75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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/*
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* Remote PCI host device
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*
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* Unlike PCI host devices that model physical hardware, the purpose
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* of this PCI host is to host multi-process QEMU devices.
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*
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* Multi-process QEMU extends the PCI host of a QEMU machine into a
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* remote process. Any PCI device attached to the remote process is
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* visible in the QEMU guest. This allows existing QEMU device models
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* to be reused in the remote process.
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*
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* This PCI host is purely a container for PCI devices. It's fake in the
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* sense that the guest never sees this PCI host and has no way of
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* accessing it. Its job is just to provide the environment that QEMU
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* PCI device models need when running in a remote process.
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*
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* Copyright © 2018, 2021 Oracle and/or its affiliates.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "hw/pci/pci.h"
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#include "hw/pci/pci_host.h"
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#include "hw/pci/pcie_host.h"
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#include "hw/qdev-properties.h"
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#include "hw/pci-host/remote.h"
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#include "exec/memory.h"
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static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge,
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PCIBus *rootbus)
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{
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return "0000:00";
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}
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static void remote_pcihost_realize(DeviceState *dev, Error **errp)
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{
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PCIHostState *pci = PCI_HOST_BRIDGE(dev);
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RemotePCIHost *s = REMOTE_PCIHOST(dev);
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pci->bus = pci_root_bus_new(DEVICE(s), "remote-pci",
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s->mr_pci_mem, s->mr_sys_io,
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0, TYPE_PCIE_BUS);
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}
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static void remote_pcihost_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
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hc->root_bus_path = remote_pcihost_root_bus_path;
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dc->realize = remote_pcihost_realize;
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dc->user_creatable = false;
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set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
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dc->fw_name = "pci";
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}
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static const TypeInfo remote_pcihost_info = {
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.name = TYPE_REMOTE_PCIHOST,
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.parent = TYPE_PCIE_HOST_BRIDGE,
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.instance_size = sizeof(RemotePCIHost),
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.class_init = remote_pcihost_class_init,
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};
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static void remote_pcihost_register(void)
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{
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type_register_static(&remote_pcihost_info);
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}
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type_init(remote_pcihost_register)
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