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Re: [Xen-devel] [PATCH v2] x86/xsave: simplify xcomp_bv initialization

To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date: Wed, 13 Jan 2016 10:59:54 +0000
Cc: Keir Fraser <keir@xxxxxxx>, Shuai Ruan <shuai.ruan@xxxxxxxxxxxxxxx>
Delivery-date: Wed, 13 Jan 2016 11:00:08 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 13/01/16 07:30, Jan Beulich wrote:
> This simplifies a number of pointless conditionals: Bits 0 and 1 of
> xcomp_bv don't matter anyway, and as long as none of bits 2..62 are
> set, setting bit 63 is pointless too unless XSAVES is in use.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

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References:
- [Xen-devel] [PATCH v2] x86/xsave: simplify xcomp_bv initialization
  - From: Jan Beulich

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