test: add FreeBSD/PVH boottest

Adds a test that attempts to boot a FreeBSD microvm inside of
firecracker. FreeBSD boots using PVH, so this is implicitly also a test
of the PVH support.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

tests/integration_tests/functional/test_pvh.py

@@ -0,0 +1,28 @@
+import pytest
+
+from framework import defs
+from framework.properties import global_props
+
+pytestmark = pytest.mark.skipif(
+    global_props.cpu_architecture != "x86_64", reason="x86_64 specific tests"
+)
+
+
+@pytest.fixture
+def uvm_freebsd(microvm_factory):
+    """Create a FreeBSD microVM"""
+
+    # Cant use the rootfs_fxt and guest_kernel_fxt, because they only allow us to get supported kernels (and I am
+    # reluctant to add a freebsd regex to the list of supported kernels)
+    return microvm_factory.build(
+        defs.ARTIFACT_DIR / "freebsd/freebsd-kern.bin",
+        defs.ARTIFACT_DIR / "freebsd/freebsd-rootfs.bin",
+    )
+
+
+def test_freebsd_pvh_boot(uvm_freebsd):
+    """Tries to boot a FreeBSD microVM"""
+
+    uvm_freebsd.spawn()
+    uvm_freebsd.basic_config(boot_args="vfs.root.mountfrom=ufs:/dev/vtbd0")
+    uvm_freebsd.start()