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qemu/hw/mem/memory-device.c
David Hildenbrand cc0afd8a72 memory-device: Introduce machine_memory_devices_init() 
Let's intrduce a new helper that we will use to replace existing memory
device setup code during machine initialization. We'll enforce that the
size has to be > 0.

Once all machines were converted, we'll only allocate ms->device_memory
if the size > 0.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20230623124553.400585-3-david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
2023-07-12 09:25:35 +02:00

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/*
* Memory Device Interface
*
* Copyright ProfitBricks GmbH 2012
* Copyright (C) 2014 Red Hat Inc
* Copyright (c) 2018 Red Hat Inc
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "hw/mem/memory-device.h"
#include "qapi/error.h"
#include "hw/boards.h"
#include "qemu/range.h"
#include "hw/virtio/vhost.h"
#include "sysemu/kvm.h"
#include "exec/address-spaces.h"
#include "trace.h"
static gint memory_device_addr_sort(gconstpointer a, gconstpointer b)
{
const MemoryDeviceState *md_a = MEMORY_DEVICE(a);
const MemoryDeviceState *md_b = MEMORY_DEVICE(b);
const MemoryDeviceClass *mdc_a = MEMORY_DEVICE_GET_CLASS(a);
const MemoryDeviceClass *mdc_b = MEMORY_DEVICE_GET_CLASS(b);
const uint64_t addr_a = mdc_a->get_addr(md_a);
const uint64_t addr_b = mdc_b->get_addr(md_b);
if (addr_a > addr_b) {
return 1;
} else if (addr_a < addr_b) {
return -1;
}
return 0;
}
static int memory_device_build_list(Object *obj, void *opaque)
{
GSList **list = opaque;
if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
DeviceState *dev = DEVICE(obj);
if (dev->realized) { /* only realized memory devices matter */
*list = g_slist_insert_sorted(*list, dev, memory_device_addr_sort);
}
}
object_child_foreach(obj, memory_device_build_list, opaque);
return 0;
}
static int memory_device_used_region_size(Object *obj, void *opaque)
{
uint64_t *size = opaque;
if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
const DeviceState *dev = DEVICE(obj);
const MemoryDeviceState *md = MEMORY_DEVICE(obj);
if (dev->realized) {
*size += memory_device_get_region_size(md, &error_abort);
}
}
object_child_foreach(obj, memory_device_used_region_size, opaque);
return 0;
}
static void memory_device_check_addable(MachineState *ms, uint64_t size,
Error **errp)
{
uint64_t used_region_size = 0;
/* we will need a new memory slot for kvm and vhost */
if (kvm_enabled() && !kvm_has_free_slot(ms)) {
error_setg(errp, "hypervisor has no free memory slots left");
return;
}
if (!vhost_has_free_slot()) {
error_setg(errp, "a used vhost backend has no free memory slots left");
return;
}
/* will we exceed the total amount of memory specified */
memory_device_used_region_size(OBJECT(ms), &used_region_size);
if (used_region_size + size < used_region_size ||
used_region_size + size > ms->maxram_size - ms->ram_size) {
error_setg(errp, "not enough space, currently 0x%" PRIx64
" in use of total space for memory devices 0x" RAM_ADDR_FMT,
used_region_size, ms->maxram_size - ms->ram_size);
return;
}
}
static uint64_t memory_device_get_free_addr(MachineState *ms,
const uint64_t *hint,
uint64_t align, uint64_t size,
Error **errp)
{
Error *err = NULL;
GSList *list = NULL, *item;
Range as, new = range_empty;
if (!ms->device_memory || !memory_region_size(&ms->device_memory->mr)) {
error_setg(errp, "the configuration is not prepared for memory devices"
" (e.g., for memory hotplug), consider specifying the"
" maxmem option");
return 0;
}
range_init_nofail(&as, ms->device_memory->base,
memory_region_size(&ms->device_memory->mr));
/* start of address space indicates the maximum alignment we expect */
if (!QEMU_IS_ALIGNED(range_lob(&as), align)) {
warn_report("the alignment (0x%" PRIx64 ") exceeds the expected"
" maximum alignment, memory will get fragmented and not"
" all 'maxmem' might be usable for memory devices.",
align);
}
memory_device_check_addable(ms, size, &err);
if (err) {
error_propagate(errp, err);
return 0;
}
if (hint && !QEMU_IS_ALIGNED(*hint, align)) {
error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
align);
return 0;
}
if (!QEMU_IS_ALIGNED(size, align)) {
error_setg(errp, "backend memory size must be multiple of 0x%"
PRIx64, align);
return 0;
}
if (hint) {
if (range_init(&new, *hint, size) || !range_contains_range(&as, &new)) {
error_setg(errp, "can't add memory device [0x%" PRIx64 ":0x%" PRIx64
"], usable range for memory devices [0x%" PRIx64 ":0x%"
PRIx64 "]", *hint, size, range_lob(&as),
range_size(&as));
return 0;
}
} else {
if (range_init(&new, QEMU_ALIGN_UP(range_lob(&as), align), size)) {
error_setg(errp, "can't add memory device, device too big");
return 0;
}
}
/* find address range that will fit new memory device */
object_child_foreach(OBJECT(ms), memory_device_build_list, &list);
for (item = list; item; item = g_slist_next(item)) {
