* Marc-André Lureau (marcandre.lur...@gmail.com) wrote:
> Hi
>
> On Thu, Aug 22, 2019 at 4:20 PM Dr. David Alan Gilbert
> <dgilb...@redhat.com> wrote:
> >
> > * Marc-André Lureau (marcandre.lur...@redhat.com) wrote:
> > > Hi
> > >
> > > On Thu, Aug 22, 2019 at 3:41 PM Dr. David Alan Gilbert
> > > <dgilb...@redhat.com> wrote:
> > > >
> > > > * Marc-André Lureau (marcandre.lur...@redhat.com) wrote:
> > > > > Hi
> > > > >
> > > > > On Thu, Aug 22, 2019 at 2:56 PM Dr. David Alan Gilbert
> > > > > <dgilb...@redhat.com> wrote:
> > > > > >
> > > > > > * Marc-André Lureau (marcandre.lur...@redhat.com) wrote:
> > > > > > > When instanciated, this object will connect to the given D-Bus
> > > > > > > bus. During migration, it will take the data from
> > > > > > > org.qemu.VMState1
> > > > > > > instances.
> > > > > > >
> > > > > > > See documentation for further details.
> > > > > >
> > > > > > I'll leave the main review to someone who understands the details of
> > > > > > DBUS, however from the migration side:
> > > > > >
> > > > > > > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
> > > > > >
> > > > > > <snip>
> > > > > >
> > > > > > > +
> > > > > > > +static int
> > > > > > > +dbus_load_state(QEMUFile *f, void *opaque, int version_id)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(opaque);
> > > > > > > + uint8_t *data = NULL;
> > > > > > > + int ret = -1;
> > > > > > > + char id[256];
> > > > > > > + unsigned int size;
> > > > > >
> > > > > > Higher level question; do you actually need a separate ID, or does
> > > > > > the ID that's stored by the migration code in the section name
> > > > > > give you enough uniqueness?
> > > > >
> > > > >
> > > > > The ID stored in migration section name is based on the handler ID:
> > > > > TYPE_DBUS_VMSTATE "-" handler_id
> > > > >
> > > > > By design, handler_id must be unique (and documented as such).
> > > > >
> > > > > Do you see a problem with that approach?
> > > >
> > > > OK, so if that's unique, why do you need an 'id' stored here?
> > >
> > > Oh I see, that's mostly a relic of v1, where multiple ID
> > > "sub-sections" would exist for each helper.
> > >
> > > However, if we want to allow having several "sub-sections" again, that
> > > might come handy to keep compatibility. It may be better to have a
> > > simple version field for that instead.
> >
> > OK, that's fine
> >
> > > >
> > > > > >
> > > > > > > + if (qemu_get_counted_string(f, id) == 0) {
> > > > > > > + error_report("Invalid vmstate Id");
> > > > > > > + goto end;
> > > > > >
> > > > > > I generally prefer to include something telling me where the error
> > > > > > has
> > > > > > come from, just to make it easier to track down if I see the error
> > > > > > in
> > > > > > a log; e.g. use __func__
> > > > >
> > > > > ok
> > > > >
> > > > > >
> > > > > > > + }
> > > > > > > +
> > > > > > > + if (g_strcmp0(id, self->id)) {
> > > > > > > + error_report("Invalid vmstate Id: %s != %s", id,
> > > > > > > self->id);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + size = qemu_get_be32(f);
> > > > > > > + if (size > DBUS_VMSTATE_SIZE_LIMIT) {
> > > > > > > + error_report("Invalid vmstate size: %u", size);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + data = g_malloc(size);
> > > > > > > + if (qemu_get_buffer(f, data, size) != size) {
> > > > > > > + error_report("Failed to read %u bytes", size);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + if (dbus_load_state_proxy(self->proxy, data, size) < 0) {
> > > > > > > + error_report("Failed to restore Id '%s'", id);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + ret = 0;
> > > > > > > +
> > > > > > > +end:
> > > > > > > + g_clear_pointer(&data, g_free);
> > > > > > > + return ret;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +dbus_save_state(QEMUFile *f, void *opaque)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(opaque);
> > > > > > > + GVariant *result = NULL, *child = NULL;
> > > > > > > + const uint8_t *data;
> > > > > > > + size_t size;
> > > > > > > + GError *err = NULL;
> > > > > > > +
> > > > > > > + result = g_dbus_proxy_call_sync(self->proxy, "Save",
> > > > > > > + NULL,
> > > > > > > G_DBUS_CALL_FLAGS_NO_AUTO_START,
> > > > > > > + -1, NULL, &err);
> > > > > > > + if (!result) {
> > > > > > > + error_report("Failed to Save: %s", err->message);
> > > > > > > + g_clear_error(&err);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + child = g_variant_get_child_value(result, 0);
