virtio-iommu-pci: Add virtio iommu pci support

This patch adds virtio-iommu-pci, which is the pci proxy for
the virtio-iommu device.

Currently non DT integration is not yet supported by the kernel.
So the machine must implement a hotplug handler for the
virtio-iommu-pci device that creates the device tree iommu-map
bindings as documented in kernel documentation:

Documentation/devicetree/bindings/virtio/iommu.txt

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

Message-Id: <20200214132745.23392-9-eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/Makefile.objs

@@ -29,6 +29,7 @@ obj-$(CONFIG_VIRTIO_INPUT_HOST) += virtio-input-host-pci.o
 obj-$(CONFIG_VIRTIO_INPUT) += virtio-input-pci.o
 obj-$(CONFIG_VIRTIO_RNG) += virtio-rng-pci.o
 obj-$(CONFIG_VIRTIO_BALLOON) += virtio-balloon-pci.o
+obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu-pci.o
 obj-$(CONFIG_VIRTIO_9P) += virtio-9p-pci.o
 obj-$(CONFIG_VIRTIO_SCSI) += virtio-scsi-pci.o
 obj-$(CONFIG_VIRTIO_BLK) += virtio-blk-pci.o

hw/virtio/virtio-iommu-pci.c

+/*
+ * Virtio IOMMU PCI Bindings
+ *
+ * Copyright (c) 2019 Red Hat, Inc.
+ * Written by Eric Auger
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 or
+ *  (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+
+#include "virtio-pci.h"
+#include "hw/virtio/virtio-iommu.h"
+#include "hw/qdev-properties.h"
+#include "qapi/error.h"
+#include "hw/boards.h"
+
+typedef struct VirtIOIOMMUPCI VirtIOIOMMUPCI;
+
+/*
+ * virtio-iommu-pci: This extends VirtioPCIProxy.
+ *
+ */
+#define VIRTIO_IOMMU_PCI(obj) \
+        OBJECT_CHECK(VirtIOIOMMUPCI, (obj), TYPE_VIRTIO_IOMMU_PCI)
+
+struct VirtIOIOMMUPCI {
+    VirtIOPCIProxy parent_obj;
+    VirtIOIOMMU vdev;
+};
+
+static Property virtio_iommu_pci_properties[] = {
+    DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_iommu_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
+{
+    VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(vpci_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
+
+    if (!qdev_get_machine_hotplug_handler(DEVICE(vpci_dev))) {
+        MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
+
+        error_setg(errp,
+                   "%s machine fails to create iommu-map device tree bindings",
+                   mc->name);
+        error_append_hint(errp,
+                          "Check you machine implements a hotplug handler "
+                          "for the virtio-iommu-pci device\n");
+        error_append_hint(errp, "Check the guest is booted without FW or with "
+                          "-no-acpi\n");
+        return;
+    }
+    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
+    object_property_set_link(OBJECT(dev),
+                             OBJECT(pci_get_bus(&vpci_dev->pci_dev)),
+                             "primary-bus", errp);
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
+}
+
+static void virtio_iommu_pci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
+    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
+    k->realize = virtio_iommu_pci_realize;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    device_class_set_props(dc, virtio_iommu_pci_properties);
+    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_IOMMU;
+    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
+    pcidev_k->class_id = PCI_CLASS_OTHERS;
+    dc->hotpluggable = false;
+}
+
+static void virtio_iommu_pci_instance_init(Object *obj)
+{
+    VirtIOIOMMUPCI *dev = VIRTIO_IOMMU_PCI(obj);
+
+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
+                                TYPE_VIRTIO_IOMMU);
+}
+
+static const VirtioPCIDeviceTypeInfo virtio_iommu_pci_info = {
+    .base_name             = TYPE_VIRTIO_IOMMU_PCI,
+    .generic_name          = "virtio-iommu-pci",
+    .transitional_name     = "virtio-iommu-pci-transitional",
+    .non_transitional_name = "virtio-iommu-pci-non-transitional",
+    .instance_size = sizeof(VirtIOIOMMUPCI),
+    .instance_init = virtio_iommu_pci_instance_init,
+    .class_init    = virtio_iommu_pci_class_init,
+};
+
+static void virtio_iommu_pci_register(void)
+{
+    virtio_pci_types_register(&virtio_iommu_pci_info);
+}
+
+type_init(virtio_iommu_pci_register)
+
+

include/hw/pci/pci.h

@@ -86,6 +86,7 @@ extern bool pci_available;
 #define PCI_DEVICE_ID_VIRTIO_9P          0x1009
 #define PCI_DEVICE_ID_VIRTIO_VSOCK       0x1012
 #define PCI_DEVICE_ID_VIRTIO_PMEM        0x1013
+#define PCI_DEVICE_ID_VIRTIO_IOMMU       0x1014
 
 #define PCI_VENDOR_ID_REDHAT             0x1b36
 #define PCI_DEVICE_ID_REDHAT_BRIDGE      0x0001

include/hw/virtio/virtio-iommu.h

@@ -25,6 +25,7 @@
 #include "hw/pci/pci.h"
 
 #define TYPE_VIRTIO_IOMMU "virtio-iommu-device"
+#define TYPE_VIRTIO_IOMMU_PCI "virtio-iommu-device-base"
 #define VIRTIO_IOMMU(obj) \
         OBJECT_CHECK(VirtIOIOMMU, (obj), TYPE_VIRTIO_IOMMU)
 

qdev-monitor.c

@@ -67,6 +67,7 @@ static const QDevAlias qdev_alias_table[] = {
     { "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_S390X },
     { "virtio-input-host-pci", "virtio-input-host",
             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
+    { "virtio-iommu-pci", "virtio-iommu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
     { "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_S390X },
     { "virtio-keyboard-pci", "virtio-keyboard",
             QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },