diff options
Diffstat (limited to 'meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-yocto-6.5/n1sdp/0005-arm64-kpti-Whitelist-early-Arm-Neoverse-N1-revisions.patch')
-rw-r--r-- | meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-yocto-6.5/n1sdp/0005-arm64-kpti-Whitelist-early-Arm-Neoverse-N1-revisions.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-yocto-6.5/n1sdp/0005-arm64-kpti-Whitelist-early-Arm-Neoverse-N1-revisions.patch b/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-yocto-6.5/n1sdp/0005-arm64-kpti-Whitelist-early-Arm-Neoverse-N1-revisions.patch new file mode 100644 index 0000000000..42ef0ee38a --- /dev/null +++ b/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-yocto-6.5/n1sdp/0005-arm64-kpti-Whitelist-early-Arm-Neoverse-N1-revisions.patch @@ -0,0 +1,33 @@ +From a9df434f077e7f1d8895e76381ba7179f3ebb1ba Mon Sep 17 00:00:00 2001 +From: Andre Przywara <andre.przywara@arm.com> +Date: Fri, 17 May 2019 17:39:27 +0100 +Subject: [PATCH] arm64: kpti: Whitelist early Arm Neoverse N1 revisions + +Early revisions (r1p0) of the Neoverse N1 core did not feature the +CSV3 field in ID_AA64PFR0_EL1 to advertise they are not affected by +the Spectre variant 3 (aka Meltdown) vulnerability. + +Add this particular revision to the whitelist to avoid enabling KPTI. + +Signed-off-by: Andre Przywara <andre.przywara@arm.com> +Change-Id: I78df055a3e674aefd195d41cc6dc4ee08b0af099 +Upstream-Status: Inappropriate +Signed-off-by: Andre Przywara <andre.przywara@arm.com> +Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com> +Signed-off-by: Adam Johnston <adam.johnston@arm.com> +--- + arch/arm64/kernel/cpufeature.c | 1 + + 1 file changed, 1 insertion(+) + +diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c +index 2c0b8444fea6..5c0ff40c6c8b 100644 +--- a/arch/arm64/kernel/cpufeature.c ++++ b/arch/arm64/kernel/cpufeature.c +@@ -1690,6 +1690,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), ++ MIDR_REV(MIDR_NEOVERSE_N1, 1, 0), /* missing CSV3 */ + { /* sentinel */ } + }; + char const *str = "kpti command line option"; |