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Re: [PATCH v2 35/39] xen/riscv: add basic VGEIN management for AIA guests
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
- Date: Wed, 23 Sep 2026 18:06:24 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, 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>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
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On Thu, 27 Aug 2026 17:21:19 +0200, Oleksii Kurochko
<oleksii.kurochko@xxxxxxxxx> wrote:
> It was decided to add support for IMSIC from the start instead of having APLIC
> operate in direct delivery mode, as it requires a trap-and-emulation approach,
> which is not optimal from a performance standpoint.
>
> AIA provides a hardware-accelerated mechanism for delivering external
> interrupts to domains via "guest interrupt files" located in IMSIC.
> A single physical hart can implement multiple such files (up to GEILEN),
> allowing several virtual harts to receive interrupts directly from hardware.
>
> [...]
Reviewed-by: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
--
Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
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