Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

21 files changed, 2293 insertions, 0 deletions

diff --git a/tools/verification/dot2/Makefile b/tools/verification/dot2/Makefile
new file mode 100644
index 000000000..021beb07a
--- /dev/null
+++ b/tools/verification/dot2/Makefile
@@ -0,0 +1,26 @@
+INSTALL=install
+
+prefix  ?= /usr
+bindir  ?= $(prefix)/bin
+mandir  ?= $(prefix)/share/man
+miscdir ?= $(prefix)/share/dot2
+srcdir  ?= $(prefix)/src
+
+PYLIB  ?= $(shell python3 -c 'import sysconfig;  print (sysconfig.get_path("purelib"))')
+
+.PHONY: all
+all:
+
+.PHONY: clean
+clean:
+
+.PHONY: install
+install:
+	$(INSTALL) automata.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/automata.py
+	$(INSTALL) dot2c.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/dot2c.py
+	$(INSTALL) dot2c -D -m 755 $(DESTDIR)$(bindir)/
+	$(INSTALL) dot2k.py -D -m 644 $(DESTDIR)$(PYLIB)/dot2/dot2k.py
+	$(INSTALL) dot2k -D -m 755 $(DESTDIR)$(bindir)/
+
+	mkdir -p ${miscdir}/
+	cp -rp dot2k_templates $(DESTDIR)$(miscdir)/
diff --git a/tools/verification/dot2/automata.py b/tools/verification/dot2/automata.py
new file mode 100644
index 000000000..baffeb960
--- /dev/null
+++ b/tools/verification/dot2/automata.py
@@ -0,0 +1,174 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# Automata object: parse an automata in dot file digraph format into a python object
+#
+# For further information, see:
+#   Documentation/trace/rv/deterministic_automata.rst
+
+import ntpath
+
+class Automata:
+    """Automata class: Reads a dot file and part it as an automata.
+
+    Attributes:
+        dot_file: A dot file with an state_automaton definition.
+    """
+
+    invalid_state_str = "INVALID_STATE"
+
+    def __init__(self, file_path):
+        self.__dot_path = file_path
+        self.name = self.__get_model_name()
+        self.__dot_lines = self.__open_dot()
+        self.states, self.initial_state, self.final_states = self.__get_state_variables()
+        self.events = self.__get_event_variables()
+        self.function = self.__create_matrix()
+
+    def __get_model_name(self):
+        basename = ntpath.basename(self.__dot_path)
+        if basename.endswith(".dot") == False:
+            print("not a dot file")
+            raise Exception("not a dot file: %s" % self.__dot_path)
+
+        model_name = basename[0:-4]
+        if model_name.__len__() == 0:
+            raise Exception("not a dot file: %s" % self.__dot_path)
+
+        return model_name
+
+    def __open_dot(self):
+        cursor = 0
+        dot_lines = []
+        try:
+            dot_file = open(self.__dot_path)
+        except:
+            raise Exception("Cannot open the file: %s" % self.__dot_path)
+
+        dot_lines = dot_file.read().splitlines()
+        dot_file.close()
+
+        # checking the first line:
+        line = dot_lines[cursor].split()
+
+        if (line[0] != "digraph") and (line[1] != "state_automaton"):
+            raise Exception("Not a valid .dot format: %s" % self.__dot_path)
+        else:
+            cursor += 1
+        return dot_lines
+
+    def __get_cursor_begin_states(self):
+        cursor = 0
+        while self.__dot_lines[cursor].split()[0] != "{node":
+            cursor += 1
+        return cursor
+
+    def __get_cursor_begin_events(self):
+        cursor = 0
+        while self.__dot_lines[cursor].split()[0] != "{node":
+           cursor += 1
+        while self.__dot_lines[cursor].split()[0] == "{node":
+           cursor += 1
+        # skip initial state transition
+        cursor += 1
+        return cursor
+
+    def __get_state_variables(self):
+        # wait for node declaration
+        states = []
+        final_states = []
+
+        has_final_states = False
+        cursor = self.__get_cursor_begin_states()
+
+        # process nodes
+        while self.__dot_lines[cursor].split()[0] == "{node":
+            line = self.__dot_lines[cursor].split()
+            raw_state = line[-1]
+
+            #  "enabled_fired"}; -> enabled_fired
+            state = raw_state.replace('"', '').replace('};', '').replace(',','_')
+            if state[0:7] == "__init_":
+                initial_state = state[7:]
+            else:
+                states.append(state)
+                if self.__dot_lines[cursor].__contains__("doublecircle") == True:
+                    final_states.append(state)
+                    has_final_states = True
+
+                if self.__dot_lines[cursor].__contains__("ellipse") == True:
+                    final_states.append(state)
+                    has_final_states = True
+
+            cursor += 1
+
+        states = sorted(set(states))
+        states.remove(initial_state)
+
+        # Insert the initial state at the bein og the states
+        states.insert(0, initial_state)
+
+        if has_final_states == False:
+            final_states.append(initial_state)
+
+        return states, initial_state, final_states
+
+    def __get_event_variables(self):
+        # here we are at the begin of transitions, take a note, we will return later.
+        cursor = self.__get_cursor_begin_events()
+
+        events = []
+        while self.__dot_lines[cursor][1] == '"':
+            # transitions have the format:
+            # "all_fired" -> "both_fired" [ label = "disable_irq" ];
+            #  ------------ event is here ------------^^^^^
+            if self.__dot_lines[cursor].split()[1] == "->":
+                line = self.__dot_lines[cursor].split()
+                event = line[-2].replace('"','')
+
+                # when a transition has more than one lables, they are like this
+                # "local_irq_enable\nhw_local_irq_enable_n"
+                # so split them.
+
+                event = event.replace("\\n", " ")
+                for i in event.split():
+                    events.append(i)
+            cursor += 1
+
+        return sorted(set(events))
+
+    def __create_matrix(self):
+        # transform the array into a dictionary
+        events = self.events
+        states = self.states
+        events_dict = {}
+        states_dict = {}
+        nr_event = 0
+        for event in events:
+            events_dict[event] = nr_event
+            nr_event += 1
+
+        nr_state = 0
+        for state in states:
+            states_dict[state] = nr_state
+            nr_state += 1
+
+        # declare the matrix....
+        matrix = [[ self.invalid_state_str for x in range(nr_event)] for y in range(nr_state)]
+
+        # and we are back! Let's fill the matrix
+        cursor = self.__get_cursor_begin_events()
+
+        while self.__dot_lines[cursor][1] == '"':
+            if self.__dot_lines[cursor].split()[1] == "->":
+                line = self.__dot_lines[cursor].split()
+                origin_state = line[0].replace('"','').replace(',','_')
+                dest_state = line[2].replace('"','').replace(',','_')
+                possible_events = line[-2].replace('"','').replace("\\n", " ")
+                for event in possible_events.split():
+                    matrix[states_dict[origin_state]][events_dict[event]] = dest_state
+            cursor += 1
+
+        return matrix
diff --git a/tools/verification/dot2/dot2c b/tools/verification/dot2/dot2c
new file mode 100644
index 000000000..3fe89ab88
--- /dev/null
+++ b/tools/verification/dot2/dot2c
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# dot2c: parse an automata in dot file digraph format into a C
+#
+# This program was written in the development of this paper:
+#  de Oliveira, D. B. and Cucinotta, T. and de Oliveira, R. S.
+#  "Efficient Formal Verification for the Linux Kernel." International
+#  Conference on Software Engineering and Formal Methods. Springer, Cham, 2019.
+#
+# For further information, see:
+#   Documentation/trace/rv/deterministic_automata.rst
+
+if __name__ == '__main__':
+    from dot2 import dot2c
+    import argparse
+    import sys
+
+    parser = argparse.ArgumentParser(description='dot2c: converts a .dot file into a C structure')
+    parser.add_argument('dot_file',  help='The dot file to be converted')
+
+    args = parser.parse_args()
+    d = dot2c.Dot2c(args.dot_file)
+    d.print_model_classic()
diff --git a/tools/verification/dot2/dot2c.py b/tools/verification/dot2/dot2c.py
new file mode 100644
index 000000000..87d8a1e14
--- /dev/null
+++ b/tools/verification/dot2/dot2c.py
@@ -0,0 +1,254 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# dot2c: parse an automata in dot file digraph format into a C
+#
+# This program was written in the development of this paper:
+#  de Oliveira, D. B. and Cucinotta, T. and de Oliveira, R. S.
+#  "Efficient Formal Verification for the Linux Kernel." International
+#  Conference on Software Engineering and Formal Methods. Springer, Cham, 2019.
