Re: [PATCH v2 2/4] xen/arm: its: separate ITS and host LPI quirk scopes

On 28-May-26 02:25, Mykola Kvach wrote:
> From: Mykola Kvach <[email protected]>
> 
> 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 <[email protected]>
Reviewed-by: Michal Orzel <[email protected]>

~Michal