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hostmem-memfd: add checks before adding hostmem-memfd & properties

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Run some memfd-related checks before registering hostmem-memfd &
various properties. This will help libvirt to figure out what the host
is supposed to be capable of.

qemu_memfd_check() is changed to a less optimized version, since it is
used with various flags, it no longer caches the result.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180906161415.8543-1-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-09-06 20:14:15 +04:00 • committed by Paolo Bonzini
parent 7184de64a1
commit 3829640049
4 changed files with 46 additions and 47 deletions
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32
backends/hostmem-memfd.c
View file

@ -140,18 +140,22 @@ memfd_backend_class_init(ObjectClass *oc, void *data)
bc->alloc = memfd_backend_memory_alloc;
object_class_property_add_bool(oc, "hugetlb",
memfd_backend_get_hugetlb,
memfd_backend_set_hugetlb,
&error_abort);
object_class_property_add(oc, "hugetlbsize", "int",
memfd_backend_get_hugetlbsize,
memfd_backend_set_hugetlbsize,
NULL, NULL, &error_abort);
object_class_property_add_bool(oc, "seal",
memfd_backend_get_seal,
memfd_backend_set_seal,
&error_abort);
if (qemu_memfd_check(MFD_HUGETLB)) {
object_class_property_add_bool(oc, "hugetlb",
memfd_backend_get_hugetlb,
memfd_backend_set_hugetlb,
&error_abort);
object_class_property_add(oc, "hugetlbsize", "int",
memfd_backend_get_hugetlbsize,
memfd_backend_set_hugetlbsize,
NULL, NULL, &error_abort);
}
if (qemu_memfd_check(MFD_ALLOW_SEALING)) {
object_class_property_add_bool(oc, "seal",
memfd_backend_get_seal,
memfd_backend_set_seal,
&error_abort);
}
}
static const TypeInfo memfd_backend_info = {
@ -164,7 +168,9 @@ static const TypeInfo memfd_backend_info = {
static void register_types(void)
{
type_register_static(&memfd_backend_info);
if (qemu_memfd_check(0)) {
type_register_static(&memfd_backend_info);
}
}
type_init(register_types);