Merge changes from topic "mp/feat_ras" into integration

* changes:
  refactor(cpufeat): enable FEAT_RAS for FEAT_STATE_CHECKED
  refactor(ras): replace RAS_EXTENSION with FEAT_RAS

30 files changed, 177 insertions, 137 deletions

diff --git a/Makefile b/Makefile
index e5063deb0..1a802447a 100644
--- a/Makefile
+++ b/Makefile
@@ -794,17 +794,23 @@ ifeq ($(RESET_TO_BL2)-$(BL2_IN_XIP_MEM),0-1)
 $(error "BL2_IN_XIP_MEM is only supported when RESET_TO_BL2 is enabled")
 endif
 
-# For RAS_EXTENSION, require that EAs are handled in EL3 first
+# RAS_EXTENSION is deprecated, provide alternate build options
 ifeq ($(RAS_EXTENSION),1)
+    $(error "RAS_EXTENSION is now deprecated, please use ENABLE_FEAT_RAS and RAS_FFH_SUPPORT instead")
+endif
+# RAS firmware first handling requires that EAs are handled in EL3 first
+ifeq ($(RAS_FFH_SUPPORT),1)
+    ifneq ($(ENABLE_FEAT_RAS),1)
+        $(error For RAS_FFH_SUPPORT, ENABLE_FEAT_RAS must also be 1)
+    endif
     ifneq ($(HANDLE_EA_EL3_FIRST_NS),1)
-        $(error For RAS_EXTENSION, HANDLE_EA_EL3_FIRST_NS must also be 1)
+        $(error For RAS_FFH_SUPPORT, HANDLE_EA_EL3_FIRST_NS must also be 1)
     endif
 endif
-
-# When FAULT_INJECTION_SUPPORT is used, require that RAS_EXTENSION is enabled
+# When FAULT_INJECTION_SUPPORT is used, require that FEAT_RAS is enabled
 ifeq ($(FAULT_INJECTION_SUPPORT),1)
-    ifneq ($(RAS_EXTENSION),1)
-        $(error For FAULT_INJECTION_SUPPORT, RAS_EXTENSION must also be 1)
+    ifeq ($(ENABLE_FEAT_RAS),0)
+        $(error For FAULT_INJECTION_SUPPORT, ENABLE_FEAT_RAS must not be 0)
     endif
 endif
 
@@ -1180,6 +1186,7 @@ $(eval $(call assert_booleans,\
 	ERRATA_ABI_SUPPORT \
 	ERRATA_NON_ARM_INTERCONNECT \
 	CONDITIONAL_CMO \
+	RAS_FFH_SUPPORT \
 )))
 
 $(eval $(call assert_numerics,\
@@ -1198,6 +1205,7 @@ $(eval $(call assert_numerics,\
         ENABLE_FEAT_AMU \
         ENABLE_FEAT_AMUv1p1 \
         ENABLE_FEAT_CSV2_2 \
+        ENABLE_FEAT_RAS	\
         ENABLE_FEAT_DIT \
         ENABLE_FEAT_ECV \
         ENABLE_FEAT_FGT \
@@ -1224,7 +1232,6 @@ $(eval $(call assert_numerics,\
         FW_ENC_STATUS \
         NR_OF_FW_BANKS \
         NR_OF_IMAGES_IN_FW_BANK \
-        RAS_EXTENSION \
         TWED_DELAY \
         ENABLE_FEAT_TWED \
         SVE_VECTOR_LEN \
@@ -1297,7 +1304,8 @@ $(eval $(call add_defines,\
         PROGRAMMABLE_RESET_ADDRESS \
         PSCI_EXTENDED_STATE_ID \
         PSCI_OS_INIT_MODE \
-        RAS_EXTENSION \
+        ENABLE_FEAT_RAS \
+        RAS_FFH_SUPPORT \
         RESET_TO_BL31 \
         SEPARATE_CODE_AND_RODATA \
         SEPARATE_BL2_NOLOAD_REGION \
diff --git a/bl31/aarch64/ea_delegate.S b/bl31/aarch64/ea_delegate.S
index 9419476ce..5d2534b27 100644
--- a/bl31/aarch64/ea_delegate.S
+++ b/bl31/aarch64/ea_delegate.S
@@ -153,7 +153,7 @@ endfunc handle_lower_el_async_ea
  * x1: EA syndrome
  */
 func delegate_sync_ea
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/*
 	 * Check for Uncontainable error type. If so, route to the platform
 	 * fatal error handler rather than the generic EA one.
@@ -183,7 +183,7 @@ endfunc delegate_sync_ea
  * x1: EA syndrome
  */
 func delegate_async_ea
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/* Check Exception Class to ensure SError, as this function should
 	 * only be invoked for SError. If that is not the case, which implies
 	 * either an HW error or programming error, panic.
diff --git a/bl31/aarch64/runtime_exceptions.S b/bl31/aarch64/runtime_exceptions.S
index 2fa9f06c5..a41737a7d 100644
--- a/bl31/aarch64/runtime_exceptions.S
+++ b/bl31/aarch64/runtime_exceptions.S
@@ -50,16 +50,16 @@
 	/*
 	 * Macro that prepares entry to EL3 upon taking an exception.
 	 *
-	 * With RAS_EXTENSION, this macro synchronizes pending errors with an ESB
-	 * instruction. When an error is thus synchronized, the handling is
+	 * With RAS_FFH_SUPPORT, this macro synchronizes pending errors with an
+	 * ESB instruction. When an error is thus synchronized, the handling is
 	 * delegated to platform EA handler.
 	 *
-	 * Without RAS_EXTENSION, this macro synchronizes pending errors using
+	 * Without RAS_FFH_SUPPORT, this macro synchronizes pending errors using
 	 * a DSB, unmasks Asynchronous External Aborts and saves X30 before
 	 * setting the flag CTX_IS_IN_EL3.
 	 */
 	.macro check_and_unmask_ea
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/* Synchronize pending External Aborts */
 	esb
 
