Merge tag 'kvmarm-fixes-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm64 fixes for 5.13, take #1

- Fix regression with irqbypass not restarting the guest on failed connect
- Fix regression with debug register decoding resulting in overlapping access
- Commit exception state on exit to usrspace
- Fix the MMU notifier return values
- Add missing 'static' qualifiers in the new host stage-2 code

18 files changed, 1200 insertions, 304 deletions

diff --git a/tools/testing/ktest/examples/vmware.conf b/tools/testing/ktest/examples/vmware.conf
new file mode 100644
index 000000000000..61958163d242
--- /dev/null
+++ b/tools/testing/ktest/examples/vmware.conf
@@ -0,0 +1,137 @@
+#
+# This config is an example usage of ktest.pl with a vmware guest
+#
+# VMware Setup:
+# -------------
+# - Edit the Virtual Machine ("Edit virtual machine settings")
+# - Add a Serial Port
+#   - You almost certainly want it set "Connect at power on"
+#   - Select "Use socket (named pipe)"
+#   - Select a name that you'll recognize, like 'ktestserialpipe'
+#   - From: Server
+#   - To: A Virtual Machine
+#   - Save
+# - Make sure you note the name, it will be in the base directory of the
+#   virtual machine (where the "disks" are stored.  The default
+#   is /var/lib/vmware/<virtual machine name>/<the name you entered above>
+#
+# - Make note of the path to the VM
+# </End VMware setup>
+#
+# The guest is called 'Guest' and this would be something that
+# could be run on the host to test a virtual machine target.
+
+MACHINE = Guest
+
+# Name of the serial pipe you set in the VMware settings
+VMWARE_SERIAL_NAME = <the name you entered above>
+
+# Define a variable of the name of the VM
+# Noting this needs to be the name of the kmx file, and usually, the
+# name of the directory that it's in.  If the directory and name
+# differ change the VMWARE_VM_DIR accordingly.
+# Please ommit the .kmx extension
+VMWARE_VM_NAME = <virtual machine name>
+
+# VM dir name.  This is usually the same as the virtual machine's name,
+# but not always the case.  Change if they differ
+VMWARE_VM_DIR = ${VMWARE_VM_NAME}
+
+# Base directory that the Virtual machine is contained in
+# /var/lib/vmware is the default on Linux
+VMWARE_VM_BASE_DIR = /var/lib/vmware/${VMWARE_VM_DIR}
+
+# Use ncat to read the unix pipe.  Anything that can read the Unix Pipe
+# and output it's contents to stdout will work
+CONSOLE = /usr/bin/ncat -U ${VMWARE_VM_BASE_DIR}/${VMWARE_SERIAL_NAME}
+
+# Define what version of Workstation you are using
+# This is used by vmrun to use the appropriate appripriate pieces to 
+# test this.  In all likelihood you want 'ws' or 'player' 
+# Valid options:
+# 	ws - Workstation (Windows or Linux host)
+# 	fusion - Fusion (Mac host)
+# 	player - Using VMware Player (Windows or Linux host)
+# Note: vmrun has to run directly on the host machine
+VMWARE_HOST_TYPE = ws
+
+# VMware provides `vmrun` to allow you to do certain things to the virtual machine
+# This should hard reset the VM and force a boot
+VMWARE_POWER_CYCLE = /usr/bin/vmrun -T ${VMWARE_HOST_TYPE} reset ${VMWARE_VM_BASE_DIR}/${VMWARE_VM_NAME}.kmx nogui
+
+#*************************************#
+# This part is the same as test.conf  #
+#*************************************#
+
+# The include files will set up the type of test to run. Just set TEST to
+# which test you want to run.
+#
+# TESTS = patchcheck, randconfig, boot, test, config-bisect, bisect, min-config
+#
+# See the include/*.conf files that define these tests
+#
+TEST := patchcheck
+
+# Some tests may have more than one test to run. Define MULTI := 1 to run
+# the extra tests.
+MULTI := 0
+
+# In case you want to differentiate which type of system you are testing
+BITS := 64
+
+# REBOOT = none, error, fail, empty
+#  See include/defaults.conf
+REBOOT := empty
+
+
+# The defaults file will set up various settings that can be used by all
+# machine configs.
+INCLUDE include/defaults.conf
+
+
+#*************************************#
+# Now we are different from test.conf #
+#*************************************#
+
+
+# The example here assumes that Guest is running a Fedora release
+# that uses dracut for its initfs. The POST_INSTALL will be executed
+# after the install of the kernel and modules are complete.
+#
+POST_INSTALL = ${SSH} /sbin/dracut -f /boot/initramfs-test.img $KERNEL_VERSION
+
+# Guests sometimes get stuck on reboot. We wait 3 seconds after running
+# the reboot command and then  do a full power-cycle of the guest.
+# This forces the guest to restart.
+#
+POWERCYCLE_AFTER_REBOOT = 3
+
+# We do the same after the halt command, but this time we wait 20 seconds.
+POWEROFF_AFTER_HALT = 20
+
+
+# As the defaults.conf file has a POWER_CYCLE option already defined,
+# and options can not be defined in the same section more than once
+# (all DEFAULTS sections are considered the same). We use the
+# DEFAULTS OVERRIDE to tell ktest.pl to ignore the previous defined
+# options, for the options set in the OVERRIDE section.
+#
+DEFAULTS OVERRIDE
+
+# Instead of using the default POWER_CYCLE option defined in
+# defaults.conf, we use virsh to cycle it. To do so, we destroy
+# the guest, wait 5 seconds, and then start it up again.
+# Crude, but effective.
+#
+POWER_CYCLE = ${VMWARE_POWER_CYCLE}
+
+
+DEFAULTS
+
+# The following files each handle a different test case.
+# Having them included allows you to set up more than one machine and share
+# the same tests.
+INCLUDE include/patchcheck.conf
+INCLUDE include/tests.conf
+INCLUDE include/bisect.conf
+INCLUDE include/min-config.conf
diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 4e2450964517..09d1578f9d66 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -24,7 +24,7 @@ my %evals;
 
 #default opts
 my %default = (
-    "MAILER"			=> "sendmail",  # default mailer
+    "MAILER"			=> "sendmail",	# default mailer
     "EMAIL_ON_ERROR"		=> 1,
     "EMAIL_WHEN_FINISHED"	=> 1,
     "EMAIL_WHEN_CANCELED"	=> 0,
@@ -36,15 +36,15 @@ my %default = (
     "CLOSE_CONSOLE_SIGNAL"	=> "INT",
     "TIMEOUT"			=> 120,
     "TMP_DIR"			=> "/tmp/ktest/\${MACHINE}",
-    "SLEEP_TIME"		=> 60,	# sleep time between tests
+    "SLEEP_TIME"		=> 60,		# sleep time between tests
     "BUILD_NOCLEAN"		=> 0,
     "REBOOT_ON_ERROR"		=> 0,
     "POWEROFF_ON_ERROR"		=> 0,
     "REBOOT_ON_SUCCESS"		=> 1,
     "POWEROFF_ON_SUCCESS"	=> 0,
     "BUILD_OPTIONS"		=> "",
-    "BISECT_SLEEP_TIME"		=> 60,   # sleep time between bisects
-    "PATCHCHECK_SLEEP_TIME"	=> 60, # sleep time between patch checks
+    "BISECT_SLEEP_TIME"		=> 60,		# sleep time between bisects
+    "PATCHCHECK_SLEEP_TIME"	=> 60, 		# sleep time between patch checks
     "CLEAR_LOG"			=> 0,
     "BISECT_MANUAL"		=> 0,
     "BISECT_SKIP"		=> 1,
@@ -512,6 +512,69 @@ $config_help{"REBOOT_SCRIPT"} = << "EOF"
 EOF
     ;
 
+# used with process_expression()
+my $d = 0;
+
+# defined before get_test_name()
+my $in_die = 0;
+
+# defined before process_warning_line()
+my $check_build_re = ".*:.*(warning|error|Error):.*";
+my $utf8_quote = "\\x{e2}\\x{80}(\\x{98}|\\x{99})";
+
+# defined before child_finished()
+my $child_done;
+
+# config_ignore holds the configs that were set (or unset) for
+# a good config and we will ignore these configs for the rest
+# of a config bisect. These configs stay as they were.
+my %config_ignore;
+
+# config_set holds what all configs were set as.
+my %config_set;
+
+# config_off holds the set of configs that the bad config had disabled.
+# We need to record them and set them in the .config when running
+# olddefconfig, because olddefconfig keeps the defaults.
+my %config_off;
+
+# config_off_tmp holds a set of configs to turn off for now
+my @config_off_tmp;
+
+# config_list is the set of configs that are being tested
+my %config_list;
+my %null_config;
+
+my %dependency;
+
+# found above run_config_bisect()
+my $pass = 1;
+
+# found above add_dep()
+
+my %depends;
+my %depcount;
+my $iflevel = 0;
+my @ifdeps;
+
+# prevent recursion
+my %read_kconfigs;
+
+# found above test_this_config()
+my %min_configs;
+my %keep_configs;
+my %save_configs;
+my %processed_configs;
+my %nochange_config;
+
+#
+# These are first defined here, main function later on
+#
+sub run_command;
+sub start_monitor;
+sub end_monitor;
+sub wait_for_monitor;
+
 sub _logit {
     if (defined($opt{"LOG_FILE"})) {
 	print LOG @_;
@@ -537,7 +600,7 @@ sub read_prompt {
     my $ans;
 
     for (;;) {
-	if ($cancel) {
+        if ($cancel) {
 	    print "$prompt [y/n/C] ";
 	} else {
 	    print "$prompt [Y/n] ";
@@ -760,7 +823,7 @@ sub process_variables {
     # remove the space added in the beginning
     $retval =~ s/ //;
 