+#
+# For further information, see:
+#   Documentation/trace/rv/deterministic_automata.rst
+
+from dot2.automata import Automata
+
+class Dot2c(Automata):
+    enum_suffix = ""
+    enum_states_def = "states"
+    enum_events_def = "events"
+    struct_automaton_def = "automaton"
+    var_automaton_def = "aut"
+
+    def __init__(self, file_path):
+        super().__init__(file_path)
+        self.line_length = 100
+
+    def __buff_to_string(self, buff):
+        string = ""
+
+        for line in buff:
+            string = string + line + "\n"
+
+        # cut off the last \n
+        return string[:-1]
+
+    def __get_enum_states_content(self):
+        buff = []
+        buff.append("\t%s%s = 0," % (self.initial_state, self.enum_suffix))
+        for state in self.states:
+            if state != self.initial_state:
+                buff.append("\t%s%s," % (state, self.enum_suffix))
+        buff.append("\tstate_max%s" % (self.enum_suffix))
+
+        return buff
+
+    def get_enum_states_string(self):
+        buff = self.__get_enum_states_content()
+        return self.__buff_to_string(buff)
+
+    def format_states_enum(self):
+        buff = []
+        buff.append("enum %s {" % self.enum_states_def)
+        buff.append(self.get_enum_states_string())
+        buff.append("};\n")
+
+        return buff
+
+    def __get_enum_events_content(self):
+        buff = []
+        first = True
+        for event in self.events:
+            if first:
+                buff.append("\t%s%s = 0," % (event, self.enum_suffix))
+                first = False
+            else:
+                buff.append("\t%s%s," % (event, self.enum_suffix))
+
+        buff.append("\tevent_max%s" % self.enum_suffix)
+
+        return buff
+
+    def get_enum_events_string(self):
+        buff = self.__get_enum_events_content()
+        return self.__buff_to_string(buff)
+
+    def format_events_enum(self):
+        buff = []
+        buff.append("enum %s {" % self.enum_events_def)
+        buff.append(self.get_enum_events_string())
+        buff.append("};\n")
+
+        return buff
+
+    def get_minimun_type(self):
+        min_type = "unsigned char"
+
+        if self.states.__len__() > 255:
+            min_type = "unsigned short"
+
+        if self.states.__len__() > 65535:
+            min_type = "unsigned int"
+
+        if self.states.__len__() > 1000000:
+            raise Exception("Too many states: %d" % self.states.__len__())
+
+        return min_type
+
+    def format_automaton_definition(self):
+        min_type = self.get_minimun_type()
+        buff = []
+        buff.append("struct %s {" % self.struct_automaton_def)
+        buff.append("\tchar *state_names[state_max%s];" % (self.enum_suffix))
+        buff.append("\tchar *event_names[event_max%s];" % (self.enum_suffix))
+        buff.append("\t%s function[state_max%s][event_max%s];" % (min_type, self.enum_suffix, self.enum_suffix))
+        buff.append("\t%s initial_state;" % min_type)
+        buff.append("\tbool final_states[state_max%s];" % (self.enum_suffix))
+        buff.append("};\n")
+        return buff
+
+    def format_aut_init_header(self):
+        buff = []
+        buff.append("static const struct %s %s = {" % (self.struct_automaton_def, self.var_automaton_def))
+        return buff
+
+    def __get_string_vector_per_line_content(self, buff):
+        first = True
+        string = ""
+        for entry in buff:
+            if first:
+                string = string + "\t\t\"" + entry
+                first = False;
+            else:
+                string = string + "\",\n\t\t\"" + entry
+        string = string + "\""
+
+        return string
+
+    def get_aut_init_events_string(self):
+        return self.__get_string_vector_per_line_content(self.events)
+
+    def get_aut_init_states_string(self):
+        return self.__get_string_vector_per_line_content(self.states)
+
+    def format_aut_init_events_string(self):
+        buff = []
+        buff.append("\t.event_names = {")
+        buff.append(self.get_aut_init_events_string())
+        buff.append("\t},")
+        return buff
+
+    def format_aut_init_states_string(self):
+        buff = []
+        buff.append("\t.state_names = {")
+        buff.append(self.get_aut_init_states_string())
+        buff.append("\t},")
+
+        return buff
+
+    def __get_max_strlen_of_states(self):
+        max_state_name = max(self.states, key = len).__len__()
+        return max(max_state_name, self.invalid_state_str.__len__())
+
+    def __get_state_string_length(self):
+        maxlen = self.__get_max_strlen_of_states() + self.enum_suffix.__len__()
+        return "%" + str(maxlen) + "s"
+
+    def get_aut_init_function(self):
+        nr_states = self.states.__len__()
+        nr_events = self.events.__len__()
+        buff = []
+
+        strformat = self.__get_state_string_length()
+
+        for x in range(nr_states):
+            line = "\t\t{ "
+            for y in range(nr_events):
+                next_state = self.function[x][y]
+                if next_state != self.invalid_state_str:
+                    next_state = self.function[x][y] + self.enum_suffix
+
+                if y != nr_events-1:
+                    line = line + strformat % next_state + ", "
+                else:
+                    line = line + strformat % next_state + " },"
+            buff.append(line)
+
+        return self.__buff_to_string(buff)
+
+    def format_aut_init_function(self):
+        buff = []
+        buff.append("\t.function = {")
+        buff.append(self.get_aut_init_function())
+        buff.append("\t},")
+
+        return buff
+
+    def get_aut_init_initial_state(self):
+        return self.initial_state
+
+    def format_aut_init_initial_state(self):
+        buff = []
+        initial_state = self.get_aut_init_initial_state()
+        buff.append("\t.initial_state = " + initial_state + self.enum_suffix + ",")
+
+        return buff
+
+    def get_aut_init_final_states(self):
+        line = ""
+        first = True
+        for state in self.states:
+            if first == False:
+                line = line + ', '
+            else:
+                first = False
+
+            if self.final_states.__contains__(state):
+                line = line + '1'
+            else:
+                line = line + '0'
+        return line
+
+    def format_aut_init_final_states(self):
+       buff = []
+       buff.append("\t.final_states = { %s }," % self.get_aut_init_final_states())
+
+       return buff
+
+    def __get_automaton_initialization_footer_string(self):
+        footer = "};\n"
+        return footer
+
+    def format_aut_init_footer(self):
+        buff = []
+        buff.append(self.__get_automaton_initialization_footer_string())
+
+        return buff
+
+    def format_invalid_state(self):
+        buff = []
+        buff.append("#define %s state_max%s\n" % (self.invalid_state_str, self.enum_suffix))
+
+        return buff
+
+    def format_model(self):
+        buff = []
+        buff += self.format_states_enum()
+        buff += self.format_invalid_state()
+        buff += self.format_events_enum()
+        buff += self.format_automaton_definition()
+        buff += self.format_aut_init_header()
+        buff += self.format_aut_init_states_string()
+        buff += self.format_aut_init_events_string()
+        buff += self.format_aut_init_function()
+        buff += self.format_aut_init_initial_state()
+        buff += self.format_aut_init_final_states()
+        buff += self.format_aut_init_footer()
+
+        return buff
+
+    def print_model_classic(self):
+        buff = self.format_model()
+        print(self.__buff_to_string(buff))
diff --git a/tools/verification/dot2/dot2k b/tools/verification/dot2/dot2k
new file mode 100644
index 000000000..9dcd38abe
--- /dev/null
+++ b/tools/verification/dot2/dot2k
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# dot2k: transform dot files into a monitor for the Linux kernel.
+#
+# For further information, see:
+#   Documentation/trace/rv/da_monitor_synthesis.rst
+
+if __name__ == '__main__':
+    from dot2.dot2k import dot2k
+    import argparse
+    import ntpath
+    import os
+    import platform
+    import sys
+    import sys
+    import argparse
+
+    parser = argparse.ArgumentParser(description='transform .dot file into kernel rv monitor')
+    parser.add_argument('-d', "--dot", dest="dot_file", required=True)
+    parser.add_argument('-t', "--monitor_type", dest="monitor_type", required=True)
+    parser.add_argument('-n', "--model_name", dest="model_name", required=False)
+    parser.add_argument("-D", "--description", dest="description", required=False)
+    params = parser.parse_args()
+
+    print("Opening and parsing the dot file %s" % params.dot_file)
+    try:
+        monitor=dot2k(params.dot_file, params.monitor_type)
+    except Exception as e:
+        print('Error: '+ str(e))
+        print("Sorry : :-(")
+        sys.exit(1)
+
+    # easier than using argparse action.
+    if params.model_name != None:
+        print(params.model_name)
+
+    print("Writing the monitor into the directory %s" % monitor.name)
+    monitor.print_files()
+    print("Almost done, checklist")
+    print("  - Edit the %s/%s.c to add the instrumentation" % (monitor.name, monitor.name))
+    print("  - Edit include/trace/events/rv.h to add the tracepoint entry")
+    print("  - Move it to the kernel's monitor directory")
+    print("  - Edit kernel/trace/rv/Makefile")
+    print("  - Edit kernel/trace/rv/Kconfig")
diff --git a/tools/verification/dot2/dot2k.py b/tools/verification/dot2/dot2k.py
new file mode 100644
index 000000000..016550fcc
--- /dev/null
+++ b/tools/verification/dot2/dot2k.py
@@ -0,0 +1,177 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2019-2022 Red Hat, Inc. Daniel Bristot de Oliveira <bristot@kernel.org>
+#
+# dot2k: transform dot files into a monitor for the Linux kernel.
