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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_MEM_ENCRYPT_H
#define __ASM_MEM_ENCRYPT_H
#include <linux/arm-rsi-cmds.h>
#include <asm/hypervisor.h>
struct device;
struct arm64_mem_crypt_ops {
int (*encrypt)(unsigned long addr, int numpages);
int (*decrypt)(unsigned long addr, int numpages);
};
int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops);
int set_memory_encrypted(unsigned long addr, int numpages);
int set_memory_decrypted(unsigned long addr, int numpages);
int __set_memory_enc_dec(unsigned long addr, int numpages, bool encrypt);
static inline bool force_dma_unencrypted(struct device *dev)
{
return is_realm_world() || is_protected_kvm_guest();
}
/*
* 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 */
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