-    return "$retval"
+    return "$retval";
 }
 
 sub set_value {
@@ -863,7 +926,6 @@ sub value_defined {
 	defined($opt{$2});
 }
 
-my $d = 0;
 sub process_expression {
     my ($name, $val) = @_;
 
@@ -978,7 +1040,6 @@ sub __read_config {
 	    $override = 0;
 
 	    if ($type eq "TEST_START") {
-
 		if ($num_tests_set) {
 		    die "$name: $.: Can not specify both NUM_TESTS and TEST_START\n";
 		}
@@ -1048,7 +1109,6 @@ sub __read_config {
 		$test_num = $old_test_num;
 		$repeat = $old_repeat;
 	    }
-
 	} elsif (/^\s*ELSE\b(.*)$/) {
 	    if (!$if) {
 		die "$name: $.: ELSE found with out matching IF section\n$_";
@@ -1095,7 +1155,7 @@ sub __read_config {
 		    }
 		}
 	    }
-		
+
 	    if ( ! -r $file ) {
 		die "$name: $.: Can't read file $file\n$_";
 	    }
@@ -1186,13 +1246,13 @@ sub __read_config {
 }
 
 sub get_test_case {
-	print "What test case would you like to run?\n";
-	print " (build, install or boot)\n";
-	print " Other tests are available but require editing ktest.conf\n";
-	print " (see tools/testing/ktest/sample.conf)\n";
-	my $ans = <STDIN>;
-	chomp $ans;
-	$default{"TEST_TYPE"} = $ans;
+    print "What test case would you like to run?\n";
+    print " (build, install or boot)\n";
+    print " Other tests are available but require editing ktest.conf\n";
+    print " (see tools/testing/ktest/sample.conf)\n";
+    my $ans = <STDIN>;
+    chomp $ans;
+    $default{"TEST_TYPE"} = $ans;
 }
 
 sub read_config {
@@ -1368,11 +1428,6 @@ sub eval_option {
     return $option;
 }
 
-sub run_command;
-sub start_monitor;
-sub end_monitor;
-sub wait_for_monitor;
-
 sub reboot {
     my ($time) = @_;
     my $powercycle = 0;
@@ -1457,8 +1512,6 @@ sub do_not_reboot {
 	($test_type eq "config_bisect" && $opt{"CONFIG_BISECT_TYPE[$i]"} eq "build");
 }
 
-my $in_die = 0;
-
 sub get_test_name() {
     my $name;
 
@@ -1471,7 +1524,6 @@ sub get_test_name() {
 }
 
 sub dodie {
-
     # avoid recursion
     return if ($in_die);
     $in_die = 1;
@@ -1481,10 +1533,8 @@ sub dodie {
     doprint "CRITICAL FAILURE... [TEST $i] ", @_, "\n";
 
     if ($reboot_on_error && !do_not_reboot) {
-
 	doprint "REBOOTING\n";
 	reboot_to_good;
-
     } elsif ($poweroff_on_error && defined($power_off)) {
 	doprint "POWERING OFF\n";
 	`$power_off`;
@@ -1519,13 +1569,14 @@ sub dodie {
 	    close O;
 	    close L;
 	}
-        send_email("KTEST: critical failure for test $i [$name]",
-                "Your test started at $script_start_time has failed with:\n@_\n", $log_file);
+
+	send_email("KTEST: critical failure for test $i [$name]",
+		"Your test started at $script_start_time has failed with:\n@_\n", $log_file);
     }
 
     if ($monitor_cnt) {
-	    # restore terminal settings
-	    system("stty $stty_orig");
+	# restore terminal settings
+	system("stty $stty_orig");
     }
 
     if (defined($post_test)) {
@@ -1709,81 +1760,81 @@ sub wait_for_monitor {
 }
 
 sub save_logs {
-	my ($result, $basedir) = @_;
-	my @t = localtime;
-	my $date = sprintf "%04d%02d%02d%02d%02d%02d",
-		1900+$t[5],$t[4],$t[3],$t[2],$t[1],$t[0];
+    my ($result, $basedir) = @_;
+    my @t = localtime;
+    my $date = sprintf "%04d%02d%02d%02d%02d%02d",
+	1900+$t[5],$t[4],$t[3],$t[2],$t[1],$t[0];
 
-	my $type = $build_type;
-	if ($type =~ /useconfig/) {
-	    $type = "useconfig";
-	}
+    my $type = $build_type;
+    if ($type =~ /useconfig/) {
+	$type = "useconfig";
+    }
 
-	my $dir = "$machine-$test_type-$type-$result-$date";
+    my $dir = "$machine-$test_type-$type-$result-$date";
 
-	$dir = "$basedir/$dir";
+    $dir = "$basedir/$dir";
 
-	if (!-d $dir) {
-	    mkpath($dir) or
-		dodie "can't create $dir";
-	}
+    if (!-d $dir) {
+	mkpath($dir) or
+	    dodie "can't create $dir";
+    }
 
-	my %files = (
-		"config" => $output_config,
-		"buildlog" => $buildlog,
-		"dmesg" => $dmesg,
-		"testlog" => $testlog,
-	);
+    my %files = (
+	"config" => $output_config,
+	"buildlog" => $buildlog,
+	"dmesg" => $dmesg,
+	"testlog" => $testlog,
+    );
 
-	while (my ($name, $source) = each(%files)) {
-		if (-f "$source") {
-			cp "$source", "$dir/$name" or
-				dodie "failed to copy $source";
-		}
+    while (my ($name, $source) = each(%files)) {
+	if (-f "$source") {
+	    cp "$source", "$dir/$name" or
+		dodie "failed to copy $source";
 	}
+    }
 
-	doprint "*** Saved info to $dir ***\n";
+    doprint "*** Saved info to $dir ***\n";
 }
 
 sub fail {
 
-	if ($die_on_failure) {
-		dodie @_;
-	}
+    if ($die_on_failure) {
+	dodie @_;
+    }
 
-	doprint "FAILED\n";
+    doprint "FAILED\n";
 
-	my $i = $iteration;
+    my $i = $iteration;
 
-	# no need to reboot for just building.
-	if (!do_not_reboot) {
-	    doprint "REBOOTING\n";
-	    reboot_to_good $sleep_time;
-	}
+    # no need to reboot for just building.
+    if (!do_not_reboot) {
+	doprint "REBOOTING\n";
+	reboot_to_good $sleep_time;
+    }
 
-	my $name = "";
+    my $name = "";
 
-	if (defined($test_name)) {
-	    $name = " ($test_name)";
-	}
+    if (defined($test_name)) {
+	$name = " ($test_name)";
+    }
 
-	print_times;
+    print_times;
 
-	doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
-	doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
-	doprint "KTEST RESULT: TEST $i$name Failed: ", @_, "\n";
-	doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
-	doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
+    doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
+    doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
+    doprint "KTEST RESULT: TEST $i$name Failed: ", @_, "\n";
+    doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
+    doprint "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%\n";
 
-	if (defined($store_failures)) {
-	    save_logs "fail", $store_failures;
-        }
+    if (defined($store_failures)) {
+	save_logs "fail", $store_failures;
+    }
 
-	if (defined($post_test)) {
-		run_command $post_test;
-	}
+    if (defined($post_test)) {
+	run_command $post_test;
+    }
 
-	return 1;
+    return 1;
 }
 
 sub run_command {
@@ -1915,8 +1966,8 @@ sub _get_grub_index {
     my ($command, $target, $skip) = @_;
 
     return if (defined($grub_number) && defined($last_grub_menu) &&
-	       $last_grub_menu eq $grub_menu && defined($last_machine) &&
-	       $last_machine eq $machine);
+	$last_grub_menu eq $grub_menu && defined($last_machine) &&
+	$last_machine eq $machine);
 
     doprint "Find $reboot_type menu ... ";
     $grub_number = -1;
@@ -1924,8 +1975,8 @@ sub _get_grub_index {
     my $ssh_grub = $ssh_exec;
     $ssh_grub =~ s,\$SSH_COMMAND,$command,g;
 
-    open(IN, "$ssh_grub |")
-	or dodie "unable to execute $command";
+    open(IN, "$ssh_grub |") or
+	dodie "unable to execute $command";
 
     my $found = 0;
 
@@ -1969,9 +2020,9 @@ sub get_grub_index {
 	$target = '^menuentry.*' . $grub_menu_qt;
 	$skip = '^menuentry\s|^submenu\s';
     } elsif ($reboot_type eq "grub2bls") {
-        $command = $grub_bls_get;
-        $target = '^title=.*' . $grub_menu_qt;
-        $skip = '^title=';
+	$command = $grub_bls_get;
+	$target = '^title=.*' . $grub_menu_qt;
+	$skip = '^title=';
     } else {
 	return;
     }
@@ -1979,8 +2030,7 @@ sub get_grub_index {
     _get_grub_index($command, $target, $skip);
 }
 
-sub wait_for_input
-{
+sub wait_for_input {
     my ($fp, $time) = @_;
     my $start_time;
     my $rin;
@@ -2096,7 +2146,6 @@ sub monitor {
     my $version_found = 0;
 
     while (!$done) {
-
 	if ($bug && defined($stop_after_failure) &&
 	    $stop_after_failure >= 0) {
 	    my $time = $stop_after_failure - (time - $failure_start);
@@ -2349,9 +2398,6 @@ sub start_monitor_and_install {
     return monitor;
 }
 
-my $check_build_re = ".*:.*(warning|error|Error):.*";
-my $utf8_quote = "\\x{e2}\\x{80}(\\x{98}|\\x{99})";
-
 sub process_warning_line {
     my ($line) = @_;
 
