diff mbox series

[v8,02/38] arm64: Add feature detection for fine grained traps

Message ID 20220125001114.193425-3-broonie@kernel.org (mailing list archive)
State New, archived
Headers show
Series arm64/sme: Initial support for the Scalable Matrix Extension | expand

Commit Message

Mark Brown Jan. 25, 2022, 12:10 a.m. UTC 
Some of the traps for nVHE SME support are provided as fine grained traps
so add detection of fine grained traps in order to allow us to guard usage.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 arch/arm64/kernel/cpufeature.c | 11 +++++++++++
 arch/arm64/tools/cpucaps       |  1 +
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index d9f09e40aaf6..ec060db1dcf0 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2400,6 +2400,17 @@  static const struct arm64_cpu_capabilities arm64_features[] = {
 		.matches = has_cpuid_feature,
 		.min_field_value = 1,
 	},
+	{
+		.desc = "Fine Grained Traps",
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.capability = ARM64_HAS_FGT,
+		.sys_reg = SYS_ID_AA64MMFR0_EL1,
+		.sign = FTR_UNSIGNED,
+		.field_pos = ID_AA64MMFR0_FGT_SHIFT,
+		.field_width = 4,
+		.min_field_value = 1,
+		.matches = has_cpuid_feature,
+	},
 	{},
 };
 
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 870c39537dd0..b3ada80aa48d 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -20,6 +20,7 @@  HAS_DCPOP
 HAS_E0PD
 HAS_ECV
 HAS_EPAN
+HAS_FGT
 HAS_GENERIC_AUTH
 HAS_GENERIC_AUTH_ARCH
 HAS_GENERIC_AUTH_IMP_DEF