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Re: [PATCH v5 04/10] vpci: Refactor REGISTER_VPCI_INIT
- To: "Chen, Jiqian" <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 6 Jun 2025 09:05:48 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "Huang, Ray" <Ray.Huang@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Orzel, Michal" <Michal.Orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 06 Jun 2025 07:06:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.06.2025 08:29, Chen, Jiqian wrote:
> On 2025/6/5 20:50, Roger Pau Monné wrote:
>> On Mon, May 26, 2025 at 05:45:53PM +0800, Jiqian Chen wrote:
>>> + }; \
>>> + static vpci_capability_t *const finit##_entry \
>>> + __used_section(".data.vpci") = &finit##_t
>>
>> IMO this should better use .rodata instead of .data.
> Is below change correct?
>
> + static const vpci_capability_t *const finit##_entry \
> + __used_section(".rodata") = &finit##_t
No, specifically because ...
>> Not that it matters much in practice, as we place it in .rodata anyway. Note
>> however you will have to move the placement of the VPCI_ARRAY in the
>> linker script ahead of *(.rodata.*), otherwise that section match will
>> consume the vPCI data.
> I am sorry, how to move it ahead of *(.rodata.*) ?
> Is below change correct?
>
> diff --git a/xen/include/xen/xen.lds.h b/xen/include/xen/xen.lds.h
> index 793d0e11450c..3817642135aa 100644
> --- a/xen/include/xen/xen.lds.h
> +++ b/xen/include/xen/xen.lds.h
> @@ -188,7 +188,7 @@
> #define VPCI_ARRAY \
> . = ALIGN(POINTER_ALIGN); \
> __start_vpci_array = .; \
> - *(SORT(.data.vpci.*)) \
> + *(.rodata) \
... this isn't - you'd move _all_ of .rodata into here, which definitely
isn't what you want. What I understand Roger meant was a .rodata-like
section, e.g. .rodata.vpci.* (much like it was .data.vpci.* before).
Jan
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