> > > > > > > + data = g_variant_get_fixed_array(child, &size, sizeof(char));
> > > > > > > + if (!data) {
> > > > > > > + error_report("Failed to Save: not a byte array");
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > + if (size > DBUS_VMSTATE_SIZE_LIMIT) {
> > > > > > > + error_report("Too much vmstate data to save: %zu", size);
> > > > > > > + goto end;
> > > > > > > + }
> > > > > > > +
> > > > > > > + qemu_put_counted_string(f, self->id);
> > > > > > > + qemu_put_be32(f, size);
> > > > > > > + qemu_put_buffer(f, data, size);
> > > > > > > +
> > > > > > > +end:
> > > > > > > + g_clear_pointer(&child, g_variant_unref);
> > > > > > > + g_clear_pointer(&result, g_variant_unref);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static const SaveVMHandlers savevm_handlers = {
> > > > > > > + .save_state = dbus_save_state,
> > > > > > > + .load_state = dbus_load_state,
> > > > > > > +};
> > > > > > > +
> > > > > > > +static void
> > > > > > > +dbus_vmstate_complete(UserCreatable *uc, Error **errp)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(uc);
> > > > > > > + GError *err = NULL;
> > > > > > > + GDBusConnection *bus = NULL;
> > > > > > > + GDBusProxy *proxy = NULL;
> > > > > > > + char *idstr = NULL;
> > > > > > > +
> > > > > > > + if (!self->dbus_addr) {
> > > > > > > + error_setg(errp, QERR_MISSING_PARAMETER, "addr");
> > > > > > > + return;
> > > > > > > + }
> > > > > > > +
> > > > > > > + bus = g_dbus_connection_new_for_address_sync(self->dbus_addr,
> > > > > > > + G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
> > > > > > > + NULL, NULL, &err);
> > > > > > > + if (err) {
> > > > > > > + error_setg(errp, "failed to connect to DBus: '%s'",
> > > > > > > err->message);
> > > > > > > + g_clear_error(&err);
> > > > > > > + return;
> > > > > > > + }
> > > > > > > +
> > > > > > > + self->bus = bus;
> > > > > > > +
> > > > > > > + proxy = g_dbus_proxy_new_sync(bus,
> > > > > > > + G_DBUS_PROXY_FLAGS_NONE,
> > > > > > > + (GDBusInterfaceInfo *) &vmstate1_interface_info,
> > > > > > > + NULL,
> > > > > > > + "/org/qemu/VMState1",
> > > > > > > + "org.qemu.VMState1",
> > > > > > > + NULL, &err);
> > > > > > > +
> > > > > > > + if (err) {
> > > > > > > + error_setg(errp, "failed to create DBus proxy: '%s'",
> > > > > > > err->message);
> > > > > > > + g_clear_error(&err);
> > > > > > > + return;
> > > > > > > + }
> > > > > > > +
> > > > > > > + self->proxy = proxy;
> > > > > > > +
> > > > > > > + self->id = dbus_proxy_get_id(proxy, &err);
> > > > > > > + if (!self->id) {
> > > > > > > + error_setg(errp, "failed to get DBus Id: '%s'",
> > > > > > > err->message);
> > > > > > > + g_clear_error(&err);
> > > > > > > + return;
> > > > > > > + }
> > > > > > > +
> > > > > > > + idstr = get_idstr(self);
> > > > > > > + if (register_savevm_live(NULL, idstr, 0, 0,
> > > > > > > + &savevm_handlers, self) < 0) {
> > > > > > > + error_setg(errp, "Failed to register savevm handler");
> > > > > > > + }
> > > > > >
> > > > > > Can you try and avoid register_savevm_live if possible and just
> > > > > > wire a
> > > > > > vmsd onto the class like most other devices? We don't have many
> > > > > > register_savevm_live calls, and I'd like to get them down to just
> > > > > > the
> > > > > > iterative devices.
> > > > >
> > > > > Sure if I could, but it's not a device.
> > > > >
> > > > > Perhaps we could have a qom interface for vmsd users? I can try that
> > > > > eventually.
> > > >
> > > > Hmm, why isn't it a device?
> > >
> > > It doesn't need anything from Device (which is heavyweight), it is a
> > > simple user-creatable object that holds a dbus connection and reacts
> > > on migration events.
> > >
> > > If you take slirp helper process as an example, it's a "service" for a
> > > VM. Not a device. You could have the same helper for various devices
> > > etc, or more helpers for the same device.
> >
> > I think you're better calling this a device; the slirp world doesn't fit
> > nicely either and it would be better if it was a device as well.
> >
>
> The goal here is to migrate helper processes along with qemu.
>
> Helper processes may be things like slirp, network services, emulators
> (such as swtpm, which isn't a device either), or long-running
> jobs/process done on behalf of qemu, for example a AV compression,
> spice server...
So I think either fix qom to wire vmstate up, or just wear some special
glasses and see that they're really devices.
