migration: allow machine to enforce configuration section migration

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>
(cherry picked from commit 902c053d834e3b802ec736f170edf226d4a841ff)

Conflicts:
	qemu-options.hx

* removed context dependency on 87252e1b
* added to provide 2.5<->2.5.1 migration compat option for
  pseries-2.3 machines

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/qemu-options.hx b/qemu-options.hx
index 0eea4ee..85a6cb8 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -41,7 +41,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
     "                igd-passthru=on|off controls IGD GFX passthrough support (default=off)\n"
     "                aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n"
     "                dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n"
-    "                suppress-vmdesc=on|off disables self-describing migration (default=off)\n",
+    "                suppress-vmdesc=on|off disables self-describing migration (default=off)\n"
+    "                enforce-config-section=on|off enforce configuration section migration (default=off)\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -machine [type=]@var{name}[,prop=@var{value}[,...]]