129 lines
4.5 KiB
Diff
129 lines
4.5 KiB
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Fri, 1 Dec 2017 10:42:03 +0100
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Subject: [PATCH] arm*: disable NEON in kernel mode
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patches-4.14.6-rt7.tar.xz
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NEON in kernel mode is used by the crypto algorithms and raid6 code.
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While the raid6 code looks okay, the crypto algorithms do not: NEON
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is enabled on first invocation and may allocate/free/map memory before
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the NEON mode is disabled again.
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This needs to be changed until it can be enabled.
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On ARM NEON in kernel mode can be simply disabled. on ARM64 it needs to
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stay on due to possible EFI callbacks so here I disable each algorithm.
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Cc: stable-rt@vger.kernel.org
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/arm/Kconfig | 2 +-
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arch/arm64/crypto/Kconfig | 20 ++++++++++----------
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arch/arm64/crypto/crc32-ce-glue.c | 3 ++-
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3 files changed, 13 insertions(+), 12 deletions(-)
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--- a/arch/arm/Kconfig
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+++ b/arch/arm/Kconfig
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@@ -2164,7 +2164,7 @@ config NEON
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config KERNEL_MODE_NEON
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bool "Support for NEON in kernel mode"
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- depends on NEON && AEABI
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+ depends on NEON && AEABI && !PREEMPT_RT_BASE
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help
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Say Y to include support for NEON in kernel mode.
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--- a/arch/arm64/crypto/Kconfig
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+++ b/arch/arm64/crypto/Kconfig
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@@ -19,19 +19,19 @@ config CRYPTO_SHA512_ARM64
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config CRYPTO_SHA1_ARM64_CE
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tristate "SHA-1 digest algorithm (ARMv8 Crypto Extensions)"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_HASH
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select CRYPTO_SHA1
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config CRYPTO_SHA2_ARM64_CE
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tristate "SHA-224/SHA-256 digest algorithm (ARMv8 Crypto Extensions)"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_HASH
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select CRYPTO_SHA256_ARM64
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config CRYPTO_GHASH_ARM64_CE
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tristate "GHASH/AES-GCM using ARMv8 Crypto Extensions"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_HASH
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select CRYPTO_GF128MUL
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select CRYPTO_AES
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@@ -39,7 +39,7 @@ config CRYPTO_GHASH_ARM64_CE
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config CRYPTO_CRCT10DIF_ARM64_CE
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tristate "CRCT10DIF digest algorithm using PMULL instructions"
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- depends on KERNEL_MODE_NEON && CRC_T10DIF
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+ depends on KERNEL_MODE_NEON && CRC_T10DIF && !PREEMPT_RT_BASE
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select CRYPTO_HASH
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config CRYPTO_CRC32_ARM64_CE
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@@ -53,13 +53,13 @@ config CRYPTO_AES_ARM64
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config CRYPTO_AES_ARM64_CE
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tristate "AES core cipher using ARMv8 Crypto Extensions"
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- depends on ARM64 && KERNEL_MODE_NEON
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+ depends on ARM64 && KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_ALGAPI
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select CRYPTO_AES_ARM64
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config CRYPTO_AES_ARM64_CE_CCM
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tristate "AES in CCM mode using ARMv8 Crypto Extensions"
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- depends on ARM64 && KERNEL_MODE_NEON
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+ depends on ARM64 && KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_ALGAPI
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select CRYPTO_AES_ARM64_CE
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select CRYPTO_AES_ARM64
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@@ -67,7 +67,7 @@ config CRYPTO_AES_ARM64_CE_CCM
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config CRYPTO_AES_ARM64_CE_BLK
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tristate "AES in ECB/CBC/CTR/XTS modes using ARMv8 Crypto Extensions"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_BLKCIPHER
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select CRYPTO_AES_ARM64_CE
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select CRYPTO_AES_ARM64
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@@ -75,7 +75,7 @@ config CRYPTO_AES_ARM64_CE_BLK
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config CRYPTO_AES_ARM64_NEON_BLK
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tristate "AES in ECB/CBC/CTR/XTS modes using NEON instructions"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_BLKCIPHER
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select CRYPTO_AES_ARM64
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select CRYPTO_AES
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@@ -83,13 +83,13 @@ config CRYPTO_AES_ARM64_NEON_BLK
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config CRYPTO_CHACHA20_NEON
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tristate "NEON accelerated ChaCha20 symmetric cipher"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_BLKCIPHER
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select CRYPTO_CHACHA20
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config CRYPTO_AES_ARM64_BS
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tristate "AES in ECB/CBC/CTR/XTS modes using bit-sliced NEON algorithm"
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- depends on KERNEL_MODE_NEON
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+ depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
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select CRYPTO_BLKCIPHER
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select CRYPTO_AES_ARM64_NEON_BLK
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select CRYPTO_AES_ARM64
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--- a/arch/arm64/crypto/crc32-ce-glue.c
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+++ b/arch/arm64/crypto/crc32-ce-glue.c
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@@ -206,7 +206,8 @@ static struct shash_alg crc32_pmull_algs
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static int __init crc32_pmull_mod_init(void)
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{
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- if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && (elf_hwcap & HWCAP_PMULL)) {
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+ if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
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+ !IS_ENABLED(CONFIG_PREEMPT_RT_BASE) && (elf_hwcap & HWCAP_PMULL)) {
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crc32_pmull_algs[0].update = crc32_pmull_update;
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crc32_pmull_algs[1].update = crc32c_pmull_update;
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