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migration: allow machine to enforce configuration section migration

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Migration of pseries-2.3 doesn't have configuration section. Unfortunately,
QEMU 2.4/2.4.1/2.5 are buggy and always stream and expect the configuration
section, and break migration both ways.

This patch introduces a property which allows to enforce a configuration
section for machines who don't have one.

It can be set at startup:

-machine enforce-config-section=on

or later from the QEMU monitor:

qom-set /machine enforce-config-section on

It is up to the tooling to set or unset this property according to the
version of the QEMU at the other end of the pipe.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2016-02-18 12:32:25 +01:00 • committed by David Gibson
parent 09b5e30da5
commit 902c053d83
4 changed files with 32 additions and 3 deletions
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21
hw/core/machine.c
View file

@ -312,6 +312,21 @@ static bool machine_get_suppress_vmdesc(Object *obj, Error **errp)
return ms->suppress_vmdesc;
}
static void machine_set_enforce_config_section(Object *obj, bool value,
Error **errp)
{
MachineState *ms = MACHINE(obj);
ms->enforce_config_section = value;
}
static bool machine_get_enforce_config_section(Object *obj, Error **errp)
{
MachineState *ms = MACHINE(obj);
return ms->enforce_config_section;
}
static int error_on_sysbus_device(SysBusDevice *sbdev, void *opaque)
{
error_report("Option '-device %s' cannot be handled by this machine",
@ -467,6 +482,12 @@ static void machine_initfn(Object *obj)
object_property_set_description(obj, "suppress-vmdesc",
"Set on to disable self-describing migration",
NULL);
object_property_add_bool(obj, "enforce-config-section",
machine_get_enforce_config_section,
machine_set_enforce_config_section, NULL);
object_property_set_description(obj, "enforce-config-section",
"Set on to enforce configuration section migration",
NULL);
/* Register notifier when init is done for sysbus sanity checks */
ms->sysbus_notifier.notify = machine_init_notify;