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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