225 lines
7.5 KiB
C
225 lines
7.5 KiB
C
/*
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* virtio-mem CCW implementation
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*
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* Copyright (C) 2024 Red Hat, Inc.
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*
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* Authors:
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* David Hildenbrand <david@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/qdev-properties.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "virtio-ccw-mem.h"
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#include "hw/mem/memory-device.h"
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#include "qapi/qapi-events-machine.h"
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#include "qapi/qapi-events-misc.h"
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static void virtio_ccw_mem_realize(VirtioCcwDevice *ccw_dev, Error **errp)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(ccw_dev);
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DeviceState *vdev = DEVICE(&dev->vdev);
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qdev_realize(vdev, BUS(&ccw_dev->bus), errp);
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}
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static void virtio_ccw_mem_set_addr(MemoryDeviceState *md, uint64_t addr,
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Error **errp)
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{
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object_property_set_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP, addr, errp);
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}
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static uint64_t virtio_ccw_mem_get_addr(const MemoryDeviceState *md)
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{
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return object_property_get_uint(OBJECT(md), VIRTIO_MEM_ADDR_PROP,
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&error_abort);
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}
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static MemoryRegion *virtio_ccw_mem_get_memory_region(MemoryDeviceState *md,
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Error **errp)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
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VirtIOMEM *vmem = &dev->vdev;
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VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
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return vmc->get_memory_region(vmem, errp);
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}
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static void virtio_ccw_mem_decide_memslots(MemoryDeviceState *md,
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unsigned int limit)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
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VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev);
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VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
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vmc->decide_memslots(vmem, limit);
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}
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static unsigned int virtio_ccw_mem_get_memslots(MemoryDeviceState *md)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
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VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev);
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VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem);
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return vmc->get_memslots(vmem);
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}
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static uint64_t virtio_ccw_mem_get_plugged_size(const MemoryDeviceState *md,
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Error **errp)
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{
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return object_property_get_uint(OBJECT(md), VIRTIO_MEM_SIZE_PROP,
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errp);
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}
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static void virtio_ccw_mem_fill_device_info(const MemoryDeviceState *md,
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MemoryDeviceInfo *info)
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{
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VirtioMEMDeviceInfo *vi = g_new0(VirtioMEMDeviceInfo, 1);
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md);
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VirtIOMEM *vmem = &dev->vdev;
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VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
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DeviceState *vdev = DEVICE(md);
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if (vdev->id) {
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vi->id = g_strdup(vdev->id);
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}
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/* let the real device handle everything else */
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vpc->fill_device_info(vmem, vi);
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info->u.virtio_mem.data = vi;
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info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
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}
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static uint64_t virtio_ccw_mem_get_min_alignment(const MemoryDeviceState *md)
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{
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return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
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&error_abort);
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}
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static void virtio_ccw_mem_size_change_notify(Notifier *notifier, void *data)
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{
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VirtIOMEMCcw *dev = container_of(notifier, VirtIOMEMCcw,
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size_change_notifier);
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DeviceState *vdev = DEVICE(dev);
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char *qom_path = object_get_canonical_path(OBJECT(dev));
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const uint64_t * const size_p = data;
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qapi_event_send_memory_device_size_change(vdev->id, *size_p, qom_path);
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g_free(qom_path);
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}
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static void virtio_ccw_mem_unplug_request_check(VirtIOMDCcw *vmd, Error **errp)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(vmd);
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VirtIOMEM *vmem = &dev->vdev;
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VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem);
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vpc->unplug_request_check(vmem, errp);
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}
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static void virtio_ccw_mem_get_requested_size(Object *obj, Visitor *v,
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const char *name, void *opaque,
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Error **errp)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
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object_property_get(OBJECT(&dev->vdev), name, v, errp);
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}
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static void virtio_ccw_mem_set_requested_size(Object *obj, Visitor *v,
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const char *name, void *opaque,
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Error **errp)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
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DeviceState *vdev = DEVICE(obj);
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/*
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* If we passed virtio_ccw_mem_unplug_request_check(), making sure that
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* the requested size is 0, don't allow modifying the requested size
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* anymore, otherwise the VM might end up hotplugging memory before
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* handling the unplug request.
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*/
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if (vdev->pending_deleted_event) {
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error_setg(errp, "'%s' cannot be changed if the device is in the"
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" process of unplug", name);
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return;
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}
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object_property_set(OBJECT(&dev->vdev), name, v, errp);
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}
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static const Property virtio_ccw_mem_properties[] = {
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DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
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VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
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DEFINE_PROP_UINT32("max_revision", VirtioCcwDevice, max_rev,
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VIRTIO_CCW_MAX_REV),
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};
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static void virtio_ccw_mem_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
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MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass);
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VirtIOMDCcwClass *vmdc = VIRTIO_MD_CCW_CLASS(klass);
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k->realize = virtio_ccw_mem_realize;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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device_class_set_props(dc, virtio_ccw_mem_properties);
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mdc->get_addr = virtio_ccw_mem_get_addr;
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mdc->set_addr = virtio_ccw_mem_set_addr;
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mdc->get_plugged_size = virtio_ccw_mem_get_plugged_size;
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mdc->get_memory_region = virtio_ccw_mem_get_memory_region;
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mdc->decide_memslots = virtio_ccw_mem_decide_memslots;
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mdc->get_memslots = virtio_ccw_mem_get_memslots;
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mdc->fill_device_info = virtio_ccw_mem_fill_device_info;
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mdc->get_min_alignment = virtio_ccw_mem_get_min_alignment;
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vmdc->unplug_request_check = virtio_ccw_mem_unplug_request_check;
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}
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static void virtio_ccw_mem_instance_init(Object *obj)
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{
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VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj);
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VirtIOMEMClass *vmc;
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VirtIOMEM *vmem;
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virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
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TYPE_VIRTIO_MEM);
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dev->size_change_notifier.notify = virtio_ccw_mem_size_change_notify;
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vmem = &dev->vdev;
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vmc = VIRTIO_MEM_GET_CLASS(vmem);
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/*
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* We never remove the notifier again, as we expect both devices to
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* disappear at the same time.
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*/
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vmc->add_size_change_notifier(vmem, &dev->size_change_notifier);
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object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP,
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OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP);
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object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev),
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VIRTIO_MEM_SIZE_PROP);
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object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size",
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virtio_ccw_mem_get_requested_size,
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virtio_ccw_mem_set_requested_size, NULL, NULL);
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}
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static const TypeInfo virtio_ccw_mem = {
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.name = TYPE_VIRTIO_MEM_CCW,
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.parent = TYPE_VIRTIO_MD_CCW,
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.instance_size = sizeof(VirtIOMEMCcw),
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.instance_init = virtio_ccw_mem_instance_init,
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.class_init = virtio_ccw_mem_class_init,
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};
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static void virtio_ccw_mem_register_types(void)
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{
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type_register_static(&virtio_ccw_mem);
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}
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type_init(virtio_ccw_mem_register_types)
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