+#
+# For further information, see:
+#   Documentation/trace/rv/da_monitor_synthesis.rst
+
+from dot2.dot2c import Dot2c
+import platform
+import os
+
+class dot2k(Dot2c):
+    monitor_types = { "global" : 1, "per_cpu" : 2, "per_task" : 3 }
+    monitor_templates_dir = "dot2k/rv_templates/"
+    monitor_type = "per_cpu"
+
+    def __init__(self, file_path, MonitorType):
+        super().__init__(file_path)
+
+        self.monitor_type = self.monitor_types.get(MonitorType)
+        if self.monitor_type == None:
+            raise Exception("Unknown monitor type: %s" % MonitorType)
+
+        self.monitor_type = MonitorType
+        self.__fill_rv_templates_dir()
+        self.main_c = self.__open_file(self.monitor_templates_dir + "main_" + MonitorType + ".c")
+        self.enum_suffix = "_%s" % self.name
+
+    def __fill_rv_templates_dir(self):
+
+        if os.path.exists(self.monitor_templates_dir) == True:
+            return
+
+        if platform.system() != "Linux":
+            raise Exception("I can only run on Linux.")
+
+        kernel_path = "/lib/modules/%s/build/tools/verification/dot2/dot2k_templates/" % (platform.release())
+
+        if os.path.exists(kernel_path) == True:
+            self.monitor_templates_dir = kernel_path
+            return
+
+        if os.path.exists("/usr/share/dot2/dot2k_templates/") == True:
+            self.monitor_templates_dir = "/usr/share/dot2/dot2k_templates/"
+            return
+
+        raise Exception("Could not find the template directory, do you have the kernel source installed?")
+
+
+    def __open_file(self, path):
+        try:
+            fd = open(path)
+        except OSError:
+            raise Exception("Cannot open the file: %s" % path)
+
+        content = fd.read()
+
+        return content
+
+    def __buff_to_string(self, buff):
+        string = ""
+
+        for line in buff:
+            string = string + line + "\n"
+
+        # cut off the last \n
+        return string[:-1]
+
+    def fill_tracepoint_handlers_skel(self):
+        buff = []
+        for event in self.events:
+            buff.append("static void handle_%s(void *data, /* XXX: fill header */)" % event)
+            buff.append("{")
+            if self.monitor_type == "per_task":
+                buff.append("\tstruct task_struct *p = /* XXX: how do I get p? */;");
+                buff.append("\tda_handle_event_%s(p, %s%s);" % (self.name, event, self.enum_suffix));
+            else:
+                buff.append("\tda_handle_event_%s(%s%s);" % (self.name, event, self.enum_suffix));
+            buff.append("}")
+            buff.append("")
+        return self.__buff_to_string(buff)
+
+    def fill_tracepoint_attach_probe(self):
+        buff = []
+        for event in self.events:
+            buff.append("\trv_attach_trace_probe(\"%s\", /* XXX: tracepoint */, handle_%s);" % (self.name, event))
+        return self.__buff_to_string(buff)
+
+    def fill_tracepoint_detach_helper(self):
+        buff = []
+        for event in self.events:
+            buff.append("\trv_detach_trace_probe(\"%s\", /* XXX: tracepoint */, handle_%s);" % (self.name, event))
+        return self.__buff_to_string(buff)
+
+    def fill_main_c(self):
+        main_c = self.main_c
+        min_type = self.get_minimun_type()
+        nr_events = self.events.__len__()
+        tracepoint_handlers = self.fill_tracepoint_handlers_skel()
+        tracepoint_attach = self.fill_tracepoint_attach_probe()
+        tracepoint_detach = self.fill_tracepoint_detach_helper()
+
+        main_c = main_c.replace("MIN_TYPE", min_type)
+        main_c = main_c.replace("MODEL_NAME", self.name)
+        main_c = main_c.replace("NR_EVENTS", str(nr_events))
+        main_c = main_c.replace("TRACEPOINT_HANDLERS_SKEL", tracepoint_handlers)
+        main_c = main_c.replace("TRACEPOINT_ATTACH", tracepoint_attach)
+        main_c = main_c.replace("TRACEPOINT_DETACH", tracepoint_detach)
+
+        return main_c
+
+    def fill_model_h_header(self):
+        buff = []
+        buff.append("/*")
+        buff.append(" * Automatically generated C representation of %s automaton" % (self.name))
+        buff.append(" * For further information about this format, see kernel documentation:")
+        buff.append(" *   Documentation/trace/rv/deterministic_automata.rst")
+        buff.append(" */")
+        buff.append("")
+
+        return buff
+
+    def fill_model_h(self):
+        #
+        # Adjust the definition names
+        #
+        self.enum_states_def = "states_%s" % self.name
+        self.enum_events_def = "events_%s" % self.name
+        self.struct_automaton_def = "automaton_%s" % self.name
+        self.var_automaton_def = "automaton_%s" % self.name
+
+        buff = self.fill_model_h_header()
+        buff += self.format_model()
+
+        return self.__buff_to_string(buff)
+
+    def __create_directory(self):
+        try:
+            os.mkdir(self.name)
+        except FileExistsError:
+            return
+        except:
+            print("Fail creating the output dir: %s" % self.name)
+
+    def __create_file(self, file_name, content):
+        path = "%s/%s" % (self.name, file_name)
+        try:
+            file = open(path, 'w')
+        except FileExistsError:
+            return
+        except:
+            print("Fail creating file: %s" % path)
+
+        file.write(content)
+
+        file.close()
+
+    def __get_main_name(self):
+        path = "%s/%s" % (self.name, "main.c")
+        if os.path.exists(path) == False:
+           return "main.c"
+        return "__main.c"
+
+    def print_files(self):
+        main_c = self.fill_main_c()
+        model_h = self.fill_model_h()
+
+        self.__create_directory()
+
+        path = "%s.c" % self.name
+        self.__create_file(path, main_c)
+
+        path = "%s.h" % self.name
+        self.__create_file(path, model_h)
diff --git a/tools/verification/dot2/dot2k_templates/main_global.c b/tools/verification/dot2/dot2k_templates/main_global.c
new file mode 100644
index 000000000..a5658bfb9
--- /dev/null
+++ b/tools/verification/dot2/dot2k_templates/main_global.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ftrace.h>
+#include <linux/tracepoint.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rv.h>
+#include <rv/instrumentation.h>
+#include <rv/da_monitor.h>
+
+#define MODULE_NAME "MODEL_NAME"
+
+/*
+ * XXX: include required tracepoint headers, e.g.,
+ * #include <trace/events/sched.h>
+ */
+#include <trace/events/rv.h>
+
+/*
+ * This is the self-generated part of the monitor. Generally, there is no need
+ * to touch this section.
+ */
+#include "MODEL_NAME.h"
+
+/*
+ * Declare the deterministic automata monitor.
+ *
+ * The rv monitor reference is needed for the monitor declaration.
+ */
+static struct rv_monitor rv_MODEL_NAME;
+DECLARE_DA_MON_GLOBAL(MODEL_NAME, MIN_TYPE);
+
+/*
+ * This is the instrumentation part of the monitor.
+ *
+ * This is the section where manual work is required. Here the kernel events
+ * are translated into model's event.
+ *
+ */
+TRACEPOINT_HANDLERS_SKEL
+static int enable_MODEL_NAME(void)
+{
+	int retval;
+
+	retval = da_monitor_init_MODEL_NAME();
+	if (retval)
+		return retval;
+
+TRACEPOINT_ATTACH
+
+	return 0;
+}
+
+static void disable_MODEL_NAME(void)
+{
+	rv_MODEL_NAME.enabled = 0;
+
+TRACEPOINT_DETACH
+
+	da_monitor_destroy_MODEL_NAME();
+}
+
+/*
+ * This is the monitor register section.
+ */
+static struct rv_monitor rv_MODEL_NAME = {
+	.name = "MODEL_NAME",
+	.description = "auto-generated MODEL_NAME",
+	.enable = enable_MODEL_NAME,
+	.disable = disable_MODEL_NAME,
+	.reset = da_monitor_reset_all_MODEL_NAME,
+	.enabled = 0,
+};
+
+static int __init register_MODEL_NAME(void)
+{
+	rv_register_monitor(&rv_MODEL_NAME);
+	return 0;
+}
+
+static void __exit unregister_MODEL_NAME(void)
+{
+	rv_unregister_monitor(&rv_MODEL_NAME);
+}
+
+module_init(register_MODEL_NAME);
+module_exit(unregister_MODEL_NAME);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("dot2k: auto-generated");
+MODULE_DESCRIPTION("MODEL_NAME");
diff --git a/tools/verification/dot2/dot2k_templates/main_per_cpu.c b/tools/verification/dot2/dot2k_templates/main_per_cpu.c
new file mode 100644
index 000000000..03539a976
--- /dev/null
+++ b/tools/verification/dot2/dot2k_templates/main_per_cpu.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ftrace.h>
+#include <linux/tracepoint.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rv.h>
+#include <rv/instrumentation.h>
+#include <rv/da_monitor.h>
+
+#define MODULE_NAME "MODEL_NAME"
+
+/*
+ * XXX: include required tracepoint headers, e.g.,
+ * #include <linux/trace/events/sched.h>
+ */
+#include <trace/events/rv.h>
+
+/*
+ * This is the self-generated part of the monitor. Generally, there is no need
+ * to touch this section.
