fix: fail physical counter test if phy counter reg isn't in snapshot

Right now the test would pass on stock AL kernels, because without the
commits from 6.4 [1]  backported the CNTPCT_EL0 register won't even be
included in the snapshot, and thus the assert is never reached.

Fix this by failing the test if the register isnt found.

[1]: https://lore.kernel.org/all/[email protected]/

Fixes: 525e686
Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/functional/test_snapshot_basic.py

@@ -552,7 +552,7 @@ def test_vmgenid(guest_kernel_linux_6_1, rootfs, microvm_factory, snapshot_type)
     platform.machine() != "aarch64" or global_props.host_linux_version_tpl < (6, 4),
     reason="This is aarch64 specific test and should only be run on 6.4 and later kernels",
 )
-def test_physical_couter_reset_aarch64(uvm_nano):
+def test_physical_counter_reset_aarch64(uvm_nano):
     """
     Test that the CNTPCT_EL0 register is reset on VM boot.
     We assume the smallest VM will not consume more than
@@ -597,3 +597,6 @@ def test_physical_couter_reset_aarch64(uvm_nano):
             reg_id, reg_value = parts
             if reg_id == cntpct_el0:
                 assert int(reg_value, 16) < max_value
+                break
+    else:
+        raise Exception("Did not find CNTPCT_EL0 register in snapshot")