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arm64/efi: mark UEFI reserved regions as MEMBLOCK_NOMAP

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Change the EFI memory reservation logic to use memblock_mark_nomap()
rather than memblock_reserve() to mark UEFI reserved regions as
occupied. In addition to reserving them against allocations done by
memblock, this will also prevent them from being covered by the linear
mapping.

Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel 2015-11-30 13:28:17 +01:00 • committed by Will Deacon
parent 68709f4538
commit 4dffbfc48d
1 changed files with 4 additions and 3 deletions
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7
arch/arm64/kernel/efi.c
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@ -187,7 +187,7 @@ static __init void reserve_regions(void)
early_init_dt_add_memory_arch(paddr, size); early_init_dt_add_memory_arch(paddr, size);
if (is_reserve_region(md)) { if (is_reserve_region(md)) {
memblock_reserve(paddr, size); memblock_mark_nomap(paddr, size);
if (efi_enabled(EFI_DBG)) if (efi_enabled(EFI_DBG))
pr_cont("*"); pr_cont("*");
} }
@ -209,8 +209,6 @@ void __init efi_init(void)
efi_system_table = params.system_table; efi_system_table = params.system_table;
memblock_reserve(params.mmap & PAGE_MASK,
PAGE_ALIGN(params.mmap_size + (params.mmap & ~PAGE_MASK)));
memmap.phys_map = params.mmap; memmap.phys_map = params.mmap;
memmap.map = early_memremap(params.mmap, params.mmap_size); memmap.map = early_memremap(params.mmap, params.mmap_size);
if (memmap.map == NULL) { if (memmap.map == NULL) {
@ -230,6 +228,9 @@ void __init efi_init(void)
reserve_regions(); reserve_regions();
early_memunmap(memmap.map, params.mmap_size); early_memunmap(memmap.map, params.mmap_size);
memblock_mark_nomap(params.mmap & PAGE_MASK,
PAGE_ALIGN(params.mmap_size +
(params.mmap & ~PAGE_MASK)));
} }
static bool __init efi_virtmap_init(void) static bool __init efi_virtmap_init(void)