fio_perf: add allow_direct_io option for RHEL8.8 and later

From RHEL8.8, virtiofsd support allow_direct_io option.

Signed-off-by: Xiaoling Gao <[email protected]>

qemu/tests/cfg/fio_perf.cfg

@@ -94,10 +94,14 @@
             fio_options = "--rw=%s --bs=%s --iodepth=%s --runtime=1m --direct=1 --filename=${fs_dest}/%s --name=job1 --ioengine=libaio --thread --group_reporting --numjobs=%s --size=512MB --time_based --output=${guest_result_file} &> /dev/null"
             order_list = "Block_size Iodepth Threads BW(MB/S) IOPS Latency(ms) Host_CPU BW/CPU KVM_Exits"
             fs_binary_extra_options = " --thread-pool-size=32"
-            !Host_RHEL.m8:
+            Host_RHEL.m9:
                 # The below option isn't supported on RHEL8.
                 fs_binary_extra_options += " --allow-direct-io"
                 vfsd_ver_chk_cmd = "rpm -q virtiofsd"
+            Host_RHEL.m8:
+                no Host_RHEL.m8.u0 Host_RHEL.m8.u1 Host_RHEL.m8.u2 Host_RHEL.m8.u3 Host_RHEL.m8.u4 Host_RHEL.m8.u5
+                no Host_RHEL.m8.u6 Host_RHEL.m8.u7
+                fs_binary_extra_options += " -o allow_direct_io"
             variants:
                 - auto:
                     fs_binary_extra_options += " -o cache=auto"