| Message ID | 20240203-arm64-gcs-v8-15-c9fec77673ef@kernel.org |
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From: Mark Brown <broonie@kernel.org>
Date: Sat, 03 Feb 2024 12:25:41 +0000
Subject: [PATCH v8 15/38] arm64/idreg: Add overrride for GCS
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| Series |
arm64/gcs: Provide support for GCS in userspace
|
|
Commit Message
Mark Brown
Feb. 3, 2024, 12:25 p.m. UTC
Hook up an override for GCS, allowing it to be disabled from the command
line by specifying arm64.nogcs in case there are problems.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
arch/arm64/kernel/idreg-override.c | 2 ++
2 files changed, 8 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 31b3a25680d0..e86160251d23 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -429,9 +429,15 @@ arm64.nobti [ARM64] Unconditionally disable Branch Target Identification support + arm64.nogcs [ARM64] Unconditionally disable Guarded Control Stack + support + arm64.nomops [ARM64] Unconditionally disable Memory Copy and Memory Set instructions support + arm64.nopauth [ARM64] Unconditionally disable Pointer Authentication + support + arm64.nomte [ARM64] Unconditionally disable Memory Tagging Extension support diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index e30fd9e32ef3..00bcdad53ba9 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -110,6 +110,7 @@ static const struct ftr_set_desc pfr1 __prel64_initconst = { .override = &id_aa64pfr1_override, .fields = { FIELD("bt", ID_AA64PFR1_EL1_BT_SHIFT, NULL ), + FIELD("gcs", ID_AA64PFR1_EL1_GCS_SHIFT, NULL), FIELD("mte", ID_AA64PFR1_EL1_MTE_SHIFT, NULL), FIELD("sme", ID_AA64PFR1_EL1_SME_SHIFT, pfr1_sme_filter), {} @@ -190,6 +191,7 @@ static const struct { { "arm64.nosve", "id_aa64pfr0.sve=0" }, { "arm64.nosme", "id_aa64pfr1.sme=0" }, { "arm64.nobti", "id_aa64pfr1.bt=0" }, + { "arm64.nogcs", "id_aa64pfr1.gcs=0" }, { "arm64.nopauth", "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 " "id_aa64isar1.api=0 id_aa64isar1.apa=0 "