Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2

[David Woodhouse]

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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