test: Add Linux on PVH test

Add a test that verifies that firecracker can boot a PVH-enabled linux,
and assert that it actually used the PVH boot protocol.

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

tests/integration_tests/functional/test_pvh.py

@@ -7,6 +7,7 @@
 
 import pytest
 
+from conftest import guest_kernel_fxt
 from framework import defs
 from framework.artifacts import NetIfaceConfig
 from framework.microvm import Serial
@@ -29,6 +30,36 @@ def uvm_freebsd(microvm_factory, artifact_dir):
     )
 
 
+pvh_kernel_params = [
+    pytest.param(path, id=path.name)
+    for path in defs.ARTIFACT_DIR.rglob("vmlinux-*-pvh")
+]
+pvh_guest_kernel = pytest.fixture(guest_kernel_fxt, params=pvh_kernel_params)
+
+
+@pytest.fixture
+def uvm_pvh(microvm_factory, pvh_guest_kernel, rootfs):
+    """Create a Linux/PVH microvm"""
+    return microvm_factory.build(pvh_guest_kernel, rootfs)
+
+
+def test_linux_pvh_boot(uvm_pvh):
+    """
+    Tests booting a PVH-enabled linux kernel for supported guest kernel version 5.10 and newer (as non-XEN PVH
+    support was added to linux in 5.0).
+
+    Asserts that the 'Kernel loaded using PVH boot protocol' log message is present
+    """
+    uvm_pvh.spawn()
+    uvm_pvh.basic_config()
+    uvm_pvh.add_net_iface()
+    uvm_pvh.start()
+
+    uvm_pvh.ssh.run("true")
+
+    uvm_pvh.check_log_message("Kernel loaded using PVH boot protocol")
+
+
 def test_freebsd_pvh_boot(uvm_freebsd):
     """Tries to boot a FreeBSD microVM"""
     freebsd_iface = NetIfaceConfig(
@@ -47,4 +78,4 @@ def test_freebsd_pvh_boot(uvm_freebsd):
     # SSH-ing into it. Therefore, we use the serial console and look for the login-prompt.
     serial = Serial(uvm_freebsd)
     serial.open()
-    serial.rx("login: ")
+    serial.rx("login: ")