On Mon, Apr 28, 2025 at 03:35:16PM +0000, Mikołaj Lenczewski wrote: > For supporting BBM Level 2 for userspace mappings, we want to ensure > that the smmu also supports its own version of BBM Level 2. Luckily, the > smmu spec (IHI 0070G 3.21.1.3) is stricter than the aarch64 spec (DDI > 0487K.a D8.16.2), so already guarantees that no aborts are raised when > BBM level 2 is claimed. > > Add the feature and testing for it under arm_smmu_sva_supported(). > > Signed-off-by: Mikołaj Lenczewski <miko.lenczewski@xxxxxxx> > Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx> > Reviewed-by: Ryan Roberts <ryan.roberts@xxxxxxx> > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 3 +++ > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 +++ > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 4 ++++ > 3 files changed, 10 insertions(+) This looks fine to me but please note that it doesn't apply against mainline (v6.15-rc5). Will
