fix(test): remove tests that are not relevant any more

With the new snapshot format we break compatibility with all previous
snapshot format versions. This commits removes all the tests that were
checking functional correctness and performance of loading older
snapshots in the current Firecracker binary.

In the future, it might be that two Firecracker binaries support the
same snapshot versions. When that happens we should thing of a proper
way to test that this works, but the current tests are not fit for
purpose.

Signed-off-by: Babis Chalios <bchalios@amazon.es>

tests/integration_tests/functional/test_mmds.py

@@ -10,7 +10,6 @@
 import pytest
 
 from framework.artifacts import working_version_as_artifact
-from framework.properties import global_props
 from framework.utils import (
     configure_mmds,
     generate_mmds_get_request,
@@ -612,39 +611,6 @@ def test_mmds_snapshot(uvm_nano, microvm_factory, version):
     )
 
 
-def test_mmds_older_snapshot(
-    microvm_factory, guest_kernel, rootfs, firecracker_release
-):
-    """
-    Test MMDS behavior restoring older snapshots in the current version.
-
-    Ensures that the MMDS version is persisted or initialised with the default
-    if the FC version does not support this feature.
-    """
-
-    # due to bug fixed in commit 8dab78b
-    firecracker_version = firecracker_release.version_tuple
-    if global_props.instance == "m6a.metal" and firecracker_version < (1, 3, 3):
-        pytest.skip("incompatible with AMD and Firecracker <1.3.3")
-
-    microvm = microvm_factory.build(
-        guest_kernel,
-        rootfs,
-        fc_binary_path=firecracker_release.path,
-        jailer_binary_path=firecracker_release.jailer,
-    )
-    microvm.spawn()
-    microvm.basic_config()
-    microvm.add_net_iface()
-
-    mmds_version = "V2"
-    _validate_mmds_snapshot(
-        microvm,
-        microvm_factory,
-        mmds_version,
-    )
-
-
 def test_mmds_v2_negative(test_microvm_with_api):
     """
     Test invalid MMDS GET/PUT requests when using V2.

tests/integration_tests/performance/test_snapshot_perf.py

@@ -2,10 +2,6 @@
 # SPDX-License-Identifier: Apache-2.0
 """Basic tests scenarios for snapshot save/restore."""
 
-import pytest
-
-from framework.properties import global_props
-
 # How many latencies do we sample per test.
 SAMPLE_COUNT = 3
 USEC_IN_MSEC = 1000
@@ -23,84 +19,6 @@ def snapshot_create_producer(vm):
     return value
 
 
-def snapshot_resume_producer(microvm_factory, snapshot):
-    """Produce results for snapshot resume tests."""
-
-    microvm = microvm_factory.build()
-    microvm.spawn()
-    microvm.restore_from_snapshot(snapshot, resume=True)
-
-    # Attempt to connect to resumed microvm.
-    # Verify if guest can run commands.
-    exit_code, _, _ = microvm.ssh.run("ls")
-    assert exit_code == 0
-
-    value = 0
-    # Parse all metric data points in search of load_snapshot time.
-    metrics = microvm.get_all_metrics()
-    for data_point in metrics:
-        cur_value = data_point["latencies_us"]["load_snapshot"] / USEC_IN_MSEC
-        if cur_value > 0:
-            value = cur_value
-            break
-
-    print("Latency {value} ms")
-    return value
-
-
-def test_older_snapshot_resume_latency(
-    microvm_factory,
-    guest_kernel_linux_4_14,
-    rootfs,
-    firecracker_release,
-    io_engine,
-    metrics,
-):
-    """
-    Test scenario: Older snapshot load performance measurement.
-
-    With each previous firecracker version, create a snapshot and try to
-    restore in current version.
-    """
-
-    # due to bug fixed in commit 8dab78b
-    firecracker_version = firecracker_release.version_tuple
-    if global_props.instance == "m6a.metal" and firecracker_version < (1, 3, 3):
-        pytest.skip("incompatible with AMD and Firecracker <1.3.3")
-
-    vm = microvm_factory.build(
-        guest_kernel_linux_4_14,
-        rootfs,
-        monitor_memory=False,
-        fc_binary_path=firecracker_release.path,
-        jailer_binary_path=firecracker_release.jailer,
-    )
-    vm.spawn()
-    vm.basic_config(vcpu_count=2, mem_size_mib=512)
-    vm.add_net_iface()
-    vm.start()
-    # Check if guest works.
-    exit_code, _, _ = vm.ssh.run("ls")
-    assert exit_code == 0
-    snapshot = vm.snapshot_full()
-
-    metrics.set_dimensions(
-        {
-            **vm.dimensions,
-            "io_engine": io_engine,
-            "performance_test": "test_older_snapshot_resume_latency",
-            "firecracker_version": firecracker_release.name,
-        }
-    )
-
-    for _ in range(SAMPLE_COUNT):
-        metrics.put_metric(
-            "latency",
-            snapshot_resume_producer(microvm_factory, snapshot),
-            "Milliseconds",
-        )
-
-
 def test_snapshot_create_latency(
     microvm_factory,
     guest_kernel_linux_4_14,