diff mbox series

[v7,19/50] arm64: idreg-override: Create a pseudo feature for rodata=off

Message ID 20240123145258.1462979-71-ardb+git@google.com (mailing list archive)
State New, archived
Headers show
Series arm64: Add support for LPA2 and WXN at stage 1 | expand

Commit Message

Ard Biesheuvel Jan. 23, 2024, 2:53 p.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

Add rodata=off to the set of kernel command line options that is parsed
early using the CPU feature override detection code, so we can easily
refer to it when creating the kernel mapping.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/include/asm/cpufeature.h   | 1 +
 arch/arm64/kernel/pi/idreg-override.c | 2 ++
 2 files changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index e309255b7f04..03c34242bfc7 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -17,6 +17,7 @@ 
 
 #define ARM64_SW_FEATURE_OVERRIDE_NOKASLR	0
 #define ARM64_SW_FEATURE_OVERRIDE_HVHE		4
+#define ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF	8
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/arm64/kernel/pi/idreg-override.c b/arch/arm64/kernel/pi/idreg-override.c
index f9e05c10faab..e4bcabcc6860 100644
--- a/arch/arm64/kernel/pi/idreg-override.c
+++ b/arch/arm64/kernel/pi/idreg-override.c
@@ -159,6 +159,7 @@  static const struct ftr_set_desc sw_features __prel64_initconst = {
 	.fields		= {
 		FIELD("nokaslr", ARM64_SW_FEATURE_OVERRIDE_NOKASLR, NULL),
 		FIELD("hvhe", ARM64_SW_FEATURE_OVERRIDE_HVHE, hvhe_filter),
+		FIELD("rodataoff", ARM64_SW_FEATURE_OVERRIDE_RODATA_OFF, NULL),
 		{}
 	},
 };
@@ -190,6 +191,7 @@  static const struct {
 	{ "arm64.nomops",		"id_aa64isar2.mops=0" },
 	{ "arm64.nomte",		"id_aa64pfr1.mte=0" },
 	{ "nokaslr",			"arm64_sw.nokaslr=1" },
+	{ "rodata=off",			"arm64_sw.rodataoff=1" },
 };
 
 static int __init parse_hexdigit(const char *p, u64 *v)