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| author |   Tom Lendacky <thomas.lendacky@amd.com> | 2021-09-08 17:58:32 -0500 |
|---|---|---|
| committer |   Borislav Petkov <bp@suse.de> | 2021-10-04 11:45:49 +0200 |
| commit | 402fe0cb71032c4bc931ac70a6b024408e09f817 (patch) | |
| tree | 2a6a8c837b6a47876cbc14c4882b207e409f2668 /arch/x86/include/asm/io.h | |
| parent | Linux 5.15-rc4 (diff) | |
| download | linux-dev-402fe0cb71032c4bc931ac70a6b024408e09f817.tar.xz linux-dev-402fe0cb71032c4bc931ac70a6b024408e09f817.zip | |
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@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210928191009.32551-2-bp@alien8.de
Diffstat (limited to 'arch/x86/include/asm/io.h')
| -rw-r--r-- | arch/x86/include/asm/io.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 841a5d104afa..5c6a4af0b911 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 |