Dave
> > Dave
> >
> > > >
> > > >
> > > > Dave
> > > >
> > > > > thanks
> > > > >
> > > > > > Dave
> > > > > >
> > > > > >
> > > > > > > + g_free(idstr);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +dbus_vmstate_finalize(Object *o)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(o);
> > > > > > > + char *idstr = get_idstr(self);
> > > > > > > +
> > > > > > > + unregister_savevm(NULL, idstr, self);
> > > > > > > +
> > > > > > > + g_clear_object(&self->bus);
> > > > > > > + g_clear_object(&self->proxy);
> > > > > > > + g_free(self->dbus_addr);
> > > > > > > + g_free(self->id);
> > > > > > > + g_free(idstr);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static char *
> > > > > > > +get_dbus_addr(Object *o, Error **errp)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(o);
> > > > > > > +
> > > > > > > + return g_strdup(self->dbus_addr);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +set_dbus_addr(Object *o, const char *str, Error **errp)
> > > > > > > +{
> > > > > > > + DBusVMState *self = DBUS_VMSTATE(o);
> > > > > > > +
> > > > > > > + g_free(self->dbus_addr);
> > > > > > > + self->dbus_addr = g_strdup(str);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +dbus_vmstate_class_init(ObjectClass *oc, void *data)
> > > > > > > +{
> > > > > > > + UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
> > > > > > > +
> > > > > > > + ucc->complete = dbus_vmstate_complete;
> > > > > > > +
> > > > > > > + object_class_property_add_str(oc, "addr",
> > > > > > > + get_dbus_addr, set_dbus_addr,
> > > > > > > + &error_abort);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static const TypeInfo dbus_vmstate_info = {
> > > > > > > + .name = TYPE_DBUS_VMSTATE,
> > > > > > > + .parent = TYPE_OBJECT,
> > > > > > > + .instance_size = sizeof(DBusVMState),
> > > > > > > + .instance_finalize = dbus_vmstate_finalize,
> > > > > > > + .class_size = sizeof(DBusVMStateClass),
> > > > > > > + .class_init = dbus_vmstate_class_init,
> > > > > > > + .interfaces = (InterfaceInfo[]) {
> > > > > > > + { TYPE_USER_CREATABLE },
> > > > > > > + { }
> > > > > > > + }
> > > > > > > +};
> > > > > > > +
> > > > > > > +static void
> > > > > > > +register_types(void)
> > > > > > > +{
> > > > > > > + type_register_static(&dbus_vmstate_info);
> > > > > > > +}
> > > > > > > +
> > > > > > > +type_init(register_types);
> > > > > > > diff --git a/configure b/configure
> > > > > > > index 714e7fb6a1..e5b34f5ca7 100755
> > > > > > > --- a/configure
> > > > > > > +++ b/configure
> > > > > > > @@ -3665,10 +3665,16 @@ if $pkg_config
> > > > > > > --atleast-version=$glib_req_ver gio-2.0; then
> > > > > > > gio=yes
> > > > > > > gio_cflags=$($pkg_config --cflags gio-2.0)
> > > > > > > gio_libs=$($pkg_config --libs gio-2.0)
> > > > > > > + gdbus_codegen=$($pkg_config --variable=gdbus_codegen gio-2.0)
> > > > > > > else
> > > > > > > gio=no
> > > > > > > fi
> > > > > > >
> > > > > > > +if $pkg_config --atleast-version=$glib_req_ver gio-unix-2.0; then
> > > > > > > + gio_cflags="$gio_cflags $($pkg_config --cflags gio-unix-2.0)"
> > > > > > > + gio_libs="$gio_libs $($pkg_config --libs gio-unix-2.0)"
> > > > > > > +fi
> > > > > > > +
> > > > > > > # Sanity check that the current size_t matches the
> > > > > > > # size that glib thinks it should be. This catches
> > > > > > > # problems on multi-arch where people try to build
> > > > > > > @@ -6830,6 +6836,7 @@ if test "$gio" = "yes" ; then
> > > > > > > echo "CONFIG_GIO=y" >> $config_host_mak
> > > > > > > echo "GIO_CFLAGS=$gio_cflags" >> $config_host_mak
> > > > > > > echo "GIO_LIBS=$gio_libs" >> $config_host_mak
> > > > > > > + echo "GDBUS_CODEGEN=$gdbus_codegen" >> $config_host_mak
> > > > > > > fi
> > > > > > > echo "CONFIG_TLS_PRIORITY=\"$tls_priority\"" >> $config_host_mak
> > > > > > > if test "$gnutls" = "yes" ; then
> > > > > > > diff --git a/docs/interop/dbus-vmstate.rst
> > > > > > > b/docs/interop/dbus-vmstate.rst
> > > > > > > new file mode 100644
> > > > > > > index 0000000000..4a32a183fb
> > > > > > > --- /dev/null
> > > > > > > +++ b/docs/interop/dbus-vmstate.rst
> > > > > > > @@ -0,0 +1,63 @@
> > > > > > > +============
> > > > > > > +DBus VMState
> > > > > > > +============
> > > > > > > +
> > > > > > > +Introduction
> > > > > > > +============
> > > > > > > +
> > > > > > > +Helper processes may have their state migrated with the help of
> > > > > > > +QEMU "dbus-vmstate" objects.
> > > > > > > +
> > > > > > > +At this point, the connection to the helper is done in DBus
> > > > > > > +peer-to-peer mode (no initial Hello, and no bus name for
> > > > > > > +communication). The helper must be listening to the given
> > > > > > > address.
> > > > > > > +
> > > > > > > +Helper may save arbitrary data to be transferred in the migration
> > > > > > > +stream and restored/loaded on destination.
