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Re: [PATCH v5 17/26] xen/riscv: introduce minimal virtual APLIC (vAPLIC) infrastructure
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 9 Jul 2026 17:39:46 +0200
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- Cc: Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, 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.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 09 Jul 2026 15:39:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.07.2026 17:57, Oleksii Kurochko wrote:
> At the current development stage, only domain vINTC init and deinit
> operations are required, so implement those first.
>
> Initialize vAPLIC's domaincfg to with the interrupt-enable bit set and
> MSI delivery mode selected as the current solution is exepcted to have
> always IMSIC, and initialize vintc->ops.
How would domaincfg be initialized on real hardware? I can see that maybe
firmware would have to set DM suitably (and you may mean to take firmware's
role here). But isn't setting at least IE entirely the OSes responsibility?
> --- a/xen/arch/riscv/include/asm/aplic.h
> +++ b/xen/arch/riscv/include/asm/aplic.h
> @@ -15,6 +15,8 @@
>
> #include <asm/imsic.h>
>
> +/* domaincfg bits 31:24 are read-only 0x80 */
> +#define APLIC_DOMAINCFG_RO (0x80U << 24)
Bit 7 is also documented as read-only 0. Wouldn't the comment better reflect
that as well?
> #define APLIC_DOMAINCFG_IE BIT(8, U)
> #define APLIC_DOMAINCFG_DM BIT(2, U)
Wouldn't you better spell out BE as well?
Jan
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