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Re: [PATCH v3 3/4] x86/traps: use entry_ssp in fixup_exception_return()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 2 Jul 2026 15:22:56 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 02 Jul 2026 14:23:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02/07/2026 11:55 am, Jan Beulich wrote:
> With the value recorded on entry there's no need anymore to go hunt for
> the respective exception frame on the shadow stack. By deriving "ptr"
> from that field (without any offset), it then ends up pointing one slot
> lower than before. Therefore all array indexes need incrementing, nicely
> doing away with all the negative ones.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
The diff isn't easy going, but the end result nicer.
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> Indentation of the prior inner (but not innermost) if()'s body is
> deliberately left untouched, to aid review. It'll be adjusted in a
> separate follow-on patch.
There are two indentations needing removing. Deferring to another patch
is fine, but it would be nice to be in this series.
~Andrew
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