Re: [PATCH 03/27] tools/libxl: Stash all restore parameters in domain_create_state

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2015-06-15 at 14:44 +0100, Andrew Cooper wrote:
> Shortly more parameters will appear, and this saves unboxing each one.
> 
> No functional change.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> CC: Ian Campbell <Ian.Campbell@citrix.com>
> CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
> CC: Wei Liu <wei.liu2@citrix.com>
> ---
>  tools/libxl/libxl_create.c       |   12 ++++++------
>  tools/libxl/libxl_internal.h     |    2 +-
>  tools/libxl/libxl_save_callout.c |    2 +-
>  3 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
> index 86384d2..385891c 100644
> --- a/tools/libxl/libxl_create.c
> +++ b/tools/libxl/libxl_create.c
> @@ -1577,8 +1577,8 @@ static void domain_create_cb(libxl__egc *egc,
>                               int rc, uint32_t domid);
>  
>  static int do_domain_create(libxl_ctx *ctx, libxl_domain_config *d_config,
> -                            uint32_t *domid,
> -                            int restore_fd, int checkpointed_stream,
> +                            uint32_t *domid, int restore_fd,
> +                            const libxl_domain_restore_params *params,
>                              const libxl_asyncop_how *ao_how,
>                              const libxl_asyncprogress_how *aop_console_how)
>  {
> @@ -1591,8 +1591,8 @@ static int do_domain_create(libxl_ctx *ctx, libxl_domain_config *d_config,
>      libxl_domain_config_init(&cdcs->dcs.guest_config_saved);
>      libxl_domain_config_copy(ctx, &cdcs->dcs.guest_config_saved, d_config);
>      cdcs->dcs.restore_fd = restore_fd;
> +    if (params) cdcs->dcs.restore_params = *params;

Is this eventually going to become non-optional? I think not and its
validity is entirely intertwined with the validity of restore_fd (as I
suspect it was before, but I've not checked).

Perhaps an error check to that effect would be useful?

Anyway, I think what you've done here is correct, so:
        Acked-by: Ian Campbell <ian.campbell@citrix.com>
        
[...]
> @@ -3122,11 +3122,11 @@ struct libxl__domain_create_state {
>      libxl_domain_config *guest_config;
>      libxl_domain_config guest_config_saved; /* vanilla config */
>      int restore_fd;
> +    libxl_domain_restore_params restore_params;
>      libxl__domain_create_cb *callback;
>      libxl_asyncprogress_how aop_console_how;
>      /* private to domain_create */
>      int guest_domid;
> -    int checkpointed_stream;

This has, in effect moved from "private to domain_create" to "filled in
by user", I don't think the change here has actually changed its status,
but I suspect it was wrong before (alternatively restore_fd is in the
wrong place instead).

Ian.