@@ -307,7 +307,7 @@ vector_entry fiq_sp_elx
 end_vector_entry fiq_sp_elx
 
 vector_entry serror_sp_elx
-#if !RAS_EXTENSION
+#if !RAS_FFH_SUPPORT
 	/*
 	 * This will trigger if the exception was taken due to SError in EL3 or
 	 * because of pending asynchronous external aborts from lower EL that got
@@ -359,7 +359,7 @@ end_vector_entry fiq_aarch64
 vector_entry serror_aarch64
 	save_x30
 	apply_at_speculative_wa
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	msr	daifclr, #DAIF_ABT_BIT
 #else
 	check_and_unmask_ea
@@ -402,7 +402,7 @@ end_vector_entry fiq_aarch32
 vector_entry serror_aarch32
 	save_x30
 	apply_at_speculative_wa
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	msr	daifclr, #DAIF_ABT_BIT
 #else
 	check_and_unmask_ea
diff --git a/common/feat_detect.c b/common/feat_detect.c
index eb4db95a0..50b74d0c8 100644
--- a/common/feat_detect.c
+++ b/common/feat_detect.c
@@ -60,16 +60,6 @@ check_feature(int state, unsigned long field, const char *feat_name,
 	}
 }
 
-/*******************************************************************************
- * Feature : FEAT_RAS (Reliability, Availability, and Serviceability Extension)
- ******************************************************************************/
-static void read_feat_ras(void)
-{
-#if (RAS_EXTENSION == FEAT_STATE_ALWAYS)
-	feat_detect_panic(is_armv8_2_feat_ras_present(), "RAS");
-#endif
-}
-
 /************************************************
  * Feature : FEAT_PAUTH (Pointer Authentication)
  ***********************************************/
@@ -160,9 +150,9 @@ void detect_arch_features(void)
 	check_feature(ENABLE_FEAT_VHE, read_feat_vhe_id_field(), "VHE", 1, 1);
 
 	/* v8.2 features */
-	read_feat_ras();
 	check_feature(ENABLE_SVE_FOR_NS, read_feat_sve_id_field(),
 		      "SVE", 1, 1);
+	check_feature(ENABLE_FEAT_RAS, read_feat_ras_id_field(), "RAS", 1, 2);
 
 	/* v8.3 features */
 	read_feat_pauth();
diff --git a/docs/components/ras.rst b/docs/components/ras.rst
index 871be2d76..8d003452c 100644
--- a/docs/components/ras.rst
+++ b/docs/components/ras.rst
@@ -1,45 +1,89 @@
 Reliability, Availability, and Serviceability (RAS) Extensions
-==============================================================
+**************************************************************
 
 This document describes |TF-A| support for Arm Reliability, Availability, and
 Serviceability (RAS) extensions. RAS is a mandatory extension for Armv8.2 and
 later CPUs, and also an optional extension to the base Armv8.0 architecture.
 
