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Re: [PATCH 08/14] Arm/guestcopy: deviate copy_guest() uses just like their x86 counterparts
- To: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 21 Sep 2026 14:15:57 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Mon, 21 Sep 2026 12:15:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.09.2026 13:46, Nicola Vetrini wrote:
> On 2026-09-02 08:33, Jan Beulich wrote:
>> Like x86/HVM's __hvm_copy(), Arm's copy_guest() is used for both
>> to-guest
>> and from-guest copying. Naturally in the latter case the hypervisor
>> buffer
>> needs writing to, hence the function parameter cannot be
>> pointer-to-const.
>>
>> No functional change intended.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Reviewed-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
Thanks.
> See comment below, but I can do as a follow-up if you'd like.
>
>> ---
>> Of course for both the pre-existing x86 deviation and the new Arm one
>> it
>> might be more robust if the deviation was also limited to the
>> respective
>> source file. Can this be expressed together with the needed regex?
>
> Yes, e.g.
>
> -config=MC3A2.R11.8,reports+={safe,"any_area(any_loc(file(^xen/arch/arm/...$)&&text(^.*copy_guest.*COPY_to_guest
>
> doesn't modify.*$)))"}
>
> not compile-tested, so YMMV.
Yes, please make this a follow-up, then also covering the x86 counterpart.
Jan
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