+ */
+#include "MODEL_NAME.h"
+
+/*
+ * Declare the deterministic automata monitor.
+ *
+ * The rv monitor reference is needed for the monitor declaration.
+ */
+static struct rv_monitor rv_MODEL_NAME;
+DECLARE_DA_MON_PER_CPU(MODEL_NAME, MIN_TYPE);
+
+/*
+ * This is the instrumentation part of the monitor.
+ *
+ * This is the section where manual work is required. Here the kernel events
+ * are translated into model's event.
+ *
+ */
+TRACEPOINT_HANDLERS_SKEL
+static int enable_MODEL_NAME(void)
+{
+	int retval;
+
+	retval = da_monitor_init_MODEL_NAME();
+	if (retval)
+		return retval;
+
+TRACEPOINT_ATTACH
+
+	return 0;
+}
+
+static void disable_MODEL_NAME(void)
+{
+	rv_MODEL_NAME.enabled = 0;
+
+TRACEPOINT_DETACH
+
+	da_monitor_destroy_MODEL_NAME();
+}
+
+/*
+ * This is the monitor register section.
+ */
+static struct rv_monitor rv_MODEL_NAME = {
+	.name = "MODEL_NAME",
+	.description = "auto-generated MODEL_NAME",
+	.enable = enable_MODEL_NAME,
+	.disable = disable_MODEL_NAME,
+	.reset = da_monitor_reset_all_MODEL_NAME,
+	.enabled = 0,
+};
+
+static int __init register_MODEL_NAME(void)
+{
+	rv_register_monitor(&rv_MODEL_NAME);
+	return 0;
+}
+
+static void __exit unregister_MODEL_NAME(void)
+{
+	rv_unregister_monitor(&rv_MODEL_NAME);
+}
+
+module_init(register_MODEL_NAME);
+module_exit(unregister_MODEL_NAME);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("dot2k: auto-generated");
+MODULE_DESCRIPTION("MODEL_NAME");
diff --git a/tools/verification/dot2/dot2k_templates/main_per_task.c b/tools/verification/dot2/dot2k_templates/main_per_task.c
new file mode 100644
index 000000000..ffd92af87
--- /dev/null
+++ b/tools/verification/dot2/dot2k_templates/main_per_task.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ftrace.h>
+#include <linux/tracepoint.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rv.h>
+#include <rv/instrumentation.h>
+#include <rv/da_monitor.h>
+
+#define MODULE_NAME "MODEL_NAME"
+
+/*
+ * XXX: include required tracepoint headers, e.g.,
+ * #include <linux/trace/events/sched.h>
+ */
+#include <trace/events/rv.h>
+
+/*
+ * This is the self-generated part of the monitor. Generally, there is no need
+ * to touch this section.
+ */
+#include "MODEL_NAME.h"
+
+/*
+ * Declare the deterministic automata monitor.
+ *
+ * The rv monitor reference is needed for the monitor declaration.
+ */
+static struct rv_monitor rv_MODEL_NAME;
+DECLARE_DA_MON_PER_TASK(MODEL_NAME, MIN_TYPE);
+
+/*
+ * This is the instrumentation part of the monitor.
+ *
+ * This is the section where manual work is required. Here the kernel events
+ * are translated into model's event.
+ *
+ */
+TRACEPOINT_HANDLERS_SKEL
+static int enable_MODEL_NAME(void)
+{
+	int retval;
+
+	retval = da_monitor_init_MODEL_NAME();
+	if (retval)
+		return retval;
+
+TRACEPOINT_ATTACH
+
+	return 0;
+}
+
+static void disable_MODEL_NAME(void)
+{
+	rv_MODEL_NAME.enabled = 0;
+
+TRACEPOINT_DETACH
+
+	da_monitor_destroy_MODEL_NAME();
+}
+
+/*
+ * This is the monitor register section.
+ */
+static struct rv_monitor rv_MODEL_NAME = {
+	.name = "MODEL_NAME",
+	.description = "auto-generated MODEL_NAME",
+	.enable = enable_MODEL_NAME,
+	.disable = disable_MODEL_NAME,
+	.reset = da_monitor_reset_all_MODEL_NAME,
+	.enabled = 0,
+};
+
+static int __init register_MODEL_NAME(void)
+{
+	rv_register_monitor(&rv_MODEL_NAME);
+	return 0;
+}
+
+static void __exit unregister_MODEL_NAME(void)
+{
+	rv_unregister_monitor(&rv_MODEL_NAME);
+}
+
+module_init(register_MODEL_NAME);
+module_exit(unregister_MODEL_NAME);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("dot2k: auto-generated");
+MODULE_DESCRIPTION("MODEL_NAME");
diff --git a/tools/verification/models/wip.dot b/tools/verification/models/wip.dot
new file mode 100644
index 000000000..2a53a9700
--- /dev/null
+++ b/tools/verification/models/wip.dot
@@ -0,0 +1,16 @@
+digraph state_automaton {
+	{node [shape = circle] "non_preemptive"};
+	{node [shape = plaintext, style=invis, label=""] "__init_preemptive"};
+	{node [shape = doublecircle] "preemptive"};
+	{node [shape = circle] "preemptive"};
+	"__init_preemptive" -> "preemptive";
+	"non_preemptive" [label = "non_preemptive"];
+	"non_preemptive" -> "non_preemptive" [ label = "sched_waking" ];
+	"non_preemptive" -> "preemptive" [ label = "preempt_enable" ];
+	"preemptive" [label = "preemptive"];
+	"preemptive" -> "non_preemptive" [ label = "preempt_disable" ];
+	{ rank = min ;
+		"__init_preemptive";
+		"preemptive";
+	}
+}
diff --git a/tools/verification/models/wwnr.dot b/tools/verification/models/wwnr.dot
new file mode 100644
index 000000000..1b206e831
--- /dev/null
+++ b/tools/verification/models/wwnr.dot
@@ -0,0 +1,16 @@
+digraph state_automaton {
+	{node [shape = plaintext, style=invis, label=""] "__init_not_running"};
+	{node [shape = ellipse] "not_running"};
+	{node [shape = plaintext] "not_running"};
+	{node [shape = plaintext] "running"};
+	"__init_not_running" -> "not_running";
+	"not_running" [label = "not_running", color = green3];
+	"not_running" -> "not_running" [ label = "wakeup" ];
+	"not_running" -> "running" [ label = "switch_in" ];
+	"running" [label = "running"];
+	"running" -> "not_running" [ label = "switch_out" ];
+	{ rank = min ;
+		"__init_not_running";
+		"not_running";
+	}
+}
diff --git a/tools/verification/rv/Makefile b/tools/verification/rv/Makefile
new file mode 100644
index 000000000..3d0f3888a
--- /dev/null
+++ b/tools/verification/rv/Makefile
@@ -0,0 +1,141 @@
+NAME	:=	rv
+# Follow the kernel version
+VERSION :=	$(shell cat VERSION 2> /dev/null || make -sC ../../.. kernelversion | grep -v make)
+
+# From libtracefs:
+# Makefiles suck: This macro sets a default value of $(2) for the
+# variable named by $(1), unless the variable has been set by
+# environment or command line. This is necessary for CC and AR
+# because make sets default values, so the simpler ?= approach
+# won't work as expected.
+define allow-override
+  $(if $(or $(findstring environment,$(origin $(1))),\
+            $(findstring command line,$(origin $(1)))),,\
+    $(eval $(1) = $(2)))
+endef
+
+# Allow setting CC and AR, or setting CROSS_COMPILE as a prefix.
