Re: [PATCH v3 2/2] iommu/arm-smmu-v3: Add HAFT support for SVA
Jason Gunthorpe <[email protected]> Tue, 28 Jul 2026 20:14:02 -0300
| Newsgroups | dev.linux.lists.iommu,org.infradead.lists.linux-arm-kernel |
|---|---|
| Message-ID | <[email protected]> |
On Mon, Jul 27, 2026 at 01:03:29PM +0100, Robin Murphy wrote: > Since table access flags cannot be software-managed, if process > pagetables are using HAFT then SVA must require the SMMU to support and > enable it too, otherwise page aging is liable to get out of whack. > > For unbinding, we can't disable HAFT atomically with HA as might be > desired, but luckily we can get away with just not disabling HA either. > > Cc: <[email protected]> > Fixes: 62df5870ebf7 ("arm64: Enable ARCH_HAS_NONLEAF_PMD_YOUNG") > Signed-off-by: Robin Murphy <[email protected]> > --- > > v3: Make all HTTU settings unconditional WRT mm. Reviewed-by: Jason Gunthorpe <[email protected]> Jason