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Re: [PATCH 1/2] xen/*/nospec: Provide common versions of evaluate_nospec/block_speculation
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 5 Mar 2024 08:15:45 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 05 Mar 2024 07:15:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.03.2024 17:10, Andrew Cooper wrote:
> It is daft to require all architectures to provide empty implementations of
> this functionality.
>
> Provide evaluate_nospec() and block_speculation() unconditionally in
> xen/nospec.h with architectures able to opt in by providing suitable arch
> variants.
>
> Rename x86's implementation to the arch_*() variants.
>
> No functional change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Upon further thinking and with Julien's recent reply in mind:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Still I'd prefer if the arch_* were left out. They look to me to go this
half step too far (despite now having looked at patch 2 as well; I'll
reply there separately). And it is this which was why I decided that
going the other half step (moving these handful lines of code) wasn't
really worth it, when considering whether to make such a patch myself.
Jan
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