+$(call allow-override,CC,$(CROSS_COMPILE)gcc)
+$(call allow-override,AR,$(CROSS_COMPILE)ar)
+$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
+$(call allow-override,PKG_CONFIG,pkg-config)
+$(call allow-override,LD_SO_CONF_PATH,/etc/ld.so.conf.d/)
+$(call allow-override,LDCONFIG,ldconfig)
+
+INSTALL	=	install
+MKDIR	=	mkdir
+FOPTS	:=	-flto=auto -ffat-lto-objects -fexceptions -fstack-protector-strong \
+		-fasynchronous-unwind-tables -fstack-clash-protection
+WOPTS	:= 	-Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -Wno-maybe-uninitialized
+
+TRACEFS_HEADERS	:= $$($(PKG_CONFIG) --cflags libtracefs)
+
+CFLAGS	:=	-O -g -DVERSION=\"$(VERSION)\" $(FOPTS) $(MOPTS) $(WOPTS) $(TRACEFS_HEADERS) $(EXTRA_CFLAGS) -I include
+LDFLAGS	:=	-ggdb $(EXTRA_LDFLAGS)
+LIBS	:=	$$($(PKG_CONFIG) --libs libtracefs)
+
+SRC	:=	$(wildcard src/*.c)
+HDR	:=	$(wildcard src/*.h)
+OBJ	:=	$(SRC:.c=.o)
+DIRS	:=	src
+FILES	:=	Makefile README.txt
+CEXT	:=	bz2
+TARBALL	:=	$(NAME)-$(VERSION).tar.$(CEXT)
+TAROPTS	:=	-cvjf $(TARBALL)
+BINDIR	:=	/usr/bin
+DATADIR	:=	/usr/share
+DOCDIR	:=	$(DATADIR)/doc
+MANDIR	:=	$(DATADIR)/man
+LICDIR	:=	$(DATADIR)/licenses
+SRCTREE	:=	$(or $(BUILD_SRC),$(CURDIR))
+
+# If running from the tarball, man pages are stored in the Documentation
+# dir. If running from the kernel source, man pages are stored in
+# Documentation/tools/rv/.
+ifneq ($(wildcard Documentation/.*),)
+DOCSRC	=	Documentation/
+else
+DOCSRC	=	$(SRCTREE)/../../../Documentation/tools/rv/
+endif
+
+LIBTRACEEVENT_MIN_VERSION = 1.5
+LIBTRACEFS_MIN_VERSION = 1.3
+
+.PHONY:	all warnings show_warnings
+all:	warnings rv
+
+TEST_LIBTRACEEVENT = $(shell sh -c "$(PKG_CONFIG) --atleast-version $(LIBTRACEEVENT_MIN_VERSION) libtraceevent > /dev/null 2>&1 || echo n")
+ifeq ("$(TEST_LIBTRACEEVENT)", "n")
+WARNINGS = show_warnings
+MISSING_LIBS += echo "**   libtraceevent version $(LIBTRACEEVENT_MIN_VERSION) or higher";
+MISSING_PACKAGES += "libtraceevent-devel"
+MISSING_SOURCE += echo "**  https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/ ";
+endif
+
+TEST_LIBTRACEFS = $(shell sh -c "$(PKG_CONFIG) --atleast-version $(LIBTRACEFS_MIN_VERSION) libtracefs > /dev/null 2>&1 || echo n")
+ifeq ("$(TEST_LIBTRACEFS)", "n")
+WARNINGS = show_warnings
+MISSING_LIBS += echo "**   libtracefs version $(LIBTRACEFS_MIN_VERSION) or higher";
+MISSING_PACKAGES += "libtracefs-devel"
+MISSING_SOURCE += echo "**  https://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git/ ";
+endif
+
+define show_dependencies
+	@echo "********************************************";				\
+	echo "** NOTICE: Failed build dependencies";					\
+	echo "**";									\
+	echo "** Required Libraries:";							\
+	$(MISSING_LIBS)									\
+	echo "**";									\
+	echo "** Consider installing the latest libtracefs from your";			\
+	echo "** distribution, e.g., 'dnf install $(MISSING_PACKAGES)' on Fedora,";	\
+	echo "** or from source:";							\
+	echo "**";									\
+	$(MISSING_SOURCE)								\
+	echo "**";									\
+	echo "********************************************"
+endef
+
+show_warnings:
+	$(call show_dependencies);
+
+ifneq ("$(WARNINGS)", "")
+ERROR_OUT = $(error Please add the necessary dependencies)
+
+warnings: $(WARNINGS)
+	$(ERROR_OUT)
+endif
+
+rv: $(OBJ)
+	$(CC) -o rv $(LDFLAGS) $(OBJ) $(LIBS)
+
+.PHONY: install
+install: doc_install
+	$(MKDIR) -p $(DESTDIR)$(BINDIR)
+	$(INSTALL) rv -m 755 $(DESTDIR)$(BINDIR)
+	$(STRIP) $(DESTDIR)$(BINDIR)/rv
+
+.PHONY: clean tarball
+clean: doc_clean
+	@test ! -f rv || rm rv
+	@test ! -f $(TARBALL) || rm -f $(TARBALL)
+	@rm -rf *~ $(OBJ) *.tar.$(CEXT)
+
+tarball: clean
+	rm -rf $(NAME)-$(VERSION) && mkdir $(NAME)-$(VERSION)
+	echo $(VERSION) > $(NAME)-$(VERSION)/VERSION
+	cp -r $(DIRS) $(FILES) $(NAME)-$(VERSION)
+	mkdir $(NAME)-$(VERSION)/Documentation/
+	cp -rp $(SRCTREE)/../../../Documentation/tools/rv/* $(NAME)-$(VERSION)/Documentation/
+	tar $(TAROPTS) --exclude='*~' $(NAME)-$(VERSION)
+	rm -rf $(NAME)-$(VERSION)
+
+.PHONY: doc doc_clean doc_install
+doc:
+	$(MAKE) -C $(DOCSRC)
+
+doc_clean:
+	$(MAKE) -C $(DOCSRC) clean
+
+doc_install:
+	$(MAKE) -C $(DOCSRC) install
diff --git a/tools/verification/rv/README.txt b/tools/verification/rv/README.txt
new file mode 100644
index 000000000..e96be0dff
--- /dev/null
+++ b/tools/verification/rv/README.txt
@@ -0,0 +1,38 @@
+RV: Runtime Verification
+
+Runtime Verification (RV) is a lightweight (yet rigorous) method that
+complements classical exhaustive verification techniques (such as model
+checking and theorem proving) with a more practical approach for
+complex systems.
+
+The rv tool is the interface for a collection of monitors that aim
+analysing the logical and timing behavior of Linux.
+
+Installing RV
+
+RV depends on the following libraries and tools:
+
+ - libtracefs
+ - libtraceevent
+
+It also depends on python3-docutils to compile man pages.
+
+For development, we suggest the following steps for compiling rtla:
+
+  $ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git
+  $ cd libtraceevent/
+  $ make
+  $ sudo make install
+  $ cd ..
+  $ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git
+  $ cd libtracefs/
+  $ make
+  $ sudo make install
+  $ cd ..
+  $ cd $rv_src
+  $ make
+  $ sudo make install
+
+For further information, please see rv manpage and the kernel documentation:
+  Runtime Verification:
+    Documentation/trace/rv/runtime-verification.rst
diff --git a/tools/verification/rv/include/in_kernel.h b/tools/verification/rv/include/in_kernel.h
new file mode 100644
index 000000000..3090638c8
--- /dev/null
+++ b/tools/verification/rv/include/in_kernel.h
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0
+int ikm_list_monitors(void);
+int ikm_run_monitor(char *monitor, int argc, char **argv);
diff --git a/tools/verification/rv/include/rv.h b/tools/verification/rv/include/rv.h
new file mode 100644
index 000000000..770fd6da3
--- /dev/null
+++ b/tools/verification/rv/include/rv.h
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define MAX_DESCRIPTION 1024
+#define MAX_DA_NAME_LEN	24
+
+struct monitor {
+	char name[MAX_DA_NAME_LEN];
+	char desc[MAX_DESCRIPTION];
+	int enabled;
+};
+
+int should_stop(void);
diff --git a/tools/verification/rv/include/trace.h b/tools/verification/rv/include/trace.h
new file mode 100644
index 000000000..8d89e8c30
--- /dev/null
+++ b/tools/verification/rv/include/trace.h
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <tracefs.h>
+
+struct trace_instance {
+	struct tracefs_instance		*inst;
+	struct tep_handle		*tep;
+	struct trace_seq		*seq;
+};
+
+int trace_instance_init(struct trace_instance *trace, char *name);
+int trace_instance_start(struct trace_instance *trace);
+void trace_instance_destroy(struct trace_instance *trace);
+
+int collect_registered_events(struct tep_event *event, struct tep_record *record,
+			      int cpu, void *context);
diff --git a/tools/verification/rv/include/utils.h b/tools/verification/rv/include/utils.h
new file mode 100644
index 000000000..f24ae8282
--- /dev/null
+++ b/tools/verification/rv/include/utils.h
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define MAX_PATH		1024
+
+void debug_msg(const char *fmt, ...);
+void err_msg(const char *fmt, ...);
+
+extern int config_debug;
diff --git a/tools/verification/rv/src/in_kernel.c b/tools/verification/rv/src/in_kernel.c
new file mode 100644
index 000000000..ad28582bc
--- /dev/null
+++ b/tools/verification/rv/src/in_kernel.c
@@ -0,0 +1,698 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * in kernel monitor support: allows rv to control in-kernel monitors.
