Ping: Re: [PATCH 0/4] xen/arm: ITS quirk handling fixes and board-specific matches

[Mykola Kvach <xakep.amatop@xxxxxxxxx>]

Hi all,

Gentle ping on this series.

There are a few review comments that I can address in a v2, but one
point seems to need maintainer guidance before I rework the series.

In particular, there was a discussion around whether dma-noncoherent
should remain an additive property handled separately from the ITS quirk
table, or whether it should be modelled as part of the quirk matching
machinery, which would likely require accumulating flags from all
matching entries rather than keeping the current first-match semantics.

Could maintainers please share their preference here? I am happy to
prepare a v2 once the expected direction is clear.

Thanks,
Mykola

On Wed, Mar 25, 2026 at 12:41 PM Mykola Kvach <xakep.amatop@xxxxxxxxx> wrote:
>
> From: Mykola Kvach <mykola_kvach@xxxxxxxx>
>
> This series cleans up ARM GICv3 ITS quirk handling and fixes the point at
> which quirk-derived memory attributes become visible to the LPI setup path.
>
> The first patch switches the quirk handling from per-entry init callbacks to
> declarative flags and folds in the DT dma-noncoherent property when deriving
> the effective ITS attributes.
>
> The second patch extends quirk matching with an optional platform callback so
> that boards sharing the same IIDR can still be distinguished reliably. This
> is then used by the third patch to add the Orange Pi 5 ITS quirk for
> RK3588/RK3588S boards.
>
> Finally, the last patch moves ITS quirk discovery and validation earlier in
> the boot flow, before host LPI tables are initialized, so the boot CPU does
> not allocate and program LPI data structures with default attributes when the
> platform requires different ones.
>
> Mykola Kvach (4):
>   xen/arm: its: collect quirk flags and honor dma-noncoherent
>   xen/arm: its: add platform match callback for ITS quirks
>   xen/arm: its: add Orange Pi 5 ITS quirk
>   xen/arm: its: pre-initialize ITS quirks before LPI setup
>
>  xen/arch/arm/gic-v3-its.c             | 129 +++++++++++++++++++-------
>  xen/arch/arm/gic-v3.c                 |   7 ++
>  xen/arch/arm/include/asm/gic_v3_its.h |   5 +
>  3 files changed, 107 insertions(+), 34 deletions(-)
>
> --
> 2.43.0
>