arm64: alternative: Introduce feature for GICv3 CPU interface
Add a new item to the feature set (ARM64_HAS_SYSREG_GIC_CPUIF)
to indicate that we have a system register GIC CPU interface
This will help KVM switching to alternative instruction patching.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 82cb9f9..c104421 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -24,8 +24,9 @@
#define ARM64_WORKAROUND_CLEAN_CACHE 0
#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE 1
#define ARM64_WORKAROUND_845719 2
+#define ARM64_HAS_SYSREG_GIC_CPUIF 3
-#define ARM64_NCAPS 3
+#define ARM64_NCAPS 4
#ifndef __ASSEMBLY__
@@ -38,6 +39,11 @@
u32 midr_model;
u32 midr_range_min, midr_range_max;
};
+
+ struct { /* Feature register checking */
+ u64 register_mask;
+ u64 register_value;
+ };
};
};