@@ -2394,7 +2440,7 @@ sub check_buildlog {
 	while (<IN>) {
 	    if (/$check_build_re/) {
 		my $warning = process_warning_line $_;
-		
+
 		$warnings_list{$warning} = 1;
 	    }
 	}
@@ -2571,7 +2617,6 @@ sub build {
 	    run_command "mv $outputdir/config_temp $output_config" or
 		dodie "moving config_temp";
 	}
-
     } elsif (!$noclean) {
 	unlink "$output_config";
 	run_command "$make mrproper" or
@@ -2594,6 +2639,9 @@ sub build {
     # Run old config regardless, to enforce min configurations
     make_oldconfig;
 
+    if (not defined($build_options)){
+	$build_options = "";
+    }
     my $build_ret = run_command "$make $build_options", $buildlog;
 
     if (defined($post_build)) {
@@ -2649,14 +2697,15 @@ sub success {
 
     print_times;
 
-    doprint "\n\n*******************************************\n";
-    doprint     "*******************************************\n";
-    doprint     "KTEST RESULT: TEST $i$name SUCCESS!!!!         **\n";
-    doprint     "*******************************************\n";
-    doprint     "*******************************************\n";
+    doprint "\n\n";
+    doprint "*******************************************\n";
+    doprint "*******************************************\n";
+    doprint "KTEST RESULT: TEST $i$name SUCCESS!!!!   **\n";
+    doprint "*******************************************\n";
+    doprint "*******************************************\n";
 
     if (defined($store_successes)) {
-        save_logs "success", $store_successes;
+	save_logs "success", $store_successes;
     }
 
     if ($i != $opt{"NUM_TESTS"} && !do_not_reboot) {
@@ -2698,8 +2747,6 @@ sub child_run_test {
     exit $run_command_status;
 }
 
-my $child_done;
-
 sub child_finished {
     $child_done = 1;
 }
@@ -3031,7 +3078,6 @@ sub bisect {
     }
 
     if ($do_check) {
-
 	# get current HEAD
 	my $head = get_sha1("HEAD");
 
@@ -3071,13 +3117,11 @@ sub bisect {
 	run_command "git bisect replay $replay" or
 	    dodie "failed to run replay";
     } else {
-
 	run_command "git bisect good $good" or
 	    dodie "could not set bisect good to $good";
 
 	run_git_bisect "git bisect bad $bad" or
 	    dodie "could not set bisect bad to $bad";
-
     }
 
     if (defined($start)) {
@@ -3103,35 +3147,13 @@ sub bisect {
     success $i;
 }
 
-# config_ignore holds the configs that were set (or unset) for
-# a good config and we will ignore these configs for the rest
-# of a config bisect. These configs stay as they were.
-my %config_ignore;
-
-# config_set holds what all configs were set as.
-my %config_set;
-
-# config_off holds the set of configs that the bad config had disabled.
-# We need to record them and set them in the .config when running
-# olddefconfig, because olddefconfig keeps the defaults.
-my %config_off;
-
-# config_off_tmp holds a set of configs to turn off for now
-my @config_off_tmp;
-
-# config_list is the set of configs that are being tested
-my %config_list;
-my %null_config;
-
-my %dependency;
-
 sub assign_configs {
     my ($hash, $config) = @_;
 
     doprint "Reading configs from $config\n";
 
-    open (IN, $config)
-	or dodie "Failed to read $config";
+    open (IN, $config) or
+	dodie "Failed to read $config";
 
     while (<IN>) {
 	chomp;
@@ -3219,8 +3241,6 @@ sub config_bisect_end {
     doprint "***************************************\n\n";
 }
 
-my $pass = 1;
-
 sub run_config_bisect {
     my ($good, $bad, $last_result) = @_;
     my $reset = "";
@@ -3243,13 +3263,13 @@ sub run_config_bisect {
 
     $ret = run_config_bisect_test $config_bisect_type;
     if ($ret) {
-        doprint "NEW GOOD CONFIG ($pass)\n";
+	doprint "NEW GOOD CONFIG ($pass)\n";
 	system("cp $output_config $tmpdir/good_config.tmp.$pass");
 	$pass++;
 	# Return 3 for good config
 	return 3;
     } else {
-        doprint "NEW BAD CONFIG ($pass)\n";
+	doprint "NEW BAD CONFIG ($pass)\n";
 	system("cp $output_config $tmpdir/bad_config.tmp.$pass");
 	$pass++;
 	# Return 4 for bad config
@@ -3284,10 +3304,11 @@ sub config_bisect {
 
     if (!defined($config_bisect_exec)) {
 	# First check the location that ktest.pl ran
-	my @locations = ( "$pwd/config-bisect.pl",
-			  "$dirname/config-bisect.pl",
-			  "$builddir/tools/testing/ktest/config-bisect.pl",
-			  undef );
+	my @locations = (
+		"$pwd/config-bisect.pl",
+		"$dirname/config-bisect.pl",
+		"$builddir/tools/testing/ktest/config-bisect.pl",
+		undef );
 	foreach my $loc (@locations) {
 	    doprint "loc = $loc\n";
 	    $config_bisect_exec = $loc;
@@ -3368,7 +3389,7 @@ sub config_bisect {
     } while ($ret == 3 || $ret == 4);
 
     if ($ret == 2) {
-        config_bisect_end "$good_config.tmp", "$bad_config.tmp";
+	config_bisect_end "$good_config.tmp", "$bad_config.tmp";
     }
 
     return $ret if ($ret < 0);
@@ -3511,14 +3532,6 @@ sub patchcheck {
     return 1;
 }
 
-my %depends;
-my %depcount;
-my $iflevel = 0;
-my @ifdeps;
-
-# prevent recursion
-my %read_kconfigs;
-
 sub add_dep {
     # $config depends on $dep
     my ($config, $dep) = @_;
@@ -3548,7 +3561,6 @@ sub read_kconfig {
     my $cont = 0;
     my $line;
 
-
     if (! -f $kconfig) {
 	doprint "file $kconfig does not exist, skipping\n";
 	return;
@@ -3630,8 +3642,8 @@ sub read_kconfig {
 
 sub read_depends {
     # find out which arch this is by the kconfig file
-    open (IN, $output_config)
-	or dodie "Failed to read $output_config";
+    open (IN, $output_config) or
+	dodie "Failed to read $output_config";
     my $arch;
     while (<IN>) {
 	if (m,Linux/(\S+)\s+\S+\s+Kernel Configuration,) {
@@ -3657,7 +3669,7 @@ sub read_depends {
 
     if (! -f $kconfig && $arch =~ /\d$/) {
 	my $orig = $arch;
- 	# some subarchs have numbers, truncate them
+	# some subarchs have numbers, truncate them
 	$arch =~ s/\d*$//;
 	$kconfig = "$builddir/arch/$arch/Kconfig";
 	if (! -f $kconfig) {
@@ -3706,7 +3718,6 @@ sub get_depends {
     my @configs;
 
     while ($dep =~ /[$valid]/) {
-
 	if ($dep =~ /^[^$valid]*([$valid]+)/) {
 	    my $conf = "CONFIG_" . $1;
 
@@ -3721,12 +3732,6 @@ sub get_depends {
     return @configs;
 }
 
-my %min_configs;
-my %keep_configs;
-my %save_configs;
-my %processed_configs;
-my %nochange_config;
-
 sub test_this_config {
     my ($config) = @_;
 
@@ -3852,7 +3857,7 @@ sub make_min_config {
     foreach my $config (@config_keys) {
 	my $kconfig = chomp_config $config;
 	if (!defined $depcount{$kconfig}) {
-		$depcount{$kconfig} = 0;
+	    $depcount{$kconfig} = 0;
 	}
     }
 
@@ -3887,7 +3892,6 @@ sub make_min_config {
     my $take_two = 0;
 
     while (!$done) {
-
 	my $config;
 	my $found;
 
@@ -3898,7 +3902,7 @@ sub make_min_config {
 
 	# Sort keys by who is most dependent on
 	@test_configs = sort  { $depcount{chomp_config($b)} <=> $depcount{chomp_config($a)} }
-			  @test_configs ;
+	    @test_configs ;
 
 	# Put configs that did not modify the config at the end.
 	my $reset = 1;
@@ -3954,13 +3958,13 @@ sub make_min_config {
 	my $failed = 0;
 	build "oldconfig" or $failed = 1;
 	if (!$failed) {
-		start_monitor_and_install or $failed = 1;
+	    start_monitor_and_install or $failed = 1;
 
-		if ($type eq "test" && !$failed) {
-		    do_run_test or $failed = 1;
-		}
+	    if ($type eq "test" && !$failed) {
+		do_run_test or $failed = 1;
+	    }
 
-		end_monitor;
+	    end_monitor;
 	}
 
 	$in_bisect = 0;
@@ -3974,8 +3978,8 @@ sub make_min_config {
 
 	    # update new ignore configs
 	    if (defined($ignore_config)) {
-		open (OUT, ">$temp_config")
-		    or dodie "Can't write to $temp_config";
+		open (OUT, ">$temp_config") or
+		    dodie "Can't write to $temp_config";
 		foreach my $config (keys %save_configs) {
 		    print OUT "$save_configs{$config}\n";
 		}
@@ -4002,8 +4006,8 @@ sub make_min_config {
 	    }
 
 	    # Save off all the current mandatory configs
-	    open (OUT, ">$temp_config")
-		or dodie "Can't write to $temp_config";
+	    open (OUT, ">$temp_config") or
+		dodie "Can't write to $temp_config";
 	    foreach my $config (keys %keep_configs) {
 		print OUT "$keep_configs{$config}\n";
 	    }
@@ -4041,7 +4045,6 @@ sub make_warnings_file {
 
     open(IN, $buildlog) or dodie "Can't open $buildlog";
     while (<IN>) {
-
 	# Some compilers use UTF-8 extended for quotes
 	# for distcc heterogeneous systems, this causes issues
 	s/$utf8_quote/'/g;
@@ -4057,98 +4060,6 @@ sub make_warnings_file {
     success $i;
 }
 
