On 12/7/18 7:16 AM, Nicolas Boichat wrote:
> IOMMUs using ARMv7 short-descriptor format require page tables
> to be allocated within the first 4GB of RAM, even on 64-bit systems.
> On arm64, this is done by passing GFP_DMA32 flag to memory allocation
> functions.
>
> For IOMMU L2 tables that only
IOMMUs using ARMv7 short-descriptor format require page tables
to be allocated within the first 4GB of RAM, even on 64-bit systems.
On arm64, this is done by passing GFP_DMA32 flag to memory allocation
functions.
For IOMMU L2 tables that only take 1KB, it would be a waste to allocate
a full page
