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Re: [PATCH for-4.20] xen/arm: dom0less: Add #redistributor-regions property to GICv3 node
- To: Michal Orzel <michal.orzel@xxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Thu, 4 Jul 2024 08:39:44 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Thu, 04 Jul 2024 08:40:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH for-4.20] xen/arm: dom0less: Add #redistributor-regions property to GICv3 node
> On 4 Jul 2024, at 08:54, Michal Orzel <michal.orzel@xxxxxxx> wrote:
>
> Dom0less domain using host memory layout may use more than one
> re-distributor region (d->arch.vgic.nr_regions > 1). In that case Xen
> will add them in a "reg" property of a GICv3 domU node. Guest needs to
> know how many regions to search for, and therefore the GICv3 dt binding
> [1] specifies that "#redistributor-regions" property is required if more
> than one redistributor region is present. However, Xen does not add this
> property which makes guest believe, there is just one such region. This
> can lead to guest boot failure when doing GIC SMP initialization. Fix it
> by adding this property, which matches what we do for hwdom.
>
> [1] Linux:
> Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
>
> Fixes: 4809f9ec7d71 ("xen/arm: if direct-map domain use native addresses for
> GICv3")
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
> ---
Looks good to me!
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
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