sim: Move the MemPools object out of System and into SEWorkload.

This removes the need for all the FullSystem checks in the System class,
and simplifies that class in general.

Change-Id: Ie8a3bc67db9195027d2111009b15ca59221bdeb2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/50348
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

util/cpt_upgraders/mempool-to-seworkload.py

@@ -0,0 +1,32 @@
+# This upgrader moves memory pools from the system object to the SE workload
+# object.
+def upgrader(cpt):
+    systems = {}
+
+    # Find sections with 'num_mem_pools' options, and assume those are system
+    # objects which host MemPools.
+    for sec in cpt.sections():
+        num_mem_pools = cpt.get(sec, 'num_mem_pools', fallback=None)
+        if num_mem_pools is not None:
+            systems[sec] = num_mem_pools
+
+    for sec, num_mem_pools in systems.items():
+        # Transfer num_mem_pools to the new location.
+        cpt.remove_option(sec, 'num_mem_pools')
+        cpt.set(f'{sec}.workload', 'num_mem_pools', num_mem_pools)
+
+        for idx in range(int(num_mem_pools)):
+            old_name = f'{sec}.memPool{idx}'
+            new_name = f'{sec}.workload.memPool{idx}'
+
+            # Create the new section.
+            cpt.add_section(new_name)
+
+            # Copy items from the old section into it.
+            for item in cpt.items(old_name):
+                cpt.set(new_name, *item)
+
+            # Delete the old section.
+            cpt.remove_section(old_name)
+
+depends = 'mempool-sections'