ci(snapshot): create aarch64 snapshots in cross-restore pipeline

The perms_aarch64 loop expects aarch64 phase1 snapshots to exist for
restore steps to consume, but the snapshot-create group was x86-only,
so every aarch64 restore step failed at artifact download. Add an
aarch64 snapshot-create group and enable test_snapshot_phase1 on arm.

Signed-off-by: Jack Thomson <jackabt@amazon.com>

Author: JackThomson2

.buildkite/pipeline_cross.py

@@ -45,6 +45,17 @@
         instances=instances_x86_64,
         platforms=DEFAULT_PLATFORMS,
     )
+
+    # https://github.com/firecracker-microvm/firecracker/blob/main/docs/snapshotting/snapshot-support.md#where-can-i-resume-my-snapshots
+    aarch64_platforms = [("al2023", "linux_6.1")]
+    pipeline.build_group(
+        "snapshot-create-aarch64",
+        commands,
+        timeout=30,
+        artifact_paths="snapshots/**/*",
+        instances=instances_aarch64,
+        platforms=aarch64_platforms,
+    )
     pipeline.add_step("wait")
 
     # allow-list of what instances can be restores on what other instances (in
@@ -53,9 +64,6 @@
         "m5n.metal": ["m6i.metal"],
         "m6i.metal": ["m5n.metal"],
     }
-
-    # https://github.com/firecracker-microvm/firecracker/blob/main/docs/kernel-policy.md#experimental-snapshot-compatibility-across-kernel-versions
-    aarch64_platforms = [("al2023", "linux_6.1")]
     aarch64_all_platforms = aarch64_platforms + restore_only_platforms
     perms_aarch64 = itertools.product(
         instances_aarch64, aarch64_platforms, instances_aarch64, aarch64_all_platforms

tests/integration_tests/functional/test_snapshot_phase1.py

@@ -6,7 +6,6 @@
 """
 
 import json
-import platform
 import re
 
 import pytest
@@ -18,9 +17,6 @@
 )
 from framework.utils_cpu_templates import get_cpu_template_name
 
-if platform.machine() != "x86_64":
-    pytestmark = pytest.mark.skip("only x86_64 architecture supported")
-
 # Default IPv4 address to route MMDS requests.
 IPV4_ADDRESS = "169.254.169.254"
 NET_IFACE_FOR_MMDS = "eth3"