Re: [Xen-devel] [PATCH v8 13/17] x86/boot: Calculate the most appropriate BTI mitigation to use

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 01/12/2018 01:01 PM, Andrew Cooper wrote:
>  
> +    if ( boot_cpu_has(X86_FEATURE_IBRSB) )
> +    {
> +        /*
> +         * Even if we've chosen to not have IBRS set in Xen context, we still
> +         * need the IBRS entry/exit logic to virtualise IBRS support for
> +         * guests.
> +         */
> +        if ( ibrs )
> +            setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_SET);
> +        else
> +            setup_force_cpu_cap(X86_FEATURE_XEN_IBRS_CLEAR);
> +    }
>

Are you going to add support for Intel's "Enhanced IBRS" (I think that's
what they call the "always on" mode")?

-boris

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