linux-kernel - Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre

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Message-ID: <1517950494.3677.30.camel@infradead.org>
Date:   Tue, 06 Feb 2018 20:54:54 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     whiteheadm@....org, Guenter Roeck <linux@...ck-us.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hugh Dickins <hughd@...gle.com>, dave.hansen@...ux.intel.com,
        jikos@...nel.org, Borislav Petkov <bp@...en8.de>,
        Kees Cook <keescook@...omium.org>,
        Jamie Iles <jamie@...ieiles.com>, eduval@...zon.com,
        labbott@...hat.com, Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [BUG] x86 : i486 reporting to be vulnerable to
 Meltdown/Spectre_V1/Spectre_V2

On Tue, 2018-02-06 at 15:45 -0500, tedheadster wrote:
> 
> If that is correct (and I might be wrong), then I am up to date and I
> am still getting the following in /proc/cpuinfo on my Pentium 4M i686:
> 
> bugs  : cpu_meltdown spectre_v1 spectre_v2

That's expected for now. The CPUs we exempt are as follows:

static const __initdata struct x86_cpu_id cpu_no_speculation[] = {
	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_CEDARVIEW,	X86_FEATURE_ANY },
	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_CLOVERVIEW,	X86_FEATURE_ANY },
	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_LINCROFT,	X86_FEATURE_ANY },
	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_PENWELL,	X86_FEATURE_ANY },
	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_PINEVIEW,	X86_FEATURE_ANY },
	{ X86_VENDOR_CENTAUR,	5 },
	{ X86_VENDOR_INTEL,	5 },
	{ X86_VENDOR_NSC,	5 },
	{ X86_VENDOR_ANY,	4 },
	{}
};

Alan is going to improve that list, but your Pentium 4 isn't on it yet.

The bugs went away on the 486 though, right?
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