diff --git a/perl-xCAT/xCAT/DHCP/BootPolicy.pm b/perl-xCAT/xCAT/DHCP/BootPolicy.pm
index c4c348da1..2fb5fe612 100644
--- a/perl-xCAT/xCAT/DHCP/BootPolicy.pm
+++ b/perl-xCAT/xCAT/DHCP/BootPolicy.pm
@@ -112,43 +112,22 @@ sub kea_s390x_network_classes {
 
     my $network_id = "$opts{net}_$opts{prefix}";
     my $safe_network = $network_id;
-    $safe_network =~ s{[^[:alnum:]_.-]}{_}gxms;
+    $safe_network =~ s{[^A-Za-z0-9_.-]}{_}gxms;
 
-    my @classes;
-    if ( $opts{qemu_config_present} ) {
-        push @classes, {
+    return [
+        {
             name            => "xcat-s390x-qemu-$safe_network",
             test            => 'option[93].hex == 0x001f',
             additional_only => 1,
             'option-data'   => [
                 {
                     name          => 'conf-file',
-                    data          => $network_id,
-                    'always-send' => 1,
-                },
-                {
-                    name          => 'path-prefix',
-                    data          => 'pxelinux.cfg/s390x/',
+                    data          => "pxelinux.cfg/s390x/$network_id",
                     'always-send' => 1,
                 },
             ],
-        };
-    }
-    return \@classes;
-}
-
-sub ensure_isc_path_prefix_definition {
-    my ($class, $config) = @_;
-
-    foreach my $line ( @{$config} ) {
-        if ( $line =~ m{^\s* option \s+ path-prefix \s+ code \s+ 210\b}xms ) {
-            return 0;
-        }
-    }
-
-    my $index = @{$config} && $config->[0] =~ m{^\#xCAT}xms ? 1 : 0;
-    splice @{$config}, $index, 0, "option path-prefix code 210 = text;\n";
-    return 1;
+        },
+    ];
 }
 
 sub isc_client_architecture_lines {
@@ -184,11 +163,8 @@ sub isc_client_architecture_lines {
         "    } else if option client-architecture = 00:1c { #riscv64 uefi http boot\n ",
         "      option vendor-class-identifier \"HTTPClient\";\n",
         "      filename \"http://$tftp$portsuffix/tftpboot/boot/grub2/grub2.riscv64\";\n",
-        ($opts{s390x_qemu_config_present} ? (
-            "    } else if option client-architecture = 00:1f { #QEMU s390x\n ",
-            "      option path-prefix = \"pxelinux.cfg/s390x/\";\n",
-            "      option conf-file = \"${net}_${maskbits}\";\n",
-        ) : ()),
+        "    } else if option client-architecture = 00:1f { #QEMU s390x\n ",
+        "      option conf-file = \"pxelinux.cfg/s390x/${net}_${maskbits}\";\n",
         "    } else if option client-architecture = 00:0e { #OPAL-v3\n ",
         "        option conf-file = \"http://$tftp$portsuffix/tftpboot/pxelinux.cfg/p/${net}_${maskbits}\";\n",
         "    } else if substring (option vendor-class-identifier,0,11) = \"onie_vendor\" { #for onie on cumulus switch\n",
diff --git a/xCAT-server/lib/xcat/plugins/dhcp.pm b/xCAT-server/lib/xcat/plugins/dhcp.pm
index 235f43032..d4a15af75 100644
--- a/xCAT-server/lib/xcat/plugins/dhcp.pm
+++ b/xCAT-server/lib/xcat/plugins/dhcp.pm
@@ -2354,10 +2354,6 @@ sub process_request
         $restartdhcp = 1;
         newconfig();
     }
-    if (!xCAT::Utils->isAIX() &&
-        xCAT::DHCP::BootPolicy->ensure_isc_path_prefix_definition(\@dhcpconf)) {
-        $restartdhcp = 1;
-    }
     if ($usingipv6 and not $dhcp6conf[0]) {
         $restartdhcp6 = 1;
         newconfig6();
@@ -3368,9 +3364,8 @@ sub kea_subnet4_intent
       };
     push @client_classes, @{
         xCAT::DHCP::BootPolicy->kea_s390x_network_classes(
-            net                 => $net,
-            prefix              => $prefix,
-            qemu_config_present => -f "$tftpdir/pxelinux.cfg/s390x/${net}_${prefix}",
+            net    => $net,
+            prefix => $prefix,
         )
       };
     if (@client_classes) {
@@ -3896,7 +3891,6 @@ sub kea_option_defs
 {
     return [
         { name => 'conf-file', code => 209, type => 'string', space => 'dhcp4' },
-        { name => 'path-prefix', code => 210, type => 'string', space => 'dhcp4' },
         { name => 'iscsi-initiator-iqn', code => 203, type => 'string', space => 'dhcp4' },
         { name => 'cumulus-provision-url', code => 239, type => 'string', space => 'dhcp4' },
     ];
@@ -4535,8 +4529,6 @@ sub addnet
                 tftpdir     => $tftpdir,
                 net         => $net,
                 prefix      => $maskbits,
-                s390x_qemu_config_present =>
-                  -f "$tftpdir/pxelinux.cfg/s390x/${net}_${maskbits}",
             ) };
 
