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Re: [PATCH for-4.19] gnttab: fix compat query-size handling
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 25 Jun 2024 11:31:06 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Tue, 25 Jun 2024 09:31:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.06.2024 11:24, Roger Pau Monné wrote:
> On Tue, Jun 25, 2024 at 09:30:07AM +0200, 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>
>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
>> ---
>> 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.
>
> If we have to backport the fix anyway, we might as well consider
> taking it now.
While I put a Fixes: tag there, this is the kind of change where I don't
think it needs backporting. The ABI of released versions is supposed to
be yet less in flux than the "stable" ABI in general.
Jan
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