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42be24a417
Use the memory encryption APIs to trigger a RSI call to request a transition between protected memory and shared memory (or vice versa) and updating the kernel's linear map of modified pages to flip the top bit of the IPA. This requires that block mappings are not used in the direct map for realm guests. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Co-developed-by: Steven Price <steven.price@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> Link: https://lore.kernel.org/r/20241017131434.40935-10-steven.price@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
21 lines
637 B
C
21 lines
637 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ASM_ARM64_SET_MEMORY_H
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#define _ASM_ARM64_SET_MEMORY_H
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#include <asm/mem_encrypt.h>
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#include <asm-generic/set_memory.h>
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bool can_set_direct_map(void);
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#define can_set_direct_map can_set_direct_map
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int set_memory_valid(unsigned long addr, int numpages, int enable);
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int set_direct_map_invalid_noflush(struct page *page);
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int set_direct_map_default_noflush(struct page *page);
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bool kernel_page_present(struct page *page);
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int set_memory_encrypted(unsigned long addr, int numpages);
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int set_memory_decrypted(unsigned long addr, int numpages);
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#endif /* _ASM_ARM64_SET_MEMORY_H */
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