-In conjunction with the |EHF|, support for RAS extension enables firmware-first
-paradigm for handling platform errors: exceptions resulting from errors in
-Non-secure world are routed to and handled in EL3.
-Said errors are Synchronous External Abort (SEA), Asynchronous External Abort
-(signalled as SErrors), Fault Handling and Error Recovery interrupts.
-The |EHF| document mentions various :ref:`error handling
-use-cases <delegation-use-cases>` .
-
 For the description of Arm RAS extensions, Standard Error Records, and the
 precise definition of RAS terminology, please refer to the Arm Architecture
-Reference Manual. The rest of this document assumes familiarity with
-architecture and terminology.
+Reference Manual and `RAS Supplement`_. The rest of this document assumes
+familiarity with architecture and terminology.
+
+There are two philosophies for handling RAS errors from Non-secure world point
+of view.
+
+- :ref:`Firmware First Handling (FFH)`
+- :ref:`Kernel First Handling (KFH)`
+
+.. _Firmware First Handling (FFH):
+
+Firmware First Handling (FFH)
+=============================
+
+Introduction
+------------
+
+EA’s and Error interrupts corresponding to NS nodes are handled first in firmware
+
+-  Errors signaled back to NS world via suitable mechanism
+-  Kernel is prohibited from accessing the RAS error records directly
+-  Firmware creates CPER records for kernel to navigate and process
+-  Firmware signals error back to Kernel via SDEI
 
 Overview
 --------
 
-As mentioned above, the RAS support in |TF-A| enables routing to and handling of
-exceptions resulting from platform errors in EL3. It allows the platform to
-define an External Abort handler, and to register RAS nodes and interrupts. RAS
-framework also provides `helpers`__ for accessing Standard Error Records as
-introduced by the RAS extensions.
+FFH works in conjunction with `Exception Handling Framework`. Exceptions resulting from
+errors in Non-secure world are routed to and handled in EL3. Said errors are Synchronous
+External Abort (SEA), Asynchronous External Abort (signalled as SErrors), Fault Handling
+and Error Recovery interrupts.
+RAS Framework in TF-A allows the platform to define an external abort handler and to
+register RAS nodes and interrupts. It also provides `helpers`__ for accessing Standard
+Error Records as introduced by the RAS extensions
+
 
 .. __: `Standard Error Record helpers`_
 
-The build option ``RAS_EXTENSION`` when set to ``1`` includes the RAS in run
-time firmware; ``EL3_EXCEPTION_HANDLING`` and ``HANDLE_EA_EL3_FIRST_NS`` must also
-be set ``1``. ``RAS_TRAP_NS_ERR_REC_ACCESS`` controls the access to the RAS
-error record registers from Non-secure.
+.. _Kernel First Handling (KFH):
+
+Kernel First Handling (KFH)
+===========================
+
+Introduction
+------------
+
+EA's originating/attributed to NS world are handled first in NS and Kernel navigates
+the std error records directly.
+
+**KFH can be supported in a platform without TF-A being aware of it but there are few
+corner cases where TF-A needs to have special handling, which is currently missing and
+will be added in future**
+
+TF-A build options
+==================
+
+- **ENABLE_FEAT_RAS**: Manage FEAT_RAS extension when switching the world.
+- **RAS_FFH_SUPPORT**: Pull in necessary framework and platform hooks for Firmware first
+  handling(FFH) of RAS errors.
+- **RAS_TRAP_NS_ERR_REC_ACCESS**: Trap Non-secure access of RAS error record registers.
+- **RAS_EXTENSION**: Deprecated macro, equivalent to ENABLE_FEAT_RAS and RAS_FFH_SUPPORT
+  put together.
+
+RAS feature has dependency on some other TF-A build flags
+
+- **EL3_EXCEPTION_HANDLING**: Required for FFH
+- **HANDLE_EA_EL3_FIRST_NS**: Required for FFH
+- **FAULT_INJECTION_SUPPORT**: Required for testing RAS feature on fvp platform
+
+RAS Framework
+=============
+
 
 .. _ras-figure:
 
 .. image:: ../resources/diagrams/draw.io/ras.svg
 
-See more on `Engaging the RAS framework`_.
-
 Platform APIs
 -------------
 
@@ -191,19 +235,10 @@ doesn't return.
 Engaging the RAS framework
 --------------------------
 
-Enabling RAS support is a platform choice constructed from three distinct, but
-related, build options:
-
--  ``RAS_EXTENSION=1`` includes the RAS framework in the run time firmware;
-
--  ``EL3_EXCEPTION_HANDLING=1`` enables handling of exceptions at EL3. See
-   `Interaction with Exception Handling Framework`_;
-
--  ``HANDLE_EA_EL3_FIRST_NS=1`` enables routing of External Aborts and SErrors,
-   resulting from errors in NS world, to EL3.
+Enabling RAS support is a platform choice
 
 The RAS support in |TF-A| introduces a default implementation of
-``plat_ea_handler``, the External Abort handler in EL3. When ``RAS_EXTENSION``
+``plat_ea_handler``, the External Abort handler in EL3. When ``RAS_FFH_SUPPORT``
 is set to ``1``, it'll first call ``ras_ea_handler()`` function, which is the
 top-level RAS exception handler. ``ras_ea_handler`` is responsible for iterating
 to through platform-supplied error records, probe them, and when an error is
@@ -239,4 +274,6 @@ for non-interrupt exceptions, they're explicit using :ref:`EHF APIs
 
 --------------
 
-*Copyright (c) 2018-2019, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2018-2023, Arm Limited and Contributors. All rights reserved.*
+
+.. _RAS Supplement: https://developer.arm.com/documentation/ddi0587/latest
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 6dd4ed21a..4eafb392b 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -775,15 +775,14 @@ Common build options
 -  ``PSCI_OS_INIT_MODE``: Boolean flag to enable support for optional PSCI
    OS-initiated mode. This option defaults to 0.
 