const MemoryDeviceState *md = item->data;
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(OBJECT(md));
uint64_t next_addr;
Range tmp;
range_init_nofail(&tmp, mdc->get_addr(md),
memory_device_get_region_size(md, &error_abort));
if (range_overlaps_range(&tmp, &new)) {
if (hint) {
const DeviceState *d = DEVICE(md);
error_setg(errp, "address range conflicts with memory device"
" id='%s'", d->id ? d->id : "(unnamed)");
goto out;
}
next_addr = QEMU_ALIGN_UP(range_upb(&tmp) + 1, align);
if (!next_addr || range_init(&new, next_addr, range_size(&new))) {
range_make_empty(&new);
break;
}
} else if (range_lob(&tmp) > range_upb(&new)) {
break;
}
}
if (!range_contains_range(&as, &new)) {
error_setg(errp, "could not find position in guest address space for "
"memory device - memory fragmented due to alignments");
}
out:
g_slist_free(list);
return range_lob(&new);
}
MemoryDeviceInfoList *qmp_memory_device_list(void)
{
GSList *devices = NULL, *item;
MemoryDeviceInfoList *list = NULL, **tail = &list;
object_child_foreach(qdev_get_machine(), memory_device_build_list,
&devices);
for (item = devices; item; item = g_slist_next(item)) {
const MemoryDeviceState *md = MEMORY_DEVICE(item->data);
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(item->data);
MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
mdc->fill_device_info(md, info);
QAPI_LIST_APPEND(tail, info);
}
g_slist_free(devices);
return list;
}
static int memory_device_plugged_size(Object *obj, void *opaque)
{
uint64_t *size = opaque;
if (object_dynamic_cast(obj, TYPE_MEMORY_DEVICE)) {
const DeviceState *dev = DEVICE(obj);
const MemoryDeviceState *md = MEMORY_DEVICE(obj);
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj);
if (dev->realized) {
*size += mdc->get_plugged_size(md, &error_abort);
}
}
object_child_foreach(obj, memory_device_plugged_size, opaque);
return 0;
}
uint64_t get_plugged_memory_size(void)
{
uint64_t size = 0;
memory_device_plugged_size(qdev_get_machine(), &size);
return size;
}
void memory_device_pre_plug(MemoryDeviceState *md, MachineState *ms,
const uint64_t *legacy_align, Error **errp)
{
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
Error *local_err = NULL;
uint64_t addr, align = 0;
MemoryRegion *mr;
mr = mdc->get_memory_region(md, &local_err);
if (local_err) {
goto out;
}
if (legacy_align) {
align = *legacy_align;
} else {
if (mdc->get_min_alignment) {
align = mdc->get_min_alignment(md);
}
align = MAX(align, memory_region_get_alignment(mr));
}
addr = mdc->get_addr(md);
addr = memory_device_get_free_addr(ms, !addr ? NULL : &addr, align,
memory_region_size(mr), &local_err);
if (local_err) {
goto out;
}
mdc->set_addr(md, addr, &local_err);
if (!local_err) {
trace_memory_device_pre_plug(DEVICE(md)->id ? DEVICE(md)->id : "",
addr);
}
out:
error_propagate(errp, local_err);
}
void memory_device_plug(MemoryDeviceState *md, MachineState *ms)
{
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
const uint64_t addr = mdc->get_addr(md);
MemoryRegion *mr;
/*
* We expect that a previous call to memory_device_pre_plug() succeeded, so
* it can't fail at this point.
*/
mr = mdc->get_memory_region(md, &error_abort);
g_assert(ms->device_memory);
memory_region_add_subregion(&ms->device_memory->mr,
addr - ms->device_memory->base, mr);
trace_memory_device_plug(DEVICE(md)->id ? DEVICE(md)->id : "", addr);
}
void memory_device_unplug(MemoryDeviceState *md, MachineState *ms)
{
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
MemoryRegion *mr;
/*
* We expect that a previous call to memory_device_pre_plug() succeeded, so
* it can't fail at this point.
*/
mr = mdc->get_memory_region(md, &error_abort);
g_assert(ms->device_memory);
memory_region_del_subregion(&ms->device_memory->mr, mr);
trace_memory_device_unplug(DEVICE(md)->id ? DEVICE(md)->id : "",
mdc->get_addr(md));
}
uint64_t memory_device_get_region_size(const MemoryDeviceState *md,
Error **errp)
{
const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
MemoryRegion *mr;
/* dropping const here is fine as we don't touch the memory region */
mr = mdc->get_memory_region((MemoryDeviceState *)md, errp);
if (!mr) {
return 0;
}
return memory_region_size(mr);
}
void machine_memory_devices_init(MachineState *ms, hwaddr base, uint64_t size)
{
g_assert(size);
g_assert(!ms->device_memory);
ms->device_memory = g_new0(DeviceMemoryState, 1);
ms->device_memory->base = base;
memory_region_init(&ms->device_memory->mr, OBJECT(ms), "device-memory",
size);
memory_region_add_subregion(get_system_memory(), ms->device_memory->base,
&ms->device_memory->mr);
}
static const TypeInfo memory_device_info = {
.name = TYPE_MEMORY_DEVICE,
.parent = TYPE_INTERFACE,
.class_size = sizeof(MemoryDeviceClass),
};
static void memory_device_register_types(void)
{
type_register_static(&memory_device_info);
}
type_init(memory_device_register_types)
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