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Re: [PATCH 3/4] xen/xsm: Use __init_data_cf_clobber for xsm_ops
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 3 Dec 2021 05:32:14 -0500
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- Cc: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 03 Dec 2021 10:33:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/26/21 4:22 PM, 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>
Reviewed-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
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