Registering the memory region for migration has do be done by the owner. There could be cases, where we don't want to migrate the memory. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20180423165126.15441-8-david@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
276 lines
8.3 KiB
C
276 lines
8.3 KiB
C
/*
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* Memory Device Interface
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*
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* Copyright ProfitBricks GmbH 2012
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* Copyright (C) 2014 Red Hat Inc
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* Copyright (c) 2018 Red Hat Inc
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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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/mem/memory-device.h"
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#include "hw/qdev.h"
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#include "qapi/error.h"
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#include "hw/boards.h"
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#include "qemu/range.h"
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#include "hw/virtio/vhost.h"
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#include "sysemu/kvm.h"
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static gint memory_device_addr_sort(gconstpointer a, gconstpointer b)
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{
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const MemoryDeviceState *md_a = MEMORY_DEVICE(a);
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const MemoryDeviceState *md_b = MEMORY_DEVICE(b);
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const MemoryDeviceClass *mdc_a = MEMORY_DEVICE_GET_CLASS(a);
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const MemoryDeviceClass *mdc_b = MEMORY_DEVICE_GET_CLASS(b);
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const uint64_t addr_a = mdc_a->get_addr(md_a);
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const uint64_t addr_b = mdc_b->get_addr(md_b);
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if (addr_a > addr_b) {
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return 1;
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} else if (addr_a < addr_b) {
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return -1;
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}
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return 0;
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}
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static int memory_device_build_list(Object *obj, void *opaque)
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{
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GSList **list = opaque;
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if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
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DeviceState *dev = DEVICE(obj);
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if (dev->realized) { /* only realized memory devices matter */
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*list = g_slist_insert_sorted(*list, dev, memory_device_addr_sort);
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}
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}
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object_child_foreach(obj, memory_device_build_list, opaque);
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return 0;
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}
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static int memory_device_used_region_size(Object *obj, void *opaque)
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{
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uint64_t *size = opaque;
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if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
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const DeviceState *dev = DEVICE(obj);
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const MemoryDeviceState *md = MEMORY_DEVICE(obj);
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const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj);
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if (dev->realized) {
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*size += mdc->get_region_size(md);
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}
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}
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object_child_foreach(obj, memory_device_used_region_size, opaque);
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return 0;
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}
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static void memory_device_check_addable(MachineState *ms, uint64_t size,
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Error **errp)
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{
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uint64_t used_region_size = 0;
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/* we will need a new memory slot for kvm and vhost */
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if (kvm_enabled() && !kvm_has_free_slot(ms)) {
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error_setg(errp, "hypervisor has no free memory slots left");
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return;
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}
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if (!vhost_has_free_slot()) {
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error_setg(errp, "a used vhost backend has no free memory slots left");
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return;
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}
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/* will we exceed the total amount of memory specified */
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memory_device_used_region_size(OBJECT(ms), &used_region_size);
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if (used_region_size + size > ms->maxram_size - ms->ram_size) {
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error_setg(errp, "not enough space, currently 0x%" PRIx64
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" in use of total hot pluggable 0x" RAM_ADDR_FMT,
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used_region_size, ms->maxram_size - ms->ram_size);
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return;
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}
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}
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uint64_t memory_device_get_free_addr(MachineState *ms, const uint64_t *hint,
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uint64_t align, uint64_t size,
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Error **errp)
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{
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uint64_t address_space_start, address_space_end;
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GSList *list = NULL, *item;
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uint64_t new_addr = 0;
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if (!ms->device_memory) {
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error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
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"supported by the machine");
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return 0;
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}
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if (!memory_region_size(&ms->device_memory->mr)) {
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error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
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"enabled, please specify the maxmem option");
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return 0;
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}
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address_space_start = ms->device_memory->base;
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address_space_end = address_space_start +
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memory_region_size(&ms->device_memory->mr);
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g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start);
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g_assert(address_space_end >= address_space_start);
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memory_device_check_addable(ms, size, errp);
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if (*errp) {
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return 0;
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}
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if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
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error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
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align);
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return 0;
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}
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if (QEMU_ALIGN_UP(size, align) != size) {
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error_setg(errp, "backend memory size must be multiple of 0x%"
