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Re: [PATCH v2 2/4] xen/arm: its: separate ITS and host LPI quirk scopes
- To: Mykola Kvach <xakep.amatop@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Wed, 22 Jul 2026 13:56:24 +0200
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- Cc: Mykola Kvach <mykola_kvach@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Luca Fancellu <luca.fancellu@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 22 Jul 2026 11:56:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28-May-26 02:25, Mykola Kvach wrote:
> From: Mykola Kvach <mykola_kvach@xxxxxxxx>
>
> ITS quirks can impose restrictions on memory accessed by the ITS itself and
> on shared host LPI/Redistributor state. These scopes are not identical, so
> a single global ITS quirk state makes the host LPI policy depend implicitly
> on the quirks seen while initializing host ITSes.
>
> Add per-ITS quirk_flags to struct host_its and keep a separate
> host_lpi_flags state in the LPI code. The quirk table now records the
> ITS-private and host LPI scopes explicitly through its_flags and lpi_flags.
> The R-Car Gen4 quirk applies the same memory-related restrictions to both
> scopes, preserving the existing behavior without relying on an implicit
> aggregation step.
>
> This also removes the old assumption that all host ITSes must expose the
> same quirk state. Host LPI restrictions are accumulated only from quirk
> entries that explicitly set lpi_flags.
>
> Use per-ITS quirk_flags for GITS_CBASER, GITS_BASER<n> and ITT allocations.
> Use host_lpi_flags directly in gic-v3-lpi.c for GICR_PROPBASER and
> GICR_PENDBASER setup. Memory-related quirk bits are named GICV3_QUIRK_MEM_*
> and are translated by shared gicv3_mem_get_*() helpers.
>
> Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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