Re: [Qemu-devel] [PATCH COLO-Frame v15 28/38] migration/savevm: Export two helper functions for savevm process

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

* zhanghailiang (zhang.zhanghailiang@huawei.com) wrote:
> We add a new helper functions qemu_savevm_live_state(),
> and make qemu_save_device_state() public.
> 
> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Again the extra function doesn't do much; but it's best to wrap
teh explicit EOF byte in a savevm function.

Dave

> ---
> v14:
> - New patch split from previous
>  'COLO: Separate the process of saving/loading ram and device state
> ---
>  include/sysemu/sysemu.h |  3 +++
>  migration/savevm.c      | 15 +++++++++++----
>  2 files changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index c0694a1..7b1748c 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -133,6 +133,9 @@ void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,
>                                             uint64_t *start_list,
>                                             uint64_t *length_list);
>  
> +void qemu_savevm_live_state(QEMUFile *f);
> +int qemu_save_device_state(QEMUFile *f);
> +
>  int qemu_loadvm_state(QEMUFile *f);
>  int qemu_loadvm_state_begin(QEMUFile *f);
>  int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis);
> diff --git a/migration/savevm.c b/migration/savevm.c
> index 954e0a7..60c7b57 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -1192,13 +1192,20 @@ static int qemu_savevm_state(QEMUFile *f, Error **errp)
>      return ret;
>  }
>  
> -static int qemu_save_device_state(QEMUFile *f)
> +void qemu_savevm_live_state(QEMUFile *f)
>  {
> -    SaveStateEntry *se;
> +    /* save QEMU_VM_SECTION_END section */
> +    qemu_savevm_state_complete_precopy(f, true);
> +    qemu_put_byte(f, QEMU_VM_EOF);
> +}
>  
> -    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
> -    qemu_put_be32(f, QEMU_VM_FILE_VERSION);
> +int qemu_save_device_state(QEMUFile *f)
> +{
> +    SaveStateEntry *se;
>  
> +    if (!migration_in_colo_state()) {
> +        qemu_savevm_state_header(f);
> +    }
>      cpu_synchronize_all_states();
>  
>      QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
> -- 
> 1.8.3.1
> 
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK