s390x/pci: Avoid creating zpci for VFs

VFs are automatically created by PF, and creating zpci for them will
result in unexpected usage of fids. Currently QEMU does not support
multifunction for s390x so we don't need zpci for VFs anyway.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250116-reuse-v20-3-7cb370606368@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index eead269cc285f10c57db6ae87f7113943146a3bf..8c5eb69f7d7699f1cd915a0760c4370c1997280b 100644 (file)
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -1080,6 +1080,16 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
 
         pbdev = s390_pci_find_dev_by_target(s, dev->id);
         if (!pbdev) {
+            /*
+             * VFs are automatically created by PF, and creating zpci for them
+             * will result in unexpected usage of fids. Currently QEMU does not
+             * support multifunction for s390x so we don't need zpci for VFs
+             * anyway.
+             */
+            if (pci_is_vf(pdev)) {
+                return;
+            }
+
             pbdev = s390_pci_device_new(s, dev->id, errp);
             if (!pbdev) {
                 return;
@@ -1167,7 +1177,10 @@ static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         int32_t devfn;
 
         pbdev = s390_pci_find_dev_by_pci(s, PCI_DEVICE(dev));
-        g_assert(pbdev);
+        if (!pbdev) {
+            g_assert(pci_is_vf(pci_dev));
+            return;
+        }
 
         s390_pci_generate_plug_event(HP_EVENT_STANDBY_TO_RESERVED,
                                      pbdev->fh, pbdev->fid);
@@ -1206,7 +1219,11 @@ static void s390_pcihost_unplug_request(HotplugHandler *hotplug_dev,
          * we've checked the PCI device already (to prevent endless recursion).
          */
         pbdev = s390_pci_find_dev_by_pci(s, PCI_DEVICE(dev));
-        g_assert(pbdev);
+        if (!pbdev) {
+            g_assert(pci_is_vf(PCI_DEVICE(dev)));
+            return;
+        }
+
         pbdev->pci_unplug_request_processed = true;
         qdev_unplug(DEVICE(pbdev), errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_S390_PCI_DEVICE)) {