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6169f11936
Define the RAM_PRIVATE flag. In RAMBlock creation functions, if MAP_SHARED is 0 in the flags parameter, in a subsequent patch the implementation may still create a shared mapping if other conditions require it. Callers who specifically want a private mapping, eg for objects specified by the user, must pass RAM_PRIVATE. After RAMBlock creation, MAP_SHARED in the block's flags indicates whether the block is shared or private, and MAP_PRIVATE is omitted. Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Peter Xu <peterx@redhat.com> Link: https://lore.kernel.org/r/1736967650-129648-6-git-send-email-steven.sistare@oracle.com Signed-off-by: Fabiano Rosas <farosas@suse.de>
58 lines
1.5 KiB
C
58 lines
1.5 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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#include "qemu/osdep.h"
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#include "system/hostmem.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "qom/object_interfaces.h"
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static bool
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ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
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{
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g_autofree char *name = NULL;
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uint32_t ram_flags;
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if (!backend->size) {
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error_setg(errp, "can't create backend with size 0");
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return false;
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}
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name = host_memory_backend_get_name(backend);
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ram_flags = backend->share ? RAM_SHARED : RAM_PRIVATE;
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ram_flags |= backend->reserve ? 0 : RAM_NORESERVE;
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ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0;
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return memory_region_init_ram_flags_nomigrate(&backend->mr, OBJECT(backend),
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name, backend->size,
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ram_flags, errp);
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}
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static void
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ram_backend_class_init(ObjectClass *oc, void *data)
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{
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HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
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bc->alloc = ram_backend_memory_alloc;
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}
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static const TypeInfo ram_backend_info = {
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.name = TYPE_MEMORY_BACKEND_RAM,
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.parent = TYPE_MEMORY_BACKEND,
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.class_init = ram_backend_class_init,
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};
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static void register_types(void)
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{
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type_register_static(&ram_backend_info);
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}
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type_init(register_types);
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