hw/mem/memory-device.c - qemu - Git at Google

 /*
  * 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 "hw/mem/memory-device.h"
 #include "hw/qdev.h"
 #include "qapi/error.h"
 #include "hw/boards.h"
 #include "qemu/range.h"
 #include "hw/virtio/vhost.h"
 #include "sysemu/kvm.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);
         const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj);

         if (dev->realized) {
             *size += mdc->get_region_size(md);
         }
     }

     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 > ms->maxram_size - ms->ram_size) {
         error_setg(errp, "not enough space, currently 0x%" PRIx64
                    " in use of total hot pluggable 0x" RAM_ADDR_FMT,
                    used_region_size, ms->maxram_size - ms->ram_size);
         return;
     }

 }

 uint64_t memory_device_get_free_addr(MachineState *ms, const uint64_t *hint,
                                      uint64_t align, uint64_t size,
                                      Error **errp)
 {
     uint64_t address_space_start, address_space_end;
     GSList *list = NULL, *item;
     uint64_t new_addr = 0;

     if (!ms->device_memory) {
         error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
                          "supported by the machine");
         return 0;
     }

     if (!memory_region_size(&ms->device_memory->mr)) {
         error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
                          "enabled, please specify the maxmem option");
         return 0;
     }
     address_space_start = ms->device_memory->base;
     address_space_end = address_space_start +
                         memory_region_size(&ms->device_memory->mr);
     g_assert(address_space_end >= address_space_start);

     /* address_space_start indicates the maximum alignment we expect */
     if (QEMU_ALIGN_UP(address_space_start, align) != address_space_start) {
         error_setg(errp, "the alignment (0x%" PRIx64 ") is not supported",
                    align);
         return 0;
     }

     memory_device_check_addable(ms, size, errp);
     if (*errp) {
         return 0;
     }

     if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
         error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
                    align);
         return 0;
     }

     if (QEMU_ALIGN_UP(size, align) != size) {
         error_setg(errp, "backend memory size must be multiple of 0x%"
                    PRIx64, align);
         return 0;
     }

     if (hint) {
         new_addr = *hint;
         if (new_addr < address_space_start) {
             error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
                        "] before 0x%" PRIx64, new_addr, size,
                        address_space_start);
             return 0;
         } else if ((new_addr + size) > address_space_end) {
             error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
                        "] beyond 0x%" PRIx64, new_addr, size,
                        address_space_end);
             return 0;
         }
     } else {
         new_addr = address_space_start;
     }

     /* 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 md_size, md_addr;

         md_addr = mdc->get_addr(md);
         md_size = mdc->get_region_size(md);
         if (*errp) {
             goto out;
         }

         if (ranges_overlap(md_addr, md_size, new_addr, size)) {
             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;
             }
             new_addr = QEMU_ALIGN_UP(md_addr + md_size, align);
         }
     }

     if (new_addr + size > address_space_end) {
         error_setg(errp, "could not find position in guest address space for "
                    "memory device - memory fragmented due to alignments");
         goto out;
     }
 out:
     g_slist_free(list);
     return new_addr;
 }

 MemoryDeviceInfoList *qmp_memory_device_list(void)
 {
     GSList *devices = NULL, *item;
     MemoryDeviceInfoList *list = NULL, *prev = NULL;

     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);
         MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
         MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);

         mdc->fill_device_info(md, info);

         elem->value = info;
         elem->next = NULL;
         if (prev) {
             prev->next = elem;
         } else {
             list = elem;
         }
         prev = elem;
     }

