Re: [Qemu-devel] [PATCH v2 3/5] migration: Create load_setup()/cleanup() methods

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Juan Quintela (quintela@redhat.com) wrote:
> We need to do things at load time and at cleanup time.
> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  include/migration/register.h |  2 ++
>  migration/savevm.c           | 44 ++++++++++++++++++++++++++++++++++++++++++++
>  migration/trace-events       |  2 ++
>  3 files changed, 48 insertions(+)
> 
> diff --git a/include/migration/register.h b/include/migration/register.h
> index 9ad1e4c..4b5c0e0 100644
> --- a/include/migration/register.h
> +++ b/include/migration/register.h
> @@ -42,6 +42,8 @@ typedef struct SaveVMHandlers {
>                                uint64_t *non_postcopiable_pending,
>                                uint64_t *postcopiable_pending);
>      LoadStateHandler *load_state;
> +    int (*load_setup)(QEMUFile *f, void *opaque);
> +    int (*load_cleanup)(void *opaque);
>  } SaveVMHandlers;
>  
>  int register_savevm_live(DeviceState *dev,
> diff --git a/migration/savevm.c b/migration/savevm.c
> index fb93931..ed36f35 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -1912,6 +1912,43 @@ qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis)
>      return 0;
>  }
>  
> +static int qemu_loadvm_state_setup(QEMUFile *f)
> +{
> +    SaveStateEntry *se;
> +    int ret;
> +
> +    trace_loadvm_state_setup();
> +    QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
> +        if (!se->ops || !se->ops->load_setup) {
> +            continue;
> +        }
> +        if (se->ops && se->ops->is_active) {
> +            if (!se->ops->is_active(se->opaque)) {
> +                continue;
> +            }
> +        }
> +
> +        ret = se->ops->load_setup(f, se->opaque);
> +        if (ret < 0) {
> +            qemu_file_set_error(f, ret);
> +            return ret;
> +        }
> +    }
> +    return 0;
> +}
> +
> +static void qemu_loadvm_state_cleanup(void)
> +{
> +    SaveStateEntry *se;
> +
> +    trace_loadvm_state_cleanup();
> +    QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
> +        if (se->ops && se->ops->load_cleanup) {
> +            se->ops->load_cleanup(se->opaque);
> +        }
> +    }
> +}
> +
>  static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis)
>  {
>      uint8_t section_type;
> @@ -1984,6 +2021,12 @@ int qemu_loadvm_state(QEMUFile *f)
>          return -ENOTSUP;
>      }
>  
> +
> +    if (qemu_loadvm_state_setup(f) != 0) {
> +        error_report("Load state of one device failed");
> +        return -EINVAL;

I'd prefer if that was an error report in qemu_loadvm_state_setup,
because then it would be easy to print the device name rather than
'one'.

Dave
> +    }
> +
>      if (!savevm_state.skip_configuration || enforce_config_section()) {
>          if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) {
>              error_report("Configuration section missing");
> @@ -2047,6 +2090,7 @@ int qemu_loadvm_state(QEMUFile *f)
>          }
>      }
>  
> +    qemu_loadvm_state_cleanup();
>      cpu_synchronize_all_post_init();
>  
>      return ret;
> diff --git a/migration/trace-events b/migration/trace-events
> index 9669e94..cb2c4b5 100644
> --- a/migration/trace-events
> +++ b/migration/trace-events
> @@ -7,6 +7,8 @@ qemu_loadvm_state_section_partend(uint32_t section_id) "%u"
>  qemu_loadvm_state_post_main(int ret) "%d"
>  qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u"
>  qemu_savevm_send_packaged(void) ""
> +loadvm_state_setup(void) ""
> +loadvm_state_cleanup(void) ""
>  loadvm_handle_cmd_packaged(unsigned int length) "%u"
>  loadvm_handle_cmd_packaged_main(int ret) "%d"
>  loadvm_handle_cmd_packaged_received(int ret) "%d"
> -- 
> 2.9.4
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK