diff options
Diffstat (limited to 'hw/s390x/virtio-ccw-mem.c')
| -rw-r--r-- | hw/s390x/virtio-ccw-mem.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/hw/s390x/virtio-ccw-mem.c b/hw/s390x/virtio-ccw-mem.c new file mode 100644 index 0000000..daa485d --- /dev/null +++ b/hw/s390x/virtio-ccw-mem.c @@ -0,0 +1,225 @@ +/* + * virtio-mem CCW implementation + * + * Copyright (C) 2024 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 "qapi/error.h" +#include "qemu/module.h" +#include "virtio-ccw-mem.h" +#include "hw/mem/memory-device.h" +#include "qapi/qapi-events-machine.h" +#include "qapi/qapi-events-misc.h" + +static void virtio_ccw_mem_realize(VirtioCcwDevice *ccw_dev, Error **errp) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(ccw_dev); + DeviceState *vdev = DEVICE(&dev->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), VIRTIO_MEM_ADDR_PROP, addr, 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 *dev = VIRTIO_MEM_CCW(md); + VirtIOMEM *vmem = &dev->vdev; + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); + + return vmc->get_memory_region(vmem, errp); +} + +static void virtio_ccw_mem_decide_memslots(MemoryDeviceState *md, + unsigned int limit) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); + VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev); + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); + + vmc->decide_memslots(vmem, limit); +} + +static unsigned int virtio_ccw_mem_get_memslots(MemoryDeviceState *md) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(md); + VirtIOMEM *vmem = VIRTIO_MEM(&dev->vdev); + VirtIOMEMClass *vmc = VIRTIO_MEM_GET_CLASS(vmem); + + return vmc->get_memslots(vmem); +} + +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 *dev = VIRTIO_MEM_CCW(md); + VirtIOMEM *vmem = &dev->vdev; + VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); + DeviceState *vdev = DEVICE(md); + + if (vdev->id) { + vi->id = g_strdup(vdev->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 uint64_t virtio_ccw_mem_get_min_alignment(const MemoryDeviceState *md) +{ + return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP, + &error_abort); +} + +static void virtio_ccw_mem_size_change_notify(Notifier *notifier, void *data) +{ + VirtIOMEMCcw *dev = container_of(notifier, VirtIOMEMCcw, + size_change_notifier); + DeviceState *vdev = DEVICE(dev); + char *qom_path = object_get_canonical_path(OBJECT(dev)); + const uint64_t * const size_p = data; + + qapi_event_send_memory_device_size_change(vdev->id, *size_p, qom_path); + g_free(qom_path); +} + +static void virtio_ccw_mem_unplug_request_check(VirtIOMDCcw *vmd, Error **errp) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(vmd); + VirtIOMEM *vmem = &dev->vdev; + VirtIOMEMClass *vpc = VIRTIO_MEM_GET_CLASS(vmem); + + vpc->unplug_request_check(vmem, errp); +} + +static void virtio_ccw_mem_get_requested_size(Object *obj, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); + + object_property_get(OBJECT(&dev->vdev), name, v, errp); +} + +static void virtio_ccw_mem_set_requested_size(Object *obj, Visitor *v, + const char *name, void *opaque, + Error **errp) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); + DeviceState *vdev = DEVICE(obj); + + /* + * If we passed virtio_ccw_mem_unplug_request_check(), making sure that + * the requested size is 0, don't allow modifying the requested size + * anymore, otherwise the VM might end up hotplugging memory before + * handling the unplug request. + */ + if (vdev->pending_deleted_event) { + error_setg(errp, "'%s' cannot be changed if the device is in the" + " process of unplug", name); + return; + } + + object_property_set(OBJECT(&dev->vdev), name, v, errp); +} + +static const 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), +}; + +static void virtio_ccw_mem_class_init(ObjectClass *klass, const void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass); + MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(klass); + VirtIOMDCcwClass *vmdc = VIRTIO_MD_CCW_CLASS(klass); + + k->realize = virtio_ccw_mem_realize; + set_bit(DEVICE_CATEGORY_MISC, dc->categories); + device_class_set_props(dc, virtio_ccw_mem_properties); + + 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->decide_memslots = virtio_ccw_mem_decide_memslots; + mdc->get_memslots = virtio_ccw_mem_get_memslots; + mdc->fill_device_info = virtio_ccw_mem_fill_device_info; + mdc->get_min_alignment = virtio_ccw_mem_get_min_alignment; + + vmdc->unplug_request_check = virtio_ccw_mem_unplug_request_check; +} + +static void virtio_ccw_mem_instance_init(Object *obj) +{ + VirtIOMEMCcw *dev = VIRTIO_MEM_CCW(obj); + VirtIOMEMClass *vmc; + VirtIOMEM *vmem; + + virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev), + TYPE_VIRTIO_MEM); + + dev->size_change_notifier.notify = virtio_ccw_mem_size_change_notify; + vmem = &dev->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, &dev->size_change_notifier); + + object_property_add_alias(obj, VIRTIO_MEM_BLOCK_SIZE_PROP, + OBJECT(&dev->vdev), VIRTIO_MEM_BLOCK_SIZE_PROP); + object_property_add_alias(obj, VIRTIO_MEM_SIZE_PROP, OBJECT(&dev->vdev), + VIRTIO_MEM_SIZE_PROP); + object_property_add(obj, VIRTIO_MEM_REQUESTED_SIZE_PROP, "size", + virtio_ccw_mem_get_requested_size, + virtio_ccw_mem_set_requested_size, NULL, NULL); +} + +static const TypeInfo virtio_ccw_mem = { + .name = TYPE_VIRTIO_MEM_CCW, + .parent = TYPE_VIRTIO_MD_CCW, + .instance_size = sizeof(VirtIOMEMCcw), + .instance_init = virtio_ccw_mem_instance_init, + .class_init = virtio_ccw_mem_class_init, +}; + +static void virtio_ccw_mem_register_types(void) +{ + type_register_static(&virtio_ccw_mem); +} +type_init(virtio_ccw_mem_register_types) |