Use PCI of a PGPU for PCI passthrough tests

Instead a picking a random PCI that could break the host
when passthroughed: use the PCI of a PGPU that will also be used
in PGPU passthrough tests anyway.

Signed-off-by: Benjamin Reis <[email protected]>

jobs.py

@@ -401,7 +401,7 @@
     "pci-passthrough": {
         "description": "Testing PCI passthrough functionalities",
         "requirements": [
-            "A XCP-ng host >= 8.3 with a PGPU and a PCI to passthrough.",
+            "A XCP-ng host >= 8.3 with a PGPU to passthrough.",
             "The host will be rebooted by the tests."
         ],
         "nb_pools": 1,

tests/pci_passthrough/conftest.py

@@ -3,28 +3,6 @@
 
 from lib.common import safe_split
 
-@pytest.fixture(scope="session")
-def enabled_pci_uuid(host):
-    pci_uuids = safe_split(host.xe("pci-list", {"host-uuid": host.uuid, "dependencies": ""}, minimal=True), ',')
-
-    pci_uuid = None
-    for uuid in pci_uuids:
-        dom0_access = host.xe("pci-get-dom0-access-status", {"uuid": uuid})
-        if dom0_access == "enabled":
-            pci_uuid = uuid
-            break
-
-    if pci_uuid is None:
-        pytest.skip("This test requires a PCI to hide from dom0")
-
-    yield pci_uuid
-
-    # Put PCI back in initial state
-    if host.xe("pci-get-dom0-access-status", {"uuid": pci_uuid}) != "enabled":
-        host.xe("pci-enable-dom0-access", {"uuid": pci_uuid})
-        if host.xe("pci-get-dom0-access-status", {"uuid": pci_uuid}) != "enabled":
-            host.reboot(verify=True)
-
 @pytest.fixture(scope="session")
 def enabled_pgpu_uuid(host):
     pgpu_uuids = safe_split(host.xe("pgpu-list", {"host-uuid": host.uuid}, minimal=True), ',')
@@ -48,3 +26,8 @@ def enabled_pgpu_uuid(host):
         host.xe("pci-enable-dom0-access", {"uuid": pci_uuid})
         if host.xe("pci-get-dom0-access-status", {"uuid": pci_uuid}) != "enabled":
             host.reboot(verify=True)
+
+@pytest.fixture(scope="session")
+def enabled_pci_uuid(host, enabled_pgpu_uuid):
+    pci_uuid = host.xe("pgpu-param-get", {"uuid": enabled_pgpu_uuid, "param-name": "pci-uuid"})
+    return pci_uuid