1a9867498d
This is in preparation for the next commit where the nitro-enclave machine type will need to instead use a memfd backend, for the built-in vhost-user-vsock device to work. Signed-off-by: Dorjoy Chowdhury <dorjoychy111@gmail.com> Reviewed-by: Alexander Graf <graf@amazon.com> Link: https://lore.kernel.org/r/20241008211727.49088-5-dorjoychy111@gmail.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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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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#ifndef SYSEMU_HOSTMEM_H
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#define SYSEMU_HOSTMEM_H
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#include "sysemu/numa.h"
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#include "qapi/qapi-types-machine.h"
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#include "qom/object.h"
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#include "exec/memory.h"
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#include "qemu/bitmap.h"
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#include "qemu/thread-context.h"
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#define TYPE_MEMORY_BACKEND "memory-backend"
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OBJECT_DECLARE_TYPE(HostMemoryBackend, HostMemoryBackendClass,
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MEMORY_BACKEND)
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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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#define TYPE_MEMORY_BACKEND_MEMFD "memory-backend-memfd"
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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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/**
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* alloc: Allocate memory from backend.
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*
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* @backend: the #HostMemoryBackend.
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* @errp: pointer to Error*, to store an error if it happens.
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*
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* Return: true on success, else false setting @errp with error.
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*/
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bool (*alloc)(HostMemoryBackend *backend, Error **errp);
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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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* @prealloc_threads: number of threads to be used for preallocatining RAM
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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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bool merge, dump, use_canonical_path;
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bool prealloc, is_mapped, share, reserve;
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bool guest_memfd, aligned;
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uint32_t prealloc_threads;
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ThreadContext *prealloc_context;
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DECLARE_BITMAP(host_nodes, MAX_NODES + 1);
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HostMemPolicy policy;
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MemoryRegion mr;
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};
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bool host_memory_backend_mr_inited(HostMemoryBackend *backend);
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MemoryRegion *host_memory_backend_get_memory(HostMemoryBackend *backend);
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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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size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
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char *host_memory_backend_get_name(HostMemoryBackend *backend);
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#endif
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