--  ``RAS_EXTENSION``: Numeric value to enable Armv8.2 RAS features. RAS features
+-  ``ENABLE_FEAT_RAS``: Numeric value to enable Armv8.2 RAS features. RAS features
    are an optional extension for pre-Armv8.2 CPUs, but are mandatory for Armv8.2
    or later CPUs. This flag can take the values 0 to 2, to align with the
    ``FEATURE_DETECTION`` mechanism.
 
-   When ``RAS_EXTENSION`` is set to ``1``, ``HANDLE_EA_EL3_FIRST_NS`` must also be
-   set to ``1``.
-
-   This option is disabled by default.
+-  ``RAS_FFH_SUPPORT``: Support to enable Firmware first handling of RAS errors
+   originating from NS world. When ``RAS_FFH_SUPPORT`` is set to ``1``,
+   ``HANDLE_EA_EL3_FIRST_NS`` and ``ENABLE_FEAT_RAS`` must also be set to ``1``.
 
 -  ``RESET_TO_BL31``: Enable BL31 entrypoint as the CPU reset vector instead
    of the BL1 entrypoint. It can take the value 0 (CPU reset to BL1
diff --git a/docs/porting-guide.rst b/docs/porting-guide.rst
index 1225a9f79..1250071ef 100644
--- a/docs/porting-guide.rst
+++ b/docs/porting-guide.rst
@@ -3418,11 +3418,11 @@ The third parameter (``void *cookie``) is unused for now. The fourth parameter
 (``uint64_t flags``) indicates the preempted security state. These parameters
 are received from the top-level exception handler.
 
-If ``RAS_EXTENSION`` is set to ``1``, the default implementation of this
+If ``RAS_FFH_SUPPORT`` is set to ``1``, the default implementation of this
 function iterates through RAS handlers registered by the platform. If any of the
 RAS handlers resolve the External Abort, no further action is taken.
 
-If ``RAS_EXTENSION`` is set to ``0``, or if none of the platform RAS handlers
+If ``RAS_FFH_SUPPORT`` is set to ``0``, or if none of the platform RAS handlers
 could resolve the External Abort, the default implementation prints an error
 message, and panics.
 
diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index ac5eae249..20206c1c3 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -393,6 +393,9 @@
 #define ID_AA64PFR1_EL1_RNG_TRAP_SUPPORTED	ULL(0x1)
 #define ID_AA64PFR1_EL1_RNG_TRAP_NOT_SUPPORTED	ULL(0x0)
 
+#define VDISR_EL2				S3_4_C12_C1_1
+#define VSESR_EL2				S3_4_C5_C2_3
+
 /* Memory Tagging Extension is not implemented */
 #define MTE_UNIMPLEMENTED	U(0)
 /* FEAT_MTE: MTE instructions accessible at EL0 are implemented */
diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index a0141defa..d6f12f3f2 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -499,14 +499,22 @@ static inline bool is_feat_sve_supported(void)
 	return read_feat_sve_id_field() >= ID_AA64PFR0_SVE_SUPPORTED;
 }
 
-/*******************************************************************************
- * Function to identify the presence of FEAT_RAS (Reliability,Availability,
- * and Serviceability Extension)
- ******************************************************************************/
-static inline bool is_armv8_2_feat_ras_present(void)
+static unsigned int read_feat_ras_id_field(void)
+{
+	return ISOLATE_FIELD(read_id_aa64pfr0_el1(), ID_AA64PFR0_RAS);
+}
+
+static inline bool is_feat_ras_supported(void)
 {
-	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_RAS_SHIFT) &
-		ID_AA64PFR0_RAS_MASK) != ID_AA64PFR0_RAS_NOT_SUPPORTED);
+	if (ENABLE_FEAT_RAS == FEAT_STATE_DISABLED) {
+		return false;
+	}
+
+	if (ENABLE_FEAT_RAS == FEAT_STATE_ALWAYS) {
+		return true;
+	}
+
+	return read_feat_ras_id_field() != 0U;
 }
 
 static unsigned int read_feat_dit_id_field(void)
diff --git a/include/arch/aarch64/arch_helpers.h b/include/arch/aarch64/arch_helpers.h
index 1b4bc1113..5b3d4c26f 100644
--- a/include/arch/aarch64/arch_helpers.h
+++ b/include/arch/aarch64/arch_helpers.h
@@ -549,6 +549,10 @@ DEFINE_RENAME_SYSREG_RW_FUNCS(ttbr1_el2, TTBR1_EL2)
 /* Armv8.2 ID Registers */
 DEFINE_RENAME_IDREG_READ_FUNC(id_aa64mmfr2_el1, ID_AA64MMFR2_EL1)
 
