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Re: [PATCH v2 3/3] xen/riscv: add RISC-V virtual SBI base extension support for guests
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Dec 2025 08:43:36 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 22 Dec 2025 07:43:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.12.2025 21:34, Oleksii Kurochko wrote:
> On 12/18/25 3:32 PM, Jan Beulich wrote:
>> On 17.12.2025 17:54, Oleksii Kurochko wrote:
>>> --- a/xen/arch/riscv/include/asm/sbi.h
>>> +++ b/xen/arch/riscv/include/asm/sbi.h
>>> @@ -14,6 +14,10 @@
>>>
>>> #include <xen/cpumask.h>
>>>
>>> +#define XEN_SBI_VER_MAJOR 0
>>> +#define XEN_SBI_VER_MINOR 2
>>> +#define XEN_SBI_IMPID 7
>> Are these numbers part of the spec (sorry, lack of a reference makes me
>> wonder,
>> plus if that were the case, I'd kind of expect the names to be SBI_XEN_...,
>> not
>> XEN_SBI_...)?
>
> XEN_SBI_IMPID is a number defined by the SBI specification:
>
> https://github.com/riscv-non-isa/riscv-sbi-doc/blob/master/src/ext-base.adoc#sbi-implementation-ids
I see. For this the name change below is then appropriate; for ...
> XEN_SBI_VER_MAJOR and XEN_SBI_VER_MINOR somehow also is a part of the spec,
> there is
> no such defines explicitly, but it is real numbers of the SBI version.
... these two I'm unconvinced, otoh: If it is us to control the versions
used here, the present names should imo remain. Brief comments may then
also want adding to clarify the different origin of the numbers.
Jan
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