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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
Download patch file Download diff file Expand all files Collapse all files

10
migration/savevm.c
View file

@ -878,13 +878,19 @@ bool qemu_savevm_state_blocked(Error **errp)
return false;
}
static bool enforce_config_section(void)
{
MachineState *machine = MACHINE(qdev_get_machine());
return machine->enforce_config_section;
}
void qemu_savevm_state_header(QEMUFile *f)
{
trace_savevm_state_header();
qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
qemu_put_be32(f, QEMU_VM_FILE_VERSION);
if (!savevm_state.skip_configuration) {
if (!savevm_state.skip_configuration || enforce_config_section()) {
qemu_put_byte(f, QEMU_VM_CONFIGURATION);
vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0);
}
@ -1883,7 +1889,7 @@ int qemu_loadvm_state(QEMUFile *f)
return -ENOTSUP;
}
if (!savevm_state.skip_configuration) {
if (!savevm_state.skip_configuration || enforce_config_section()) {
if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) {
error_report("Configuration section missing");
return -EINVAL;