> > > > > > > +
> > > > > > > +The data amount to be transferred is limited to 1Mb. The state
> > > > > > > must be
> > > > > > > +saved quickly (a few seconds maximum). (DBus imposes a time
> > > > > > > limit on
> > > > > > > +reply anyway, and migration would fail if the data isn't given
> > > > > > > quickly
> > > > > > > +enough)
> > > > > > > +
> > > > > > > +Interface
> > > > > > > +=========
> > > > > > > +
> > > > > > > +On /org/qemu/VMState1 object path:
> > > > > > > +
> > > > > > > +.. code:: xml
> > > > > > > +
> > > > > > > + <interface name="org.qemu.VMState1">
> > > > > > > + <property name="Id" type="s" access="read"/>
> > > > > > > + <method name="Load">
> > > > > > > + <arg type="ay" name="data" direction="in"/>
> > > > > > > + </method>
> > > > > > > + <method name="Save">
> > > > > > > + <arg type="ay" name="data" direction="out"/>
> > > > > > > + </method>
> > > > > > > + </interface>
> > > > > > > +
> > > > > > > +"Id" property
> > > > > > > +-------------
> > > > > > > +
> > > > > > > +A utf8 encoded string that identifies the helper uniquely.
> > > > > > > +Must be <256 bytes.
> > > > > > > +
> > > > > > > +Load(in u8[] bytes) method
> > > > > > > +--------------------------
> > > > > > > +
> > > > > > > +The method called on destination with the state to restore.
> > > > > > > +
> > > > > > > +The helper may be initially started in a waiting state (with
> > > > > > > +an --incoming argument for example), and it may resume on load
> > > > > > > +success.
> > > > > > > +
> > > > > > > +An error may be returned to the caller.
> > > > > > > +
> > > > > > > +Save(out u8[] bytes) method
> > > > > > > +---------------------------
> > > > > > > +
> > > > > > > +The method called on the source to get the current state to be
> > > > > > > +migrated. The helper should continue to run normally.
> > > > > > > +
> > > > > > > +An error may be returned to the caller.
> > > > > > > diff --git a/docs/interop/index.rst b/docs/interop/index.rst
> > > > > > > index b4bfcab417..6bb173cfa6 100644
> > > > > > > --- a/docs/interop/index.rst
> > > > > > > +++ b/docs/interop/index.rst
> > > > > > > @@ -13,6 +13,7 @@ Contents:
> > > > > > > :maxdepth: 2
> > > > > > >
> > > > > > > bitmaps
> > > > > > > + dbus-vmstate
> > > > > > > live-block-operations
> > > > > > > pr-helper
> > > > > > > vhost-user
> > > > > > > diff --git a/tests/Makefile.include b/tests/Makefile.include
> > > > > > > index fd7fdb8658..2c610086a7 100644
> > > > > > > --- a/tests/Makefile.include
> > > > > > > +++ b/tests/Makefile.include
> > > > > > > @@ -157,7 +157,9 @@ check-qtest-pci-$(CONFIG_RTL8139_PCI) +=
> > > > > > > tests/rtl8139-test$(EXESUF)
> > > > > > > check-qtest-pci-$(CONFIG_VGA) += tests/display-vga-test$(EXESUF)
> > > > > > > check-qtest-pci-$(CONFIG_HDA) += tests/intel-hda-test$(EXESUF)
> > > > > > > check-qtest-pci-$(CONFIG_IVSHMEM_DEVICE) +=
> > > > > > > tests/ivshmem-test$(EXESUF)
> > > > > > > -
> > > > > > > +ifneq ($(GDBUS_CODEGEN),)
> > > > > > > +check-qtest-pci-$(CONFIG_GIO) += tests/dbus-vmstate-test$(EXESUF)
> > > > > > > +endif
> > > > > > > check-qtest-i386-$(CONFIG_ISA_TESTDEV) =
> > > > > > > tests/endianness-test$(EXESUF)
> > > > > > > check-qtest-i386-y += tests/fdc-test$(EXESUF)
> > > > > > > check-qtest-i386-y += tests/ide-test$(EXESUF)
> > > > > > > @@ -618,6 +620,18 @@ tests/qapi-schema/doc-good.test.texi:
> > > > > > > $(SRC_PATH)/tests/qapi-schema/doc-good.jso
> > > > > > > @mv tests/qapi-schema/doc-good-qapi-doc.texi $@
> > > > > > > @rm -f tests/qapi-schema/doc-good-qapi-*.[ch]
> > > > > > > tests/qapi-schema/doc-good-qmp-*.[ch]
> > > > > > >
> > > > > > > +tests/dbus-vmstate1.h tests/dbus-vmstate1.c:
> > > > > > > tests/dbus-vmstate1-gen-timestamp ;
> > > > > > > +tests/dbus-vmstate1-gen-timestamp:
> > > > > > > $(SRC_PATH)/tests/dbus-vmstate1.xml
> > > > > > > + $(call quiet-command,$(GDBUS_CODEGEN) $< \
> > > > > > > + --interface-prefix org.qemu --generate-c-code
> > > > > > > tests/dbus-vmstate1, \
> > > > > > > + "GEN","$(@:%-timestamp=%)")
> > > > > > > + @>$@
> > > > > > > +
> > > > > > > +tests/dbus-vmstate1.o-cflags := $(GIO_CFLAGS)
> > > > > > > +tests/dbus-vmstate1.o-libs := $(GIO_LIBS)
> > > > > > > +
> > > > > > > +tests/dbus-vmstate-test.o: tests/dbus-vmstate1.h
> > > > > > > +
> > > > > > > tests/test-string-output-visitor$(EXESUF):