+/* Armv8.2 RAS Registers */
+DEFINE_RENAME_SYSREG_RW_FUNCS(vdisr_el2, VDISR_EL2)
+DEFINE_RENAME_SYSREG_RW_FUNCS(vsesr_el2, VSESR_EL2)
+
 /* Armv8.2 MPAM Registers */
 DEFINE_RENAME_SYSREG_READ_FUNC(mpamidr_el1, MPAMIDR_EL1)
 DEFINE_RENAME_SYSREG_RW_FUNCS(mpam3_el3, MPAM3_EL3)
diff --git a/include/lib/el3_runtime/aarch64/context.h b/include/lib/el3_runtime/aarch64/context.h
index dd2b83681..e6af43e58 100644
--- a/include/lib/el3_runtime/aarch64/context.h
+++ b/include/lib/el3_runtime/aarch64/context.h
@@ -523,10 +523,6 @@ void el2_sysregs_context_restore_common(el2_sysregs_t *regs);
 void el2_sysregs_context_save_mte(el2_sysregs_t *regs);
 void el2_sysregs_context_restore_mte(el2_sysregs_t *regs);
 #endif /* CTX_INCLUDE_MTE_REGS */
-#if RAS_EXTENSION
-void el2_sysregs_context_save_ras(el2_sysregs_t *regs);
-void el2_sysregs_context_restore_ras(el2_sysregs_t *regs);
-#endif /* RAS_EXTENSION */
 #endif /* CTX_INCLUDE_EL2_REGS */
 
 #if CTX_INCLUDE_FPREGS
diff --git a/lib/el3_runtime/aarch64/context.S b/lib/el3_runtime/aarch64/context.S
index 769117163..0f2dfeb77 100644
--- a/lib/el3_runtime/aarch64/context.S
+++ b/lib/el3_runtime/aarch64/context.S
@@ -17,10 +17,6 @@
 	.global	el2_sysregs_context_save_mte
 	.global	el2_sysregs_context_restore_mte
 #endif /* CTX_INCLUDE_MTE_REGS */
-#if RAS_EXTENSION
-	.global	el2_sysregs_context_save_ras
-	.global	el2_sysregs_context_restore_ras
-#endif /* RAS_EXTENSION */
 #endif /* CTX_INCLUDE_EL2_REGS */
 
 	.global	el1_sysregs_context_save
@@ -210,30 +206,6 @@ func el2_sysregs_context_restore_mte
 endfunc el2_sysregs_context_restore_mte
 #endif /* CTX_INCLUDE_MTE_REGS */
 
-#if RAS_EXTENSION
-func el2_sysregs_context_save_ras
-	/*
-	 * VDISR_EL2 and VSESR_EL2 registers are saved only when
-	 * FEAT_RAS is supported.
-	 */
-	mrs	x11, vdisr_el2
-	mrs	x12, vsesr_el2
-	stp	x11, x12, [x0, #CTX_VDISR_EL2]
-	ret
-endfunc el2_sysregs_context_save_ras
-
-func el2_sysregs_context_restore_ras
-	/*
-	 * VDISR_EL2 and VSESR_EL2 registers are restored only when FEAT_RAS
-	 * is supported.
-	 */
-	ldp	x11, x12, [x0, #CTX_VDISR_EL2]
-	msr	vdisr_el2, x11
-	msr	vsesr_el2, x12
-	ret
-endfunc el2_sysregs_context_restore_ras
-#endif /* RAS_EXTENSION */
-
 #endif /* CTX_INCLUDE_EL2_REGS */
 
 /* ------------------------------------------------------------------
@@ -855,7 +827,12 @@ sve_not_enabled:
 1:
 #endif /* IMAGE_BL31 && DYNAMIC_WORKAROUND_CVE_2018_3639 */
 
-#if IMAGE_BL31 && RAS_EXTENSION
+/*
+ * This is a hot path, so we don't want to do some actual FEAT_RAS runtime
+ * detection here. The "esb" is a cheaper variant, so using "dsb" in the
+ * ENABLE_FEAT_RAS==2 case is not ideal, but won't hurt.
+ */
+#if IMAGE_BL31 && ENABLE_FEAT_RAS == 1
 	/* ----------------------------------------------------------
 	 * Issue Error Synchronization Barrier to synchronize SErrors
 	 * before exiting EL3. We're running with EAs unmasked, so
@@ -866,7 +843,7 @@ sve_not_enabled:
 	esb
 #else
 	dsb	sy
-#endif /* IMAGE_BL31 && RAS_EXTENSION */
+#endif /* IMAGE_BL31 && ENABLE_FEAT_RAS */
 
