diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dma-mapping.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 677c51ab7510..db8ab24a54f4 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -92,6 +92,16 @@ * flushing. */ #define DMA_ATTR_REQUIRE_COHERENT (1UL << 12) +/* + * DMA_ATTR_CC_SHARED: Indicates the DMA mapping is shared (decrypted) for + * confidential computing guests. For normal system memory the caller must have + * called set_memory_decrypted(), and pgprot_decrypted must be used when + * creating CPU PTEs for the mapping. The same shared semantic may be passed + * to the vIOMMU when it sets up the IOPTE. For MMIO use together with + * DMA_ATTR_MMIO to indicate shared MMIO. Unless DMA_ATTR_MMIO is provided + * a struct page is required. + */ +#define DMA_ATTR_CC_SHARED (1UL << 13) /* * A dma_addr_t can hold any valid DMA or bus address for the platform. It can |