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Re: [PATCH v4 15/25] xen/riscv: introduce per-vCPU IMSIC state
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 29 Jun 2026 16:54:54 +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: Mon, 29 Jun 2026 14:55:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.06.2026 17:46, Oleksii Kurochko wrote:
> @@ -312,6 +318,35 @@ static int imsic_parse_node(const struct dt_device_node
> *node,
> return 0;
> }
>
> +int vcpu_imsic_init(struct vcpu *v)
> +{
> + struct vimsic_state *imsic_state;
> +
> + /* Allocate IMSIC context */
> + imsic_state = xvzalloc(struct vimsic_state);
> + if ( !imsic_state )
> + return -ENOMEM;
> +
> + v->arch.vimsic_state = imsic_state;
May I suggest that you make the pointer globally visible only after ...
> + /* Setup IMSIC context */
> + rwlock_init(&imsic_state->vsfile_lock);
> +
> + /*
> + * xvzalloc() already cleared the context, so guest_file_id == 0, i.e.
> the
> + * always-available s/w IMSIC VS-file. Only vsfile_pcpu needs an explicit
> + * initializer as its s/w VS-file value is NR_CPUS rather than 0.
> + */
> + imsic_state->vsfile_pcpu = NR_CPUS;
... having set up fields? Then:
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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