Re: [Xen-devel] [PATCH v4 1/6] vl.c: do not save the RAM state when Xen is enabled

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

On 01/20/2012 11:21 AM, Stefano Stabellini wrote:
> From: Anthony PERARD<anthony.perard@xxxxxxxxxx>
>
> In the Xen case, the guest RAM is not handle by QEMU, and it is saved by
> Xen tools.
> So, we just avoid to register the RAM save state handler.
>
> Signed-off-by: Anthony PERARD<anthony.perard@xxxxxxxxxx>
> Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
> ---
>   vl.c |    6 ++++--
>   1 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/vl.c b/vl.c
> index ba55b35..6f0435b 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -3270,8 +3270,10 @@ int main(int argc, char **argv, char **envp)
>       default_drive(default_sdcard, snapshot, machine->use_scsi,
>                     IF_SD, 0, SD_OPTS);
>
> -    register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
> -                         ram_load, NULL);
> +    if (!xen_enabled()) {
> +        register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
> +                             ram_load, NULL);
> +    }

Why not introduce new Xen specific commands like I suggested on IRC?

This sort of change is extremely non-intuitive.  We should do as much as we can 
to avoid magic #ifdefs like this.
Regards,

Anthony Liguori

>       if (nb_numa_nodes>  0) {
>           int i;

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