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