 	/* ----------------------------------------------------------
 	 * Restore SPSR_EL3, ELR_EL3 and SCR_EL3 prior to ERET
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index 744e4f910..2a9bb5924 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -1013,9 +1013,13 @@ void cm_el2_sysregs_context_save(uint32_t security_state)
 			write_ctx_reg(el2_sysregs_ctx, CTX_TTBR1_EL2,
 				      read_ttbr1_el2());
 		}
-#if RAS_EXTENSION
-		el2_sysregs_context_save_ras(el2_sysregs_ctx);
-#endif
+
+		if (is_feat_ras_supported()) {
+			write_ctx_reg(el2_sysregs_ctx, CTX_VDISR_EL2,
+				      read_vdisr_el2());
+			write_ctx_reg(el2_sysregs_ctx, CTX_VSESR_EL2,
+				      read_vsesr_el2());
+		}
 
 		if (is_feat_nv2_supported()) {
 			write_ctx_reg(el2_sysregs_ctx, CTX_VNCR_EL2,
@@ -1096,9 +1100,11 @@ void cm_el2_sysregs_context_restore(uint32_t security_state)
 			write_contextidr_el2(read_ctx_reg(el2_sysregs_ctx, CTX_CONTEXTIDR_EL2));
 			write_ttbr1_el2(read_ctx_reg(el2_sysregs_ctx, CTX_TTBR1_EL2));
 		}
-#if RAS_EXTENSION
-		el2_sysregs_context_restore_ras(el2_sysregs_ctx);
-#endif
+
+		if (is_feat_ras_supported()) {
+			write_vdisr_el2(read_ctx_reg(el2_sysregs_ctx, CTX_VDISR_EL2));
+			write_vsesr_el2(read_ctx_reg(el2_sysregs_ctx, CTX_VSESR_EL2));
+		}
 
 		if (is_feat_nv2_supported()) {
 			write_vncr_el2(read_ctx_reg(el2_sysregs_ctx, CTX_VNCR_EL2));
diff --git a/make_helpers/arch_features.mk b/make_helpers/arch_features.mk
index 01e3e096d..b799697fb 100644
--- a/make_helpers/arch_features.mk
+++ b/make_helpers/arch_features.mk
@@ -13,6 +13,11 @@ ENABLE_FEAT_PAN		=	1
 ENABLE_FEAT_VHE		=	1
 endif
 
+# Enable the features which are mandatory from ARCH version 8.2 and upwards.
+ifeq "8.2" "$(word 1, $(sort 8.2 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
+ENABLE_FEAT_RAS		=	1
+endif
+
 # Enable the features which are mandatory from ARCH version 8.4 and upwards.
 ifeq "8.4" "$(word 1, $(sort 8.4 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
 ENABLE_FEAT_DIT		=	1
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index 416547003..f9077eb9b 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -276,8 +276,9 @@ PSCI_EXTENDED_STATE_ID		:= 0
 # Enable PSCI OS-initiated mode support
 PSCI_OS_INIT_MODE		:= 0
 
-# Enable RAS support
-RAS_EXTENSION			:= 0
+# Enable RAS Support
+ENABLE_FEAT_RAS			:= 0
+RAS_FFH_SUPPORT			:= 0
 
 # By default, BL1 acts as the reset handler, not BL31
 RESET_TO_BL31			:= 0
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 863eb0e65..0433b61d5 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -50,6 +50,7 @@ ifneq (${SPD}, tspd)
 	ENABLE_FEAT_RNG			:= 2
 	ENABLE_FEAT_TWED		:= 2
 	ENABLE_FEAT_GCS			:= 2
+	ENABLE_FEAT_RAS			:= 2
 ifeq (${ARCH}, aarch64)
 ifneq (${SPD}, spmd)
 ifeq (${SPM_MM}, 0)
@@ -387,7 +388,7 @@ BL31_SOURCES		+=	lib/cpus/aarch64/cortex_a75_pubsub.c	\
 endif
 endif
 
-ifeq (${RAS_EXTENSION},1)
+ifeq (${RAS_FFH_SUPPORT},1)
 BL31_SOURCES		+=	plat/arm/board/fvp/aarch64/fvp_ras.c
 endif
 
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index c75507a51..98c2e0ed6 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -20,7 +20,9 @@ CSS_LOAD_SCP_IMAGES	:=	1
 
