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author | Greg Kurz <gkurz@linux.vnet.ibm.com> | 2016-02-18 12:32:25 +0100 |
---|---|---|
committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-11-29 19:46:50 -0600 |
commit | ca21c6a465ffc10d7d281d8d78dff5740e02620b (patch) | |
tree | e420e020a7f86fa591b2c517b627348a5dd96a8d | |
parent | 1d572f0546809ef7c86e231f0f72cfdbabd0e05c (diff) | |
download | hqemu-ca21c6a465ffc10d7d281d8d78dff5740e02620b.zip hqemu-ca21c6a465ffc10d7d281d8d78dff5740e02620b.tar.gz |
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>
-rw-r--r-- | hw/core/machine.c | 21 | ||||
-rw-r--r-- | include/hw/boards.h | 1 | ||||
-rw-r--r-- | migration/savevm.c | 10 | ||||
-rw-r--r-- | qemu-options.hx | 3 |
4 files changed, 32 insertions, 3 deletions
diff --git a/hw/core/machine.c b/hw/core/machine.c index 6d1a0d8..a8c4680 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -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; diff --git a/include/hw/boards.h b/include/hw/boards.h index de3b3bd..b5d7eae 100644 --- a/include/hw/boards.h +++ b/include/hw/boards.h @@ -127,6 +127,7 @@ struct MachineState { char *firmware; bool iommu; bool suppress_vmdesc; + bool enforce_config_section; ram_addr_t ram_size; ram_addr_t maxram_size; diff --git a/migration/savevm.c b/migration/savevm.c index b459156..96e7db5 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -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; diff --git a/qemu-options.hx b/qemu-options.hx index 599db94..144e6a9 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -43,7 +43,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \ " 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" - " nvdimm=on|off controls NVDIMM support (default=off)\n", + " nvdimm=on|off controls NVDIMM support (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}[,...]] |