Re: [Xen-devel] [PATCH 5/9] x86/amd: Probe for legacy SSBD interfaces on boot

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.12.18 at 17:18, <andrew.cooper3@xxxxxxxxxx> wrote:
> --- a/xen/include/asm-x86/cpufeatures.h
> +++ b/xen/include/asm-x86/cpufeatures.h
> @@ -25,6 +25,7 @@ XEN_CPUFEATURE(XEN_SMAP,        (FSCAPINTS+0)*32+11) /* 
> SMAP gets used by Xen it
>  XEN_CPUFEATURE(LFENCE_DISPATCH, (FSCAPINTS+0)*32+12) /* lfence set as 
> Dispatch Serialising */
>  XEN_CPUFEATURE(IND_THUNK_LFENCE,(FSCAPINTS+0)*32+13) /* Use IND_THUNK_LFENCE 
> */
>  XEN_CPUFEATURE(IND_THUNK_JMP,   (FSCAPINTS+0)*32+14) /* Use IND_THUNK_JMP */
> +XEN_CPUFEATURE(LEGACY_SSBD,     (FSCAPINTS+0)*32+15) /* LS_CFG or 
> VIRT_SPEC_CTRL available for SSBD */

As already indicated in another reply, with there not being
any alternatives patching based on this, I don't think it should
be a synthetic feature. Use an ordinary bool variable instead.

Jan



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