-$#ARGV < 1 or die "ktest.pl version: $VERSION\n   usage: ktest.pl [config-file]\n";
-
-if ($#ARGV == 0) {
-    $ktest_config = $ARGV[0];
-    if (! -f $ktest_config) {
-	print "$ktest_config does not exist.\n";
-	if (!read_yn "Create it?") {
-	    exit 0;
-	}
-    }
-}
-
-if (! -f $ktest_config) {
-    $newconfig = 1;
-    get_test_case;
-    open(OUT, ">$ktest_config") or die "Can not create $ktest_config";
-    print OUT << "EOF"
-# Generated by ktest.pl
-#
-
-# PWD is a ktest.pl variable that will result in the process working
-# directory that ktest.pl is executed in.
-
-# THIS_DIR is automatically assigned the PWD of the path that generated
-# the config file. It is best to use this variable when assigning other
-# directory paths within this directory. This allows you to easily
-# move the test cases to other locations or to other machines.
-#
-THIS_DIR := $variable{"PWD"}
-
-# Define each test with TEST_START
-# The config options below it will override the defaults
-TEST_START
-TEST_TYPE = $default{"TEST_TYPE"}
-
-DEFAULTS
-EOF
-;
-    close(OUT);
-}
-read_config $ktest_config;
-
-if (defined($opt{"LOG_FILE"})) {
-    $opt{"LOG_FILE"} = eval_option("LOG_FILE", $opt{"LOG_FILE"}, -1);
-}
-
-# Append any configs entered in manually to the config file.
-my @new_configs = keys %entered_configs;
-if ($#new_configs >= 0) {
-    print "\nAppending entered in configs to $ktest_config\n";
-    open(OUT, ">>$ktest_config") or die "Can not append to $ktest_config";
-    foreach my $config (@new_configs) {
-	print OUT "$config = $entered_configs{$config}\n";
-	$opt{$config} = process_variables($entered_configs{$config});
-    }
-}
-
-if (defined($opt{"LOG_FILE"})) {
-    if ($opt{"CLEAR_LOG"}) {
-	unlink $opt{"LOG_FILE"};
-    }
-    open(LOG, ">> $opt{LOG_FILE}") or die "Can't write to $opt{LOG_FILE}";
-    LOG->autoflush(1);
-}
-
-doprint "\n\nSTARTING AUTOMATED TESTS\n\n";
-
-for (my $i = 0, my $repeat = 1; $i <= $opt{"NUM_TESTS"}; $i += $repeat) {
-
-    if (!$i) {
-	doprint "DEFAULT OPTIONS:\n";
-    } else {
-	doprint "\nTEST $i OPTIONS";
-	if (defined($repeat_tests{$i})) {
-	    $repeat = $repeat_tests{$i};
-	    doprint " ITERATE $repeat";
-	}
-	doprint "\n";
-    }
-
-    foreach my $option (sort keys %opt) {
-
-	if ($option =~ /\[(\d+)\]$/) {
-	    next if ($i != $1);
-	} else {
-	    next if ($i);
-	}
-
-	doprint "$option = $opt{$option}\n";
-    }
-}
-
 sub option_defined {
     my ($option) = @_;
 
@@ -4261,7 +4172,6 @@ sub do_send_mail {
 }
 
 sub send_email {
-
     if (defined($mailto)) {
 	if (!defined($mailer)) {
 	    doprint "No email sent: email or mailer not specified in config.\n";
@@ -4274,12 +4184,103 @@ sub send_email {
 sub cancel_test {
     if ($email_when_canceled) {
 	my $name = get_test_name;
-        send_email("KTEST: Your [$name] test was cancelled",
-                "Your test started at $script_start_time was cancelled: sig int");
+	send_email("KTEST: Your [$name] test was cancelled",
+	    "Your test started at $script_start_time was cancelled: sig int");
     }
     die "\nCaught Sig Int, test interrupted: $!\n"
 }
 
+$#ARGV < 1 or die "ktest.pl version: $VERSION\n   usage: ktest.pl [config-file]\n";
+
+if ($#ARGV == 0) {
+    $ktest_config = $ARGV[0];
+    if (! -f $ktest_config) {
+	print "$ktest_config does not exist.\n";
+	if (!read_yn "Create it?") {
+	    exit 0;
+	}
+    }
+}
+
+if (! -f $ktest_config) {
+    $newconfig = 1;
+    get_test_case;
+    open(OUT, ">$ktest_config") or die "Can not create $ktest_config";
+    print OUT << "EOF"
+# Generated by ktest.pl
+#
+
+# PWD is a ktest.pl variable that will result in the process working
+# directory that ktest.pl is executed in.
+
+# THIS_DIR is automatically assigned the PWD of the path that generated
+# the config file. It is best to use this variable when assigning other
+# directory paths within this directory. This allows you to easily
+# move the test cases to other locations or to other machines.
+#
+THIS_DIR := $variable{"PWD"}
+
+# Define each test with TEST_START
+# The config options below it will override the defaults
+TEST_START
+TEST_TYPE = $default{"TEST_TYPE"}
+
+DEFAULTS
+EOF
+;
+    close(OUT);
+}
+read_config $ktest_config;
+
+if (defined($opt{"LOG_FILE"})) {
+    $opt{"LOG_FILE"} = eval_option("LOG_FILE", $opt{"LOG_FILE"}, -1);
+}
+
+# Append any configs entered in manually to the config file.
+my @new_configs = keys %entered_configs;
+if ($#new_configs >= 0) {
+    print "\nAppending entered in configs to $ktest_config\n";
+    open(OUT, ">>$ktest_config") or die "Can not append to $ktest_config";
+    foreach my $config (@new_configs) {
+	print OUT "$config = $entered_configs{$config}\n";
+	$opt{$config} = process_variables($entered_configs{$config});
+    }
+}
+
+if (defined($opt{"LOG_FILE"})) {
+    if ($opt{"CLEAR_LOG"}) {
+	unlink $opt{"LOG_FILE"};
+    }
+    open(LOG, ">> $opt{LOG_FILE}") or die "Can't write to $opt{LOG_FILE}";
+    LOG->autoflush(1);
+}
+
+doprint "\n\nSTARTING AUTOMATED TESTS\n\n";
+
+for (my $i = 0, my $repeat = 1; $i <= $opt{"NUM_TESTS"}; $i += $repeat) {
+
+    if (!$i) {
+	doprint "DEFAULT OPTIONS:\n";
+    } else {
+	doprint "\nTEST $i OPTIONS";
+	if (defined($repeat_tests{$i})) {
+	    $repeat = $repeat_tests{$i};
+	    doprint " ITERATE $repeat";
+	}
+	doprint "\n";
+    }
+
+    foreach my $option (sort keys %opt) {
+	if ($option =~ /\[(\d+)\]$/) {
+	    next if ($i != $1);
+	} else {
+	    next if ($i);
+	}
+
+	doprint "$option = $opt{$option}\n";
+    }
+}
+
 $SIG{INT} = qw(cancel_test);
 
 # First we need to do is the builds
@@ -4323,15 +4324,15 @@ for (my $i = 1; $i <= $opt{"NUM_TESTS"}; $i++) {
 
     # The first test may override the PRE_KTEST option
     if ($i == 1) {
-        if (defined($pre_ktest)) {
-            doprint "\n";
-            run_command $pre_ktest;
-        }
-        if ($email_when_started) {
+	if (defined($pre_ktest)) {
+	    doprint "\n";
+	    run_command $pre_ktest;
+	}
+	if ($email_when_started) {
 	    my $name = get_test_name;
-            send_email("KTEST: Your [$name] test was started",
-                "Your test was started on $script_start_time");
-        }
+	    send_email("KTEST: Your [$name] test was started",
+		"Your test was started on $script_start_time");
+	}
     }
 
     # Any test can override the POST_KTEST option
@@ -4409,7 +4410,7 @@ for (my $i = 1; $i <= $opt{"NUM_TESTS"}; $i++) {
 	my $ret = run_command $pre_test;
 	if (!$ret && defined($pre_test_die) &&
 	    $pre_test_die) {
-	    dodie "failed to pre_test\n";
+		dodie "failed to pre_test\n";
 	}
     }
 
@@ -4503,12 +4504,11 @@ if ($opt{"POWEROFF_ON_SUCCESS"}) {
     run_command $switch_to_good;
 }
 
-
 doprint "\n    $successes of $opt{NUM_TESTS} tests were successful\n\n";
 
 if ($email_when_finished) {
     send_email("KTEST: Your test has finished!",
-            "$successes of $opt{NUM_TESTS} tests started at $script_start_time were successful!");
+	"$successes of $opt{NUM_TESTS} tests started at $script_start_time were successful!");
 }
 
 if (defined($opt{"LOG_FILE"})) {
@@ -4517,3 +4517,12 @@ if (defined($opt{"LOG_FILE"})) {
 }
 
 exit 0;
+
+##
+# The following are here to standardize tabs/spaces/etc across the most likely editors
+###
+
+# Local Variables:
+# mode: perl
+# End:
+# vim: softtabstop=4
diff --git a/tools/testing/selftests/bpf/prog_tests/snprintf.c b/tools/testing/selftests/bpf/prog_tests/snprintf.c
index a958c22aec75..dffbcaa1ec98 100644
--- a/tools/testing/selftests/bpf/prog_tests/snprintf.c
+++ b/tools/testing/selftests/bpf/prog_tests/snprintf.c
@@ -43,6 +43,8 @@ void test_snprintf_positive(void)
 	if (!ASSERT_OK_PTR(skel, "skel_open"))
 		return;
 
