1 /* 2 * Remote PCI host device 3 * 4 * Unlike PCI host devices that model physical hardware, the purpose 5 * of this PCI host is to host multi-process QEMU devices. 6 * 7 * Multi-process QEMU extends the PCI host of a QEMU machine into a 8 * remote process. Any PCI device attached to the remote process is 9 * visible in the QEMU guest. This allows existing QEMU device models 10 * to be reused in the remote process. 11 * 12 * This PCI host is purely a container for PCI devices. It's fake in the 13 * sense that the guest never sees this PCI host and has no way of 14 * accessing it. Its job is just to provide the environment that QEMU 15 * PCI device models need when running in a remote process. 16 * 17 * Copyright © 2018, 2021 Oracle and/or its affiliates. 18 * 19 * This work is licensed under the terms of the GNU GPL, version 2 or later. 20 * See the COPYING file in the top-level directory. 21 * 22 */ 23 24 #include "qemu/osdep.h" 25 26 #include "hw/pci/pci.h" 27 #include "hw/pci/pci_host.h" 28 #include "hw/pci/pcie_host.h" 29 #include "hw/qdev-properties.h" 30 #include "hw/pci-host/remote.h" 31 #include "exec/memory.h" 32 33 static const char *remote_pcihost_root_bus_path(PCIHostState *host_bridge, 34 PCIBus *rootbus) 35 { 36 return "0000:00"; 37 } 38 39 static void remote_pcihost_realize(DeviceState *dev, Error **errp) 40 { 41 PCIHostState *pci = PCI_HOST_BRIDGE(dev); 42 RemotePCIHost *s = REMOTE_PCIHOST(dev); 43 44 pci->bus = pci_root_bus_new(DEVICE(s), "remote-pci", 45 s->mr_pci_mem, s->mr_sys_io, 46 0, TYPE_PCIE_BUS); 47 } 48 49 static void remote_pcihost_class_init(ObjectClass *klass, void *data) 50 { 51 DeviceClass *dc = DEVICE_CLASS(klass); 52 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass); 53 54 hc->root_bus_path = remote_pcihost_root_bus_path; 55 dc->realize = remote_pcihost_realize; 56 57 dc->user_creatable = false; 58 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 59 dc->fw_name = "pci"; 60 } 61 62 static const TypeInfo remote_pcihost_info = { 63 .name = TYPE_REMOTE_PCIHOST, 64 .parent = TYPE_PCIE_HOST_BRIDGE, 65 .instance_size = sizeof(RemotePCIHost), 66 .class_init = remote_pcihost_class_init, 67 }; 68 69 static void remote_pcihost_register(void) 70 { 71 type_register_static(&remote_pcihost_info); 72 } 73 74 type_init(remote_pcihost_register) 75