> > > > > > > tests/test-string-output-visitor.o $(test-qapi-obj-y)
> > > > > > > tests/test-string-input-visitor$(EXESUF):
> > > > > > > tests/test-string-input-visitor.o $(test-qapi-obj-y)
> > > > > > > tests/test-qmp-event$(EXESUF): tests/test-qmp-event.o
> > > > > > > $(test-qapi-obj-y) tests/test-qapi-events.o
> > > > > > > @@ -820,6 +834,7 @@ tests/test-filter-mirror$(EXESUF):
> > > > > > > tests/test-filter-mirror.o $(qtest-obj-y)
> > > > > > > tests/test-filter-redirector$(EXESUF):
> > > > > > > tests/test-filter-redirector.o $(qtest-obj-y)
> > > > > > > tests/test-x86-cpuid-compat$(EXESUF):
> > > > > > > tests/test-x86-cpuid-compat.o $(qtest-obj-y)
> > > > > > > tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o
> > > > > > > contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
> > > > > > > $(libqos-spapr-obj-y)
> > > > > > > +tests/dbus-vmstate-test$(EXESUF): tests/dbus-vmstate-test.o
> > > > > > > tests/dbus-vmstate1.o $(libqos-pc-obj-y) $(libqos-spapr-obj-y)
> > > > > > > tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o
> > > > > > > $(test-util-obj-y) libvhost-user.a
> > > > > > > tests/test-uuid$(EXESUF): tests/test-uuid.o $(test-util-obj-y)
> > > > > > > tests/test-arm-mptimer$(EXESUF): tests/test-arm-mptimer.o
> > > > > > > @@ -1172,6 +1187,7 @@ check-clean:
> > > > > > > rm -rf $(check-unit-y) tests/*.o $(QEMU_IOTESTS_HELPERS-y)
> > > > > > > rm -rf $(sort $(foreach target,$(SYSEMU_TARGET_LIST),
> > > > > > > $(check-qtest-$(target)-y)) $(check-qtest-generic-y))
> > > > > > > rm -f tests/test-qapi-gen-timestamp
> > > > > > > + rm -f tests/dbus-vmstate1-gen-timestamp
> > > > > > > rm -rf $(TESTS_VENV_DIR) $(TESTS_RESULTS_DIR)
> > > > > > >
> > > > > > > clean: check-clean
> > > > > > > diff --git a/tests/dbus-vmstate-test.c b/tests/dbus-vmstate-test.c
> > > > > > > new file mode 100644
> > > > > > > index 0000000000..45d44916d2
> > > > > > > --- /dev/null
> > > > > > > +++ b/tests/dbus-vmstate-test.c
> > > > > > > @@ -0,0 +1,371 @@
> > > > > > > +#include "qemu/osdep.h"
> > > > > > > +#include <glib/gstdio.h>
> > > > > > > +#include <gio/gio.h>
> > > > > > > +#include "libqtest.h"
> > > > > > > +#include "qemu-common.h"
> > > > > > > +#include "dbus-vmstate1.h"
> > > > > > > +
> > > > > > > +static char *workdir;
> > > > > > > +
> > > > > > > +typedef struct TestServerId {
> > > > > > > + const char *name;
> > > > > > > + const char *data;
> > > > > > > + size_t size;
> > > > > > > +} TestServerId;
> > > > > > > +
> > > > > > > +static const TestServerId idA = {
> > > > > > > + "idA", "I'am\0idA!", sizeof("I'am\0idA!")
> > > > > > > +};
> > > > > > > +
> > > > > > > +static const TestServerId idB = {
> > > > > > > + "idB", "I'am\0idB!", sizeof("I'am\0idB!")
> > > > > > > +};
> > > > > > > +
> > > > > > > +typedef struct TestServer {
> > > > > > > + const TestServerId *id;
> > > > > > > + bool save_called;
> > > > > > > + bool load_called;
> > > > > > > + GDBusObjectManagerServer *om;
> > > > > > > + GDBusServer *server;
> > > > > > > +} TestServer;
> > > > > > > +
> > > > > > > +typedef struct Test {
> > > > > > > + bool migrate_fail;
> > > > > > > + TestServer srcA;
> > > > > > > + TestServer dstA;
> > > > > > > + TestServer srcB;
> > > > > > > + TestServer dstB;
> > > > > > > + GMainLoop *loop, *dbus_loop;
> > > > > > > + QTestState *src_qemu;
> > > > > > > +} Test;
> > > > > > > +
> > > > > > > +GMutex mutex;
> > > > > > > +GCond cond;
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +vmstate_load(VMState1 *object, GDBusMethodInvocation *invocation,
> > > > > > > + const gchar *arg_data, gpointer user_data)
> > > > > > > +{
> > > > > > > + TestServer *h = user_data;
> > > > > > > + GVariant *args, *var;
> > > > > > > + const uint8_t *data;
> > > > > > > + size_t size;
> > > > > > > +
> > > > > > > + args = g_dbus_method_invocation_get_parameters(invocation);
> > > > > > > + var = g_variant_get_child_value(args, 0);
> > > > > > > + data = g_variant_get_fixed_array(var, &size, sizeof(char));
> > > > > > > + g_assert_cmpuint(size, ==, h->id->size);
> > > > > > > + g_assert(!memcmp(data, h->id->data, h->id->size));
> > > > > > > + h->load_called = true;
> > > > > > > + g_variant_unref(var);
> > > > > > > +
> > > > > > > + g_dbus_method_invocation_return_value(invocation,
> > > > > > > g_variant_new("()"));
