co.uk>, arjan@...ux.intel.com,
        tglx@...utronix.de, karahmed@...zon.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        bp@...en8.de, peterz@...radead.org, pbonzini@...hat.com,
        ak@...ux.intel.com, torvalds@...ux-foundation.org,
        dave.hansen@...el.com, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 6/6] x86/cpufeature: Blacklist SPEC_CTRL on early
 Spectre v2 microcodes


> On Wed, Jan 24, 2018 at 04:57:05PM +0000, David Woodhouse wrote:

> > +static const struct sku_microcode spectre_bad_microcodes[] = {
> > +	{ INTEL_FAM6_KABYLAKE_DESKTOP, 0x0B, 0x80 },
> > +	/* Corrected typo in Intel doc */
> > +	{ INTEL_FAM6_KABYLAKE_DESKTOP, 0x0A, 0x80 },
> > +	{ INTEL_FAM6_KABYLAKE_MOBILE, 0x0A, 0x80 },
> > +	{ INTEL_FAM6_KABYLAKE_MOBILE, 0x09, 0x80 },
> > +	{ INTEL_FAM6_KABYLAKE_DESKTOP, 0x09, 0x80 },
> > +	{ INTEL_FAM6_SKYLAKE_X, 0x04, 0x0200003C },
> > +	{ INTEL_FAM6_SKYLAKE_MOBILE, 0x03, 0x000000C2 },
> > +	{ INTEL_FAM6_SKYLAKE_DESKTOP, 0x03, 0x000000C2 },
> > +	{ INTEL_FAM6_BROADWELL_CORE, 0x04, 0x28 },
> > +	{ INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x0000001B },
> > +	{ INTEL_FAM6_HASWELL_ULT, 0x01, 0x21 },
> > +	{ INTEL_FAM6_HASWELL_GT3E, 0x01, 0x18 },
> > +	{ INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
> > +	{ INTEL_FAM6_IVYBRIDGE_X, 0x04, 0x42a },
> > +	{ INTEL_FAM6_HASWELL_X, 0x02, 0x3b },
> > +	{ INTEL_FAM6_HASWELL_X, 0x04, 0x10 },
> > +	{ INTEL_FAM6_HASWELL_CORE, 0x03, 0x23 },
> > +	{ INTEL_FAM6_BROADWELL_XEON_D, 0x02, 0x14 },
> > +	{ INTEL_FAM6_BROADWELL_XEON_D, 0x03, 0x7000011 },
> > +	{ INTEL_FAM6_BROADWELL_GT3E, 0x01, 0x0000001B },
> > +	{ INTEL_FAM6_BROADWELL_X, 0x01, 0x0b000025 },
> > +	/* Dropped repeat of KBL Desktop 906E9, 0x80 */
> > +	{ INTEL_FAM6_SKYLAKE_X, 0x03, 0x0100013e },
> > +	/* Dropped repeat of SKX 50654, 0x200003c */

Could we please also get better tabulation of this array, so that the general 
layout of the values is easier to see? It's also prettier:

	{ INTEL_FAM6_KABYLAKE_DESKTOP,		0x09, 0x00000080 },
	{ INTEL_FAM6_SKYLAKE_X,			0x04, 0x0200003C },
	{ INTEL_FAM6_SKYLAKE_MOBILE,		0x03, 0x000000C2 },
	{ INTEL_FAM6_SKYLAKE_DESKTOP,		0x03, 0x000000C2 },

Note the vertical spacing and the fixed length of each column.

(We can ignore the col80 for things like this.)

Thanks,

	Ingo