@@ -41,6 +41,7 @@ class S390CPUTopology(QemuSystemTest):
The polarization is changed on a request from the guest.
"""
timeout = 90
+ event_timeout = 10
KERNEL_COMMON_COMMAND_LINE = ('printk.time=0 '
'root=/dev/ram '
@@ -103,6 +104,14 @@ def kernel_init(self):
'-initrd', initrd_path,
'-append', kernel_command_line)
+ def system_init(self):
+ self.log.info("System init")
+ exec_command_and_wait_for_pattern(self,
+ """ mount proc -t proc /proc;
+ mount sys -t sysfs /sys;
+ cat /sys/devices/system/cpu/dispatching """,
+ '0')
+
def test_single(self):
"""
This test checks the simplest topology with a single CPU.
@@ -198,3 +207,39 @@ def test_dash_device(self):
self.check_topology(3, 1, 1, 1, 'high', False)
self.check_topology(4, 1, 1, 1, 'medium', False)
self.check_topology(5, 2, 1, 1, 'high', True)
+
+
+ def guest_set_dispatching(self, dispatching):
+ exec_command(self,
+ f'echo {dispatching} > /sys/devices/system/cpu/dispatching')
+ self.vm.event_wait('CPU_POLARIZATION_CHANGE', self.event_timeout)
+ exec_command_and_wait_for_pattern(self,
+ 'cat /sys/devices/system/cpu/dispatching', dispatching)
+
+
+ def test_polarization(self):
+ """
+ This test verifies that QEMU modifies the entitlement change after
+ several guest polarization change requests.
+
+ :avocado: tags=arch:s390x
+ :avocado: tags=machine:s390-ccw-virtio
+ """
+ self.kernel_init()
+ self.vm.launch()
+ self.wait_until_booted()
+
+ self.system_init()
+ res = self.vm.qmp('query-s390x-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'horizontal')
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ self.guest_set_dispatching('1');
+ res = self.vm.qmp('query-s390x-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'vertical')
+ self.check_topology(0, 0, 0, 0, 'medium', False)
+
+ self.guest_set_dispatching('0');
+ res = self.vm.qmp('query-s390x-cpu-polarization')
+ self.assertEqual(res['return']['polarization'], 'horizontal')
+ self.check_topology(0, 0, 0, 0, 'medium', False)