+	skel->bss->pid = getpid();
+
 	if (!ASSERT_OK(test_snprintf__attach(skel), "skel_attach"))
 		goto cleanup;
 
diff --git a/tools/testing/selftests/bpf/progs/test_snprintf.c b/tools/testing/selftests/bpf/progs/test_snprintf.c
index 951a0301c553..e35129bea0a0 100644
--- a/tools/testing/selftests/bpf/progs/test_snprintf.c
+++ b/tools/testing/selftests/bpf/progs/test_snprintf.c
@@ -5,6 +5,8 @@
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
+__u32 pid = 0;
+
 char num_out[64] = {};
 long num_ret = 0;
 
@@ -42,6 +44,9 @@ int handler(const void *ctx)
 	static const char str1[] = "str1";
 	static const char longstr[] = "longstr";
 
+	if ((int)bpf_get_current_pid_tgid() != pid)
+		return 0;
+
 	/* Integer types */
 	num_ret  = BPF_SNPRINTF(num_out, sizeof(num_out),
 				"%d %u %x %li %llu %lX",
diff --git a/tools/testing/selftests/dma/dma_map_benchmark.c b/tools/testing/selftests/dma/dma_map_benchmark.c
index fb23ce9617ea..485dff51bad2 100644
--- a/tools/testing/selftests/dma/dma_map_benchmark.c
+++ b/tools/testing/selftests/dma/dma_map_benchmark.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (C) 2020 Hisilicon Limited.
+ * Copyright (C) 2020 HiSilicon Limited.
  */
 
 #include <fcntl.h>
@@ -40,7 +40,8 @@ struct map_benchmark {
 	__u32 dma_bits; /* DMA addressing capability */
 	__u32 dma_dir; /* DMA data direction */
 	__u32 dma_trans_ns; /* time for DMA transmission in ns */
-	__u8 expansion[80];	/* For future use */
+	__u32 granule; /* how many PAGE_SIZE will do map/unmap once a time */
+	__u8 expansion[76];	/* For future use */
 };
 
 int main(int argc, char **argv)
@@ -51,11 +52,13 @@ int main(int argc, char **argv)
 	int threads = 1, seconds = 20, node = -1;
 	/* default dma mask 32bit, bidirectional DMA */
 	int bits = 32, xdelay = 0, dir = DMA_MAP_BIDIRECTIONAL;
+	/* default granule 1 PAGESIZE */
+	int granule = 1;
 
 	int cmd = DMA_MAP_BENCHMARK;
 	char *p;
 
-	while ((opt = getopt(argc, argv, "t:s:n:b:d:x:")) != -1) {
+	while ((opt = getopt(argc, argv, "t:s:n:b:d:x:g:")) != -1) {
 		switch (opt) {
 		case 't':
 			threads = atoi(optarg);
@@ -75,6 +78,9 @@ int main(int argc, char **argv)
 		case 'x':
 			xdelay = atoi(optarg);
 			break;
+		case 'g':
+			granule = atoi(optarg);
+			break;
 		default:
 			return -1;
 		}
@@ -110,6 +116,11 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
+	if (granule < 1 || granule > 1024) {
+		fprintf(stderr, "invalid granule size\n");
+		exit(1);
+	}
+
 	fd = open("/sys/kernel/debug/dma_map_benchmark", O_RDWR);
 	if (fd == -1) {
 		perror("open");
@@ -123,14 +134,15 @@ int main(int argc, char **argv)
 	map.dma_bits = bits;
 	map.dma_dir = dir;
 	map.dma_trans_ns = xdelay;
+	map.granule = granule;
 
 	if (ioctl(fd, cmd, &map)) {
 		perror("ioctl");
 		exit(1);
 	}
 
-	printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s\n",
-			threads, seconds, node, dir[directions]);
+	printf("dma mapping benchmark: threads:%d seconds:%d node:%d dir:%s granule: %d\n",
+			threads, seconds, node, dir[directions], granule);
 	printf("average map latency(us):%.1f standard deviation:%.1f\n",
 			map.avg_map_100ns/10.0, map.map_stddev/10.0);
 	printf("average unmap latency(us):%.1f standard deviation:%.1f\n",
diff --git a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
index ad7fabd575f9..65ede506305c 100644
--- a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
+++ b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
@@ -3449,4 +3449,48 @@ TEST(epoll63)
 	close(sfd[1]);
 }
 
+/*
+ *        t0    t1
+ *     (ew) \  / (ew)
+ *           e0
+ *            | (lt)
+ *           s0
+ */
+TEST(epoll64)
+{
+	pthread_t waiter[2];
+	struct epoll_event e;
+	struct epoll_mtcontext ctx = { 0 };
+
+	signal(SIGUSR1, signal_handler);
+
+	ASSERT_EQ(socketpair(AF_UNIX, SOCK_STREAM, 0, ctx.sfd), 0);
+
+	ctx.efd[0] = epoll_create(1);
+	ASSERT_GE(ctx.efd[0], 0);
+
+	e.events = EPOLLIN;
+	ASSERT_EQ(epoll_ctl(ctx.efd[0], EPOLL_CTL_ADD, ctx.sfd[0], &e), 0);
+
+	/*
+	 * main will act as the emitter once both waiter threads are
+	 * blocked and expects to both be awoken upon the ready event.
+	 */
+	ctx.main = pthread_self();
+	ASSERT_EQ(pthread_create(&waiter[0], NULL, waiter_entry1a, &ctx), 0);
+	ASSERT_EQ(pthread_create(&waiter[1], NULL, waiter_entry1a, &ctx), 0);
+
+	usleep(100000);
+	ASSERT_EQ(write(ctx.sfd[1], "w", 1), 1);
+
+	ASSERT_EQ(pthread_join(waiter[0], NULL), 0);
+	ASSERT_EQ(pthread_join(waiter[1], NULL), 0);
+
+	EXPECT_EQ(ctx.count, 2);
+
+	close(ctx.efd[0]);
+	close(ctx.sfd[0]);
+	close(ctx.sfd[1]);
+}
+
 TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/kvm/lib/sparsebit.c b/tools/testing/selftests/kvm/lib/sparsebit.c
index 031ba3c932ed..a0d0c83d83de 100644
--- a/tools/testing/selftests/kvm/lib/sparsebit.c
+++ b/tools/testing/selftests/kvm/lib/sparsebit.c
@@ -1890,7 +1890,6 @@ void sparsebit_validate_internal(struct sparsebit *s)
  */
 
 #include <stdlib.h>
-#include <assert.h>
 
 struct range {
 	sparsebit_idx_t first, last;
diff --git a/tools/testing/selftests/mincore/mincore_selftest.c b/tools/testing/selftests/mincore/mincore_selftest.c
index 5a1e85ff5d32..e54106643337 100644
--- a/tools/testing/selftests/mincore/mincore_selftest.c
+++ b/tools/testing/selftests/mincore/mincore_selftest.c
@@ -14,7 +14,6 @@
 #include <sys/mman.h>
 #include <string.h>
 #include <fcntl.h>
-#include <string.h>
 
 #include "../kselftest.h"
 #include "../kselftest_harness.h"
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index 9236609731b1..3c4cb72ed8a4 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -274,7 +274,7 @@ check_mptcp_disabled()
 	ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0
 
 	local err=0
-	LANG=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
+	LC_ALL=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \
 		grep -q "^socket: Protocol not available$" && err=1
 	ip netns delete ${disabled_ns}
 