> > > > > > > + return TRUE;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +vmstate_save(VMState1 *object, GDBusMethodInvocation *invocation,
> > > > > > > + gpointer user_data)
> > > > > > > +{
> > > > > > > + TestServer *h = user_data;
> > > > > > > + GVariant *var;
> > > > > > > +
> > > > > > > + var = g_variant_new_fixed_array(G_VARIANT_TYPE_BYTE,
> > > > > > > + h->id->data, h->id->size,
> > > > > > > sizeof(char));
> > > > > > > + g_dbus_method_invocation_return_value(invocation,
> > > > > > > + g_variant_new("(@ay)",
> > > > > > > var));
> > > > > > > + h->save_called = true;
> > > > > > > +
> > > > > > > + return TRUE;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +connection_closed(GDBusConnection *connection,
> > > > > > > + gboolean remote_peer_vanished,
> > > > > > > + GError *Error,
> > > > > > > + gpointer user_data)
> > > > > > > +{
> > > > > > > + TestServer *h = user_data;
> > > > > > > +
> > > > > > > + g_clear_object(&h->om);
> > > > > > > + g_clear_object(&connection);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static GDBusObjectManagerServer *
> > > > > > > +get_omserver(GDBusConnection *conn, gpointer user_data)
> > > > > > > +{
> > > > > > > + TestServer *h = user_data;
> > > > > > > + GDBusObjectManagerServer *om;
> > > > > > > + GDBusObjectSkeleton *sk;
> > > > > > > + VMState1 *v;
> > > > > > > +
> > > > > > > + om = g_dbus_object_manager_server_new("/org/qemu");
> > > > > > > + sk = g_dbus_object_skeleton_new("/org/qemu/VMState1");
> > > > > > > +
> > > > > > > + v = vmstate1_skeleton_new();
> > > > > > > + g_object_set(v, "id", h->id->name, NULL);
> > > > > > > + g_signal_connect(v, "handle-load", G_CALLBACK(vmstate_load),
> > > > > > > user_data);
> > > > > > > + g_signal_connect(v, "handle-save", G_CALLBACK(vmstate_save),
> > > > > > > user_data);
> > > > > > > +
> > > > > > > + g_dbus_object_skeleton_add_interface(sk,
> > > > > > > G_DBUS_INTERFACE_SKELETON(v));
> > > > > > > + g_dbus_object_manager_server_export(om, sk);
> > > > > > > + g_dbus_object_manager_server_set_connection(om, conn);
> > > > > > > +
> > > > > > > + g_clear_object(&v);
> > > > > > > + g_clear_object(&sk);
> > > > > > > +
> > > > > > > + return om;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +on_new_connection(GDBusServer *server,
> > > > > > > + GDBusConnection *connection,
> > > > > > > + gpointer user_data)
> > > > > > > +{
> > > > > > > + TestServer *h = user_data;
> > > > > > > +
> > > > > > > + g_object_ref(connection);
> > > > > > > + g_signal_connect(connection, "closed",
> > > > > > > + G_CALLBACK(connection_closed), user_data);
> > > > > > > + h->om = get_omserver(connection, user_data);
> > > > > > > +
> > > > > > > + return TRUE;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +allow_mechanism_cb(GDBusAuthObserver *observer,
> > > > > > > + const gchar *mechanism,
> > > > > > > + gpointer user_data)
> > > > > > > +{
> > > > > > > + return g_strcmp0(mechanism, "EXTERNAL") == 0;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +authorize_authenticated_peer_cb(GDBusAuthObserver *observer,
> > > > > > > + GIOStream *stream,
> > > > > > > + GCredentials *credentials,
> > > > > > > + gpointer user_data)
> > > > > > > +{
> > > > > > > + gboolean authorized = FALSE;
> > > > > > > +
> > > > > > > + if (credentials != NULL) {
> > > > > > > + GCredentials *own_credentials = g_credentials_new();
> > > > > > > +
> > > > > > > + if (g_credentials_is_same_user(credentials,
> > > > > > > own_credentials, NULL)) {
> > > > > > > + authorized = TRUE;
> > > > > > > + }
> > > > > > > +
> > > > > > > + g_clear_object(&own_credentials);
> > > > > > > + }
> > > > > > > +
> > > > > > > + return authorized;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static GDBusServer *
> > > > > > > +server_start(TestServer *h, const char *p, const TestServerId
> > > > > > > *id)
> > > > > > > +{
> > > > > > > + GDBusAuthObserver *observer = NULL;
> > > > > > > + GDBusServer *server = NULL;
> > > > > > > + gchar *guid = NULL;
> > > > > > > + GError *error = NULL;
> > > > > > > + char *addr = NULL;
> > > > > > > +
> > > > > > > + h->id = id;
> > > > > > > + addr = g_strdup_printf("unix:path=%s/dbus-%s%s", workdir, p,
> > > > > > > h->id->name);
> > > > > > > + guid = g_dbus_generate_guid();
> > > > > > > + observer = g_dbus_auth_observer_new();
