Merge changes from topic "ns/save_fpregs_context" into integration

* changes:
  feat(sgi): enable fpregs context save and restore
  feat(spm_mm): add support to save and restore fp regs

plat/arm/css/sgi/sgi-common.mk

@@ -23,6 +23,8 @@ CSS_SGI_PLATFORM_VARIANT	:=	0
 # Do not enable SVE
 ENABLE_SVE_FOR_NS		:=	0
 
+CTX_INCLUDE_FPREGS		:=	1
+
 INTERCONNECT_SOURCES	:=	${CSS_ENT_BASE}/sgi_interconnect.c
 
 PLAT_INCLUDES		+=	-I${CSS_ENT_BASE}/include

services/std_svc/spm/spm_mm/spm_mm.mk

@@ -16,6 +16,9 @@ endif
 ifeq (${ENABLE_SME_FOR_NS},1)
         $(error "Error: SPM_MM is not compatible with ENABLE_SME_FOR_NS")
 endif
+ifeq (${CTX_INCLUDE_FPREGS},0)
+        $(warning "Warning: SPM_MM: CTX_INCLUDE_FPREGS is set to 0")
+endif
 
 SPM_MM_SOURCES	:=	$(addprefix services/std_svc/spm/spm_mm/,	\
 			${ARCH}/spm_mm_shim_exceptions.S		\

services/std_svc/spm/spm_mm/spm_mm_main.c

@@ -190,6 +190,14 @@ uint64_t spm_mm_sp_call(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3)
 	uint64_t rc;
 	sp_context_t *sp_ptr = &sp_ctx;
 
+#if CTX_INCLUDE_FPREGS
+	/*
+	 * SP runs to completion, no need to restore FP registers of secure context.
+	 * Save FP registers only for non secure context.
+	 */
+	fpregs_context_save(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+#endif
+
 	/* Wait until the Secure Partition is idle and set it to busy. */
 	sp_state_wait_switch(sp_ptr, SP_STATE_IDLE, SP_STATE_BUSY);
 
@@ -208,6 +216,14 @@ uint64_t spm_mm_sp_call(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3)
 	assert(sp_ptr->state == SP_STATE_BUSY);
 	sp_state_set(sp_ptr, SP_STATE_IDLE);
 
+#if CTX_INCLUDE_FPREGS
+	/*
+	 * SP runs to completion, no need to save FP registers of secure context.
+	 * Restore only non secure world FP registers.
+	 */
+	fpregs_context_restore(get_fpregs_ctx(cm_get_context(NON_SECURE)));
+#endif
+
 	return rc;
 }