diff --git a/tools/testing/selftests/powerpc/mm/tlbie_test.c b/tools/testing/selftests/powerpc/mm/tlbie_test.c
index f85a0938ab25..48344a74b212 100644
--- a/tools/testing/selftests/powerpc/mm/tlbie_test.c
+++ b/tools/testing/selftests/powerpc/mm/tlbie_test.c
@@ -33,7 +33,6 @@
 #include <sched.h>
 #include <time.h>
 #include <stdarg.h>
-#include <sched.h>
 #include <pthread.h>
 #include <signal.h>
 #include <sys/prctl.h>
diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
index 8be8a03d2973..1054e40a499a 100644
--- a/tools/testing/selftests/proc/Makefile
+++ b/tools/testing/selftests/proc/Makefile
@@ -12,6 +12,7 @@ TEST_GEN_PROGS += proc-self-map-files-001
 TEST_GEN_PROGS += proc-self-map-files-002
 TEST_GEN_PROGS += proc-self-syscall
 TEST_GEN_PROGS += proc-self-wchan
+TEST_GEN_PROGS += proc-subset-pid
 TEST_GEN_PROGS += proc-uptime-001
 TEST_GEN_PROGS += proc-uptime-002
 TEST_GEN_PROGS += read
diff --git a/tools/testing/selftests/proc/proc-subset-pid.c b/tools/testing/selftests/proc/proc-subset-pid.c
new file mode 100644
index 000000000000..d1052bcab039
--- /dev/null
+++ b/tools/testing/selftests/proc/proc-subset-pid.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021 Alexey Dobriyan <adobriyan@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/*
+ * Test that "mount -t proc -o subset=pid" hides everything but pids,
+ * /proc/self and /proc/thread-self.
+ */
+#undef NDEBUG
+#include <assert.h>
+#include <errno.h>
+#include <sched.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mount.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <stdio.h>
+
+static inline bool streq(const char *a, const char *b)
+{
+	return strcmp(a, b) == 0;
+}
+
+static void make_private_proc(void)
+{
+	if (unshare(CLONE_NEWNS) == -1) {
+		if (errno == ENOSYS || errno == EPERM) {
+			exit(4);
+		}
+		exit(1);
+	}
+	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
+		exit(1);
+	}
+	if (mount(NULL, "/proc", "proc", 0, "subset=pid") == -1) {
+		exit(1);
+	}
+}
+
+static bool string_is_pid(const char *s)
+{
+	while (1) {
+		switch (*s++) {
+		case '0':case '1':case '2':case '3':case '4':
+		case '5':case '6':case '7':case '8':case '9':
+			continue;
+
+		case '\0':
+			return true;
+
+		default:
+			return false;
+		}
+	}
+}
+
+int main(void)
+{
+	make_private_proc();
+
+	DIR *d = opendir("/proc");
+	assert(d);
+
+	struct dirent *de;
+
+	bool dot = false;
+	bool dot_dot = false;
+	bool self = false;
+	bool thread_self = false;
+
+	while ((de = readdir(d))) {
+		if (streq(de->d_name, ".")) {
+			assert(!dot);
+			dot = true;
+			assert(de->d_type == DT_DIR);
+		} else if (streq(de->d_name, "..")) {
+			assert(!dot_dot);
+			dot_dot = true;
+			assert(de->d_type == DT_DIR);
+		} else if (streq(de->d_name, "self")) {
+			assert(!self);
+			self = true;
+			assert(de->d_type == DT_LNK);
+		} else if (streq(de->d_name, "thread-self")) {
+			assert(!thread_self);
+			thread_self = true;
+			assert(de->d_type == DT_LNK);
+		} else {
+			if (!string_is_pid(de->d_name)) {
+				fprintf(stderr, "d_name '%s'\n", de->d_name);
+				assert(0);
+			}
+			assert(de->d_type == DT_DIR);
+		}
+	}
+
+	char c;
+	int rv = readlink("/proc/cpuinfo", &c, 1);
+	assert(rv == -1 && errno == ENOENT);
+
+	int fd = open("/proc/cpuinfo", O_RDONLY);
+	assert(fd == -1 && errno == ENOENT);
+
+	return 0;
+}
diff --git a/tools/testing/selftests/proc/read.c b/tools/testing/selftests/proc/read.c
index b3ef9e14d6cc..35ee78dff144 100644
--- a/tools/testing/selftests/proc/read.c
+++ b/tools/testing/selftests/proc/read.c
@@ -14,7 +14,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 // Test
-// 1) read of every file in /proc
+// 1) read and lseek on every file in /proc
 // 2) readlink of every symlink in /proc
 // 3) recursively (1) + (2) for every directory in /proc
 // 4) write to /proc/*/clear_refs and /proc/*/task/*/clear_refs
@@ -45,6 +45,8 @@ static void f_reg(DIR *d, const char *filename)
 	fd = openat(dirfd(d), filename, O_RDONLY|O_NONBLOCK);
 	if (fd == -1)
 		return;
+	/* struct proc_ops::proc_lseek is mandatory if file is seekable. */
+	(void)lseek(fd, 0, SEEK_SET);
 	rv = read(fd, buf, sizeof(buf));
 	assert((0 <= rv && rv <= sizeof(buf)) || rv == -1);
 	close(fd);
diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index 9a35c3f6a557..1f651e85ed60 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -22,3 +22,4 @@ map_fixed_noreplace
 write_to_hugetlbfs
 hmm-tests
 local_config.*
+split_huge_page_test
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index 8b0cd421ebd3..73e1cc96d7c2 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -42,6 +42,7 @@ TEST_GEN_FILES += on-fault-limit
 TEST_GEN_FILES += thuge-gen
 TEST_GEN_FILES += transhuge-stress
 TEST_GEN_FILES += userfaultfd
+TEST_GEN_FILES += split_huge_page_test
 
 ifeq ($(MACHINE),x86_64)
 CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh $(CC) ../x86/trivial_32bit_program.c -m32)
diff --git a/tools/testing/selftests/vm/gup_test.c b/tools/testing/selftests/vm/gup_test.c
index 6c6336dd3b7f..1e662d59c502 100644
--- a/tools/testing/selftests/vm/gup_test.c
+++ b/tools/testing/selftests/vm/gup_test.c
@@ -13,6 +13,7 @@
 
 /* Just the flags we need, copied from mm.h: */
 #define FOLL_WRITE	0x01	/* check pte is writable */
+#define FOLL_TOUCH	0x02	/* mark page accessed */
 
 static char *cmd_to_str(unsigned long cmd)
 {
@@ -37,13 +38,13 @@ int main(int argc, char **argv)
 {
 	struct gup_test gup = { 0 };
 	unsigned long size = 128 * MB;
-	int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
+	int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 1;
 	unsigned long cmd = GUP_FAST_BENCHMARK;
-	int flags = MAP_PRIVATE;
+	int flags = MAP_PRIVATE, touch = 0;
 	char *file = "/dev/zero";
 	char *p;
 
-	while ((opt = getopt(argc, argv, "m:r:n:F:f:abctTLUuwSH")) != -1) {
+	while ((opt = getopt(argc, argv, "m:r:n:F:f:abctTLUuwWSHpz")) != -1) {
 		switch (opt) {
 		case 'a':
 			cmd = PIN_FAST_BENCHMARK;
@@ -65,9 +66,13 @@ int main(int argc, char **argv)
 			 */
 			gup.which_pages[0] = 1;
 			break;
+		case 'p':
+			/* works only with DUMP_USER_PAGES_TEST */
+			gup.test_flags |= GUP_TEST_FLAG_DUMP_PAGES_USE_PIN;
+			break;
 		case 'F':
 			/* strtol, so you can pass flags in hex form */
-			gup.flags = strtol(optarg, 0, 0);
+			gup.gup_flags = strtol(optarg, 0, 0);
 			break;
 		case 'm':
 			size = atoi(optarg) * MB;
@@ -93,6 +98,9 @@ int main(int argc, char **argv)
 		case 'w':
 			write = 1;
 			break;
+		case 'W':
+			write = 0;
+			break;
 		case 'f':
 			file = optarg;
 			break;
@@ -103,6 +111,10 @@ int main(int argc, char **argv)
 		case 'H':
 			flags |= (MAP_HUGETLB | MAP_ANONYMOUS);
 			break;
+		case 'z':
+			/* fault pages in gup, do not fault in userland */
+			touch = 1;
+			break;
 		default:
 			return -1;
 		}
@@ -140,7 +152,7 @@ int main(int argc, char **argv)
 
 	gup.nr_pages_per_call = nr_pages;
 	if (write)
-		gup.flags |= FOLL_WRITE;
+		gup.gup_flags |= FOLL_WRITE;
 
 	fd = open("/sys/kernel/debug/gup_test", O_RDWR);
 	if (fd == -1) {
@@ -160,8 +172,18 @@ int main(int argc, char **argv)
 	else if (thp == 0)
 		madvise(p, size, MADV_NOHUGEPAGE);
 
-	for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
-		p[0] = 0;
+	/*
+	 * FOLL_TOUCH, in gup_test, is used as an either/or case: either
+	 * fault pages in from the kernel via FOLL_TOUCH, or fault them
+	 * in here, from user space. This allows comparison of performance
+	 * between those two cases.
+	 */
+	if (touch) {
+		gup.gup_flags |= FOLL_TOUCH;
+	} else {
+		for (; (unsigned long)p < gup.addr + size; p += PAGE_SIZE)
+			p[0] = 0;
+	}
 
