Re: [PATCH v17 06/23] x86/cpu/intel: Detect SGX support and update caps appropriately

[Dave Hansen]

On 11/15/18 5:01 PM, Jarkko Sakkinen wrote:
> +static void detect_sgx(struct cpuinfo_x86 *c)
> +{
> +	unsigned long long fc;
> +
> +	rdmsrl(MSR_IA32_FEATURE_CONTROL, fc);
> +	if (!(fc & FEATURE_CONTROL_LOCKED)) {
> +		pr_err_once("sgx: IA32_FEATURE_CONTROL MSR is not locked\n");
> +		goto out_unsupported;
> +	}

This needs a check against the config option somewhere so the compiler
can toss it in its entirety if SGX is config'd out.