[patch for-5.8 0/4] dma-direct: dma_direct_alloc_pages() fixes for AMD SEV

[David Rientjes]

While debugging recently reported issues concerning DMA allocation
practices when CONFIG_AMD_MEM_ENCRYPT is enabled, some curiosities arose
when looking at dma_direct_alloc_pages() behavior.

Fix these up.  These are likely all stable material, so proposing for 5.8.
---
 kernel/dma/direct.c | 42 ++++++++++++++++++++++++++++++++----------
 1 file changed, 32 insertions(+), 10 deletions(-)