 CSS_USE_SCMI_SDS_DRIVER	:=	1
 
-RAS_EXTENSION		:=	0
+ENABLE_FEAT_RAS		:=	1
+
+RAS_FFH_SUPPORT		:=	0
 
 SDEI_SUPPORT		:=	0
 
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 8c62a9bb9..cfd1aac08 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -295,7 +295,7 @@ void arm_bl31_platform_setup(void)
 	/* Initialize power controller before setting up topology */
 	plat_arm_pwrc_setup();
 
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	ras_init();
 #endif
 
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index fca6f4f95..647a9d932 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -386,7 +386,7 @@ endif
 endif
 
 # RAS sources
-ifeq (${RAS_EXTENSION},1)
+ifeq (${RAS_FFH_SUPPORT},1)
 BL31_SOURCES		+=	lib/extensions/ras/std_err_record.c		\
 				lib/extensions/ras/ras_common.c
 endif
diff --git a/plat/arm/css/sgi/include/sgi_base_platform_def.h b/plat/arm/css/sgi/include/sgi_base_platform_def.h
index c1fadc654..c6cf0e616 100644
--- a/plat/arm/css/sgi/include/sgi_base_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_base_platform_def.h
@@ -206,7 +206,7 @@
 
 #define PLAT_SP_PRI				PLAT_RAS_PRI
 
-#if SPM_MM && RAS_EXTENSION
+#if SPM_MM && RAS_FFH_SUPPORT
 /*
  * CPER buffer memory of 128KB is reserved and it is placed adjacent to the
  * memory shared between EL3 and S-EL0.
@@ -235,7 +235,7 @@
  */
 #define PLAT_ARM_SP_IMAGE_STACK_BASE	(PLAT_SP_IMAGE_NS_BUF_BASE +	\
 					 PLAT_SP_IMAGE_NS_BUF_SIZE)
-#endif /* SPM_MM && RAS_EXTENSION */
+#endif /* SPM_MM && RAS_FFH_SUPPORT */
 
 /* Platform ID address */
 #define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
diff --git a/plat/arm/css/sgi/sgi-common.mk b/plat/arm/css/sgi/sgi-common.mk
index 282a5f080..6d17bc22f 100644
--- a/plat/arm/css/sgi/sgi-common.mk
+++ b/plat/arm/css/sgi/sgi-common.mk
@@ -8,7 +8,9 @@ CSS_USE_SCMI_SDS_DRIVER		:=	1
 
 CSS_ENT_BASE			:=	plat/arm/css/sgi
 
-RAS_EXTENSION			:=	0
+ENABLE_FEAT_RAS			:=	1
+
+RAS_FFH_SUPPORT			:=	0
 
 SDEI_SUPPORT			:=	0
 
@@ -52,7 +54,7 @@ BL31_SOURCES		+=	${INTERCONNECT_SOURCES}			\
 				${CSS_ENT_BASE}/sgi_bl31_setup.c	\
 				${CSS_ENT_BASE}/sgi_topology.c
 
-ifeq (${RAS_EXTENSION},1)
+ifeq (${RAS_FFH_SUPPORT},1)
 BL31_SOURCES		+=	${CSS_ENT_BASE}/sgi_ras.c
 endif
 
diff --git a/plat/arm/css/sgi/sgi_bl31_setup.c b/plat/arm/css/sgi/sgi_bl31_setup.c
index df2ce387a..9c8d16341 100644
--- a/plat/arm/css/sgi/sgi_bl31_setup.c
+++ b/plat/arm/css/sgi/sgi_bl31_setup.c
@@ -106,7 +106,7 @@ void sgi_bl31_common_platform_setup(void)
 {
 	arm_bl31_platform_setup();
 
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	sgi_ras_intr_handler_setup();
 #endif
 