+ *
+ * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <trace.h>
+#include <utils.h>
+#include <rv.h>
+
+static int config_has_id;
+static int config_my_pid;
+static int config_trace;
+
+static char *config_initial_reactor;
+static char *config_reactor;
+
+/*
+ * __ikm_read_enable - reads monitor's enable status
+ *
+ * __does not log errors.
+ *
+ * Returns the current status, or -1 if the monitor does not exist,
+ * __hence not logging errors.
+ */
+static int __ikm_read_enable(char *monitor_name)
+{
+	char path[MAX_PATH];
+	long long enabled;
+	int retval;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
+
+	retval = tracefs_instance_file_read_number(NULL, path, &enabled);
+	if (retval < 0)
+		return -1;
+
+	return enabled;
+}
+
+/*
+ * ikm_read_enable - reads monitor's enable status
+ *
+ * Returns the current status, or -1 on error.
+ */
+static int ikm_read_enable(char *monitor_name)
+{
+	int enabled;
+
+	enabled = __ikm_read_enable(monitor_name);
+	if (enabled < 0) {
+		err_msg("ikm: fail read enabled: %d\n", enabled);
+		return -1;
+	}
+
+	debug_msg("ikm: read enabled: %d\n", enabled);
+
+	return enabled;
+}
+
+/*
+ * ikm_write_enable - write to the monitor's enable file
+ *
+ * Return the number of bytes written, -1 on error.
+ */
+static int ikm_write_enable(char *monitor_name, char *enable_disable)
+{
+	char path[MAX_PATH];
+	int retval;
+
+	debug_msg("ikm: writing enabled: %s\n", enable_disable);
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name);
+	retval = tracefs_instance_file_write(NULL, path, enable_disable);
+	if (retval < strlen(enable_disable)) {
+		err_msg("ikm: writing enabled: %s\n", enable_disable);
+		return -1;
+	}
+
+	return retval;
+}
+
+/*
+ * ikm_enable - enable a monitor
+ *
+ * Returns -1 on failure. Success otherwise.
+ */
+static int ikm_enable(char *monitor_name)
+{
+	return ikm_write_enable(monitor_name, "1");
+}
+
+/*
+ * ikm_disable - disable a monitor
+ *
+ * Returns -1 on failure. Success otherwise.
+ */
+static int ikm_disable(char *monitor_name)
+{
+	return ikm_write_enable(monitor_name, "0");
+}
+
+/*
+ * ikm_read_desc - read monitors' description
+ *
+ * Return a dynamically allocated string with the monitor's
+ * description, NULL otherwise.
+ */
+static char *ikm_read_desc(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *desc;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name);
+	desc = tracefs_instance_file_read(NULL, path, NULL);
+	if (!desc) {
+		err_msg("ikm: error reading monitor %s desc\n", monitor_name);
+		return NULL;
+	}
+
+	*strstr(desc, "\n") = '\0';
+
+	return desc;
+}
+
+/*
+ * ikm_fill_monitor_definition - fill monitor's definition
+ *
+ * Returns -1 on error, 0 otherwise.
+ */
+static int ikm_fill_monitor_definition(char *name, struct monitor *ikm)
+{
+	int enabled;
+	char *desc;
+
+	enabled = ikm_read_enable(name);
+	if (enabled < 0) {
+		err_msg("ikm: monitor %s fail to read enable file, bug?\n", name);
+		return -1;
+	}
+
+	desc = ikm_read_desc(name);
+	if (!desc) {
+		err_msg("ikm: monitor %s does not have desc file, bug?\n", name);
+		return -1;
+	}
+
+	strncpy(ikm->name, name, MAX_DA_NAME_LEN);
+	ikm->enabled = enabled;
+	strncpy(ikm->desc, desc, MAX_DESCRIPTION);
+
+	free(desc);
+
+	return 0;
+}
+
+/*
+ * ikm_write_reactor - switch the reactor to *reactor
+ *
+ * Return the number or characters written, -1 on error.
+ */
+static int ikm_write_reactor(char *monitor_name, char *reactor)
+{
+	char path[MAX_PATH];
+	int retval;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
+	retval = tracefs_instance_file_write(NULL, path, reactor);
+	debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval);
+
+	return retval;
+}
+
+/*
+ * ikm_read_reactor - read the reactors file
+ *
+ * Returns a dynamically allocated string with monitor's
+ * available reactors, or NULL on error.
+ */
+static char *ikm_read_reactor(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *reactors;
+
+	snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name);
+	reactors = tracefs_instance_file_read(NULL, path, NULL);
+	if (!reactors) {
+		err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name);
+		return NULL;
+	}
+
+	return reactors;
+}
+
+/*
+ * ikm_get_current_reactor - get the current enabled reactor
+ *
+ * Reads the reactors file and find the currently enabled
+ * [reactor].
+ *
+ * Returns a dynamically allocated memory with the current
+ * reactor. NULL otherwise.
+ */
+static char *ikm_get_current_reactor(char *monitor_name)
+{
+	char *reactors = ikm_read_reactor(monitor_name);
+	char *start;
+	char *end;
+	char *curr_reactor;
+
+	if (!reactors)
+		return NULL;
+
+	start = strstr(reactors, "[");
+	if (!start)
+		goto out_free;
+
+	start++;
+
+	end = strstr(start, "]");
+	if (!end)
+		goto out_free;
+
+	*end = '\0';
+
+	curr_reactor = calloc(strlen(start) + 1, sizeof(char));
+	if (!curr_reactor)
+		goto out_free;
+
+	strncpy(curr_reactor, start, strlen(start));
+	debug_msg("ikm: read current reactor %s\n", curr_reactor);
+
+out_free:
+	free(reactors);
+
+	return curr_reactor;
+}
+
+static int ikm_has_id(char *monitor_name)
+{
+	char path[MAX_PATH];
+	char *format;
+	int has_id;
+
+	snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name);
+	format = tracefs_instance_file_read(NULL, path, NULL);
+	if (!format) {
+		err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name);
+		return -1;
+	}
+
+	/* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */
+	has_id = !!strstr(format, "REC->id");
+
+	debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no");
+
+	free(format);
+
+	return has_id;
+}
+
+/**
+ * ikm_list_monitors - list all available monitors
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int ikm_list_monitors(void)
+{
+	char *available_monitors;
+	struct monitor ikm;
+	char *curr, *next;
+	int retval;
+
+	available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL);
+
+	if (!available_monitors) {
+		err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n");
+		return -1;
+	}
+
+	curr = available_monitors;
+	do {
+		next = strstr(curr, "\n");
+		*next = '\0';
+
+		retval = ikm_fill_monitor_definition(curr, &ikm);
+		if (retval)
+			err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr);
+
+		printf("%-24s %s %s\n", ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]");
+		curr = ++next;
+
+	} while (strlen(curr));
+
+	free(available_monitors);
+
+	return 0;
+}
+
+static void ikm_print_header(struct trace_seq *s)
+{
+	trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE");
+	if (config_has_id)
+		trace_seq_printf(s, "%8s ", "ID");
+
+	trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
+			 "STATE",
+			 "EVENT",
+			 "NEXT_STATE",
+			 "FINAL");
+
+	trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | ");
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8s ", " | ");
+
+	trace_seq_printf(s, "%24s   %-24s    %-24s %s\n",
+			 " | ",
+			 " | ",
+			 " | ",
+			 "|");
+
+}
+
+/*
+ * ikm_event_handler - callback to handle event events
+ *
+ * Called any time a rv:"monitor"_event events is generated.
+ * It parses and print event.
+ */
+static int
+ikm_event_handler(struct trace_seq *s, struct tep_record *record,
+		  struct tep_event *trace_event, void *context)
+{
+	/* if needed: struct trace_instance *inst = context; */
+	char *state, *event, *next_state;
+	unsigned long long final_state;
+	unsigned long long pid;
+	unsigned long long id;
+	int cpu = record->cpu;
+	int val;
+
+	if (config_has_id)
+		tep_get_field_val(s, trace_event, "id", record, &id, 1);
+
+	tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
+
+	if (config_has_id && (config_my_pid == id))
+		return 0;
+	else if (config_my_pid && (config_my_pid == pid))
+		return 0;
+
+	tep_print_event(trace_event->tep, s, record, "%16s-%-8d ", TEP_PRINT_COMM, TEP_PRINT_PID);
+
+	trace_seq_printf(s, "[%.3d] event ", cpu);
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8llu ", id);
+
+	state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
+	event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
+	next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0);
+	tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1);
+
+	trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n",
+			 state,
+			 event,
+			 next_state,
+			 final_state ? "Y" : "N");
+
+	trace_seq_do_printf(s);
+	trace_seq_reset(s);
+
+	return 0;
+}
+
+/*
+ * ikm_error_handler - callback to handle error events
+ *
+ * Called any time a rv:"monitor"_errors events is generated.
