2cc0e2e814
On the qmp level, we already have the concept of memory devices:
"query-memory-devices"
Right now, we only support NVDIMM and PCDIMM.
We want to map other devices later into the address space of the guest.
Such device could e.g. be virtio devices. These devices will have a
guest memory range assigned but won't be exposed via e.g. ACPI. We want
to make them look like memory device, but not glued to pc-dimm.
Especially, it will not always be possible to have TYPE_PC_DIMM as a parent
class (e.g. virtio devices). Let's use an interface instead. As a first
part, convert handling of
- qmp_pc_dimm_device_list
- get_plugged_memory_size
to our new model. plug/unplug stuff etc. will follow later.
A memory device will have to provide the following functions:
- get_addr(): Necessary, as the property "addr" can e.g. not be used for
virtio devices (already defined).
- get_plugged_size(): The amount this device offers to the guest as of
now.
- get_region_size(): Because this can later on be bigger than the
plugged size.
- fill_device_info(): Fill MemoryDeviceInfo, e.g. for qmp.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180423165126.15441-2-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
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* PC DIMM device
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*
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* Copyright ProfitBricks GmbH 2012
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* Copyright (C) 2013-2014 Red Hat Inc
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*
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* Authors:
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* Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>
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* Igor Mammedov <imammedo@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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*/
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#ifndef QEMU_PC_DIMM_H
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#define QEMU_PC_DIMM_H
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#include "exec/memory.h"
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#include "sysemu/hostmem.h"
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#include "hw/qdev.h"
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#define TYPE_PC_DIMM "pc-dimm"
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#define PC_DIMM(obj) \
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OBJECT_CHECK(PCDIMMDevice, (obj), TYPE_PC_DIMM)
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#define PC_DIMM_CLASS(oc) \
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OBJECT_CLASS_CHECK(PCDIMMDeviceClass, (oc), TYPE_PC_DIMM)
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#define PC_DIMM_GET_CLASS(obj) \
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OBJECT_GET_CLASS(PCDIMMDeviceClass, (obj), TYPE_PC_DIMM)
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#define PC_DIMM_ADDR_PROP "addr"
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#define PC_DIMM_SLOT_PROP "slot"
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#define PC_DIMM_NODE_PROP "node"
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#define PC_DIMM_SIZE_PROP "size"
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#define PC_DIMM_MEMDEV_PROP "memdev"
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#define PC_DIMM_UNASSIGNED_SLOT -1
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/**
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* PCDIMMDevice:
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* @addr: starting guest physical address, where @PCDIMMDevice is mapped.
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* Default value: 0, means that address is auto-allocated.
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* @node: numa node to which @PCDIMMDevice is attached.
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* @slot: slot number into which @PCDIMMDevice is plugged in.
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* Default value: -1, means that slot is auto-allocated.
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* @hostmem: host memory backend providing memory for @PCDIMMDevice
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*/
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typedef struct PCDIMMDevice {
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/* private */
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DeviceState parent_obj;
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/* public */
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uint64_t addr;
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uint32_t node;
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int32_t slot;
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HostMemoryBackend *hostmem;
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} PCDIMMDevice;
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/**
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* PCDIMMDeviceClass:
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* @realize: called after common dimm is realized so that the dimm based
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* devices get the chance to do specified operations.
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* @get_memory_region: returns #MemoryRegion associated with @dimm which
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* is directly mapped into the physical address space of guest.
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* @get_vmstate_memory_region: returns #MemoryRegion which indicates the
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* memory of @dimm should be kept during live migration.
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*/
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typedef struct PCDIMMDeviceClass {
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/* private */
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DeviceClass parent_class;
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/* public */
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void (*realize)(PCDIMMDevice *dimm, Error **errp);
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MemoryRegion *(*get_memory_region)(PCDIMMDevice *dimm, Error **errp);
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MemoryRegion *(*get_vmstate_memory_region)(PCDIMMDevice *dimm);
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} PCDIMMDeviceClass;
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/**
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* MemoryHotplugState:
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* @base: address in guest physical address space where hotplug memory
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* address space begins.
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* @mr: hotplug memory address space container
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*/
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typedef struct MemoryHotplugState {
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hwaddr base;
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MemoryRegion mr;
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} MemoryHotplugState;
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uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
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uint64_t address_space_size,
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uint64_t *hint, uint64_t align, uint64_t size,
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Error **errp);
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int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
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uint64_t pc_existing_dimms_capacity(Error **errp);
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void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms,
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MemoryRegion *mr, uint64_t align, Error **errp);
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void pc_dimm_memory_unplug(DeviceState *dev, MemoryHotplugState *hpms,
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MemoryRegion *mr);
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#endif
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