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PRIx64, align);
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return 0;
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}
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if (hint) {
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new_addr = *hint;
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if (new_addr < address_space_start) {
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error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
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"] at 0x%" PRIx64, new_addr, size, address_space_start);
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return 0;
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} else if ((new_addr + size) > address_space_end) {
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error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
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"] beyond 0x%" PRIx64, new_addr, size,
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address_space_end);
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return 0;
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}
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} else {
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new_addr = address_space_start;
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}
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/* find address range that will fit new memory device */
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object_child_foreach(OBJECT(ms), memory_device_build_list, &list);
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for (item = list; item; item = g_slist_next(item)) {
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const MemoryDeviceState *md = item->data;
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const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(OBJECT(md));
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uint64_t md_size, md_addr;
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md_addr = mdc->get_addr(md);
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md_size = mdc->get_region_size(md);
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if (*errp) {
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goto out;
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}
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if (ranges_overlap(md_addr, md_size, new_addr, size)) {
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if (hint) {
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const DeviceState *d = DEVICE(md);
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error_setg(errp, "address range conflicts with '%s'", d->id);
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goto out;
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}
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new_addr = QEMU_ALIGN_UP(md_addr + md_size, align);
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}
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}
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if (new_addr + size > address_space_end) {
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error_setg(errp, "could not find position in guest address space for "
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"memory device - memory fragmented due to alignments");
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goto out;
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}
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out:
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g_slist_free(list);
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return new_addr;
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}
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MemoryDeviceInfoList *qmp_memory_device_list(void)
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{
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GSList *devices = NULL, *item;
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MemoryDeviceInfoList *list = NULL, *prev = NULL;
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object_child_foreach(qdev_get_machine(), memory_device_build_list,
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&devices);
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for (item = devices; item; item = g_slist_next(item)) {
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const MemoryDeviceState *md = MEMORY_DEVICE(item->data);
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const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(item->data);
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MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
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MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
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mdc->fill_device_info(md, info);
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elem->value = info;
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elem->next = NULL;
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if (prev) {
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prev->next = elem;
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} else {
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list = elem;
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}
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prev = elem;
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}
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g_slist_free(devices);
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return list;
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}
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static int memory_device_plugged_size(Object *obj, void *opaque)
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{
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uint64_t *size = opaque;
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if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
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const DeviceState *dev = DEVICE(obj);
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const MemoryDeviceState *md = MEMORY_DEVICE(obj);
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const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj);
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if (dev->realized) {
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*size += mdc->get_plugged_size(md);
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}
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}
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object_child_foreach(obj, memory_device_plugged_size, opaque);
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return 0;
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}
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uint64_t get_plugged_memory_size(void)
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{
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uint64_t size = 0;
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memory_device_plugged_size(qdev_get_machine(), &size);
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return size;
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}
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void memory_device_plug_region(MachineState *ms, MemoryRegion *mr,
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uint64_t addr)
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{
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/* we expect a previous call to memory_device_get_free_addr() */
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g_assert(ms->device_memory);
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memory_region_add_subregion(&ms->device_memory->mr,
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addr - ms->device_memory->base, mr);
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}
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void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr)
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{
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/* we expect a previous call to memory_device_get_free_addr() */
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g_assert(ms->device_memory);
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memory_region_del_subregion(&ms->device_memory->mr, mr);
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}
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static const TypeInfo memory_device_info = {
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.name = TYPE_MEMORY_DEVICE,
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.parent = TYPE_INTERFACE,
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.class_size = sizeof(MemoryDeviceClass),
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};
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static void memory_device_register_types(void)
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{
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type_register_static(&memory_device_info);
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}
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type_init(memory_device_register_types)
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