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Re: [PATCH 3/4] xen/xsm: Use __init_data_cf_clobber for xsm_ops
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 1 Dec 2021 09:21:16 +0100
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- Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 01 Dec 2021 08:21:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.11.2021 22:22, Andrew Cooper wrote:
> All calls through xsm_ops are fully altcall'd. Harden all fnptr targets.
>
> This yields:
>
> (XEN) altcall: Optimised away 197 endbr64 instructions
>
> of 1655 on an everything-enabled build of Xen, which is ~12%.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Subject to the resolution of the const aspect
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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