On 01/25/2018 08:14 AM, David Woodhouse wrote:
> +static bool __init early_cpu_vulnerable_meltdown(struct cpuinfo_x86 *c)
> +{
> + u64 ia32_cap = 0;
> +
> + if (x86_match_cpu(cpu_no_meltdown))
> + return false;
> +
> + if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
> + rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
> +
> + /* Rogue Data Cache Load? No! */
> + if (ia32_cap & ARCH_CAP_RDCL_NO)
> + return false;
> +
> + return true;
> +}
Feel free to add my ack on this. It looks fine to me. I'll test and
submit any necessary fixes once I actually get a system that has this bit.
