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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: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Date: Mon, 30 Nov 2015 13:33:22 -0500
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Keir Fraser <keir@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Aravind Gopalakrishnan <aravind.gopalakrishnan@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>
Delivery-date: Mon, 30 Nov 2015 18:33:32 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 11/27/2015 06:01 AM, 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>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>



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

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