 	/* Only report timing information on the *_BENCHMARK commands: */
 	if ((cmd == PIN_FAST_BENCHMARK) || (cmd == GUP_FAST_BENCHMARK) ||
diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
new file mode 100644
index 000000000000..1af16d2c2a0a
--- /dev/null
+++ b/tools/testing/selftests/vm/split_huge_page_test.c
@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A test of splitting PMD THPs and PTE-mapped THPs from a specified virtual
+ * address range in a process via <debugfs>/split_huge_pages interface.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <malloc.h>
+#include <stdbool.h>
+
+uint64_t pagesize;
+unsigned int pageshift;
+uint64_t pmd_pagesize;
+
+#define PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size"
+#define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
+#define SMAP_PATH "/proc/self/smaps"
+#define INPUT_MAX 80
+
+#define PID_FMT "%d,0x%lx,0x%lx"
+#define PATH_FMT "%s,0x%lx,0x%lx"
+
+#define PFN_MASK     ((1UL<<55)-1)
+#define KPF_THP      (1UL<<22)
+
+int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file)
+{
+	uint64_t paddr;
+	uint64_t page_flags;
+
+	if (pagemap_file) {
+		pread(pagemap_file, &paddr, sizeof(paddr),
+			((long)vaddr >> pageshift) * sizeof(paddr));
+
+		if (kpageflags_file) {
+			pread(kpageflags_file, &page_flags, sizeof(page_flags),
+				(paddr & PFN_MASK) * sizeof(page_flags));
+
+			return !!(page_flags & KPF_THP);
+		}
+	}
+	return 0;
+}
+
+
+static uint64_t read_pmd_pagesize(void)
+{
+	int fd;
+	char buf[20];
+	ssize_t num_read;
+
+	fd = open(PMD_SIZE_PATH, O_RDONLY);
+	if (fd == -1) {
+		perror("Open hpage_pmd_size failed");
+		exit(EXIT_FAILURE);
+	}
+	num_read = read(fd, buf, 19);
+	if (num_read < 1) {
+		close(fd);
+		perror("Read hpage_pmd_size failed");
+		exit(EXIT_FAILURE);
+	}
+	buf[num_read] = '\0';
+	close(fd);
+
+	return strtoul(buf, NULL, 10);
+}
+
+static int write_file(const char *path, const char *buf, size_t buflen)
+{
+	int fd;
+	ssize_t numwritten;
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		return 0;
+
+	numwritten = write(fd, buf, buflen - 1);
+	close(fd);
+	if (numwritten < 1)
+		return 0;
+
+	return (unsigned int) numwritten;
+}
+
+static void write_debugfs(const char *fmt, ...)
+{
+	char input[INPUT_MAX];
+	int ret;
+	va_list argp;
+
+	va_start(argp, fmt);
+	ret = vsnprintf(input, INPUT_MAX, fmt, argp);
+	va_end(argp);
+
+	if (ret >= INPUT_MAX) {
+		printf("%s: Debugfs input is too long\n", __func__);
+		exit(EXIT_FAILURE);
+	}
+
+	if (!write_file(SPLIT_DEBUGFS, input, ret + 1)) {
+		perror(SPLIT_DEBUGFS);
+		exit(EXIT_FAILURE);
+	}
+}
+
+#define MAX_LINE_LENGTH 500
+
+static bool check_for_pattern(FILE *fp, const char *pattern, char *buf)
+{
+	while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
+		if (!strncmp(buf, pattern, strlen(pattern)))
+			return true;
+	}
+	return false;
+}
+
+static uint64_t check_huge(void *addr)
+{
+	uint64_t thp = 0;
+	int ret;
+	FILE *fp;
+	char buffer[MAX_LINE_LENGTH];
+	char addr_pattern[MAX_LINE_LENGTH];
+
+	ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-",
+		       (unsigned long) addr);
+	if (ret >= MAX_LINE_LENGTH) {
+		printf("%s: Pattern is too long\n", __func__);
+		exit(EXIT_FAILURE);
+	}
+
+
+	fp = fopen(SMAP_PATH, "r");
+	if (!fp) {
+		printf("%s: Failed to open file %s\n", __func__, SMAP_PATH);
+		exit(EXIT_FAILURE);
+	}
+	if (!check_for_pattern(fp, addr_pattern, buffer))
+		goto err_out;
+
+	/*
+	 * Fetch the AnonHugePages: in the same block and check the number of
+	 * hugepages.
+	 */
+	if (!check_for_pattern(fp, "AnonHugePages:", buffer))
+		goto err_out;
+
+	if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1) {
+		printf("Reading smap error\n");
+		exit(EXIT_FAILURE);
+	}
+
+err_out:
+	fclose(fp);
+	return thp;
+}
+
+void split_pmd_thp(void)
+{
+	char *one_page;
+	size_t len = 4 * pmd_pagesize;
+	uint64_t thp_size;
+	size_t i;
+
+	one_page = memalign(pmd_pagesize, len);
+
+	if (!one_page) {
+		printf("Fail to allocate memory\n");
+		exit(EXIT_FAILURE);
+	}
+
+	madvise(one_page, len, MADV_HUGEPAGE);
+
+	for (i = 0; i < len; i++)
+		one_page[i] = (char)i;
+
+	thp_size = check_huge(one_page);
+	if (!thp_size) {
+		printf("No THP is allocated\n");
+		exit(EXIT_FAILURE);
+	}
+
+	/* split all THPs */
+	write_debugfs(PID_FMT, getpid(), (uint64_t)one_page,
+		(uint64_t)one_page + len);
+
+	for (i = 0; i < len; i++)
+		if (one_page[i] != (char)i) {
+			printf("%ld byte corrupted\n", i);
+			exit(EXIT_FAILURE);
+		}
+
+
+	thp_size = check_huge(one_page);
+	if (thp_size) {
+		printf("Still %ld kB AnonHugePages not split\n", thp_size);
+		exit(EXIT_FAILURE);
+	}
+
+	printf("Split huge pages successful\n");
+	free(one_page);
+}
+
+void split_pte_mapped_thp(void)
+{
+	char *one_page, *pte_mapped, *pte_mapped2;
+	size_t len = 4 * pmd_pagesize;
+	uint64_t thp_size;
+	size_t i;
+	const char *pagemap_template = "/proc/%d/pagemap";
+	const char *kpageflags_proc = "/proc/kpageflags";
+	char pagemap_proc[255];
+	int pagemap_fd;
+	int kpageflags_fd;
+
+	if (snprintf(pagemap_proc, 255, pagemap_template, getpid()) < 0) {
+		perror("get pagemap proc error");
+		exit(EXIT_FAILURE);
+	}
+	pagemap_fd = open(pagemap_proc, O_RDONLY);
+
+	if (pagemap_fd == -1) {
+		perror("read pagemap:");
+		exit(EXIT_FAILURE);
+	}
+
+	kpageflags_fd = open(kpageflags_proc, O_RDONLY);
+
+	if (kpageflags_fd == -1) {
+		perror("read kpageflags:");
+		exit(EXIT_FAILURE);
+	}
+
+	one_page = mmap((void *)(1UL << 30), len, PROT_READ | PROT_WRITE,
+			MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+
+	madvise(one_page, len, MADV_HUGEPAGE);
+
+	for (i = 0; i < len; i++)
+		one_page[i] = (char)i;
+
+	thp_size = check_huge(one_page);
+	if (!thp_size) {
+		printf("No THP is allocated\n");
+		exit(EXIT_FAILURE);
+	}
+
+	/* remap the first pagesize of first THP */
+	pte_mapped = mremap(one_page, pagesize, pagesize, MREMAP_MAYMOVE);
+
+	/* remap the Nth pagesize of Nth THP */
+	for (i = 1; i < 4; i++) {
+		pte_mapped2 = mremap(one_page + pmd_pagesize * i + pagesize * i,
+				     pagesize, pagesize,
+				     MREMAP_MAYMOVE|MREMAP_FIXED,
+				     pte_mapped + pagesize * i);
+		if (pte_mapped2 == (char *)-1) {
+			perror("mremap failed");
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	/* smap does not show THPs after mremap, use kpageflags instead */
+	thp_size = 0;
+	for (i = 0; i < pagesize * 4; i++)
+		if (i % pagesize == 0 &&
+		    is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
+			thp_size++;
+
+	if (thp_size != 4) {
+		printf("Some THPs are missing during mremap\n");
+		exit(EXIT_FAILURE);
+	}
+
+	/* split all remapped THPs */
+	write_debugfs(PID_FMT, getpid(), (uint64_t)pte_mapped,
+		      (uint64_t)pte_mapped + pagesize * 4);
+
+	/* smap does not show THPs after mremap, use kpageflags instead */
+	thp_size = 0;
+	for (i = 0; i < pagesize * 4; i++) {
+		if (pte_mapped[i] != (char)i) {
+			printf("%ld byte corrupted\n", i);
+			exit(EXIT_FAILURE);
+		}
+		if (i % pagesize == 0 &&
+		    is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
+			thp_size++;
+	}
+
+	if (thp_size) {
+		printf("Still %ld THPs not split\n", thp_size);
+		exit(EXIT_FAILURE);
+	}
+
+	printf("Split PTE-mapped huge pages successful\n");
+	munmap(one_page, len);
+	close(pagemap_fd);
+	close(kpageflags_fd);
+}
+
+void split_file_backed_thp(void)
+{
+	int status;
+	int fd;
+	ssize_t num_written;
+	char tmpfs_template[] = "/tmp/thp_split_XXXXXX";
+	const char *tmpfs_loc = mkdtemp(tmpfs_template);
+	char testfile[INPUT_MAX];
+	uint64_t pgoff_start = 0, pgoff_end = 1024;
+
+	printf("Please enable pr_debug in split_huge_pages_in_file() if you need more info.\n");
+
+	status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=always,size=4m");
+
+	if (status) {
+		printf("Unable to create a tmpfs for testing\n");
+		exit(EXIT_FAILURE);
+	}
+
+	status = snprintf(testfile, INPUT_MAX, "%s/thp_file", tmpfs_loc);
+	if (status >= INPUT_MAX) {
+		printf("Fail to create file-backed THP split testing file\n");
+		goto cleanup;
+	}
+
+	fd = open(testfile, O_CREAT|O_WRONLY);
+	if (fd == -1) {
+		perror("Cannot open testing file\n");
+		goto cleanup;
+	}
+
+	/* write something to the file, so a file-backed THP can be allocated */
+	num_written = write(fd, tmpfs_loc, sizeof(tmpfs_loc));
+	close(fd);
+
+	if (num_written < 1) {
+		printf("Fail to write data to testing file\n");
+		goto cleanup;
+	}
+
+	/* split the file-backed THP */
+	write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end);
+
+	status = unlink(testfile);
+	if (status)
+		perror("Cannot remove testing file\n");
+
+cleanup:
+	status = umount(tmpfs_loc);
+	if (status) {
+		printf("Unable to umount %s\n", tmpfs_loc);
+		exit(EXIT_FAILURE);
+	}
+	status = rmdir(tmpfs_loc);
+	if (status) {
+		perror("cannot remove tmp dir");
+		exit(EXIT_FAILURE);
+	}
+
+	printf("file-backed THP split test done, please check dmesg for more information\n");
+}
+
+int main(int argc, char **argv)
+{
+	if (geteuid() != 0) {
+		printf("Please run the benchmark as root\n");
+		exit(EXIT_FAILURE);
+	}
+
+	pagesize = getpagesize();
+	pageshift = ffs(pagesize) - 1;
+	pmd_pagesize = read_pmd_pagesize();
+
+	split_pmd_thp();
+	split_pte_mapped_thp();
+	split_file_backed_thp();
+
+	return 0;
+}
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 92b8ec423201..f5ab5e0312e7 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -81,6 +81,8 @@ static volatile bool test_uffdio_copy_eexist = true;
 static volatile bool test_uffdio_zeropage_eexist = true;
 /* Whether to test uffd write-protection */
 static bool test_uffdio_wp = false;
+/* Whether to test uffd minor faults */
+static bool test_uffdio_minor = false;
 
 static bool map_shared;
 static int huge_fd;
@@ -96,6 +98,7 @@ struct uffd_stats {
 	int cpu;
 	unsigned long missing_faults;
 	unsigned long wp_faults;
+	unsigned long minor_faults;
 };
 
