diff options
Diffstat (limited to 'arch/arm64/include/asm/mem_encrypt.h')
| -rw-r--r-- | arch/arm64/include/asm/mem_encrypt.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mem_encrypt.h b/arch/arm64/include/asm/mem_encrypt.h index f8f78f622dd2..314b2b52025f 100644 --- a/arch/arm64/include/asm/mem_encrypt.h +++ b/arch/arm64/include/asm/mem_encrypt.h @@ -4,6 +4,8 @@ #include <asm/rsi.h> +struct device; + struct arm64_mem_crypt_ops { int (*encrypt)(unsigned long addr, int numpages); int (*decrypt)(unsigned long addr, int numpages); @@ -21,4 +23,15 @@ static inline bool force_dma_unencrypted(struct device *dev) return is_realm_world(); } +/* + * For Arm CCA guests, canonical addresses are "encrypted", so no changes + * required for dma_addr_encrypted(). + * The unencrypted DMA buffers must be accessed via the unprotected IPA, + * "top IPA bit" set. + */ +#define dma_addr_unencrypted(x) ((x) | PROT_NS_SHARED) + +/* Clear the "top" IPA bit while converting back */ +#define dma_addr_canonical(x) ((x) & ~PROT_NS_SHARED) + #endif /* __ASM_MEM_ENCRYPT_H */ |