+ * It parses and print event.
+ */
+static int
+ikm_error_handler(struct trace_seq *s, struct tep_record *record,
+		  struct tep_event *trace_event, void *context)
+{
+	unsigned long long pid, id;
+	int cpu = record->cpu;
+	char *state, *event;
+	int val;
+
+	if (config_has_id)
+		tep_get_field_val(s, trace_event, "id", record, &id, 1);
+
+	tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1);
+
+	if (config_has_id && config_my_pid == id)
+		return 0;
+	else if (config_my_pid == pid)
+		return 0;
+
+	trace_seq_printf(s, "%8lld [%03d] error ", pid, cpu);
+
+	if (config_has_id)
+		trace_seq_printf(s, "%8llu ", id);
+
+	state = tep_get_field_raw(s, trace_event, "state", record, &val, 0);
+	event = tep_get_field_raw(s, trace_event, "event", record, &val, 0);
+
+	trace_seq_printf(s, "%24s x %s\n", state, event);
+
+	trace_seq_do_printf(s);
+	trace_seq_reset(s);
+
+	return 0;
+}
+
+/*
+ * ikm_setup_trace_instance - set up a tracing instance to collect data
+ *
+ * Create a trace instance, enable rv: events and enable the trace.
+ *
+ * Returns the trace_instance * with all set, NULL otherwise.
+ */
+static struct trace_instance *ikm_setup_trace_instance(char *monitor_name)
+{
+	char event[MAX_DA_NAME_LEN + 7]; /* max(error_,event_) + '0' = 7 */
+	struct trace_instance *inst;
+	int retval;
+
+	if (!config_trace)
+		return NULL;
+
+	config_has_id = ikm_has_id(monitor_name);
+	if (config_has_id < 0) {
+		err_msg("ikm: failed to read monitor %s event format\n", monitor_name);
+		goto out_err;
+	}
+
+	/* alloc data */
+	inst = calloc(1, sizeof(*inst));
+	if (!inst) {
+		err_msg("ikm: failed to allocate trace instance");
+		goto out_err;
+	}
+
+	retval = trace_instance_init(inst, monitor_name);
+	if (retval)
+		goto out_free;
+
+	/* enable events */
+	snprintf(event, sizeof(event), "event_%s", monitor_name);
+	retval = tracefs_event_enable(inst->inst, "rv",  event);
+	if (retval)
+		goto out_inst;
+
+	tep_register_event_handler(inst->tep, -1, "rv", event,
+				   ikm_event_handler, NULL);
+
+	snprintf(event, sizeof(event), "error_%s", monitor_name);
+	retval = tracefs_event_enable(inst->inst, "rv", event);
+	if (retval)
+		goto out_inst;
+
+	tep_register_event_handler(inst->tep, -1, "rv", event,
+				   ikm_error_handler, NULL);
+
+	/* ready to enable */
+	tracefs_trace_on(inst->inst);
+
+	return inst;
+
+out_inst:
+	trace_instance_destroy(inst);
+out_free:
+	free(inst);
+out_err:
+	return NULL;
+}
+
+/**
+ * ikm_destroy_trace_instance - destroy a previously created instance
+ */
+static void ikm_destroy_trace_instance(struct trace_instance *inst)
+{
+	if (!inst)
+		return;
+
+	trace_instance_destroy(inst);
+	free(inst);
+}
+
+/*
+ * ikm_usage_print_reactors - print all available reactors, one per line.
+ */
+static void ikm_usage_print_reactors(void)
+{
+	char *reactors = tracefs_instance_file_read(NULL, "rv/available_reactors", NULL);
+	char *start, *end;
+
+	if (!reactors)
+		return;
+
+	fprintf(stderr, "  available reactors:");
+
+	start = reactors;
+	end = strstr(start, "\n");
+
+	while (end) {
+		*end = '\0';
+
+		fprintf(stderr, " %s", start);
+
+		start = ++end;
+		end = strstr(start, "\n");
+	}
+
+	fprintf(stderr, "\n");
+}
+/*
+ * ikm_usage - print usage
+ */
+static void ikm_usage(int exit_val, char *monitor_name, const char *fmt, ...)
+{
+
+	char message[1024];
+	va_list ap;
+	int i;
+
+	static const char *const usage[] = {
+		"",
+		"	-h/--help: print this menu and the reactor list",
+		"	-r/--reactor 'reactor': enables the 'reactor'",
+		"	-s/--self: when tracing (-t), also trace rv command",
+		"	-t/--trace: trace monitor's event",
+		"	-v/--verbose: print debug messages",
+		"",
+		NULL,
+	};
+
+	va_start(ap, fmt);
+	vsnprintf(message, sizeof(message), fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "  %s\n", message);
+
+	fprintf(stderr, "\n  usage: rv mon %s [-h] [-q] [-r reactor] [-s] [-v]", monitor_name);
+
+	for (i = 0; usage[i]; i++)
+		fprintf(stderr, "%s\n", usage[i]);
+
+	ikm_usage_print_reactors();
+	exit(exit_val);
+}
+
+/*
+ * parse_arguments - parse arguments and set config
+ */
+static int parse_arguments(char *monitor_name, int argc, char **argv)
+{
+	int c, retval;
+
+	config_my_pid = getpid();
+
+	while (1) {
+		static struct option long_options[] = {
+			{"help",		no_argument,		0, 'h'},
+			{"reactor",		required_argument,	0, 'r'},
+			{"self",		no_argument,		0, 's'},
+			{"trace",		no_argument,		0, 't'},
+			{"verbose",		no_argument,		0, 'v'},
+			{0, 0, 0, 0}
+		};
+
+		/* getopt_long stores the option index here. */
+		int option_index = 0;
+
+		c = getopt_long(argc, argv, "hr:stv", long_options, &option_index);
+
+		/* detect the end of the options. */
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			ikm_usage(0, monitor_name, "help:");
+			break;
+		case 'r':
+			config_reactor = optarg;
+			break;
+		case 's':
+			config_my_pid = 0;
+			break;
+		case 't':
+			config_trace = 1;
+			break;
+		case 'v':
+			config_debug = 1;
+			break;
+		}
+	}
+
+	if (config_reactor) {
+		config_initial_reactor = ikm_get_current_reactor(monitor_name);
+		if (!config_initial_reactor)
+			ikm_usage(1, monitor_name,
+				  "ikm: failed to read current reactor, are reactors enabled?");
+
+		retval = ikm_write_reactor(monitor_name, config_reactor);
+		if (retval <= 0)
+			ikm_usage(1, monitor_name,
+				  "ikm: failed to set %s reactor, is it available?",
+				  config_reactor);
+	}
+
+	debug_msg("ikm: my pid is %d\n", config_my_pid);
+
+	return 0;
+}
+
+/**
+ * ikm_run_monitor - apply configs and run the monitor
+ *
+ * Returns 1 if a monitor was found an executed, 0 if no
+ * monitors were found, or -1 on error.
+ */
+int ikm_run_monitor(char *monitor_name, int argc, char **argv)
+{
+	struct trace_instance *inst = NULL;
+	int retval;
+
+	/*
+	 * Check if monitor exists by seeing it is enabled.
+	 */
+	retval = __ikm_read_enable(monitor_name);
+	if (retval < 0)
+		return 0;
+
+	if (retval) {
+		err_msg("ikm: monitor %s (in-kernel) is already enabled\n", monitor_name);
+		return -1;
+	}
+
+	/* we should be good to go */
+	retval = parse_arguments(monitor_name, argc, argv);
+	if (retval)
+		ikm_usage(1, monitor_name, "ikm: failed parsing arguments");
+
+	if (config_trace) {
+		inst = ikm_setup_trace_instance(monitor_name);
+		if (!inst)
+			return -1;
+	}
+
+	retval = ikm_enable(monitor_name);
+	if (retval < 0)
+		goto out_free_instance;
+
+	if (config_trace)
+		ikm_print_header(inst->seq);
+
+	while (!should_stop()) {
+		if (config_trace) {
+			retval = tracefs_iterate_raw_events(inst->tep,
+							    inst->inst,
+							    NULL,
+							    0,
+							    collect_registered_events,
+							    inst);
+			if (retval) {
+				err_msg("ikm: error reading trace buffer\n");
+				break;
+			}
+		}
+
+		sleep(1);
+	}
+
+	ikm_disable(monitor_name);
+	ikm_destroy_trace_instance(inst);
+
+	if (config_reactor && config_initial_reactor)
+		ikm_write_reactor(monitor_name, config_initial_reactor);
+
+	return 1;
+
+out_free_instance:
+	ikm_destroy_trace_instance(inst);
+	if (config_reactor && config_initial_reactor)
+		ikm_write_reactor(monitor_name, config_initial_reactor);
+	return -1;
+}
diff --git a/tools/verification/rv/src/rv.c b/tools/verification/rv/src/rv.c
new file mode 100644
index 000000000..1ddb85532
--- /dev/null
+++ b/tools/verification/rv/src/rv.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rv tool, the interface for the Linux kernel RV subsystem and home of
+ * user-space controlled monitors.
