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IOHUB object is added to manage PCI IRQs. It uses KVM_IRQFD ioctl to create irqfd to injecting PCI interrupts to the guest. IOHUB object forwards the irqfd to the remote process. Remote process uses this fd to directly send interrupts to the guest, bypassing QEMU. Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 51d5c3d54e28a68b002e3875c59599c9f5a424a1.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* Machine for remote device
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*
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* This machine type is used by the remote device process in multi-process
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* QEMU. QEMU device models depend on parent busses, interrupt controllers,
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* memory regions, etc. The remote machine type offers this environment so
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* that QEMU device models can be used as remote devices.
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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 "qemu-common.h"
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#include "hw/remote/machine.h"
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#include "exec/address-spaces.h"
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#include "exec/memory.h"
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#include "qapi/error.h"
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#include "hw/pci/pci_host.h"
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#include "hw/remote/iohub.h"
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static void remote_machine_init(MachineState *machine)
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{
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MemoryRegion *system_memory, *system_io, *pci_memory;
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RemoteMachineState *s = REMOTE_MACHINE(machine);
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RemotePCIHost *rem_host;
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PCIHostState *pci_host;
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system_memory = get_system_memory();
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system_io = get_system_io();
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pci_memory = g_new(MemoryRegion, 1);
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memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
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rem_host = REMOTE_PCIHOST(qdev_new(TYPE_REMOTE_PCIHOST));
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rem_host->mr_pci_mem = pci_memory;
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rem_host->mr_sys_mem = system_memory;
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rem_host->mr_sys_io = system_io;
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s->host = rem_host;
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object_property_add_child(OBJECT(s), "remote-pcihost", OBJECT(rem_host));
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memory_region_add_subregion_overlap(system_memory, 0x0, pci_memory, -1);
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qdev_realize(DEVICE(rem_host), sysbus_get_default(), &error_fatal);
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pci_host = PCI_HOST_BRIDGE(rem_host);
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remote_iohub_init(&s->iohub);
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pci_bus_irqs(pci_host->bus, remote_iohub_set_irq, remote_iohub_map_irq,
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&s->iohub, REMOTE_IOHUB_NB_PIRQS);
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}
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static void remote_machine_class_init(ObjectClass *oc, void *data)
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{
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MachineClass *mc = MACHINE_CLASS(oc);
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mc->init = remote_machine_init;
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mc->desc = "Experimental remote machine";
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}
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static const TypeInfo remote_machine = {
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.name = TYPE_REMOTE_MACHINE,
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.parent = TYPE_MACHINE,
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.instance_size = sizeof(RemoteMachineState),
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.class_init = remote_machine_class_init,
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};
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static void remote_machine_register_types(void)
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{
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type_register_static(&remote_machine);
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}
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type_init(remote_machine_register_types);
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