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| author | Ard Biesheuvel <ardb@kernel.org> | 2024-02-14 13:28:54 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2024-02-16 12:42:30 +0000 |
| commit | dcfe969a641984fcd2b52aa257e478443612c050 (patch) | |
| tree | 1e3dc78dccfd1eec67302fd5f0780a245a8943e3 /arch/arm64/kernel/head.S | |
| parent | 30687dec5ed5576c743a4cd012a91f93848fe902 (diff) | |
| download | lwn-dcfe969a641984fcd2b52aa257e478443612c050.tar.gz lwn-dcfe969a641984fcd2b52aa257e478443612c050.zip | |
arm64: head: Run feature override detection before mapping the kernel
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>
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 2af518161f3a..865ecc1f8255 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -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 |