[Qemu-devel] [PATCH] hw/pci: ensure that only PCI/PCIe bridges can be attached to pxb/pxb-pcie devices

[Marcel Apfelbaum <marcel@redhat.com>]

PCI devices can't be plugged directly into PCI extra root bridges
because their resources can't be computed by firmware before the ACPI
tables are loaded.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---

Hi,

This patch follows the discussion:
https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg01484.html

Thanks,
Marcel
    
 hw/pci/pci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 168b9cc..584f504 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -850,6 +850,13 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
     DeviceState *dev = DEVICE(pci_dev);
 
     pci_dev->bus = bus;
+    /* Only pci bridges can be attached to extra PCI root buses */
+    if (pci_bus_is_root(bus) && bus->parent_dev && !pc->is_bridge) {
+        error_setg(errp,
+                   "PCI: Only PCI/PCIe bridges can be plugged into %s",
+                    bus->parent_dev->name);
+        return NULL;
+    }
 
     if (devfn < 0) {
         for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
-- 
2.4.3