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34 lines
1.4 KiB
Diff
34 lines
1.4 KiB
Diff
From ff02f77788f8c01e9d675912c063e89415804b7d Mon Sep 17 00:00:00 2001
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From: Andre Przywara <andre.przywara@arm.com>
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Date: Fri, 17 May 2019 17:39:27 +0100
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Subject: [PATCH] arm64: kpti: Whitelist early Arm Neoverse N1 revisions
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Early revisions (r1p0) of the Neoverse N1 core did not feature the
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CSV3 field in ID_AA64PFR0_EL1 to advertise they are not affected by
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the Spectre variant 3 (aka Meltdown) vulnerability.
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Add this particular revision to the whitelist to avoid enabling KPTI.
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Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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Change-Id: I78df055a3e674aefd195d41cc6dc4ee08b0af099
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Upstream-Status: Inappropriate
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Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
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Signed-off-by: Adam Johnston <adam.johnston@arm.com>
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---
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arch/arm64/kernel/cpufeature.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
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index b3f37e2209ad..b74210f38cd8 100644
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--- a/arch/arm64/kernel/cpufeature.c
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+++ b/arch/arm64/kernel/cpufeature.c
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@@ -1646,6 +1646,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry,
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MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER),
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MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER),
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MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER),
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+ MIDR_REV(MIDR_NEOVERSE_N1, 1, 0), /* missing CSV3 */
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{ /* sentinel */ }
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};
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char const *str = "kpti command line option";
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