Add various print flags to selectively print outputs on terminal based
on test execution status (passed, failed, timed out, skipped, no run).

For each status provide further options (off, full, stderr, stdout,
status) to choose verbosity of their prints. Make "full" the default
choice.

Example: To print stderr for the failed tests and only status for the
passed test:

   python3 runner --test-dirs tests  --print-failed stderr \
   --print-passed status

Above command with disable print off skipped, timed out, and no run
tests.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 .../testing/selftests/kvm/runner/__main__.py  | 45 +++++++++++++++++++
 .../selftests/kvm/runner/test_runner.py       | 19 ++++++--
 2 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/kvm/runner/__main__.py b/tools/testing/selftests/kvm/runner/__main__.py
index b98f72c9f7ee..4867e89c30f2 100644
--- a/tools/testing/selftests/kvm/runner/__main__.py
+++ b/tools/testing/selftests/kvm/runner/__main__.py
@@ -9,6 +9,7 @@ import os
 import sys
 import datetime
 import pathlib
+import textwrap
 
 from test_runner import TestRunner
 from selftest import SelftestStatus
@@ -60,6 +61,50 @@ def cli():
                         type=int,
                         help="Maximum number of tests that can be run concurrently. (Default: 1)")
 
+    status_choices = ["off", "full", "stdout", "stderr", "status"]
+    status_help_text = textwrap.dedent('''\
+                        Control output of the {} test.
+                        off   : dont print anything.
+                        full  : print stdout, stderr, and status of the test.
+                        stdout: print stdout and status of the test.
+                        stderr: print stderr and status of the test.
+                        status: only print the status of test execution and no other output.''');
+
+    parser.add_argument("--print-passed",
+                        default="full",
+                        const="full",
+                        nargs='?',
+                        choices=status_choices,
+                        help = status_help_text.format("passed"))
+
+    parser.add_argument("--print-failed",
+                        default="full",
+                        const="full",
+                        nargs='?',
+                        choices=status_choices,
+                        help = status_help_text.format("failed"))
+
+    parser.add_argument("--print-skipped",
+                        default="full",
+                        const="full",
+                        nargs='?',
+                        choices=status_choices,
+                        help = status_help_text.format("skipped"))
+
+    parser.add_argument("--print-timed-out",
+                        default="full",
+                        const="full",
+                        nargs='?',
+                        choices=status_choices,
+                        help = status_help_text.format("timed-out"))
+
+    parser.add_argument("--print-no-run",
+                        default="full",
+                        const="full",
+                        nargs='?',
+                        choices=status_choices,
+                        help = status_help_text.format("no-run"))
+
     return parser.parse_args()
 
 
diff --git a/tools/testing/selftests/kvm/runner/test_runner.py b/tools/testing/selftests/kvm/runner/test_runner.py
index 92eec18fe5c6..e8e8fd91c1ad 100644
--- a/tools/testing/selftests/kvm/runner/test_runner.py
+++ b/tools/testing/selftests/kvm/runner/test_runner.py
@@ -17,6 +17,13 @@ class TestRunner:
         self.tests = []
         self.output_dir = args.output
         self.jobs = args.jobs
+        self.print_stds = {
+            SelftestStatus.PASSED: args.print_passed,
+            SelftestStatus.FAILED: args.print_failed,
+            SelftestStatus.SKIPPED: args.print_skipped,
+            SelftestStatus.TIMED_OUT: args.print_timed_out,
+            SelftestStatus.NO_RUN: args.print_no_run
+        }
 
         for testcase in testcases:
             self.tests.append(Selftest(testcase, args.path, args.timeout,
@@ -27,10 +34,14 @@ class TestRunner:
         return test
 
     def _log_result(self, test_result):
-        logger.info("*** stdout ***\n" + test_result.stdout)
-        logger.info("*** stderr ***\n" + test_result.stderr)
-        logger.log(test_result.status,
-                   f"[{test_result.status.name}] {test_result.test_path}")
+        print_level = self.print_stds.get(test_result.status, "full")
+
+        if (print_level == "full" or print_level == "stdout"):
+            logger.info("*** stdout ***\n" + test_result.stdout)
+        if (print_level == "full" or print_level == "stderr"):
+            logger.info("*** stderr ***\n" + test_result.stderr)
+        if (print_level != "off"):
+            logger.log(test_result.status, f"[{test_result.status.name}] {test_result.test_path}")
 
     def start(self):
         ret = 0
-- 
2.51.0.618.g983fd99d29-goog