@@ -3111,6 +3111,8 @@ F: include/hw/i386/remote-obj.h
F: hw/i386/remote-obj.c
F: include/hw/i386/remote-memory.h
F: hw/i386/remote-memory.c
+F: hw/pci/proxy.c
+F: include/hw/pci/proxy.h
Build and test automation
-------------------------
@@ -12,6 +12,7 @@ pci_ss.add(files(
# allow plugging PCIe devices into PCI buses, include them even if
# CONFIG_PCI_EXPRESS=n.
pci_ss.add(files('pcie.c', 'pcie_aer.c'))
+pci_ss.add(when: 'CONFIG_MPQEMU', if_true: files('proxy.c'))
softmmu_ss.add(when: 'CONFIG_PCI_EXPRESS', if_true: files('pcie_port.c', 'pcie_host.c'))
softmmu_ss.add_all(when: 'CONFIG_PCI', if_true: pci_ss)
new file mode 100644
@@ -0,0 +1,98 @@
+/*
+ * 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/proxy.h"
+#include "hw/pci/pci.h"
+#include "qapi/error.h"
+#include "io/channel-util.h"
+#include "hw/qdev-properties.h"
+#include "monitor/monitor.h"
+#include "migration/blocker.h"
+
+static void proxy_set_socket(PCIProxyDev *pdev, int fd, Error **errp)
+{
+ pdev->ioc = qio_channel_new_fd(fd, errp);
+}
+
+static Property proxy_properties[] = {
+ DEFINE_PROP_STRING("fd", PCIProxyDev, fd),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
+{
+ PCIProxyDev *dev = PCI_PROXY_DEV(device);
+ int fd;
+
+ if (dev->fd) {
+ fd = monitor_fd_param(monitor_cur(), dev->fd, errp);
+ if (fd == -1) {
+ error_prepend(errp, "proxy: unable to parse fd: ");
+ return;
+ }
+ proxy_set_socket(dev, fd, errp);
+ } else {
+ error_setg(errp, "fd parameter not specified for %s",
+ DEVICE(device)->id);
+ return;
+ }
+
+ error_setg(&dev->migration_blocker, "%s does not support migration",
+ TYPE_PCI_PROXY_DEV);
+ if (migrate_add_blocker(dev->migration_blocker, errp)) {
+ error_free(dev->migration_blocker);
+ error_free(*errp);
+ dev->migration_blocker = NULL;
+ error_setg(errp, "Failed to set migration blocker");
+ }
+
+ qemu_mutex_init(&dev->io_mutex);
+ qio_channel_set_blocking(dev->ioc, true, NULL);
+}
+
+static void pci_proxy_dev_exit(PCIDevice *pdev)
+{
+ PCIProxyDev *dev = PCI_PROXY_DEV(pdev);
+
+ qio_channel_close(dev->ioc, NULL);
+
+ migrate_del_blocker(dev->migration_blocker);
+
+ error_free(dev->migration_blocker);
+}
+
+static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+ k->realize = pci_proxy_dev_realize;
+ k->exit = pci_proxy_dev_exit;
+ device_class_set_props(dc, proxy_properties);
+}
+
+static const TypeInfo pci_proxy_dev_type_info = {
+ .name = TYPE_PCI_PROXY_DEV,
+ .parent = TYPE_PCI_DEVICE,
+ .instance_size = sizeof(PCIProxyDev),
+ .class_init = pci_proxy_dev_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { INTERFACE_CONVENTIONAL_PCI_DEVICE },
+ { },
+ },
+};
+
+static void pci_proxy_dev_register_types(void)
+{
+ type_register_static(&pci_proxy_dev_type_info);
+}
+
+type_init(pci_proxy_dev_register_types)
new file mode 100644
@@ -0,0 +1,36 @@
+/*
+ * 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 PROXY_H
+#define PROXY_H
+
+#include "hw/pci/pci.h"
+#include "io/channel.h"
+
+#define TYPE_PCI_PROXY_DEV "x-pci-proxy-dev"
+
+#define PCI_PROXY_DEV(obj) \
+ OBJECT_CHECK(PCIProxyDev, (obj), TYPE_PCI_PROXY_DEV)
+typedef struct PCIProxyDev PCIProxyDev;
+
+struct PCIProxyDev {
+ PCIDevice parent_dev;
+ char *fd;
+
+ /*
+ * Mutex used to protect the QIOChannel fd from
+ * the concurrent access by the VCPUs since proxy
+ * blocks while awaiting for the replies from the
+ * process remote.
+ */
+ QemuMutex io_mutex;
+ QIOChannel *ioc;
+ Error *migration_blocker;
+};
+
+#endif /* PROXY_H */