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Re: [Xen-devel] [PATCH] x86/HVM: XSETBV intercept needs to check CPL on SVM only

To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date: Fri, 27 Nov 2015 13:21:09 +0000
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Aravind Gopalakrishnan <aravind.gopalakrishnan@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Delivery-date: Fri, 27 Nov 2015 13:21:29 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 27/11/15 11:01, Jan Beulich wrote:
> VMX doesn't need a software CPL check on the XSETBV intercept, and
> SVM can do that check without resorting to hvm_get_segment_register().
>
> Clean up what is left of hvm_handle_xsetbv(), namely make it return a
> proper error code.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Your statement matches the statement in the manual.

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

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References:
- [Xen-devel] [PATCH] x86/HVM: XSETBV intercept needs to check CPL on SVM only
  - From: Jan Beulich

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