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Re: [PATCH v2 03/39] xen/riscv: set the guest's XLEN explicitly in hstatus.VSXL
- To: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 1 Sep 2026 17:16:57 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Zheng Zhang <zhangzheng@xxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, 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@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Tue, 01 Sep 2026 15:17:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.08.2026 14:48, Baptiste Le Duc wrote:
>> hstatus.VSXL is WARL, so its reset value is implementation-defined. Xen
>> supports 64-bit guests only, so program it explicitly instead of relying
>> on whatever the hardware happens to leave there.
>>
>> This matters beyond the guest's own view of itself: decoding a trapped
>> instruction depends on the effective XLEN of the guest, as the encodings
>> which exist for XLEN=64 only must not be recognized for a 32-bit one.
>>
> It's not clear which instruction "decoding a trapped instruction" refers
> to without more context.
Use "decoding of trapped instructions" instead? (I think I'd prefer the
paragraph to remain here.)
Jan
> I assume you mean decode_ldst_insn() in
> emulate.c, but the patch introducing that function comes later in the
> series, so this isn't obvious on a first read.
>
> Please reorder the series so this patch follows the one introducing
> decode_ldst_insn(), or reference it explicitly in the commit message
> (e.g. "load/store trap emulation, introduced later in this series in
> emulate.c, needs...").
>
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