[PATCH v17 04/14] s390x/pci: Avoid creating zpci for VFs

[Akihiko Odaki <akihiko.odaki@daynix.com>]

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>
---
 hw/s390x/s390-pci-bus.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 40b2567aa706..f06df757a34b 100644
--- 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)) {

-- 
2.47.0