[PATCH 1/5] iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains

On Thu, Jan 26, 2017 at 06:03:30PM +0100, Joerg Roedel wrote:

On Thu, Jan 19, 2017 at 06:19:11PM +0000, Will Deacon wrote:

quoted

The ARM SMMU drivers provide a DOMAIN_ATTR_NESTING domain attribute,
which allows callers of the IOMMU API to request that the page table
for a domain is installed at stage-2, if supported by the hardware.

Since setting this attribute only makes sense for UNMANAGED domains,
this patch returns -ENODEV if the domain_{get,set}_attr operations are
called on other domain types.

Isn't -EINVAL more suitable here? In the end the domain passed in is
invalid because it does not support attributes, no?

Sure, I can change that.

Will