arm64: Add FEAT_FGT2 capability

As we will eventually have to context-switch the FEAT_FGT2 registers
in KVM (something that has been completely ignored so far), add
a new cap that we will be able to check for.

Signed-off-by: Marc Zyngier <maz@kernel.org>

arch/arm64/kernel/cpufeature.c

@@ -2876,6 +2876,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.matches = has_cpuid_feature,
 		ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, IMP)
 	},
+	{
+		.desc = "Fine Grained Traps 2",
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.capability = ARM64_HAS_FGT2,
+		.matches = has_cpuid_feature,
+		ARM64_CPUID_FIELDS(ID_AA64MMFR0_EL1, FGT, FGT2)
+	},
 #ifdef CONFIG_ARM64_SME
 	{
 		.desc = "Scalable Matrix Extension",

arch/arm64/tools/cpucaps

@@ -28,6 +28,7 @@ HAS_EPAN
 HAS_EVT
 HAS_FPMR
 HAS_FGT
+HAS_FGT2
 HAS_FPSIMD
 HAS_GCS
 HAS_GENERIC_AUTH