2014-06-06 17:54:29 +02:00
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/*
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* QEMU Host Memory Backend
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*
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* Copyright (C) 2013-2014 Red Hat Inc
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*
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* Authors:
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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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2016-06-29 10:12:57 +02:00
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#ifndef SYSEMU_HOSTMEM_H
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#define SYSEMU_HOSTMEM_H
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2014-06-06 17:54:29 +02:00
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2019-08-12 07:23:55 +02:00
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#include "sysemu/numa.h"
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2019-06-19 22:10:41 +02:00
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#include "qapi/qapi-types-machine.h"
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2014-06-06 17:54:29 +02:00
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#include "qom/object.h"
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#include "exec/memory.h"
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2014-06-10 13:15:25 +02:00
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#include "qemu/bitmap.h"
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2014-06-06 17:54:29 +02:00
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#define TYPE_MEMORY_BACKEND "memory-backend"
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2020-08-31 23:07:37 +02:00
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OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass,
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memory_backend, MEMORY_BACKEND)
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2014-06-06 17:54:29 +02:00
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2020-02-19 17:08:37 +01:00
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/* hostmem-ram.c */
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/**
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* @TYPE_MEMORY_BACKEND_RAM:
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* name of backend that uses mmap on the anonymous RAM
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*/
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#define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
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/* hostmem-file.c */
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/**
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* @TYPE_MEMORY_BACKEND_FILE:
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* name of backend that uses mmap on a file descriptor
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*/
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#define TYPE_MEMORY_BACKEND_FILE "memory-backend-file"
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2014-06-06 17:54:29 +02:00
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/**
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* HostMemoryBackendClass:
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* @parent_class: opaque parent class container
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*/
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struct HostMemoryBackendClass {
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ObjectClass parent_class;
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2014-06-10 13:15:19 +02:00
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void (*alloc)(HostMemoryBackend *backend, Error **errp);
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2014-06-06 17:54:29 +02:00
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};
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/**
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* @HostMemoryBackend
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*
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* @parent: opaque parent object container
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* @size: amount of memory backend provides
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* @mr: MemoryRegion representing host memory belonging to backend
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2020-02-19 17:09:50 +01:00
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* @prealloc_threads: number of threads to be used for preallocatining RAM
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2014-06-06 17:54:29 +02:00
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*/
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struct HostMemoryBackend {
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/* private */
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Object parent;
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/* protected */
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uint64_t size;
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hostmem: use object id for memory region name with >= 4.0
hostmem-file and hostmem-memfd use the whole object path for the
memory region name, and hostname-ram uses only the path component (the
object id, or canonical path basename):
qemu -m 1024 -object memory-backend-file,id=mem,size=1G,mem-path=/tmp/foo -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
/objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
qemu -m 1024 -object memory-backend-memfd,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
/objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
qemu -m 1024 -object memory-backend-ram,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
For consistency, change to use object id for -file and -memfd as well
with >= 4.0.
Having a consistent naming allows to migrate to different hostmem
backends.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
2018-09-12 14:18:00 +02:00
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bool merge, dump, use_canonical_path;
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2020-02-19 17:09:51 +01:00
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bool prealloc, is_mapped, share;
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2020-02-19 17:09:50 +01:00
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uint32_t prealloc_threads;
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2014-06-10 13:15:25 +02:00
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DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
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HostMemPolicy policy;
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2014-06-06 17:54:29 +02:00
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MemoryRegion mr;
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};
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2017-03-10 14:09:29 +01:00
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bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
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2018-06-19 15:41:36 +02:00
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MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
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2014-06-06 17:54:29 +02:00
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2016-07-13 06:18:06 +02:00
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void host_memory_backend_set_mapped(HostMemoryBackend *backend, bool mapped);
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bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
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2018-04-03 07:05:45 +02:00
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size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
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hostmem: use object id for memory region name with >= 4.0
hostmem-file and hostmem-memfd use the whole object path for the
memory region name, and hostname-ram uses only the path component (the
object id, or canonical path basename):
qemu -m 1024 -object memory-backend-file,id=mem,size=1G,mem-path=/tmp/foo -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
/objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
qemu -m 1024 -object memory-backend-memfd,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
/objects/mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
qemu -m 1024 -object memory-backend-ram,id=mem,size=1G -numa node,memdev=mem -monitor stdio
(qemu) info ramblock
Block Name PSize Offset Used Total
mem 4 KiB 0x0000000000000000 0x0000000040000000 0x0000000040000000
For consistency, change to use object id for -file and -memfd as well
with >= 4.0.
Having a consistent naming allows to migrate to different hostmem
backends.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
2018-09-12 14:18:00 +02:00
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char *host_memory_backend_get_name(HostMemoryBackend *backend);
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2018-04-03 07:05:45 +02:00
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2014-06-06 17:54:29 +02:00
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#endif
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