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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: Ard Biesheuvel <ardb@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Brown <broonie@kernel.org>,
	Anshuman Khandual <anshuman.khandual@arm.com>
Subject: [PATCH v7 20/33] arm64: Move feature overrides into the BSS section
Date: Fri, 11 Nov 2022 18:11:48 +0100	[thread overview]
Message-ID: <20221111171201.2088501-21-ardb@kernel.org> (raw)
In-Reply-To: <20221111171201.2088501-1-ardb@kernel.org>

In order to allow the CPU feature override detection code to run even
earlier, move the feature override global variables into BSS, which is
the only part of the static kernel image that is mapped read-write in
the initial ID map.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/kernel/cpufeature.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index ebd8cabffb105e15..08ab04dc9393652a 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -636,13 +636,13 @@ static const struct arm64_ftr_bits ftr_raz[] = {
 #define ARM64_FTR_REG(id, table)		\
 	__ARM64_FTR_REG_OVERRIDE(#id, id, table, &no_override)
 
-struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override;
-struct arm64_ftr_override __ro_after_init id_aa64pfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64pfr1_override;
-struct arm64_ftr_override __ro_after_init id_aa64zfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64smfr0_override;
-struct arm64_ftr_override __ro_after_init id_aa64isar1_override;
-struct arm64_ftr_override __ro_after_init id_aa64isar2_override;
+struct arm64_ftr_override id_aa64mmfr1_override;
+struct arm64_ftr_override id_aa64pfr0_override;
+struct arm64_ftr_override id_aa64pfr1_override;
+struct arm64_ftr_override id_aa64zfr0_override;
+struct arm64_ftr_override id_aa64smfr0_override;
+struct arm64_ftr_override id_aa64isar1_override;
+struct arm64_ftr_override id_aa64isar2_override;
 
 struct arm64_ftr_override arm64_sw_feature_override;
 
-- 
2.35.1


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  parent reply	other threads:[~2022-11-11 17:27 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-11 17:11 [PATCH v7 00/33] arm64: robustify boot sequence and add support for WXN Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 01/33] arm64: mm: Avoid SWAPPER_BLOCK_xxx constants in FDT fixmap logic Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 02/33] arm64: mm: Avoid swapper block size when choosing vmemmap granularity Ard Biesheuvel
2022-11-24  5:11   ` Anshuman Khandual
2022-11-11 17:11 ` [PATCH v7 03/33] arm64: kaslr: don't pretend KASLR is enabled if offset < MIN_KIMG_ALIGN Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 04/33] arm64: kaslr: drop special case for ThunderX in kaslr_requires_kpti() Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 05/33] arm64: kernel: Disable latent_entropy GCC plugin in early C runtime Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 06/33] arm64: kernel: Add relocation check to code built under pi/ Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 07/33] arm64: kernel: Don't rely on objcopy to make code under pi/ __init Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 08/33] arm64: head: move relocation handling to C code Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 09/33] arm64: Turn kaslr_feature_override into a generic SW feature override Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 10/33] arm64: idreg-override: Omit non-NULL checks for override pointer Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 11/33] arm64: idreg-override: Use relative references to override variables Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 12/33] arm64: idreg-override: Use relative references to filter routines Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 13/33] arm64: idreg-override: Avoid parameq() and parameqn() Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 14/33] arm64: idreg-override: avoid strlen() to check for empty strings Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 15/33] arm64: idreg-override: Avoid sprintf() for simple string concatenation Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 16/33] arm64: idreg_override: Avoid kstrtou64() to parse a single hex digit Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 17/33] arm64: idreg-override: Move to early mini C runtime Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 18/33] arm64: kernel: Remove early fdt remap code Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 19/33] arm64: head: Clear BSS and the kernel page tables in one go Ard Biesheuvel
2022-11-11 17:11 ` Ard Biesheuvel [this message]
2022-11-11 17:11 ` [PATCH v7 21/33] arm64: head: Run feature override detection before mapping the kernel Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 22/33] arm64: head: move dynamic shadow call stack patching into early C runtime Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 23/33] arm64: kaslr: Use feature override instead of parsing the cmdline again Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 24/33] arm64: idreg-override: Create a pseudo feature for rodata=off Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 25/33] arm64: head: allocate more pages for the kernel mapping Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 26/33] arm64: head: move memstart_offset_seed handling to C code Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 27/33] arm64: head: Move early kernel mapping routines into " Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 28/33] arm64: mm: avoid fixmap for early swapper_pg_dir updates Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 29/33] arm64: mm: omit redundant remap of kernel image Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 30/33] arm64: Revert "mm: provide idmap pointer to cpu_replace_ttbr1()" Ard Biesheuvel
2022-11-11 17:11 ` [PATCH v7 31/33] arm64: mmu: Retire SWAPPER_BLOCK_xxx and related constants Ard Biesheuvel
2022-11-11 17:12 ` [PATCH v7 32/33] mm: add arch hook to validate mmap() prot flags Ard Biesheuvel
2022-11-11 17:12 ` [PATCH v7 33/33] arm64: mm: add support for WXN memory translation attribute Ard Biesheuvel

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