On Fri, Oct 09, 2020 at 06:10:52PM +0100, Catalin Marinas wrote: > kdump wants DMA-able memory and, DMAable by whom? The only way to guranteed DMAable memory is to use the DMA memory allocator(s) and pass a specific device to them. Everyting else is just fundamentally broken. Note that even when device is not DMAable we can still use swiotlb to access it.
