Re: [Xen-devel] [PATCH 4 of 6] libxl: support suspend_cancel in domain_resume

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-01-31 at 01:05 +0000, rshriram@xxxxxxxxx wrote:
> # HG changeset patch
> # User Shriram Rajagopalan <rshriram@xxxxxxxxx>
> # Date 1327971527 28800
> # Node ID efe92d80c47487485056266a1404a8d2817b7f09
> # Parent  cd3d43d88c0568142dd061e744c34479e1a440f4
> libxl: support suspend_cancel in domain_resume
> 
> Add an extra parameter to libxl_domain_resume indicating
> if the caller wishes to use the SUSPEND_CANCEL style
> resume instead of the normal resume.
> 
> Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
> 
> diff -r cd3d43d88c05 -r efe92d80c474 tools/libxl/libxl.c
> --- a/tools/libxl/libxl.c     Mon Jan 30 16:58:31 2012 -0800
> +++ b/tools/libxl/libxl.c     Mon Jan 30 16:58:47 2012 -0800
> @@ -229,24 +229,29 @@ int libxl_domain_rename(libxl_ctx *ctx, 
>      return rc;
>  }
>  
> -int libxl_domain_resume(libxl_ctx *ctx, uint32_t domid)
> +int libxl_domain_resume(libxl_ctx *ctx, uint32_t domid, int fast)
>  {
>      GC_INIT(ctx);
>      int rc = 0;
>  
> -    if (LIBXL__DOMAIN_IS_TYPE(gc,  domid, HVM)) {
> -        LIBXL__LOG(ctx, LIBXL__LOG_DEBUG, "Called domain_resume on "
> -                "non-cooperative hvm domain %u", domid);
> -        rc = ERROR_NI;
> -        goto out;
> -    }
> -    if (xc_domain_resume(ctx->xch, domid, 0)) {
> +    if (xc_domain_resume(ctx->xch, domid, fast)) {
>          LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
>                          "xc_domain_resume failed for domain %u",
>                          domid);
>          rc = ERROR_FAIL;
>          goto out;
>      }
> +
> +    if (LIBXL__DOMAIN_IS_TYPE(gc,  domid, HVM)) {
> +        rc = libxl__domain_resume_device_model(gc, domid);
> +        if (rc) {
> +            LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
> +                       "failed to resume device model for domain %u:%d",
> +                       domid, rc);
> +            goto out;
> +        }
> +    }
> +
>      if (!xs_resume_domain(ctx->xsh, domid)) {
>          LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
>                          "xs_resume_domain failed for domain %u",
> diff -r cd3d43d88c05 -r efe92d80c474 tools/libxl/libxl.h
> --- a/tools/libxl/libxl.h     Mon Jan 30 16:58:31 2012 -0800
> +++ b/tools/libxl/libxl.h     Mon Jan 30 16:58:47 2012 -0800
> @@ -268,7 +268,7 @@ int libxl_domain_create_restore(libxl_ct
>  void libxl_domain_config_dispose(libxl_domain_config *d_config);
>  int libxl_domain_suspend(libxl_ctx *ctx, libxl_domain_suspend_info *info,
>                            uint32_t domid, int fd);
> -int libxl_domain_resume(libxl_ctx *ctx, uint32_t domid);
> +int libxl_domain_resume(libxl_ctx *ctx, uint32_t domid, int fast);

Please can you add a few words about what fast means and when its use
would be appropriate.

I'm not sure fast is right word -- it happens that this mechanism is
faster but isn't the real meaning "co-operative" or something along
those lines?

Would a better name be libxl_domain_suspend_cancel, sharing a common
helper internally with libxl_domain_resume?

Ian.

>  int libxl_domain_shutdown(libxl_ctx *ctx, uint32_t domid);
>  int libxl_domain_reboot(libxl_ctx *ctx, uint32_t domid);
>  int libxl_domain_destroy(libxl_ctx *ctx, uint32_t domid);
> diff -r cd3d43d88c05 -r efe92d80c474 tools/libxl/xl_cmdimpl.c
> --- a/tools/libxl/xl_cmdimpl.c        Mon Jan 30 16:58:31 2012 -0800
> +++ b/tools/libxl/xl_cmdimpl.c        Mon Jan 30 16:58:47 2012 -0800
> @@ -2751,7 +2751,7 @@ static void migrate_domain(const char *d
>          if (common_domname) {
>              libxl_domain_rename(ctx, domid, away_domname, common_domname);
>          }
> -        rc = libxl_domain_resume(ctx, domid);
> +        rc = libxl_domain_resume(ctx, domid, 1);
>          if (!rc) fprintf(stderr, "migration sender: Resumed OK.\n");
>  
>          fprintf(stderr, "Migration failed due to problems at target.\n");
> @@ -2773,7 +2773,7 @@ static void migrate_domain(const char *d
>      close(send_fd);
>      migration_child_report(child, recv_fd);
>      fprintf(stderr, "Migration failed, resuming at sender.\n");
> -    libxl_domain_resume(ctx, domid);
> +    libxl_domain_resume(ctx, domid, 1);
>      exit(-ERROR_FAIL);
>  
>   failed_badly:



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