Tom Lendacky 9087c37584 dma-direct: Force unencrypted DMA under SME for certain DMA masks ... If a device doesn't support DMA to a physical address that includes the encryption bit (currently bit 47, so 48-bit DMA), then the DMA must occur to unencrypted memory. SWIOTLB is used to satisfy that requirement if an IOMMU is not active (enabled or configured in passthrough mode). However, commit fafadcd165 ("swiotlb: don't dip into swiotlb pool for coherent allocations") modified the coherent allocation support in SWIOTLB to use the DMA direct coherent allocation support. When an IOMMU is not active, this resulted in dma_alloc_coherent() failing for devices that didn't support DMA addresses that included the encryption bit. Addressing this requires changes to the force_dma_unencrypted() function in kernel/dma/direct.c. Since the function is now non-trivial and SME/SEV specific, update the DMA direct support to add an arch override for the force_dma_unencrypted() function. The arch override is selected when CONFIG_AMD_MEM_ENCRYPT is set. The arch override function resides in the arch/x86/mm/mem_encrypt.c file and forces unencrypted DMA when either SEV is active or SME is active and the device does not support DMA to physical addresses that include the encryption bit. Fixes: fafadcd165 ("swiotlb: don't dip into swiotlb pool for coherent allocations") Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> [hch: moved the force_dma_unencrypted declaration to dma-mapping.h, fold the s390 fix from Halil Pasic] Signed-off-by: Christoph Hellwig <hch@lst.de>		2019-07-16 22:15:46 +02:00
..
appldata	sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD	2018-10-26 16:26:32 -07:00
boot	s390/boot: fix compiler error due to missing awk strtonum	2019-05-07 14:37:14 +02:00
configs	Kbuild updates for v5.3	2019-07-12 16:03:16 -07:00
crypto	s390/crypto: sha: Use -ENODEV instead of -EOPNOTSUPP	2019-06-15 12:24:48 +02:00
hypfs	s390/kernel: introduce .dma sections	2019-04-29 10:47:10 +02:00
include	s390 updates for the 5.3 merge window #2	2019-07-12 15:39:22 -07:00
kernel	s390 updates for the 5.3 merge window #2	2019-07-12 15:39:22 -07:00
kvm	ARM:	2019-07-12 15:35:14 -07:00
lib	s390: enforce CONFIG_SMP	2019-06-07 10:09:37 +02:00
mm	dma-direct: Force unencrypted DMA under SME for certain DMA masks	2019-07-16 22:15:46 +02:00
net	s390: bpf: eliminate zero extension code-gen	2019-05-24 18:58:38 -07:00
numa	treewide: add checks for the return value of memblock_alloc*()	2019-03-12 10:04:02 -07:00
oprofile	s390/unwind: introduce stack unwind API	2019-05-02 13:54:11 +02:00
pci	s390 updates for the 5.3 merge window #2	2019-07-12 15:39:22 -07:00
purgatory	s390/purgatory: update .gitignore	2019-06-04 15:03:42 +02:00
scripts	s390: make chkbss work with clang	2019-04-11 13:36:52 +02:00
tools	s390/disassembler: update opcode table	2019-06-04 15:03:58 +02:00
Kbuild	s390/kexec_file: Add purgatory	2018-04-16 09:10:22 +02:00
Kconfig	dma-direct: Force unencrypted DMA under SME for certain DMA masks	2019-07-16 22:15:46 +02:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	Kconfig updates for v5.3	2019-07-12 16:06:27 -07:00