tests: reduce maxmem of HVM when running in nested virt

qubes/tests/__init__.py

@@ -921,6 +921,21 @@ def close_qdb_on_remove(self, app, event, vm, **kwargs):
             vm._qdb_connection_watch.close()
             vm._qdb_connection_watch = None
 
+    @staticmethod
+    def set_hvm(vm):
+        vm.virt_mode = "hvm"
+        # when running test in nested virt, set lower maxmem to workaround
+        # https://github.com/QubesOS/qubes-issues/issues/10723
+        qemu = False
+        try:
+            with open("/sys/firmware/dmi/entries/1-0/raw", "rb") as f:
+                if b"QEMU" in f.read():
+                    qemu = True
+        except OSError:
+            pass
+        if qemu:
+            vm.maxmem = 1024
+
     def cleanup_app(self):
         self.remove_test_vms()
 

qubes/tests/extra.py

@@ -64,6 +64,8 @@ def __getattr__(self, item):
     def __setattr__(self, key, value):
         if key.startswith("_"):
             return super(VMWrapper, self).__setattr__(key, value)
+        if key == "virt_mode" and value == "hvm":
+            qubes.tests.SystemTestCase.set_hvm(self._vm)
         return setattr(self._vm, key, value)
 
     def __str__(self):

qubes/tests/integ/audio.py

@@ -606,7 +606,7 @@ def test_222_audio_rec_unmuted_pulseaudio(self):
         "pulseaudio-utils not installed in dom0",
     )
     def test_223_audio_play_hvm(self):
-        self.testvm1.virt_mode = "hvm"
+        self.set_hvm(self.testvm1)
         self.testvm1.features["audio-model"] = "ich6"
         self.prepare_audio_test("pulseaudio")
         try:
@@ -625,7 +625,7 @@ def test_223_audio_play_hvm(self):
         "pulseaudio-utils not installed in dom0",
     )
     def test_224_audio_rec_muted_hvm(self):
-        self.testvm1.virt_mode = "hvm"
+        self.set_hvm(self.testvm1)
         self.testvm1.features["audio-model"] = "ich6"
         self.prepare_audio_test("pulseaudio")
         try:
@@ -647,7 +647,7 @@ def test_224_audio_rec_muted_hvm(self):
         "pulseaudio-utils not installed in dom0",
     )
     def test_225_audio_rec_unmuted_hvm(self):
-        self.testvm1.virt_mode = "hvm"
+        self.set_hvm(self.testvm1)
         self.testvm1.features["audio-model"] = "ich6"
         self.prepare_audio_test("pulseaudio")
         pa_info = self.loop.run_until_complete(
@@ -683,7 +683,7 @@ def test_225_audio_rec_unmuted_hvm(self):
     def test_252_audio_playback_audiovm_switch_hvm(self):
         self.create_audio_vm("pulseaudio")
         self.testvm1.audiovm = self.audiovm
-        self.testvm1.virt_mode = "hvm"
+        self.set_hvm(self.testvm1)
         self.testvm1.features["audio-model"] = "ich6"
         self.testvm1.features["stubdom-qrexec"] = "1"
         self.prepare_audio_test("pulseaudio")

qubes/tests/integ/grub.py

@@ -140,6 +140,8 @@ def test_000_standalone_vm(self):
             "StandaloneVM", name=self.make_vm_name("vm1"), label="red"
         )
         self.testvm1.virt_mode = self.virt_mode
+        if self.virt_mode == "hvm":
+            self.set_hvm(self.testvm1)
         self.testvm1.features.update(self.app.domains[self.template].features)
         self.testvm1.clone_properties(self.app.domains[self.template])
         self.loop.run_until_complete(