+ *
+ * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+#include <stdlib.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <trace.h>
+#include <utils.h>
+#include <in_kernel.h>
+
+static int stop_session;
+
+/*
+ * stop_rv - tell monitors to stop
+ */
+static void stop_rv(int sig)
+{
+	stop_session = 1;
+}
+
+/**
+ * should_stop - check if the monitor should stop.
+ *
+ * Returns 1 if the monitor should stop, 0 otherwise.
+ */
+int should_stop(void)
+{
+	return stop_session;
+}
+
+/*
+ * rv_list - list all available monitors
+ */
+static void rv_list(int argc, char **argv)
+{
+	static const char *const usage[] = {
+		"",
+		"  usage: rv list [-h]",
+		"",
+		"	list all available monitors",
+		"",
+		"	-h/--help: print this menu",
+		NULL,
+	};
+	int i;
+
+	if (argc > 1) {
+		fprintf(stderr, "rv version %s\n", VERSION);
+
+		/* more than 1 is always usage */
+		for (i = 0; usage[i]; i++)
+			fprintf(stderr, "%s\n", usage[i]);
+
+		/* but only -h is valid */
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
+			exit(0);
+		else
+			exit(1);
+	}
+
+	ikm_list_monitors();
+	exit(0);
+}
+
+/*
+ * rv_mon - try to run a monitor passed as argument
+ */
+static void rv_mon(int argc, char **argv)
+{
+	char *monitor_name;
+	int i, run = 0;
+
+	static const char *const usage[] = {
+		"",
+		"  usage: rv mon [-h] monitor [monitor options]",
+		"",
+		"	run a monitor",
+		"",
+		"	-h/--help: print this menu",
+		"",
+		"	monitor [monitor options]: the monitor, passing",
+		"	the arguments to the [monitor options]",
+		NULL,
+	};
+
+	/* requires at least one argument */
+	if (argc == 1) {
+
+		fprintf(stderr, "rv version %s\n", VERSION);
+
+		for (i = 0; usage[i]; i++)
+			fprintf(stderr, "%s\n", usage[i]);
+		exit(1);
+	} else if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
+
+		fprintf(stderr, "rv version %s\n", VERSION);
+
+		for (i = 0; usage[i]; i++)
+			fprintf(stderr, "%s\n", usage[i]);
+		exit(0);
+	}
+
+	monitor_name = argv[1];
+	/*
+	 * Call all possible monitor implementations, looking
+	 * for the [monitor].
+	 */
+	run += ikm_run_monitor(monitor_name, argc-1, &argv[1]);
+
+	if (!run)
+		err_msg("rv: monitor %s does not exist\n", monitor_name);
+	exit(!run);
+}
+
+static void usage(int exit_val, const char *fmt, ...)
+{
+	char message[1024];
+	va_list ap;
+	int i;
+
+	static const char *const usage[] = {
+		"",
+		"  usage: rv command [-h] [command_options]",
+		"",
+		"	-h/--help: print this menu",
+		"",
+		"	command: run one of the following command:",
+		"	  list: list all available monitors",
+		"	  mon:  run a monitor",
+		"",
+		"	[command options]: each command has its own set of options",
+		"		           run rv command -h for further information",
+		NULL,
+	};
+
+	va_start(ap, fmt);
+	vsnprintf(message, sizeof(message), fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "rv version %s: %s\n", VERSION, message);
+
+	for (i = 0; usage[i]; i++)
+		fprintf(stderr, "%s\n", usage[i]);
+
+	exit(exit_val);
+}
+
+/*
+ * main - select which main sending the command
+ *
+ * main itself redirects the arguments to the sub-commands
+ * to handle the options.
+ *
+ * subcommands should exit.
+ */
+int main(int argc, char **argv)
+{
+	if (geteuid())
+		usage(1, "%s needs root permission", argv[0]);
+
+	if (argc <= 1)
+		usage(1, "%s requires a command", argv[0]);
+
+	if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
+		usage(0, "help");
+
+	if (!strcmp(argv[1], "list"))
+		rv_list(--argc, &argv[1]);
+
+	if (!strcmp(argv[1], "mon")) {
+		/*
+		 * monitor's main should monitor should_stop() function.
+		 * and exit.
+		 */
+		signal(SIGINT, stop_rv);
+
+		rv_mon(argc - 1, &argv[1]);
+	}
+
+	/* invalid sub-command */
+	usage(1, "%s does not know the %s command, old version?", argv[0], argv[1]);
+}
diff --git a/tools/verification/rv/src/trace.c b/tools/verification/rv/src/trace.c
new file mode 100644
index 000000000..2c7deed47
--- /dev/null
+++ b/tools/verification/rv/src/trace.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * trace helpers.
+ *
+ * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+#include <sys/sendfile.h>
+#include <tracefs.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <rv.h>
+#include <trace.h>
+#include <utils.h>
+
+/*
+ * create_instance - create a trace instance with *instance_name
+ */
+static struct tracefs_instance *create_instance(char *instance_name)
+{
+	return tracefs_instance_create(instance_name);
+}
+
+/*
+ * destroy_instance - remove a trace instance and free the data
+ */
+static void destroy_instance(struct tracefs_instance *inst)
+{
+	tracefs_instance_destroy(inst);
+	tracefs_instance_free(inst);
+}
+
+/**
+ * collect_registered_events - call the existing callback function for the event
+ *
+ * If an event has a registered callback function, call it.
+ * Otherwise, ignore the event.
+ *
+ * Returns 0 if the event was collected, 1 if the tool should stop collecting trace.
+ */
+int
+collect_registered_events(struct tep_event *event, struct tep_record *record,
+			  int cpu, void *context)
+{
+	struct trace_instance *trace = context;
+	struct trace_seq *s = trace->seq;
+
+	if (should_stop())
+		return 1;
+
+	if (!event->handler)
+		return 0;
+
+	event->handler(s, record, event, context);
+
+	return 0;
+}
+
+/**
+ * trace_instance_destroy - destroy and free a rv trace instance
+ */
+void trace_instance_destroy(struct trace_instance *trace)
+{
+	if (trace->inst) {
+		destroy_instance(trace->inst);
+		trace->inst = NULL;
+	}
+
+	if (trace->seq) {
+		free(trace->seq);
+		trace->seq = NULL;
+	}
+
+	if (trace->tep) {
+		tep_free(trace->tep);
+		trace->tep = NULL;
+	}
+}
+
+/**
+ * trace_instance_init - create an trace instance
+ *
+ * It is more than the tracefs instance, as it contains other
+ * things required for the tracing, such as the local events and
+ * a seq file.
+ *
+ * Note that the trace instance is returned disabled. This allows
+ * the tool to apply some other configs, like setting priority
+ * to the kernel threads, before starting generating trace entries.
+ *
+ * Returns 0 on success, non-zero otherwise.
+ */
+int trace_instance_init(struct trace_instance *trace, char *name)
+{
+	trace->seq = calloc(1, sizeof(*trace->seq));
+	if (!trace->seq)
+		goto out_err;
+
+	trace_seq_init(trace->seq);
+
+	trace->inst = create_instance(name);
+	if (!trace->inst)
+		goto out_err;
+
+	trace->tep = tracefs_local_events(NULL);
+	if (!trace->tep)
+		goto out_err;
+
+	/*
+	 * Let the main enable the record after setting some other
+	 * things such as the priority of the tracer's threads.
+	 */
+	tracefs_trace_off(trace->inst);
+
+	return 0;
+
+out_err:
+	trace_instance_destroy(trace);
+	return 1;
+}
+
+/**
+ * trace_instance_start - start tracing a given rv instance
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int trace_instance_start(struct trace_instance *trace)
+{
+	return tracefs_trace_on(trace->inst);
+}
diff --git a/tools/verification/rv/src/utils.c b/tools/verification/rv/src/utils.c
new file mode 100644
index 000000000..5677b439d
--- /dev/null
+++ b/tools/verification/rv/src/utils.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * util functions.
+ *
+ * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <utils.h>
+
+int config_debug;
+
+#define MAX_MSG_LENGTH	1024
+
+/**
+ * err_msg - print an error message to the stderr
+ */
+void err_msg(const char *fmt, ...)
+{
+	char message[MAX_MSG_LENGTH];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(message, sizeof(message), fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "%s", message);
+}
+
+/**
+ * debug_msg - print a debug message to stderr if debug is set
+ */
+void debug_msg(const char *fmt, ...)
+{
+	char message[MAX_MSG_LENGTH];
+	va_list ap;
+
+	if (!config_debug)
+		return;
+
+	va_start(ap, fmt);
+	vsnprintf(message, sizeof(message), fmt, ap);
+	va_end(ap);
+
+	fprintf(stderr, "%s", message);
+}