T7397: add "system kernel option quiet" to suppress boot messages

interface-definitions/system_option.xml.in

@@ -69,6 +69,12 @@
                   </valueHelp>
                 </properties>
               </leafNode>
+              <leafNode name="quiet">
+                <properties>
+                  <help>Disable most log messages</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
               <node name="debug">
                 <properties>
                   <help>Dynamic debugging for kernel module</help>

smoketest/scripts/cli/test_system_option.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2024 VyOS maintainers and contributors
+# Copyright (C) 2024-2025 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -16,14 +16,18 @@
 
 import os
 import unittest
+
 from base_vyostest_shim import VyOSUnitTestSHIM
+
+from vyos.configsession import ConfigSessionError
+from vyos.utils.cpu import get_cpus
 from vyos.utils.file import read_file
 from vyos.utils.process import is_systemd_service_active
 from vyos.utils.system import sysctl_read
+from vyos.system import image
 
 base_path = ['system', 'option']
 
-
 class TestSystemOption(VyOSUnitTestSHIM.TestCase):
     def tearDown(self):
         self.cli_delete(base_path)
@@ -96,6 +100,30 @@ def test_ssh_client_options(self):
         self.cli_commit()
         self.assertFalse(os.path.exists(ssh_client_opt_file))
 
+    def test_kernel_options(self):
+        amd_pstate_mode = 'active'
+
+        self.cli_set(['system', 'option', 'kernel', 'disable-mitigations'])
+        self.cli_set(['system', 'option', 'kernel', 'disable-power-saving'])
+        self.cli_set(['system', 'option', 'kernel', 'quiet'])
+
+        self.cli_set(['system', 'option', 'kernel', 'amd-pstate-driver', amd_pstate_mode])
+        cpu_vendor = get_cpus()[0]['vendor_id']
+        if cpu_vendor != 'AuthenticAMD':
+            with self.assertRaises(ConfigSessionError):
+                self.cli_commit()
+            self.cli_delete(['system', 'option', 'kernel', 'amd-pstate-driver'])
+
+        self.cli_commit()
+
+        # Read GRUB config file for current running image
+        tmp = read_file(f'{image.grub.GRUB_DIR_VYOS_VERS}/{image.get_running_image()}.cfg')
+        self.assertIn(' mitigations=off', tmp)
+        self.assertIn(' intel_idle.max_cstate=0 processor.max_cstate=1', tmp)
+        self.assertIn(' quiet', tmp)
+
+        if cpu_vendor == 'AuthenticAMD':
+            self.assertIn(f' initcall_blacklist=acpi_cpufreq_init amd_pstate={amd_pstate_mode}', tmp)
 
 if __name__ == '__main__':
     unittest.main(verbosity=2)

smoketest/scripts/system/test_kernel_options.py

@@ -134,5 +134,14 @@ def test_psample_enabled(self):
             tmp = re.findall(f'{option}=y', self._config_data)
             self.assertTrue(tmp)
 
+    def test_amd_pstate(self):
+        # AMD pstate driver required as we have "set system option kernel amd-pstate-driver"
+        for option in ['CONFIG_X86_AMD_PSTATE']:
+            tmp = re.findall(f'{option}=y', self._config_data)
+            self.assertTrue(tmp)
+        for option in ['CONFIG_X86_AMD_PSTATE_DEFAULT_MODE']:
+            tmp = re.findall(f'{option}=3', self._config_data)
+            self.assertTrue(tmp)
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)

src/conf_mode/system_option.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2019-2024 VyOS maintainers and contributors
+# Copyright (C) 2019-2025 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -136,6 +136,8 @@ def generate(options):
             mode = options['kernel']['amd_pstate_driver']
             cmdline_options.append(
                 f'initcall_blacklist=acpi_cpufreq_init amd_pstate={mode}')
+        if 'quiet' in options['kernel']:
+            cmdline_options.append('quiet')
     grub_util.update_kernel_cmdline_options(' '.join(cmdline_options))
 
     return None

src/op_mode/image_installer.py

@@ -504,6 +504,8 @@ def get_cli_kernel_options(config_file: str) -> list:
         mode = kernel_options['amd-pstate-driver']
         cmdline_options.append(
             f'initcall_blacklist=acpi_cpufreq_init amd_pstate={mode}')
+    if 'quiet' in kernel_options:
+        cmdline_options.append('quiet')
 
     return cmdline_options