Privileges to enable a non-DBA user to generate AWR report

The following privileges seem working for the stated purpose:

GRANT SELECT ON SYS.V_$DATABASE TO xxx
/
GRANT SELECT ON SYS.V_$INSTANCE TO xxx
/
GRANT EXECUTE ON SYS.DBMS_WORKLOAD_REPOSITORY TO xxx
/
GRANT SELECT ON SYS.DBA_HIST_DATABASE_INSTANCE TO xxx
/
GRANT SELECT ON SYS.DBA_HIST_SNAPSHOT TO xxx
/
GRANT ADVISOR TO xxx
/