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Re: [PATCH v6 2/7] x86/alternatives: serialize after (self-)modifying code
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Mon, 23 Jun 2025 18:18:18 -0400
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 23 Jun 2025 22:20:58 +0000
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On 2025-06-16 08:59, Jan Beulich wrote:
While supposedly safe via enforcing a control flow change when modifying
already prefetched code, it may not really be. Afaik a request is
pending to drop the first of the two options in the SDM's "Handling
Self- and Cross-Modifying Code" section (still present there as of
version 087). Insert a serializing instruction there, and remove the
"noinline" in exchange.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
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