mirror of https://github.com/proxmox/mirror_qemu
pcie: Mangle types to match topology
Windows will fail to start drivers for devices with an Endpoint type PCIe capability attached to a Root Complex (code 10 - Device cannot start). The proper type for such a device is Root Complex Integrated Endpoint. Devices don't care which they are, so do this conversion automatically. This allows the Windows driver to load for nec-usb-xhci when attached to pcie.0 of a q35 machine. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>master
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0889464a50
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eb28cb1bb0
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@ -48,6 +48,19 @@ int pcie_cap_init(PCIDevice *dev, uint8_t offset, uint8_t type, uint8_t port)
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assert(pci_is_express(dev));
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/*
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* Mangle type to convert Endpoints to Root Complex Integrated Endpoints.
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* Windows will report Code 10 (device cannot start) for regular Endpoints
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* on the Root Complex.
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*/
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if (pci_bus_is_express(dev->bus) && pci_bus_is_root(dev->bus)) {
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switch (type) {
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case PCI_EXP_TYPE_ENDPOINT:
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type = PCI_EXP_TYPE_RC_END;
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break;
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}
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}
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pos = pci_add_capability(dev, PCI_CAP_ID_EXP, offset,
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PCI_EXP_VER2_SIZEOF);
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if (pos < 0) {
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