     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);
         }
     }

     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_plug_region(MachineState *ms, MemoryRegion *mr,
                                uint64_t addr)
 {
     /* we expect a previous call to memory_device_get_free_addr() */
     g_assert(ms->device_memory);

     memory_region_add_subregion(&ms->device_memory->mr,
                                 addr - ms->device_memory->base, mr);
 }

 void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr)
 {
     /* we expect a previous call to memory_device_get_free_addr() */
     g_assert(ms->device_memory);

     memory_region_del_subregion(&ms->device_memory->mr, 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)
	/*
	* 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 "hw/mem/memory-device.h"
	#include "hw/qdev.h"
	#include "qapi/error.h"
	#include "hw/boards.h"
	#include "qemu/range.h"
	#include "hw/virtio/vhost.h"
	#include "sysemu/kvm.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);
	const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(obj);

	if (dev->realized) {
	*size += mdc->get_region_size(md);
	}
	}

	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 > ms->maxram_size - ms->ram_size) {
	error_setg(errp, "not enough space, currently 0x%" PRIx64
	" in use of total hot pluggable 0x" RAM_ADDR_FMT,
	used_region_size, ms->maxram_size - ms->ram_size);
	return;
	}

	}

	uint64_t memory_device_get_free_addr(MachineState ms, const uint64_t hint,
	uint64_t align, uint64_t size,
	Error **errp)
	{
	uint64_t address_space_start, address_space_end;
	GSList list = NULL, item;
	uint64_t new_addr = 0;

	if (!ms->device_memory) {
	error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
	"supported by the machine");
	return 0;
	}

	if (!memory_region_size(&ms->device_memory->mr)) {
	error_setg(errp, "memory devices (e.g. for memory hotplug) are not "
	"enabled, please specify the maxmem option");
	return 0;
	}
	address_space_start = ms->device_memory->base;
	address_space_end = address_space_start +
	memory_region_size(&ms->device_memory->mr);
	g_assert(address_space_end >= address_space_start);

	/* address_space_start indicates the maximum alignment we expect */
	if (QEMU_ALIGN_UP(address_space_start, align) != address_space_start) {
	error_setg(errp, "the alignment (0x%" PRIx64 ") is not supported",
	align);
	return 0;
	}

	memory_device_check_addable(ms, size, errp);
	if (*errp) {
	return 0;
	}

	if (hint && QEMU_ALIGN_UP(hint, align) != hint) {
	error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
	align);
	return 0;
	}

	if (QEMU_ALIGN_UP(size, align) != size) {
	error_setg(errp, "backend memory size must be multiple of 0x%"
	PRIx64, align);
	return 0;
	}

	if (hint) {
	new_addr = *hint;
	if (new_addr < address_space_start) {
	error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
	"] before 0x%" PRIx64, new_addr, size,
	address_space_start);
	return 0;
	} else if ((new_addr + size) > address_space_end) {
	error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
	"] beyond 0x%" PRIx64, new_addr, size,
	address_space_end);
	return 0;
	}
	} else {
	new_addr = address_space_start;
	}

	/* 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 md_size, md_addr;

	md_addr = mdc->get_addr(md);
	md_size = mdc->get_region_size(md);
	if (*errp) {
	goto out;
	}

	if (ranges_overlap(md_addr, md_size, new_addr, size)) {
	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;
	}
	new_addr = QEMU_ALIGN_UP(md_addr + md_size, align);
	}
	}

	if (new_addr + size > address_space_end) {
	error_setg(errp, "could not find position in guest address space for "
	"memory device - memory fragmented due to alignments");
	goto out;
	}
	out:
	g_slist_free(list);
	return new_addr;
	}

	MemoryDeviceInfoList *qmp_memory_device_list(void)
	{
	GSList devices = NULL, item;
	MemoryDeviceInfoList list = NULL, prev = NULL;

	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);
	MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
	MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);

	mdc->fill_device_info(md, info);

	elem->value = info;
	elem->next = NULL;
	if (prev) {
	prev->next = elem;
	} else {
	list = elem;
	}
	prev = elem;
	}

	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);
	}
	}

	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_plug_region(MachineState ms, MemoryRegion mr,
	uint64_t addr)
	{
	/* we expect a previous call to memory_device_get_free_addr() */
	g_assert(ms->device_memory);

	memory_region_add_subregion(&ms->device_memory->mr,
	addr - ms->device_memory->base, mr);
	}

	void memory_device_unplug_region(MachineState ms, MemoryRegion mr)
	{
	/* we expect a previous call to memory_device_get_free_addr() */
	g_assert(ms->device_memory);

	memory_region_del_subregion(&ms->device_memory->mr, 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)