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arm64: head: Run feature override detection before mapping the kernel

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To permit the feature overrides to be taken into account before the
KASLR init code runs and the kernel mapping is created, move the
detection code to an earlier stage in the boot.

In a subsequent patch, this will be taken advantage of by merging the
preliminary and permanent mappings of the kernel text and data into a
single one that gets created and relocated before start_kernel() is
called.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-53-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel 2024-02-14 13:28:54 +01:00 committed by Catalin Marinas
parent 30687dec5e
commit dcfe969a64
2 changed files with 10 additions and 11 deletions
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17
arch/arm64/kernel/head.S
View file

@ -375,9 +375,9 @@ SYM_FUNC_START_LOCAL(create_idmap)
map_memory x0, x1, x3, x6, x7, x3, IDMAP_PGD_ORDER, x10, x11, x12, x13, x14, EXTRA_SHIFT
/* Remap BSS and the kernel page tables r/w in the ID map */
/* Remap [.init].data, BSS and the kernel page tables r/w in the ID map */
adrp x1, _text
adrp x2, __bss_start
adrp x2, __initdata_begin
adrp x3, _end
bic x4, x2, #SWAPPER_BLOCK_SIZE - 1
mov_q x5, SWAPPER_RW_MMUFLAGS
@ -491,9 +491,6 @@ SYM_FUNC_START_LOCAL(__primary_switched)
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
bl kasan_early_init
#endif
mov x0, x20 // pass the full boot status
mov x1, x22 // pass the low FDT mapping
bl __pi_init_feature_override // Parse cpu feature overrides
#ifdef CONFIG_UNWIND_PATCH_PAC_INTO_SCS
bl scs_patch_vmlinux
#endif
@ -772,12 +769,16 @@ SYM_FUNC_START_LOCAL(__primary_switch)
bl __pi_memset
dsb ishst // Make zero page visible to PTW
#ifdef CONFIG_RELOCATABLE
adrp x23, KERNEL_START
and x23, x23, MIN_KIMG_ALIGN - 1
adrp x1, early_init_stack
mov sp, x1
mov x29, xzr
mov x0, x20 // pass the full boot status
mov x1, x22 // pass the low FDT mapping
bl __pi_init_feature_override // Parse cpu feature overrides
#ifdef CONFIG_RELOCATABLE
adrp x23, KERNEL_START
and x23, x23, MIN_KIMG_ALIGN - 1
#ifdef CONFIG_RANDOMIZE_BASE
mov x0, x22
bl __pi_kaslr_early_init

4
arch/arm64/kernel/vmlinux.lds.S
View file

@ -320,10 +320,8 @@ SECTIONS
init_pg_end = .;
/* end of zero-init region */
#ifdef CONFIG_RELOCATABLE
. += SZ_4K; /* stack for the early relocation code */
. += SZ_4K; /* stack for the early C runtime */
early_init_stack = .;
#endif
. = ALIGN(SEGMENT_ALIGN);
__pecoff_data_size = ABSOLUTE(. - __initdata_begin);