[PATCH RFC 4/5] s390x: implement virtio-mem-ccw

[David Hildenbrand <david@redhat.com>]

Add a proper CCW proxy device, similar to the PCI variant.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/virtio-ccw-mem.c | 165 ++++++++++++++++++++++++++++++++++++++
 hw/s390x/virtio-ccw.h     |  13 +++
 2 files changed, 178 insertions(+)
 create mode 100644 hw/s390x/virtio-ccw-mem.c

diff --git a/hw/s390x/virtio-ccw-mem.c b/hw/s390x/virtio-ccw-mem.c
new file mode 100644
index 0000000000..ae856d7ad4
--- /dev/null
+++ b/hw/s390x/virtio-ccw-mem.c
@@ -0,0 +1,165 @@
+/*
+ * Virtio MEM CCW device
+ *
+ * Copyright (C) 2020 Red Hat, Inc.
+ *
+ * Authors:
+ *  David Hildenbrand <david@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/qdev-properties.h"
+#include "hw/virtio/virtio.h"
+#include "qapi/error.h"
+#include "qemu/module.h"
+#include "virtio-ccw.h"
+#include "hw/mem/memory-device.h"
+#include "qapi/qapi-events-misc.h"
+
+static void virtio_ccw_mem_realize(VirtioCcwDevice *ccw_dev, Error **errp)
+{
+    VirtIOMEMCcw *ccw_mem = VIRTIO_MEM_CCW(ccw_dev);
+    DeviceState *vdev = DEVICE(&ccw_mem->vdev);
+
+    qdev_realize(vdev, BUS(&ccw_dev->bus), errp);
+}
+
+static void virtio_ccw_mem_set_addr(MemoryDeviceState *md, uint64_t addr,
+                                    Error **errp)
+{
+    object_property_set_uint(OBJECT(md), addr, VIRTIO_MEM_ADDR_PROP, errp);
+}
+
+static uint64_t virtio_ccw_mem_get_addr(const MemoryDeviceState *md)
+{
+    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
+                                    &error_abort);
+}
+
+static MemoryRegion *virtio_ccw_mem_get_memory_region(MemoryDeviceState *md,
+                                                      Error **errp)
+{
+    VirtIOMEMCcw *ccw_mem = VIRTIO_MEM_CCW(md);
+    VirtIOMEM *vmem = VIRTIO_MEM(&ccw_mem->vdev);
+    VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
+
+    return vmc->get_memory_region(vmem, errp);
+}
+
+static uint64_t virtio_ccw_mem_get_plugged_size(const MemoryDeviceState *md,
+                                                Error **errp)
+{
+    return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
+                                    errp);
+}
+
+static void virtio_ccw_mem_fill_device_info(const MemoryDeviceState *md,
+                                            MemoryDeviceInfo *info)
+{
+    VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
+    VirtIOMEMCcw *ccw_mem = VIRTIO_MEM_CCW(md);
+    VirtIOMEM *vmem = VIRTIO_MEM(&ccw_mem->vdev);
+    VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
+    DeviceState *dev = DEVICE(md);
+
+    if (dev->id) {
+        vi->has_id = true;
+        vi->id = g_strdup(dev->id);
+    }
+
+    /* let the real device handle everything else */
+    vpc->fill_device_info(vmem, vi);
+
+    info->u.virtio_mem.data = vi;
+    info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
+}
+
+static void virtio_ccw_mem_size_change_notify(Notifier *notifier, void *data)
+{
+    VirtIOMEMCcw *ccw_mem = container_of(notifier, VirtIOMEMCcw,
+                                         size_change_notifier);
+    DeviceState *dev = DEVICE(ccw_mem);
+    const uint64_t * const size_p = data;
+    const char *id = NULL;
+
+    if (dev->id) {
+        id = g_strdup(dev->id);
+    }
+
+    qapi_event_send_memory_device_size_change(!!id, id, *size_p);
+}
+
+static void virtio_ccw_mem_instance_init(Object *obj)
+{
+    VirtIOMEMCcw *ccw_mem = VIRTIO_MEM_CCW(obj);
+    VirtIOMEMClass *vmc;
+    VirtIOMEM *vmem;
+
+    virtio_instance_init_common(obj, &ccw_mem->vdev, sizeof(ccw_mem->vdev),
+                                TYPE_VIRTIO_MEM);
+
+    ccw_mem->size_change_notifier.notify = virtio_ccw_mem_size_change_notify;
+    vmem = VIRTIO_MEM(&ccw_mem->vdev);
+    vmc = VIRTIO_MEM_GET_CLASS(vmem);
+    /*
+     * We never remove the notifier again, as we expect both devices to
+     * disappear at the same time.
+     */
+    vmc->add_size_change_notifier(vmem, &ccw_mem->size_change_notifier);
+
+    object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
+                              OBJECT(&ccw_mem->vdev),
+                              VIRTIO_MEM_BLOCK_SIZE_PROP);
+    object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&ccw_mem->vdev),
+                              VIRTIO_MEM_SIZE_PROP);
+    object_property_add_alias(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP,
+                              OBJECT(&ccw_mem->vdev),
+                              VIRTIO_MEM_REQUESTED_SIZE_PROP);
+}
+
+static Property virtio_ccw_mem_properties[] = {
+    DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
+                    VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
+    DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
+                       VIRTIO_CCW_MAX_REV),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_ccw_mem_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
+    MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
+
+    k->realize = virtio_ccw_mem_realize;
+    device_class_set_props(dc, virtio_ccw_mem_properties);
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+
+    mdc->get_addr = virtio_ccw_mem_get_addr;
+    mdc->set_addr = virtio_ccw_mem_set_addr;
+    mdc->get_plugged_size = virtio_ccw_mem_get_plugged_size;
+    mdc->get_memory_region = virtio_ccw_mem_get_memory_region;
+    mdc->fill_device_info = virtio_ccw_mem_fill_device_info;
+}
+
+static const TypeInfo virtio_ccw_mem = {
+    .name = TYPE_VIRTIO_MEM_CCW,
+    .parent = TYPE_VIRTIO_CCW_DEVICE,
+    .instance_size = sizeof(VirtIOMEMCcw),
+    .instance_init = virtio_ccw_mem_instance_init,
+    .class_init = virtio_ccw_mem_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_MEMORY_DEVICE },
+        { }
+    },
+};
+
+static void virtio_ccw_mem_register(void)
+{
+    type_register_static(&virtio_ccw_mem);
+}
+
+type_init(virtio_ccw_mem_register)
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index c0e3355248..77aa87c41f 100644
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -29,6 +29,7 @@
 #endif /* CONFIG_VHOST_VSOCK */
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-input.h"
+#include "hw/virtio/virtio-mem.h"
 
 #include "hw/s390x/s390_flic.h"
 #include "hw/s390x/css.h"
@@ -256,4 +257,16 @@ typedef struct VirtIOInputHIDCcw {
     VirtIOInputHID vdev;
 } VirtIOInputHIDCcw;
 
+/* virtio-mem-ccw */
+
+#define TYPE_VIRTIO_MEM_CCW "virtio-mem-ccw"
+#define VIRTIO_MEM_CCW(obj) \
+        OBJECT_CHECK(VirtIOMEMCcw, (obj), TYPE_VIRTIO_MEM_CCW)
+
+typedef struct VirtIOMEMCcw {
+    VirtioCcwDevice parent_obj;
+    VirtIOMEM vdev;
+    Notifier size_change_notifier;
+} VirtIOMEMCcw;
+
 #endif
-- 
2.26.2