diff options
Diffstat (limited to 'hw/pci/pci.c')
| -rw-r--r-- | hw/pci/pci.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c index fb17138f7d..4b14f31859 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -65,6 +65,7 @@ bool pci_available = true; static char *pcibus_get_dev_path(DeviceState *dev); static char *pcibus_get_fw_dev_path(DeviceState *dev); static void pcibus_reset(BusState *qbus); +static bool pcie_has_upstream_port(PCIDevice *dev); static Property pci_props[] = { DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1), @@ -2121,6 +2122,25 @@ static void pci_qdev_realize(DeviceState *qdev, Error **errp) } } + /* + * A PCIe Downstream Port that do not have ARI Forwarding enabled must + * associate only Device 0 with the device attached to the bus + * representing the Link from the Port (PCIe base spec rev 4.0 ver 0.3, + * sec 7.3.1). + * With ARI, PCI_SLOT() can return non-zero value as the traditional + * 5-bit Device Number and 3-bit Function Number fields in its associated + * Routing IDs, Requester IDs and Completer IDs are interpreted as a + * single 8-bit Function Number. Hence, ignore ARI capable devices. + */ + if (pci_is_express(pci_dev) && + !pcie_find_capability(pci_dev, PCI_EXT_CAP_ID_ARI) && + pcie_has_upstream_port(pci_dev) && + PCI_SLOT(pci_dev->devfn)) { + warn_report("PCI: slot %d is not valid for %s," + " parent device only allows plugging into slot 0.", + PCI_SLOT(pci_dev->devfn), pci_dev->name); + } + if (pci_dev->failover_pair_id) { if (!pci_bus_is_express(pci_get_bus(pci_dev))) { error_setg(errp, "failover primary device must be on " |