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Re: [PATCH for-4.19] gnttab: fix compat query-size handling
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 25 Jun 2024 09:40:35 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Tue, 25 Jun 2024 07:40:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.06.2024 09:30, Jan Beulich wrote:
> The odd DEFINE_XEN_GUEST_HANDLE(), inconsistent with all other similar
> constructs, should have caught my attention. Turns out it was needed for
> the build to succeed merely because the corresponding #ifndef had a
> typo. That typo in turn broke compat mode guests, by having query-size
> requests of theirs wire into the domain_crash() at the bottom of the
> switch().
>
> Fixes: 8c3bb4d8ce3f ("xen/gnttab: Perform compat/native gnttab_query_size
> check")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> Looks like set-version is similarly missing in the set of structures
> checked, but I'm pretty sure that we will now want to defer taking care
> of that until after 4.20 was branched.
Actually it's get-version too, yet then for both only half of what's needed
that's missing (and luckily only the just-in-case part, not the actual layout
check). In any event I've queued a patch for 4.20.
Jan
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