 /* pthread_mutex_t starts at page offset 0 */
@@ -153,17 +156,19 @@ static void uffd_stats_reset(struct uffd_stats *uffd_stats,
 		uffd_stats[i].cpu = i;
 		uffd_stats[i].missing_faults = 0;
 		uffd_stats[i].wp_faults = 0;
+		uffd_stats[i].minor_faults = 0;
 	}
 }
 
 static void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
 {
 	int i;
-	unsigned long long miss_total = 0, wp_total = 0;
+	unsigned long long miss_total = 0, wp_total = 0, minor_total = 0;
 
 	for (i = 0; i < n_cpus; i++) {
 		miss_total += stats[i].missing_faults;
 		wp_total += stats[i].wp_faults;
+		minor_total += stats[i].minor_faults;
 	}
 
 	printf("userfaults: %llu missing (", miss_total);
@@ -172,6 +177,9 @@ static void uffd_stats_report(struct uffd_stats *stats, int n_cpus)
 	printf("\b), %llu wp (", wp_total);
 	for (i = 0; i < n_cpus; i++)
 		printf("%lu+", stats[i].wp_faults);
+	printf("\b), %llu minor (", minor_total);
+	for (i = 0; i < n_cpus; i++)
+		printf("%lu+", stats[i].minor_faults);
 	printf("\b)\n");
 }
 
@@ -328,7 +336,7 @@ static struct uffd_test_ops shmem_uffd_test_ops = {
 };
 
 static struct uffd_test_ops hugetlb_uffd_test_ops = {
-	.expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC,
+	.expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC & ~(1 << _UFFDIO_CONTINUE),
 	.allocate_area	= hugetlb_allocate_area,
 	.release_pages	= hugetlb_release_pages,
 	.alias_mapping = hugetlb_alias_mapping,
@@ -362,6 +370,22 @@ static void wp_range(int ufd, __u64 start, __u64 len, bool wp)
 	}
 }
 
+static void continue_range(int ufd, __u64 start, __u64 len)
+{
+	struct uffdio_continue req;
+
+	req.range.start = start;
+	req.range.len = len;
+	req.mode = 0;
+
+	if (ioctl(ufd, UFFDIO_CONTINUE, &req)) {
+		fprintf(stderr,
+			"UFFDIO_CONTINUE failed for address 0x%" PRIx64 "\n",
+			(uint64_t)start);
+		exit(1);
+	}
+}
+
 static void *locking_thread(void *arg)
 {
 	unsigned long cpu = (unsigned long) arg;
@@ -569,8 +593,32 @@ static void uffd_handle_page_fault(struct uffd_msg *msg,
 	}
 
 	if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_WP) {
+		/* Write protect page faults */
 		wp_range(uffd, msg->arg.pagefault.address, page_size, false);
 		stats->wp_faults++;
+	} else if (msg->arg.pagefault.flags & UFFD_PAGEFAULT_FLAG_MINOR) {
+		uint8_t *area;
+		int b;
+
+		/*
+		 * Minor page faults
+		 *
+		 * To prove we can modify the original range for testing
+		 * purposes, we're going to bit flip this range before
+		 * continuing.
+		 *
+		 * Note that this requires all minor page fault tests operate on
+		 * area_dst (non-UFFD-registered) and area_dst_alias
+		 * (UFFD-registered).
+		 */
+
+		area = (uint8_t *)(area_dst +
+				   ((char *)msg->arg.pagefault.address -
+				    area_dst_alias));
+		for (b = 0; b < page_size; ++b)
+			area[b] = ~area[b];
+		continue_range(uffd, msg->arg.pagefault.address, page_size);
+		stats->minor_faults++;
 	} else {
 		/* Missing page faults */
 		if (bounces & BOUNCE_VERIFY &&
@@ -779,7 +827,7 @@ static int stress(struct uffd_stats *uffd_stats)
 	return 0;
 }
 
-static int userfaultfd_open(int features)
+static int userfaultfd_open_ext(uint64_t *features)
 {
 	struct uffdio_api uffdio_api;
 
@@ -792,7 +840,7 @@ static int userfaultfd_open(int features)
 	uffd_flags = fcntl(uffd, F_GETFD, NULL);
 
 	uffdio_api.api = UFFD_API;
-	uffdio_api.features = features;
+	uffdio_api.features = *features;
 	if (ioctl(uffd, UFFDIO_API, &uffdio_api)) {
 		fprintf(stderr, "UFFDIO_API failed.\nPlease make sure to "
 			"run with either root or ptrace capability.\n");
@@ -804,9 +852,15 @@ static int userfaultfd_open(int features)
 		return 1;
 	}
 
+	*features = uffdio_api.features;
 	return 0;
 }
 
+static int userfaultfd_open(uint64_t features)
+{
+	return userfaultfd_open_ext(&features);
+}
+
 sigjmp_buf jbuf, *sigbuf;
 
 static void sighndl(int sig, siginfo_t *siginfo, void *ptr)
@@ -1112,7 +1166,7 @@ static int userfaultfd_events_test(void)
 	}
 
 	if (!pid)
-		return faulting_process(0);
+		exit(faulting_process(0));
 
 	waitpid(pid, &err, 0);
 	if (err) {
@@ -1215,6 +1269,102 @@ static int userfaultfd_sig_test(void)
 	return userfaults != 0;
 }
 
+static int userfaultfd_minor_test(void)
+{
+	struct uffdio_register uffdio_register;
+	unsigned long expected_ioctls;
+	unsigned long p;
+	pthread_t uffd_mon;
+	uint8_t expected_byte;
+	void *expected_page;
+	char c;
+	struct uffd_stats stats = { 0 };
+	uint64_t features = UFFD_FEATURE_MINOR_HUGETLBFS;
+
+	if (!test_uffdio_minor)
+		return 0;
+
+	printf("testing minor faults: ");
+	fflush(stdout);
+
+	if (uffd_test_ops->release_pages(area_dst))
+		return 1;
+
+	if (userfaultfd_open_ext(&features))
+		return 1;
+	/* If kernel reports the feature isn't supported, skip the test. */
+	if (!(features & UFFD_FEATURE_MINOR_HUGETLBFS)) {
+		printf("skipping test due to lack of feature support\n");
+		fflush(stdout);
+		return 0;
+	}
+
+	uffdio_register.range.start = (unsigned long)area_dst_alias;
+	uffdio_register.range.len = nr_pages * page_size;
+	uffdio_register.mode = UFFDIO_REGISTER_MODE_MINOR;
+	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {
+		fprintf(stderr, "register failure\n");
+		exit(1);
+	}
+
+	expected_ioctls = uffd_test_ops->expected_ioctls;
+	expected_ioctls |= 1 << _UFFDIO_CONTINUE;
+	if ((uffdio_register.ioctls & expected_ioctls) != expected_ioctls) {
+		fprintf(stderr, "unexpected missing ioctl(s)\n");
+		exit(1);
+	}
+
+	/*
+	 * After registering with UFFD, populate the non-UFFD-registered side of
+	 * the shared mapping. This should *not* trigger any UFFD minor faults.
+	 */
+	for (p = 0; p < nr_pages; ++p) {
+		memset(area_dst + (p * page_size), p % ((uint8_t)-1),
+		       page_size);
+	}
+
+	if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, &stats)) {
+		perror("uffd_poll_thread create");
+		exit(1);
+	}
+
+	/*
+	 * Read each of the pages back using the UFFD-registered mapping. We
+	 * expect that the first time we touch a page, it will result in a minor
+	 * fault. uffd_poll_thread will resolve the fault by bit-flipping the
+	 * page's contents, and then issuing a CONTINUE ioctl.
+	 */
+
+	if (posix_memalign(&expected_page, page_size, page_size)) {
+		fprintf(stderr, "out of memory\n");
+		return 1;
+	}
+
+	for (p = 0; p < nr_pages; ++p) {
+		expected_byte = ~((uint8_t)(p % ((uint8_t)-1)));
+		memset(expected_page, expected_byte, page_size);
+		if (my_bcmp(expected_page, area_dst_alias + (p * page_size),
+			    page_size)) {
+			fprintf(stderr,
+				"unexpected page contents after minor fault\n");
+			exit(1);
+		}
+	}
+
+	if (write(pipefd[1], &c, sizeof(c)) != sizeof(c)) {
+		perror("pipe write");
+		exit(1);
+	}
+	if (pthread_join(uffd_mon, NULL))
+		return 1;
+
+	close(uffd);
+
+	uffd_stats_report(&stats, 1);
+
+	return stats.missing_faults != 0 || stats.minor_faults != nr_pages;
+}
+
 static int userfaultfd_stress(void)
 {
 	void *area;
@@ -1413,7 +1563,7 @@ static int userfaultfd_stress(void)
 
 	close(uffd);
 	return userfaultfd_zeropage_test() || userfaultfd_sig_test()
-		|| userfaultfd_events_test();
+		|| userfaultfd_events_test() || userfaultfd_minor_test();
 }
 
 /*
@@ -1454,6 +1604,8 @@ static void set_test_type(const char *type)
 		map_shared = true;
 		test_type = TEST_HUGETLB;
 		uffd_test_ops = &hugetlb_uffd_test_ops;
+		/* Minor faults require shared hugetlb; only enable here. */
+		test_uffdio_minor = true;
 	} else if (!strcmp(type, "shmem")) {
 		map_shared = true;
 		test_type = TEST_SHMEM;