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| author | Ard Biesheuvel <ardb@kernel.org> | 2024-06-20 10:10:49 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2024-07-02 01:26:24 +0300 |
| commit | 37aee82c213d352dccb850dc4228dda2e7e591b1 (patch) | |
| tree | 9d85222c219bb5ccd4ae1e0070de9514e6f7f339 /arch/x86/include/asm/efi.h | |
| parent | f2661062f16b2de5d7b6a5c42a9a5c96326b8454 (diff) | |
| download | linux-37aee82c213d352dccb850dc4228dda2e7e591b1.tar.xz | |
x86/efi: Drop support for fake EFI memory maps
Between kexec and confidential VM support, handling the EFI memory maps
correctly on x86 is already proving to be rather difficult (as opposed
to other EFI architectures which manage to never modify the EFI memory
map to begin with)
EFI fake memory map support is essentially a development hack (for
testing new support for the 'special purpose' and 'more reliable' EFI
memory attributes) that leaked into production code. The regions marked
in this manner are not actually recognized as such by the firmware
itself or the EFI stub (and never have), and marking memory as 'more
reliable' seems rather futile if the underlying memory is just ordinary
RAM.
Marking memory as 'special purpose' in this way is also dubious, but may
be in use in production code nonetheless. However, the same should be
achievable by using the memmap= command line option with the ! operator.
EFI fake memmap support is not enabled by any of the major distros
(Debian, Fedora, SUSE, Ubuntu) and does not exist on other
architectures, so let's drop support for it.
Acked-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/efi.h')
| -rw-r--r-- | arch/x86/include/asm/efi.h | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h index 481096177500..b3e4d999b913 100644 --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -384,23 +384,8 @@ static inline void efi_reserve_boot_services(void) } #endif /* CONFIG_EFI */ -#ifdef CONFIG_EFI_FAKE_MEMMAP -extern void __init efi_fake_memmap_early(void); -extern void __init efi_fake_memmap(void); -#else -static inline void efi_fake_memmap_early(void) -{ -} - -static inline void efi_fake_memmap(void) -{ -} -#endif - extern int __init efi_memmap_alloc(unsigned int num_entries, struct efi_memory_map_data *data); -extern void __efi_memmap_free(u64 phys, unsigned long size, - unsigned long flags); extern int __init efi_memmap_install(struct efi_memory_map_data *data); extern int __init efi_memmap_split_count(efi_memory_desc_t *md, |