diff --git a/plat/arm/css/sgi/sgi_plat.c b/plat/arm/css/sgi/sgi_plat.c
index b8ba49f7e..7f79d5409 100644
--- a/plat/arm/css/sgi/sgi_plat.c
+++ b/plat/arm/css/sgi/sgi_plat.c
@@ -93,7 +93,7 @@ const mmap_region_t plat_arm_secure_partition_mmap[] = {
 	PLAT_ARM_SECURE_MAP_DEVICE,
 	ARM_SP_IMAGE_MMAP,
 	ARM_SP_IMAGE_NS_BUF_MMAP,
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	CSS_SGI_SP_CPER_BUF_MMAP,
 #endif
 	ARM_SP_IMAGE_RW_MMAP,
diff --git a/plat/common/aarch64/plat_common.c b/plat/common/aarch64/plat_common.c
index 042916a7d..eca81b11f 100644
--- a/plat/common/aarch64/plat_common.c
+++ b/plat/common/aarch64/plat_common.c
@@ -11,7 +11,7 @@
 #include <arch_helpers.h>
 #include <common/debug.h>
 #include <drivers/console.h>
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 #include <lib/extensions/ras.h>
 #endif
 #include <lib/xlat_tables/xlat_mmu_helpers.h>
@@ -81,7 +81,7 @@ const char *get_el_str(unsigned int el)
 void plat_default_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie,
 		void *handle, uint64_t flags)
 {
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/* Call RAS EA handler */
 	int handled = ras_ea_handler(ea_reason, syndrome, cookie, handle, flags);
 	if (handled != 0)
diff --git a/plat/common/aarch64/plat_ehf.c b/plat/common/aarch64/plat_ehf.c
index da768843e..e8197b3e5 100644
--- a/plat/common/aarch64/plat_ehf.c
+++ b/plat/common/aarch64/plat_ehf.c
@@ -12,7 +12,7 @@
  * Enumeration of priority levels on ARM platforms.
  */
 ehf_pri_desc_t plat_exceptions[] = {
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/* RAS Priority */
 	EHF_PRI_DESC(PLAT_PRI_BITS, PLAT_RAS_PRI),
 #endif
diff --git a/plat/nvidia/tegra/include/tegra_private.h b/plat/nvidia/tegra/include/tegra_private.h
index 71bea0845..f93585d9d 100644
--- a/plat/nvidia/tegra/include/tegra_private.h
+++ b/plat/nvidia/tegra/include/tegra_private.h
@@ -154,7 +154,7 @@ int plat_sip_handler(uint32_t smc_fid,
 		     void *handle,
 		     uint64_t flags);
 
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 void tegra194_ras_enable(void);
 void tegra194_ras_corrected_err_clear(uint64_t *cookie);
 #endif
diff --git a/plat/nvidia/tegra/soc/t194/plat_ras.c b/plat/nvidia/tegra/soc/t194/plat_ras.c
index a9fed0ac7..248f16392 100644
--- a/plat/nvidia/tegra/soc/t194/plat_ras.c
+++ b/plat/nvidia/tegra/soc/t194/plat_ras.c
@@ -484,7 +484,7 @@ REGISTER_RAS_INTERRUPTS(carmel_ras_interrupts);
 void plat_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie,
 		void *handle, uint64_t flags)
 {
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	tegra194_ea_handler(ea_reason, syndrome, cookie, handle, flags);
 #else
 	plat_default_ea_handler(ea_reason, syndrome, cookie, handle, flags);
diff --git a/plat/nvidia/tegra/soc/t194/plat_setup.c b/plat/nvidia/tegra/soc/t194/plat_setup.c
index 8f7d1e9a1..d3d09d3dc 100644
--- a/plat/nvidia/tegra/soc/t194/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t194/plat_setup.c
@@ -254,7 +254,7 @@ void plat_early_platform_setup(void)
 	/* sanity check MCE firmware compatibility */
 	mce_verify_firmware_version();
 
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	/* Enable Uncorrectable RAS error */
 	tegra194_ras_enable();
 #endif
diff --git a/plat/nvidia/tegra/soc/t194/plat_sip_calls.c b/plat/nvidia/tegra/soc/t194/plat_sip_calls.c
index 1eef55912..f0704edb1 100644
--- a/plat/nvidia/tegra/soc/t194/plat_sip_calls.c
+++ b/plat/nvidia/tegra/soc/t194/plat_sip_calls.c
@@ -71,7 +71,7 @@ int32_t plat_sip_handler(uint32_t smc_fid,
 
 		break;
 
-#if RAS_EXTENSION
+#if RAS_FFH_SUPPORT
 	case TEGRA_SIP_CLEAR_RAS_CORRECTED_ERRORS:
 	{
 		/*
diff --git a/plat/nvidia/tegra/soc/t194/platform_t194.mk b/plat/nvidia/tegra/soc/t194/platform_t194.mk
index 631c92691..a183d0e9d 100644
--- a/plat/nvidia/tegra/soc/t194/platform_t194.mk
+++ b/plat/nvidia/tegra/soc/t194/platform_t194.mk
@@ -34,7 +34,8 @@ $(eval $(call add_define,MAX_MMAP_REGIONS))
 
 # enable RAS handling
 HANDLE_EA_EL3_FIRST_NS			:= 1
-RAS_EXTENSION				:= 1
+ENABLE_FEAT_RAS				:= 1
+RAS_FFH_SUPPORT				:= 1
 
 # platform files
 PLAT_INCLUDES		+=	-Iplat/nvidia/tegra/include/t194 \
@@ -68,7 +69,7 @@ BL31_SOURCES		+=	${TEGRA_DRIVERS}/spe/shared_console.S
 endif
 
 # RAS sources
-ifeq (${RAS_EXTENSION},1)
+ifeq (${RAS_FFH_SUPPORT},1)
 BL31_SOURCES		+=	lib/extensions/ras/std_err_record.c		\
 				lib/extensions/ras/ras_common.c			\
 				${SOC_DIR}/plat_ras.c