During qemu init stage, when there is pci BDF conflicts, qemu print
a warning but not showing which device the BDF is occupied by. E.x:

"PCI: slot 2 function 0 not available for virtio-scsi-pci, in use by virtio-scsi-pci"

To facilitate user knowing the offending device and fixing it, showing
the id info in the warning.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/pci/pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 5d30f9ca60e5..0103a2c36ca2 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1078,9 +1078,9 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
         return NULL;
     } else if (!pci_bus_devfn_available(bus, devfn)) {
         error_setg(errp, "PCI: slot %d function %d not available for %s,"
-                   " in use by %s",
+                   " in use by %s,id=%s",
                    PCI_SLOT(devfn), PCI_FUNC(devfn), name,
-                   bus->devices[devfn]->name);
+                   bus->devices[devfn]->name, bus->devices[devfn]->qdev.id);
         return NULL;
     } else if (dev->hotplugged &&
                pci_get_function_0(pci_dev)) {
-- 
2.25.1