[dts][PATCH V1 1/2] framework/qemu_kvm: support pin VM's thread to vhost CPU lcore

[Wei Ling <weix.ling@intel.com>]

Support pin VM's thread to vhost CPU lcore.

Signed-off-by: Wei Ling <weix.ling@intel.com>
---
 framework/qemu_kvm.py | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/framework/qemu_kvm.py b/framework/qemu_kvm.py
index 20aa8008..d4f67e30 100644
--- a/framework/qemu_kvm.py
+++ b/framework/qemu_kvm.py
@@ -1365,7 +1365,7 @@ class QEMUKvm(VirtBase):
 
             self.migrate_port = int(m.group(1))
 
-    def _start_vm(self):
+    def _start_vm(self, pin_threads=True):
         """
         Start VM.
         """
@@ -1377,6 +1377,11 @@ class QEMUKvm(VirtBase):
 
         self.__get_pci_mapping()
 
+        # pin VM threads with host CPU cores
+        if pin_threads:
+            lcores = self.vcpus_pinned_to_vm.split(" ")
+            self.pin_threads(lcores=lcores)
+
         # query status
         self.update_status()
 
@@ -1385,7 +1390,7 @@ class QEMUKvm(VirtBase):
 
         # when vm is waiting for migration, can't ping
         if self.vm_status is not ST_PAUSE:
-            self.__wait_vm_ready()
+            self.__wait_vm_ready(pin_threads=pin_threads)
 
             self.__wait_vmnet_ready()
 
@@ -1445,7 +1450,7 @@ class QEMUKvm(VirtBase):
 
         return logged_in
 
-    def __wait_vm_ready(self):
+    def __wait_vm_ready(self, pin_threads=True):
         logged_in = self.__ping_vm()
         if not logged_in:
             if not self.restarted:
@@ -1454,7 +1459,7 @@ class QEMUKvm(VirtBase):
                 self.vm_status = ST_NOTSTART
                 self._stop_vm()
                 self.restarted = True
-                self._start_vm()
+                self._start_vm(pin_threads=pin_threads)
             else:
                 raise StartVMFailedException(
                     "Not response in %d seconds!!!" % self.START_TIMEOUT
@@ -2005,12 +2010,11 @@ class QEMUKvm(VirtBase):
         """
         Pin thread to assigned cores
         """
-        thread_reg = r"CPU #(\d+): .* thread_id=(\d+)"
+        thread_reg = r"CPU #\d+: thread_id=(\d+)"
         output = self.__monitor_session("info", "cpus")
-        thread_cores = re.findall(thread_reg, output)
-        cores_map = list(zip(thread_cores, lcores))
-        for thread_info, core_id in cores_map:
-            cpu_id, thread_id = thread_info
+        threads = re.findall(thread_reg, output)
+        map = list(zip(lcores, threads))
+        for lcore, thread in map:
             self.host_session.send_expect(
-                "taskset -pc %d %s" % (core_id, thread_id), "#"
+                "taskset -pc %s %s" % (lcore, thread), "#"
             )
-- 
2.25.1