On Wed, May 11, 2022 at 05:08:52PM +0300, Mike Rapoport wrote: > I guess the default to use memblock_alloc_low() backfires on system with > physical memory living at 0x1000200000: > > [ 0.000000] Early memory node ranges > [ 0.000000] node 0: [mem 0x0000001000200000-0x000000103fffffff] > > The default limit for "low" memory is 0xffffffff and there is simply no > memory there. Is there any way to ask memblock for a specific address limit? swiotlb just wants <= 32-bit by default. With the little caveat that it should be 32-bit addressable for all devices, and we don't know the physical to dma address mapping at time of allocation.
