The following commit has been merged into the x86/cc branch of tip: Commit-ID: 402fe0cb71032c4bc931ac70a6b024408e09f817 Gitweb: https://git.kernel.org/tip/402fe0cb71032c4bc931ac70a6b024408e09f817 Author: Tom Lendacky <thomas.lendacky@xxxxxxx> AuthorDate: Wed, 08 Sep 2021 17:58:32 -05:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 04 Oct 2021 11:45:49 +02:00 x86/ioremap: Selectively build arch override encryption functions In preparation for other uses of the cc_platform_has() function besides AMD's memory encryption support, selectively build the AMD memory encryption architecture override functions only when CONFIG_AMD_MEM_ENCRYPT=y. These functions are: - early_memremap_pgprot_adjust() - arch_memremap_can_ram_remap() Additionally, routines that are only invoked by these architecture override functions can also be conditionally built. These functions are: - memremap_should_map_decrypted() - memremap_is_efi_data() - memremap_is_setup_data() - early_memremap_is_setup_data() And finally, phys_mem_access_encrypted() is conditionally built as well, but requires a static inline version of it when CONFIG_AMD_MEM_ENCRYPT is not set. Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Link: https://lkml.kernel.org/r/20210928191009.32551-2-bp@xxxxxxxxx --- arch/x86/include/asm/io.h | 8 ++++++++ arch/x86/mm/ioremap.c | 2 +- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 841a5d1..5c6a4af 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -391,6 +391,7 @@ extern void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size) #define arch_io_reserve_memtype_wc arch_io_reserve_memtype_wc #endif +#ifdef CONFIG_AMD_MEM_ENCRYPT extern bool arch_memremap_can_ram_remap(resource_size_t offset, unsigned long size, unsigned long flags); @@ -398,6 +399,13 @@ extern bool arch_memremap_can_ram_remap(resource_size_t offset, extern bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size); +#else +static inline bool phys_mem_access_encrypted(unsigned long phys_addr, + unsigned long size) +{ + return true; +} +#endif /** * iosubmit_cmds512 - copy data to single MMIO location, in 512-bit units diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 60ade7d..ccff76c 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -508,6 +508,7 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr) memunmap((void *)((unsigned long)addr & PAGE_MASK)); } +#ifdef CONFIG_AMD_MEM_ENCRYPT /* * Examine the physical address to determine if it is an area of memory * that should be mapped decrypted. If the memory is not part of the @@ -746,7 +747,6 @@ bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size) return arch_memremap_can_ram_remap(phys_addr, size, 0); } -#ifdef CONFIG_AMD_MEM_ENCRYPT /* Remap memory with encryption */ void __init *early_memremap_encrypted(resource_size_t phys_addr, unsigned long size)
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