Re: [PATCH v7 00/24] iommu: Shared Virtual Addressing for SMMUv3

Will Deacon
2020-05-21T10:35:26Z

Hi Jean-Philippe,

On Tue, May 19, 2020 at 07:54:38PM +0200, Jean-Philippe Brucker wrote:
> Shared Virtual Addressing (SVA) allows to share process page tables with
> devices using the IOMMU, PASIDs and I/O page faults. Add SVA support to
> the Arm SMMUv3 driver.
>
> Since v6 [1]:
> * Rename ioasid_free() to ioasid_put() in patch 02, requiring changes to
> the Intel drivers.
> * Use mmu_notifier_register() in patch 16 to avoid copying the ops and
> simplify the invalidate() notifier in patch 17.
> * As a result, replace context spinlock with a mutex. Simplified locking in
> patch 11 (That patch still looks awful, but I think the series is more
> readable overall). And I've finally been able to remove the GFP_ATOMIC
> allocations.
> * Use a single patch (04) for io-pgfault.c, since the code was simplified
> in v6. Fixed partial list in patch 04.

There's an awful lot here and it stretches across quite a few subsystems,
with different git trees. What's the plan for merging it?

I'm happy to take some of the arm64 and smmu changes for 5.8, then perhaps
we can review what's left and target 5.9? It would also be helpful to split
that up into separate series where there aren't strong dependencies, I
think.

Will