Merge changes from topic "jc/AMUv1" into integration

* changes:
  docs(build-options): add build macros for features FGT,AMUv1 and ECV
  fix(amu): fault handling on EL2 context switch

Makefile

@@ -267,6 +267,16 @@ ifeq "8.5" "$(word 1, $(sort 8.5 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
 ENABLE_FEAT_SB		= 	1
 endif
 
+# Determine and enable FEAT_FGT to access HDFGRTR_EL2 register for v8.6 and higher versions.
+ifeq "8.6" "$(word 1, $(sort 8.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
+ENABLE_FEAT_FGT		=	1
+endif
+
+# Determine and enable FEAT_ECV to access CNTPOFF_EL2 register for v8.6 and higher versions.
+ifeq "8.6" "$(word 1, $(sort 8.6 $(ARM_ARCH_MAJOR).$(ARM_ARCH_MINOR)))"
+ENABLE_FEAT_ECV		=	1
+endif
+
 ifneq ($(findstring armclang,$(notdir $(CC))),)
 TF_CFLAGS_aarch32	=	-target arm-arm-none-eabi $(march32-directive)
 TF_CFLAGS_aarch64	=	-target aarch64-arm-none-eabi $(march64-directive)
@@ -1041,6 +1051,9 @@ $(eval $(call assert_booleans,\
         ENABLE_FEAT_HCX \
         ENABLE_MPMM \
         ENABLE_MPMM_FCONF \
+        ENABLE_FEAT_FGT \
+        ENABLE_FEAT_AMUv1 \
+        ENABLE_FEAT_ECV \
 )))
 
 $(eval $(call assert_numerics,\
@@ -1153,6 +1166,9 @@ $(eval $(call add_defines,\
         ENABLE_FEAT_HCX \
         ENABLE_MPMM \
         ENABLE_MPMM_FCONF \
+        ENABLE_FEAT_FGT \
+        ENABLE_FEAT_AMUv1 \
+        ENABLE_FEAT_ECV \
 )))
 
 ifeq (${SANITIZE_UB},trap)

docs/getting_started/build-options.rst

@@ -246,6 +246,24 @@ Common build options
    builds, but this behaviour can be overridden in each platform's Makefile or
    in the build command line.
 
+-  ``ENABLE_FEAT_AMUv1``: Boolean option to enable access to the HAFGRTR_EL2
+   (Hypervisor Activity Monitors Fine-Grained Read Trap Register) during EL2
+   to EL3 context save/restore operations. It is an optional feature available
+   on v8.4 and onwards and must be set to 1 alongside ``ENABLE_FEAT_FGT``, to
+   access the HAFGRTR_EL2 register. Defaults to ``0``.
+
+-  ``ENABLE_FEAT_ECV``: Boolean option to enable support for the Enhanced Counter
+   Virtualization feature, allowing for access to the CNTPOFF_EL2 (Counter-timer
+   Physical Offset register) during EL2 to EL3 context save/restore operations.
+   Its a mandatory architectural feature in Armv8.6 and defaults to ``1`` for
+   v8.6 or later CPUs.
+
+-  ``ENABLE_FEAT_FGT``: Boolean option to enable support for FGT (Fine Grain Traps)
+   feature allowing for access to the HDFGRTR_EL2 (Hypervisor Debug Fine-Grained
+   Read Trap Register)  during EL2 to EL3 context save/restore operations.
+   Its a mandatory architectural feature in Armv8.6 and defaults to ``1`` for
+   v8.6 or later CPUs.
+
 -  ``ENABLE_FEAT_HCX``: This option sets the bit SCR_EL3.HXEn in EL3 to allow
    access to HCRX_EL2 (extended hypervisor control register) from EL2 as well as
    adding HCRX_EL2 to the EL2 context save/restore operations.

include/lib/el3_runtime/aarch64/context.h

@@ -207,8 +207,8 @@
 #define CTX_MPAMVPMV_EL2	U(0x158)
 
