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Re: [PATCH v3 3/4] x86/traps: use entry_ssp in fixup_exception_return()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 2 Jul 2026 16:28:09 +0200
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- Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 02 Jul 2026 14:28:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.07.2026 16:22, Andrew Cooper wrote:
> 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>
Thanks.
>> ---
>> 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.
Can do for v4. I just didn't want to do this more than once.
Jan
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