s390x/pci: Allow plugging SR-IOV devices

The guest cannot use VFs due to the lack of multifunction support but
can use PFs.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250116-reuse-v20-4-7cb370606368@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 8c5eb69f7d7699f1cd915a0760c4370c1997280b..c396d55c7240a31421ea573d7005d094d3dfdf34 100644 (file)
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -974,7 +974,14 @@ static void s390_pcihost_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         PCIDevice *pdev = PCI_DEVICE(dev);
 
-        if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
+        /*
+         * Multifunction is not supported due to the lack of CLP. However,
+         * do not check for multifunction capability for SR-IOV devices because
+         * SR-IOV devices automatically add the multifunction capability whether
+         * the user intends to use the functions other than the PF.
+         */
+        if (pdev->cap_present & QEMU_PCI_CAP_MULTIFUNCTION &&
+            !pdev->exp.sriov_cap) {
             error_setg(errp, "multifunction not supported in s390");
             return;
         }