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Re: [PATCH v2 2/4] x86: clobber registers in switch_stack_and_jump() when !LIVEPATCH

To: Jan Beulich <jbeulich@xxxxxxxx>
From: Wei Liu <wl@xxxxxxx>
Date: Tue, 15 Dec 2020 16:28:49 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
Delivery-date: Tue, 15 Dec 2020 16:28:54 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Tue, Dec 15, 2020 at 05:12:12PM +0100, Jan Beulich wrote:
> In order to have the same effect on registers as a call to
> check_for_livepatch_work() may have, clobber all call-clobbered
> registers in debug builds.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Wei Liu <wl@xxxxxxx>

References:
- [PATCH v2 0/4] x86: XSA-348 follow-up
  - From: Jan Beulich
- [PATCH v2 2/4] x86: clobber registers in switch_stack_and_jump() when !LIVEPATCH
  - From: Jan Beulich

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