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Re: [PATCH v3 27/39] xen/riscv: handle the case when no vCPU migration is needed
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
- Date: Thu, 22 Oct 2026 14:39:43 +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>
- Delivery-date: Thu, 22 Oct 2026 12:39:59 +0000
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On Wed, 30 Sep 2026 18:23:46 +0200, Oleksii Kurochko
<oleksii.kurochko@xxxxxxxxx> wrote:
> The scheduler moves a vCPU's interrupts (arch_move_irqs(), i.e.
> imsic_migrate_vcpu()) ahead of context_switch() whenever the unit is
> picked up by a pCPU other than the one it was assigned to, which can
> already happen for a freshly created vCPU on its very first run. No IMSIC
> h/w interrupt file has been mapped for such a vCPU yet, so there is
> nothing to migrate: return early while its last_cpu is still CPU_NONE,
> i.e. while it hasn't run.
>
> [...]
Reviewed-by: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
--
Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
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