 // Starting with Armv8.6
-#define CTX_HAFGRTR_EL2		U(0x160)
-#define CTX_HDFGRTR_EL2		U(0x168)
+#define CTX_HDFGRTR_EL2		U(0x160)
+#define CTX_HAFGRTR_EL2		U(0x168)
 #define CTX_HDFGWTR_EL2		U(0x170)
 #define CTX_HFGITR_EL2		U(0x178)
 #define CTX_HFGRTR_EL2		U(0x180)

lib/el3_runtime/aarch64/context.S

@@ -145,11 +145,14 @@ func el2_sysregs_context_save
 	stp	x11, x12, [x0, #CTX_MPAMVPM7_EL2]
 #endif
 
-#if ARM_ARCH_AT_LEAST(8, 6)
-	mrs	x13, HAFGRTR_EL2
-	mrs	x14, HDFGRTR_EL2
-	stp	x13, x14, [x0, #CTX_HAFGRTR_EL2]
-
+#if ENABLE_FEAT_FGT
+	mrs	x13, HDFGRTR_EL2
+#if ENABLE_FEAT_AMUv1
+   	mrs	x14, HAFGRTR_EL2
+   	stp	x13, x14, [x0, #CTX_HDFGRTR_EL2]
+#else
+   	str	x13, [x0, #CTX_HDFGRTR_EL2]
+#endif
 	mrs	x15, HDFGWTR_EL2
 	mrs	x16, HFGITR_EL2
 	stp	x15, x16, [x0, #CTX_HDFGWTR_EL2]
@@ -157,7 +160,9 @@ func el2_sysregs_context_save
 	mrs	x9, HFGRTR_EL2
 	mrs	x10, HFGWTR_EL2
 	stp	x9, x10, [x0, #CTX_HFGRTR_EL2]
+#endif
 
+#if ENABLE_FEAT_ECV
 	mrs	x11, CNTPOFF_EL2
 	str	x11, [x0, #CTX_CNTPOFF_EL2]
 #endif
@@ -319,10 +324,14 @@ func el2_sysregs_context_restore
 	msr	MPAMVPMV_EL2, x12
 #endif
 
-#if ARM_ARCH_AT_LEAST(8, 6)
-	ldp	x13, x14, [x0, #CTX_HAFGRTR_EL2]
-	msr	HAFGRTR_EL2, x13
-	msr	HDFGRTR_EL2, x14
+#if ENABLE_FEAT_FGT
+#if ENABLE_FEAT_AMUv1
+	ldp	x13, x14, [x0, #CTX_HDFGRTR_EL2]
+	msr	HAFGRTR_EL2, x14
+#else
+	ldr	x13, [x0, #CTX_HDFGRTR_EL2]
+#endif
+	msr	HDFGRTR_EL2, x13
 
 	ldp	x15, x16, [x0, #CTX_HDFGWTR_EL2]
 	msr	HDFGWTR_EL2, x15
@@ -331,7 +340,9 @@ func el2_sysregs_context_restore
 	ldp	x9, x10, [x0, #CTX_HFGRTR_EL2]
 	msr	HFGRTR_EL2, x9
 	msr	HFGWTR_EL2, x10
+#endif
 
+#if ENABLE_FEAT_ECV
 	ldr	x11, [x0, #CTX_CNTPOFF_EL2]
 	msr	CNTPOFF_EL2, x11
 #endif

make_helpers/defaults.mk

@@ -136,6 +136,9 @@ ENABLE_PAUTH			:= 0
 # Flag to enable access to the HCRX_EL2 register by setting SCR_EL3.HXEn.
 ENABLE_FEAT_HCX			:= 0
 
+# Flag to enable access to the HAFGRTR_EL2 register
+ENABLE_FEAT_AMUv1		:= 0
+
 # By default BL31 encryption disabled
 ENCRYPT_BL31			:= 0