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We will factor out get_memory_region() from pc-dimm to memory device code soon. Once that is done, get_region_size() can be implemented generically and essentially be replaced by memory_device_get_region_size (and work only on get_memory_region()). We have some users of get_memory_region() (spapr and pc-dimm code) that are only interested in the size. So let's rework them to use memory_device_get_region_size() first, then we can factor out get_memory_region() and eventually remove get_region_size() without touching the same code multiple times. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20181005092024.14344-10-david@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/*
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* Memory Device Interface
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*
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* Copyright (c) 2018 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 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef MEMORY_DEVICE_H
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#define MEMORY_DEVICE_H
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#include "qom/object.h"
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#include "hw/qdev.h"
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#define TYPE_MEMORY_DEVICE "memory-device"
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#define MEMORY_DEVICE_CLASS(klass) \
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OBJECT_CLASS_CHECK(MemoryDeviceClass, (klass), TYPE_MEMORY_DEVICE)
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#define MEMORY_DEVICE_GET_CLASS(obj) \
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OBJECT_GET_CLASS(MemoryDeviceClass, (obj), TYPE_MEMORY_DEVICE)
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#define MEMORY_DEVICE(obj) \
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INTERFACE_CHECK(MemoryDeviceState, (obj), TYPE_MEMORY_DEVICE)
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typedef struct MemoryDeviceState {
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Object parent_obj;
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} MemoryDeviceState;
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/**
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* MemoryDeviceClass:
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*
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* All memory devices need to implement TYPE_MEMORY_DEVICE as an interface.
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*
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* A memory device is a device that owns a memory region which is
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* mapped into guest physical address space at a certain address. The
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* address in guest physical memory can either be specified explicitly
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* or get assigned automatically.
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*/
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typedef struct MemoryDeviceClass {
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/* private */
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InterfaceClass parent_class;
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/*
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* Return the address of the memory device in guest physical memory.
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*
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* Called when (un)plugging a memory device or when iterating over
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* all memory devices mapped into guest physical address space.
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*
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* If "0" is returned, no address has been specified by the user and
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* no address has been assigned to this memory device yet.
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*/
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uint64_t (*get_addr)(const MemoryDeviceState *md);
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/*
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* Return the amount of memory provided by the memory device currently
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* usable ("plugged") by the VM.
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*
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* Called when calculating the total amount of ram available to the
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* VM (e.g. to report memory stats to the user).
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*
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* This is helpful for devices that dynamically manage the amount of
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* memory accessible by the guest via the reserved memory region. For
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* most devices, this corresponds to the size of the memory region.
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*/
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uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp);
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uint64_t (*get_region_size)(const MemoryDeviceState *md, Error **errp);
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/*
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* Translate the memory device into #MemoryDeviceInfo.
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*/
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void (*fill_device_info)(const MemoryDeviceState *md,
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MemoryDeviceInfo *info);
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} MemoryDeviceClass;
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MemoryDeviceInfoList *qmp_memory_device_list(void);
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uint64_t get_plugged_memory_size(void);
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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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void memory_device_plug_region(MachineState *ms, MemoryRegion *mr,
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uint64_t addr);
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void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr);
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uint64_t memory_device_get_region_size(const MemoryDeviceState *md,
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Error **errp);
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#endif
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