         if ($range) {
@@ -4806,7 +4798,6 @@ sub newconfig
     push @dhcpconf, "#xCAT generated dhcp configuration\n";
     push @dhcpconf, "\n";
     push @dhcpconf, "option conf-file code 209 = text;\n";
-    push @dhcpconf, "option path-prefix code 210 = text;\n";
     push @dhcpconf, "option space isan;\n";
     push @dhcpconf, "option isan-encap-opts code 43 = encapsulate isan;\n";
     push @dhcpconf, "option isan.iqn code 203 = string;\n";
diff --git a/xCAT-server/lib/xcat/plugins/mknb.pm b/xCAT-server/lib/xcat/plugins/mknb.pm
index 3c1e8ba86..9a6c7fbcd 100644
--- a/xCAT-server/lib/xcat/plugins/mknb.pm
+++ b/xCAT-server/lib/xcat/plugins/mknb.pm
@@ -757,8 +757,7 @@ sub process_request {
         my $nicip = $normnets->{$net};
         my $xcatd_address = defined($xcatdnormnets->{$net}) ? $xcatdnormnets->{$net} : $nicip;
         $net =~ s/\//_/;
-        if (defined $nobootnicips{$nicip}
-            || ($arch eq 's390x' && defined $nobootnicips{$xcatd_address})) {
+        if (defined($nobootnicips{$nicip})) {
             if ($arch =~ /ppc/ and -r "$tftpdir/pxelinux.cfg/p/$net") {
                 unlink("$tftpdir/pxelinux.cfg/p/$net");
             } elsif ($arch eq 's390x') {
@@ -834,6 +833,9 @@ sub process_request {
                 xcatd_address  => $xcatd_address,
                 xcatdport      => $xcatdport,
                 consolecmdline => $consolecmdline,
+                kernel         => $invisibletouch
+                  ? "xcat/genesis.kernel.$arch"
+                  : "xcat/nbk.$arch",
                 initrd         => $initrd_file,
             );
             if ($config_error) {
@@ -923,7 +925,7 @@ sub _write_s390x_discovery_config {
     my $qemu_config = "# pxelinux.cfg xCAT Genesis s390x\n"
       . "DEFAULT xCAT\n"
       . "LABEL xCAT\n"
-      . "  KERNEL xcat/genesis.kernel.s390x\n"
+      . "  KERNEL $args{kernel}\n"
       . "  INITRD $initrd\n"
       . "  APPEND $cmdline\n";
     my $error = _write_s390x_config($qemu_path, $qemu_config);