> > > > > > > + g_signal_connect(observer, "allow-mechanism",
> > > > > > > + G_CALLBACK(allow_mechanism_cb), h);
> > > > > > > + g_signal_connect(observer, "authorize-authenticated-peer",
> > > > > > > +
> > > > > > > G_CALLBACK(authorize_authenticated_peer_cb), h);
> > > > > > > +
> > > > > > > + server = g_dbus_server_new_sync(addr,
> > > > > > > + G_DBUS_SERVER_FLAGS_NONE,
> > > > > > > + guid,
> > > > > > > + observer,
> > > > > > > + NULL, /* GCancellable */
> > > > > > > + &error);
> > > > > > > + g_dbus_server_start(server);
> > > > > > > + g_clear_object(&observer);
> > > > > > > + g_free(guid);
> > > > > > > +
> > > > > > > + if (server == NULL) {
> > > > > > > + g_printerr("Error creating server at address %s: %s\n",
> > > > > > > + addr, error->message);
> > > > > > > + g_error_free(error);
> > > > > > > + return NULL;
> > > > > > > + }
> > > > > > > +
> > > > > > > + g_signal_connect(server, "new-connection",
> > > > > > > + G_CALLBACK(on_new_connection), h);
> > > > > > > +
> > > > > > > + g_free(addr);
> > > > > > > + return server;
> > > > > > > +}
> > > > > > > +
> > > > > > > +
> > > > > > > +static gpointer
> > > > > > > +dbus_thread(gpointer p)
> > > > > > > +{
> > > > > > > + Test *test = p;
> > > > > > > + GMainContext *context = g_main_context_new();
> > > > > > > + GMainLoop *loop = g_main_loop_new(context, FALSE);
> > > > > > > +
> > > > > > > + g_main_context_push_thread_default(context);
> > > > > > > +
> > > > > > > + g_mutex_lock(&mutex);
> > > > > > > + test->srcA.server = server_start(&test->srcA, "src", &idA);
> > > > > > > + test->srcB.server = server_start(&test->srcB, "src", &idB);
> > > > > > > + test->dstA.server = server_start(&test->dstA, "dst", &idA);
> > > > > > > + test->dstB.server = server_start(&test->dstB, "dst", &idB);
> > > > > > > + test->dbus_loop = loop;
> > > > > > > + g_cond_signal(&cond);
> > > > > > > + g_mutex_unlock(&mutex);
> > > > > > > +
> > > > > > > + g_main_loop_run(loop);
> > > > > > > +
> > > > > > > + g_main_loop_unref(loop);
> > > > > > > + g_main_context_unref(context);
> > > > > > > +
> > > > > > > + g_mutex_lock(&mutex);
> > > > > > > + g_clear_object(&test->srcA.server);
> > > > > > > + g_clear_object(&test->srcB.server);
> > > > > > > + g_clear_object(&test->dstA.server);
> > > > > > > + g_clear_object(&test->dstB.server);
> > > > > > > + g_mutex_unlock(&mutex);
> > > > > > > +
> > > > > > > + return NULL;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static gboolean
> > > > > > > +wait_for_migration_complete(gpointer user_data)
> > > > > > > +{
> > > > > > > + Test *test = user_data;
> > > > > > > + QDict *rsp_return;
> > > > > > > + bool stop = false;
> > > > > > > + const char *status;
> > > > > > > +
> > > > > > > + qtest_qmp_send(test->src_qemu, "{ 'execute': 'query-migrate'
> > > > > > > }");
> > > > > > > + rsp_return = qtest_qmp_receive_success(test->src_qemu, NULL,
> > > > > > > NULL);
> > > > > > > + status = qdict_get_str(rsp_return, "status");
> > > > > > > + if (g_str_equal(status, "completed") || g_str_equal(status,
> > > > > > > "failed")) {
> > > > > > > + stop = true;
> > > > > > > + g_assert_cmpstr(status, ==,
> > > > > > > + test->migrate_fail ? "failed" :
> > > > > > > "completed");
> > > > > > > + }
> > > > > > > + qobject_unref(rsp_return);
> > > > > > > +
> > > > > > > + if (stop) {
> > > > > > > + g_main_loop_quit(test->loop);
> > > > > > > + }
> > > > > > > + return stop ? G_SOURCE_REMOVE : G_SOURCE_CONTINUE;
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void migrate(QTestState *who, const char *uri)
> > > > > > > +{
> > > > > > > + QDict *args, *rsp;
> > > > > > > +
> > > > > > > + args = qdict_new();
> > > > > > > + qdict_put_str(args, "uri", uri);
> > > > > > > +
> > > > > > > + rsp = qtest_qmp(who, "{ 'execute': 'migrate', 'arguments':
> > > > > > > %p }", args);
> > > > > > > +
> > > > > > > + g_assert(qdict_haskey(rsp, "return"));
> > > > > > > + qobject_unref(rsp);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +test_dbus_vmstate(Test *test)
> > > > > > > +{
> > > > > > > + QTestState *src_qemu = NULL, *dst_qemu = NULL;
> > > > > > > + char *src_qemu_args = NULL, *dst_qemu_args = NULL;
> > > > > > > + char *uri = g_strdup_printf("unix:%s/migsocket", workdir);
> > > > > > > + GThread *t = g_thread_new("dbus", dbus_thread, test);
