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Re: [Xen-devel] [PATCH v6.5 25/26] x86/cpuid: Offer Indirect Branch Controls to guests

On Thu, Jan 04, 2018 at 12:15:54AM +0000, Andrew Cooper wrote:
> With all infrastructure in place, it is now safe to let guests see and use
> these features.  Allow AMD's IBPB to be set even on Intel hardware, so the
> toolstack can express "IBPB only" to guests.
> This also requires updating the libxc logic to understand the e8b feature
> leaf, which has the side effect of also offering CLZERO on applicable
> hardware.
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> v4:
>  * Adjust for AMD changes
> v5:
>  * Support for IBRB-only
> v6:
>  * Fix AMD CPUID
> ---
>  tools/libxc/xc_cpuid_x86.c                  | 4 +++-

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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