migration: Allow to suppress vmdesc submission
We now always send a JSON blob describing the migration file format as part of the migration stream. However, some tools built around QEMU have proven to stumble over this. This patch gives the user the chance to disable said self-describing part of the migration stream. To disable vmdesc submission, just add -machine suppress-vmdesc=on to your QEMU command line. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -254,6 +254,20 @@ static void machine_set_iommu(Object *obj, bool value, Error **errp)
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ms->iommu = value;
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ms->iommu = value;
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}
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}
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static void machine_set_suppress_vmdesc(Object *obj, bool value, Error **errp)
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{
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MachineState *ms = MACHINE(obj);
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ms->suppress_vmdesc = value;
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}
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static bool machine_get_suppress_vmdesc(Object *obj, Error **errp)
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{
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MachineState *ms = MACHINE(obj);
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return ms->suppress_vmdesc;
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}
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static int error_on_sysbus_device(SysBusDevice *sbdev, void *opaque)
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static int error_on_sysbus_device(SysBusDevice *sbdev, void *opaque)
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{
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{
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error_report("Option '-device %s' cannot be handled by this machine",
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error_report("Option '-device %s' cannot be handled by this machine",
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@ -377,6 +391,12 @@ static void machine_initfn(Object *obj)
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object_property_set_description(obj, "iommu",
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object_property_set_description(obj, "iommu",
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"Set on/off to enable/disable Intel IOMMU (VT-d)",
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"Set on/off to enable/disable Intel IOMMU (VT-d)",
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NULL);
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NULL);
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object_property_add_bool(obj, "suppress-vmdesc",
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machine_get_suppress_vmdesc,
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machine_set_suppress_vmdesc, NULL);
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object_property_set_description(obj, "suppress-vmdesc",
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"Set on to disable self-describing migration",
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NULL);
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/* Register notifier when init is done for sysbus sanity checks */
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/* Register notifier when init is done for sysbus sanity checks */
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ms->sysbus_notifier.notify = machine_init_notify;
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ms->sysbus_notifier.notify = machine_init_notify;
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@ -143,6 +143,7 @@ struct MachineState {
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bool usb;
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bool usb;
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char *firmware;
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char *firmware;
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bool iommu;
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bool iommu;
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bool suppress_vmdesc;
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ram_addr_t ram_size;
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ram_addr_t ram_size;
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ram_addr_t maxram_size;
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ram_addr_t maxram_size;
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@ -39,7 +39,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
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" mem-merge=on|off controls memory merge support (default: on)\n"
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" mem-merge=on|off controls memory merge support (default: on)\n"
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" iommu=on|off controls emulated Intel IOMMU (VT-d) support (default=off)\n"
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" iommu=on|off controls emulated Intel IOMMU (VT-d) support (default=off)\n"
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" aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n"
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" aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n"
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" dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n",
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" dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n"
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" suppress-vmdesc=on|off disables self-describing migration (default=off)\n",
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QEMU_ARCH_ALL)
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QEMU_ARCH_ALL)
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STEXI
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STEXI
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@item -machine [type=]@var{name}[,prop=@var{value}[,...]]
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@item -machine [type=]@var{name}[,prop=@var{value}[,...]]
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8
savevm.c
8
savevm.c
@ -710,6 +710,12 @@ int qemu_savevm_state_iterate(QEMUFile *f)
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return ret;
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return ret;
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}
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}
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static bool should_send_vmdesc(void)
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{
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MachineState *machine = MACHINE(qdev_get_machine());
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return !machine->suppress_vmdesc;
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}
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void qemu_savevm_state_complete(QEMUFile *f)
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void qemu_savevm_state_complete(QEMUFile *f)
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{
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{
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QJSON *vmdesc;
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QJSON *vmdesc;
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@ -782,9 +788,11 @@ void qemu_savevm_state_complete(QEMUFile *f)
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qjson_finish(vmdesc);
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qjson_finish(vmdesc);
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vmdesc_len = strlen(qjson_get_str(vmdesc));
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vmdesc_len = strlen(qjson_get_str(vmdesc));
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if (should_send_vmdesc()) {
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qemu_put_byte(f, QEMU_VM_VMDESCRIPTION);
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qemu_put_byte(f, QEMU_VM_VMDESCRIPTION);
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qemu_put_be32(f, vmdesc_len);
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qemu_put_be32(f, vmdesc_len);
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qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len);
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qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len);
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}
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object_unref(OBJECT(vmdesc));
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object_unref(OBJECT(vmdesc));
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qemu_fflush(f);
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qemu_fflush(f);
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