> > > > > > > +
> > > > > > > + g_mutex_lock(&mutex);
> > > > > > > + while (!test->dbus_loop) {
> > > > > > > + g_cond_wait(&cond, &mutex);
> > > > > > > + }
> > > > > > > +
> > > > > > > + src_qemu_args =
> > > > > > > + g_strdup_printf("-object dbus-vmstate,id=dvA,addr=%s "
> > > > > > > + "-object dbus-vmstate,id=dvB,addr=%s",
> > > > > > > +
> > > > > > > g_dbus_server_get_client_address(test->srcA.server),
> > > > > > > +
> > > > > > > g_dbus_server_get_client_address(test->srcB.server));
> > > > > > > +
> > > > > > > +
> > > > > > > + dst_qemu_args =
> > > > > > > + g_strdup_printf("-object dbus-vmstate,id=dvA,addr=%s "
> > > > > > > + "-object dbus-vmstate,id=dvB,addr=%s "
> > > > > > > + "-incoming %s",
> > > > > > > +
> > > > > > > g_dbus_server_get_client_address(test->dstA.server),
> > > > > > > +
> > > > > > > g_dbus_server_get_client_address(test->dstB.server),
> > > > > > > + uri);
> > > > > > > +
> > > > > > > + src_qemu = qtest_init(src_qemu_args);
> > > > > > > + dst_qemu = qtest_init(dst_qemu_args);
> > > > > > > +
> > > > > > > + test->loop = g_main_loop_new(NULL, TRUE);
> > > > > > > +
> > > > > > > + migrate(src_qemu, uri);
> > > > > > > + test->src_qemu = src_qemu;
> > > > > > > + g_timeout_add_seconds(1, wait_for_migration_complete, test);
> > > > > > > +
> > > > > > > + g_main_loop_run(test->loop);
> > > > > > > + g_main_loop_unref(test->loop);
> > > > > > > +
> > > > > > > + g_free(uri);
> > > > > > > + qtest_quit(dst_qemu);
> > > > > > > + qtest_quit(src_qemu);
> > > > > > > + g_free(dst_qemu_args);
> > > > > > > + g_free(src_qemu_args);
> > > > > > > +
> > > > > > > + g_main_loop_quit(test->dbus_loop);
> > > > > > > + g_mutex_unlock(&mutex);
> > > > > > > +
> > > > > > > + g_thread_join(t);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +check_migrated(TestServer *s, TestServer *d)
> > > > > > > +{
> > > > > > > + assert(s->save_called);
> > > > > > > + assert(!s->load_called);
> > > > > > > + assert(!d->save_called);
> > > > > > > + assert(d->load_called);
> > > > > > > +}
> > > > > > > +
> > > > > > > +static void
> > > > > > > +test_dbus_vmstate_migrate(void)
> > > > > > > +{
> > > > > > > + Test test = { };
> > > > > > > +
> > > > > > > + test_dbus_vmstate(&test);
> > > > > > > +
> > > > > > > + check_migrated(&test.srcA, &test.dstA);
> > > > > > > + check_migrated(&test.srcB, &test.dstB);
> > > > > > > +}
> > > > > > > +
> > > > > > > +int
> > > > > > > +main(int argc, char **argv)
> > > > > > > +{
> > > > > > > + GError *err = NULL;
> > > > > > > + int ret;
> > > > > > > +
> > > > > > > + g_test_init(&argc, &argv, NULL);
> > > > > > > +
> > > > > > > + workdir = g_dir_make_tmp("dbus-vmstate-test-XXXXXX", &err);
> > > > > > > + if (!workdir) {
> > > > > > > + g_error("Unable to create temporary dir: %s\n",
> > > > > > > err->message);
> > > > > > > + }
> > > > > > > +
> > > > > > > + qtest_add_func("/dbus-vmstate/migrate",
> > > > > > > + test_dbus_vmstate_migrate);
> > > > > > > +
> > > > > > > + ret = g_test_run();
> > > > > > > +
> > > > > > > + rmdir(workdir);
> > > > > > > + g_free(workdir);
> > > > > > > +
> > > > > > > + return ret;
> > > > > > > +}
> > > > > > > diff --git a/tests/dbus-vmstate1.xml b/tests/dbus-vmstate1.xml
> > > > > > > new file mode 100644
> > > > > > > index 0000000000..cc8563be4c
> > > > > > > --- /dev/null
> > > > > > > +++ b/tests/dbus-vmstate1.xml
> > > > > > > @@ -0,0 +1,12 @@
> > > > > > > +<?xml version="1.0"?>
> > > > > > > +<node name="/"
> > > > > > > xmlns:doc="http://www.freedesktop.org/dbus/1.0/doc.dtd";>
> > > > > > > + <interface name="org.qemu.VMState1">
> > > > > > > + <property name="Id" type="s" access="read"/>
> > > > > > > + <method name="Load">
> > > > > > > + <arg type="ay" name="data" direction="in"/>
> > > > > > > + </method>
> > > > > > > + <method name="Save">
> > > > > > > + <arg type="ay" name="data" direction="out"/>
> > > > > > > + </method>
> > > > > > > + </interface>
> > > > > > > +</node>
> > > > > > > --
> > > > > > > 2.23.0.rc1
> > > > > > >
> > > > > > --
> > > > > > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
> > > > --
> > > > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
> > --
> > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
> >
>
>
> --
> Marc-André Lureau
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
