06329ccecf
Currently only file backed memory backend can be created with a "share" flag in order to allow sharing guest RAM with other processes in the host. Add the "share" flag also to RAM Memory Backend in order to allow remapping parts of the guest RAM to different host virtual addresses. This is needed by the RDMA devices in order to remap non-contiguous QEMU virtual addresses to a contiguous virtual address range. Moved the "share" flag to the Host Memory base class, modified phys_mem_alloc to include the new parameter and a new interface memory_region_init_ram_shared_nomigrate. There are no functional changes if the new flag is not used. Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
|
|
* QEMU Host Memory Backend
|
|
*
|
|
* Copyright (C) 2013-2014 Red Hat Inc
|
|
*
|
|
* Authors:
|
|
* Igor Mammedov <imammedo@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
#include "qemu/osdep.h"
|
|
#include "sysemu/hostmem.h"
|
|
#include "qapi/error.h"
|
|
#include "qom/object_interfaces.h"
|
|
|
|
#define TYPE_MEMORY_BACKEND_RAM "memory-backend-ram"
|
|
|
|
|
|
static void
|
|
ram_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
|
|
{
|
|
char *path;
|
|
|
|
if (!backend->size) {
|
|
error_setg(errp, "can't create backend with size 0");
|
|
return;
|
|
}
|
|
|
|
path = object_get_canonical_path_component(OBJECT(backend));
|
|
memory_region_init_ram_shared_nomigrate(&backend->mr, OBJECT(backend), path,
|
|
backend->size, backend->share, errp);
|
|
g_free(path);
|
|
}
|
|
|
|
static void
|
|
ram_backend_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
HostMemoryBackendClass *bc = MEMORY_BACKEND_CLASS(oc);
|
|
|
|
bc->alloc = ram_backend_memory_alloc;
|
|
}
|
|
|
|
static const TypeInfo ram_backend_info = {
|
|
.name = TYPE_MEMORY_BACKEND_RAM,
|
|
.parent = TYPE_MEMORY_BACKEND,
|
|
.class_init = ram_backend_class_init,
|
|
};
|
|
|
|
static void register_types(void)
|
|
{
|
|
type_register_static(&ram_backend_info);
|
|
}
|
|
|
|
type_init(register_types);
|