Workaround a bug with KVM, Qemu >= 2.4 and Intel CPU

Fix #685

gns3server/modules/qemu/qemu_vm.py

@@ -1424,6 +1424,11 @@ class QemuVM(BaseVM):
         command.extend(["-smp", "cpus={}".format(self._cpus)])
         if self._run_with_kvm(self.qemu_path, self._options):
             command.extend(["-enable-kvm"])
+            version = yield from self.manager.get_qemu_version(self.qemu_path)
+            # Issue on some combo Intel CPU + KVM + Qemu 2.4.0
+            # https://github.com/GNS3/gns3-server/issues/685
+            if version and parse_version(version) >= parse_version("2.4.0"):
+                command.extend(["-machine smm=off"])
         command.extend(["-boot", "order={}".format(self._boot_priority)])
         cdrom_option = self._cdrom_option()
         command.extend(cdrom_option)

tests/modules/qemu/test_qemu_vm.py

@@ -22,7 +22,7 @@ import os
 import sys
 import stat
 import re
-from tests.utils import asyncio_patch
+from tests.utils import asyncio_patch, AsyncioMagicMock
 
 
 from unittest import mock
@@ -434,6 +434,65 @@ def test_build_command(vm, loop, fake_qemu_binary, port_manager):
         ]
 
 
+def test_build_command_kvm(linux_platform, vm, loop, fake_qemu_binary, port_manager):
+    """
+    Qemu 2.4 introduce an issue with KVM
+    """
+    vm._run_with_kvm = MagicMock(return_value=True)
+    vm.manager.get_qemu_version = AsyncioMagicMock(return_value="2.3.2")
+    os.environ["DISPLAY"] = "0:0"
+    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
+        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))
+        assert cmd == [
+            fake_qemu_binary,
+            "-name",
+            "test",
+            "-m",
+            "256M",
+            "-smp",
+            "cpus=1",
+            "-enable-kvm",
+            "-boot",
+            "order=c",
+            "-serial",
+            "telnet:127.0.0.1:{},server,nowait".format(vm.console),
+            "-net",
+            "none",
+            "-device",
+            "e1000,mac={}".format(vm._mac_address)
+        ]
+
+
+def test_build_command_kvm_2_4(linux_platform, vm, loop, fake_qemu_binary, port_manager):
+    """
+    Qemu 2.4 introduce an issue with KVM
+    """
+    vm._run_with_kvm = MagicMock(return_value=True)
+    vm.manager.get_qemu_version = AsyncioMagicMock(return_value="2.4.2")
+    os.environ["DISPLAY"] = "0:0"
+    with asyncio_patch("asyncio.create_subprocess_exec", return_value=MagicMock()) as process:
+        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))
+        assert cmd == [
+            fake_qemu_binary,
+            "-name",
+            "test",
+            "-m",
+            "256M",
+            "-smp",
+            "cpus=1",
+            "-enable-kvm",
+            "-machine smm=off",
+            "-boot",
+            "order=c",
+            "-serial",
+            "telnet:127.0.0.1:{},server,nowait".format(vm.console),
+            "-net",
+            "none",
+            "-device",
+            "e1000,mac={}".format(vm._mac_address)
+        ]
+
+
 @pytest.mark.skipif(sys.platform.startswith("win"), reason="Not supported on Windows")
 def test_build_command_without_display(vm, loop, fake_qemu_binary):