@@ -3035,6 +3035,14 @@ S: Maintained
F: hw/semihosting/
F: include/hw/semihosting/
+Multi-process QEMU
+M: Jagannathan Raman <jag.raman@oracle.com>
+M: Elena Ufimtseva <elena.ufimtseva@oracle.com>
+M: John G Johnson <john.g.johnson@oracle.com>
+S: Maintained
+F: hw/pci-host/remote.c
+F: include/hw/pci-host/remote.h
+
Build and test automation
-------------------------
Build and test automation
@@ -18,6 +18,7 @@ common-obj-$(CONFIG_XEN_IGD_PASSTHROUGH) += xen_igd_pt.o
common-obj-$(CONFIG_PCI_EXPRESS_Q35) += q35.o
common-obj-$(CONFIG_PCI_EXPRESS_GENERIC_BRIDGE) += gpex.o
common-obj-$(CONFIG_PCI_EXPRESS_XILINX) += xilinx-pcie.o
+common-obj-$(CONFIG_MPQEMU) += remote.o
common-obj-$(CONFIG_PCI_EXPRESS_DESIGNWARE) += designware.o
obj-$(CONFIG_POWERNV) += pnv_phb4.o pnv_phb4_pec.o
new file mode 100644
@@ -0,0 +1,76 @@
+/*
+ * 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. It's job is just to provide the environment that QEMU
+ * PCI device models need when running in a remote process.
+ *
+ * Copyright © 2018, 2020 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)
+{
+ char *busname = g_strdup_printf("remote-pci-%ld", (unsigned long)getpid());
+ PCIHostState *pci = PCI_HOST_BRIDGE(dev);
+ RemotePCIHost *s = REMOTE_HOST_DEVICE(dev);
+
+ pci->bus = pci_root_bus_new(DEVICE(s), busname,
+ 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_HOST_DEVICE,
+ .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)
new file mode 100644
@@ -0,0 +1,30 @@
+/*
+ * PCI Host for remote device
+ *
+ * Copyright © 2018, 2020 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.
+ *
+ */
+
+#ifndef REMOTE_PCIHOST_H
+#define REMOTE_PCIHOST_H
+
+#include "exec/memory.h"
+#include "hw/pci/pcie_host.h"
+
+#define TYPE_REMOTE_HOST_DEVICE "remote-pcihost"
+#define REMOTE_HOST_DEVICE(obj) \
+ OBJECT_CHECK(RemotePCIHost, (obj), TYPE_REMOTE_HOST_DEVICE)
+
+typedef struct RemotePCIHost {
+ /*< private >*/
+ PCIExpressHost parent_obj;
+ /*< public >*/
+
+ MemoryRegion *mr_pci_mem;
+ MemoryRegion *mr_sys_io;
+} RemotePCIHost;
+
+#endif