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Re: [Xen-devel] [PATCH v2] x86/CPUID: don't override tool stack decision to hide STIBP


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 28 May 2018 15:01:36 +0100
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  • Cc: Juergen Gross <jgross@xxxxxxxx>
  • Delivery-date: Mon, 28 May 2018 14:01:51 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 28/05/18 08:08, Jan Beulich wrote:
> Other than in the feature sets, where we indeed want to offer the
> feature even if not enumerated on hardware, we shouldn't dictate the
> feature being available if tool stack or host admin have decided to not
> expose it (for whatever [questionable?] reason). That feature set side
> override is sufficient to achieve the intended guest side safety
> property (in offering - by default - STIBP independent of actual
> availability in hardware).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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