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Re: [Xen-devel] [PATCH v4 4/8] x86/XPTI: use %r12 to write zero into xen_cr3

To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Juergen Gross <jgross@xxxxxxxx>
Date: Wed, 21 Mar 2018 08:52:01 +0100
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Delivery-date: Wed, 21 Mar 2018 07:52:07 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 19/03/18 14:39, Jan Beulich wrote:
> Now that we zero all registers early on all entry paths, use that to
> avoid a couple of immediates here.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Tested-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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References:
- [Xen-devel] [PATCH v4 0/8] x86: Meltdown band-aid overhead reduction
  - From: Jan Beulich

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