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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>
From: Wei Liu <wei.liu2@xxxxxxxxxx>
Date: Thu, 22 Mar 2018 10:07:03 +0000
Cc: Juergen Gross <jgross@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Delivery-date: Thu, 22 Mar 2018 10:07:09 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Mon, Mar 19, 2018 at 07:39:34AM -0600, 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>

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

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References:
- [Xen-devel] [PATCH v4 0/8] x86: Meltdown band-aid overhead reduction
  - From: Jan Beulich
- [Xen-devel] [PATCH v4 4/8] x86/XPTI: use %r12 to write zero into xen_cr3
  - From: Jan Beulich

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