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Re: [PATCH for-4.22 v2 2/2] docs/arm: Document GICv3 vCPU limit for host-layout domains
- To: Mykola Kvach <xakep.amatop@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Wed, 27 May 2026 08:56:42 +0200
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- Cc: Mykola Kvach <mykola_kvach@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Wed, 27 May 2026 06:57:20 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27-May-26 03:18, Mykola Kvach wrote:
> From: Mykola Kvach <mykola_kvach@xxxxxxxx>
>
> The number of vCPUs requested for a boot-time Arm domain is not bounded
> solely by Xen's generic domain limits. For GICv3 domains using the host
> memory layout, Xen can only create vCPUs whose virtual redistributor
> frame is covered by redistributor MMIO regions exposed for that layout.
>
> This can affect the hardware domain and direct-mapped domains. Document
> the GICv3-specific limit in the `cpus` property description in the Arm
> device-tree booting guide. Also add a generic domain-limit caveat to the
> `dom0_max_vcpus` command-line documentation.
>
> Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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