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Re: [Xen-devel] [PATCH 06/10] x86/spec_ctrl: Split X86_FEATURE_SC_MSR into PV and HVM variants

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Wei Liu <wei.liu2@xxxxxxxxxx>
Date: Mon, 14 May 2018 16:22:40 +0100
Cc: Juergen Gross <jgross@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Mon, 14 May 2018 15:23:25 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Fri, May 11, 2018 at 11:38:10AM +0100, Andrew Cooper wrote:
> In order to separately control whether MSR_SPEC_CTRL is virtualised for PV and
> HVM guests, split the feature used to control runtime alternatives into two.
> Xen will use MSR_SPEC_CTRL itself if either of these features are active.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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

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References:
- [Xen-devel] [PATCH for-4.11 00/10] x86: Improvements and fixes to Spectre handling
  - From: Andrew Cooper
- [Xen-devel] [PATCH 06/10] x86/spec_ctrl: Split X86_FEATURE_SC_MSR into PV and HVM variants
  - From: Andrew Cooper

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