184 lines
5.3 KiB
C
184 lines
5.3 KiB
C
/*
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* QEMU host memfd memory backend
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*
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* Copyright (C) 2018 Red Hat Inc
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*
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* Authors:
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* Marc-André Lureau <marcandre.lureau@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 "qemu-common.h"
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#include "sysemu/hostmem.h"
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#include "sysemu/sysemu.h"
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#include "qom/object_interfaces.h"
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#include "qemu/memfd.h"
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#include "qapi/error.h"
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#define TYPE_MEMORY_BACKEND_MEMFD "memory-backend-memfd"
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#define MEMORY_BACKEND_MEMFD(obj) \
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OBJECT_CHECK(HostMemoryBackendMemfd, (obj), TYPE_MEMORY_BACKEND_MEMFD)
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typedef struct HostMemoryBackendMemfd HostMemoryBackendMemfd;
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struct HostMemoryBackendMemfd {
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HostMemoryBackend parent_obj;
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bool hugetlb;
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uint64_t hugetlbsize;
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bool seal;
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};
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static void
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memfd_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
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{
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HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(backend);
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char *name;
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int fd;
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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;
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}
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backend->force_prealloc = mem_prealloc;
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fd = qemu_memfd_create(TYPE_MEMORY_BACKEND_MEMFD, backend->size,
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m->hugetlb, m->hugetlbsize, m->seal ?
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F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL : 0,
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errp);
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if (fd == -1) {
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return;
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}
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name = object_get_canonical_path(OBJECT(backend));
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memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend),
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name, backend->size,
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backend->share, fd, errp);
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g_free(name);
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}
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static bool
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memfd_backend_get_hugetlb(Object *o, Error **errp)
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{
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return MEMORY_BACKEND_MEMFD(o)->hugetlb;
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}
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static void
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memfd_backend_set_hugetlb(Object *o, bool value, Error **errp)
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{
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MEMORY_BACKEND_MEMFD(o)->hugetlb = value;
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}
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static void
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memfd_backend_set_hugetlbsize(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj);
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Error *local_err = NULL;
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uint64_t value;
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if (host_memory_backend_mr_inited(MEMORY_BACKEND(obj))) {
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error_setg(&local_err, "cannot change property value");
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goto out;
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}
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visit_type_size(v, name, &value, &local_err);
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if (local_err) {
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goto out;
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}
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if (!value) {
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error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
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PRIu64 "'", object_get_typename(obj), name, value);
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goto out;
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}
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m->hugetlbsize = value;
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out:
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error_propagate(errp, local_err);
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}
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static void
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memfd_backend_get_hugetlbsize(Object *obj, Visitor *v, const char *name,
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void *opaque, Error **errp)
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{
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HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj);
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uint64_t value = m->hugetlbsize;
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visit_type_size(v, name, &value, errp);
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}
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static bool
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memfd_backend_get_seal(Object *o, Error **errp)
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{
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return MEMORY_BACKEND_MEMFD(o)->seal;
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}
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static void
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memfd_backend_set_seal(Object *o, bool value, Error **errp)
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{
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MEMORY_BACKEND_MEMFD(o)->seal = value;
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}
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static void
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memfd_backend_instance_init(Object *obj)
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{
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HostMemoryBackendMemfd *m = MEMORY_BACKEND_MEMFD(obj);
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/* default to sealed file */
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m->seal = true;
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MEMORY_BACKEND(m)->share = true;
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}
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static void
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memfd_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 = memfd_backend_memory_alloc;
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if (qemu_memfd_check(MFD_HUGETLB)) {
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object_class_property_add_bool(oc, "hugetlb",
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memfd_backend_get_hugetlb,
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memfd_backend_set_hugetlb,
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&error_abort);
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object_class_property_set_description(oc, "hugetlb",
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"Use huge pages",
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&error_abort);
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object_class_property_add(oc, "hugetlbsize", "int",
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memfd_backend_get_hugetlbsize,
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memfd_backend_set_hugetlbsize,
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NULL, NULL, &error_abort);
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object_class_property_set_description(oc, "hugetlbsize",
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"Huge pages size (ex: 2M, 1G)",
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&error_abort);
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}
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if (qemu_memfd_check(MFD_ALLOW_SEALING)) {
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object_class_property_add_bool(oc, "seal",
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memfd_backend_get_seal,
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memfd_backend_set_seal,
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&error_abort);
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object_class_property_set_description(oc, "seal",
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"Seal growing & shrinking",
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&error_abort);
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}
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}
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static const TypeInfo memfd_backend_info = {
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.name = TYPE_MEMORY_BACKEND_MEMFD,
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.parent = TYPE_MEMORY_BACKEND,
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.instance_init = memfd_backend_instance_init,
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.class_init = memfd_backend_class_init,
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.instance_size = sizeof(HostMemoryBackendMemfd),
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};
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static void register_types(void)
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{
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if (qemu_memfd_check(0)) {
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type_register_static(&memfd_backend_info);
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}
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}
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type_init(register_types);
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