Re: [Xen-devel] [PATCH v2 15/18] libxl: introduce libxl_retrieve_domain_configuration

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2014-07-30 at 19:23 +0100, Wei Liu wrote:
> +    /* Domain name */

> +    /* Domain UUID */

Wasn't there a new libxl__update_domain_configuration which does a bunch
of this for you already?

> +        /* "target" */
> +        rc = libxl_get_memory_target(ctx, domid, &memory);
> +        if (rc) {
> +            LOG(ERROR, "fail to get memory target for domain %d", domid);
> +            goto out;
> +        }
> +        /* If the domain is HVM domain, target memory in xenstore is
> +         * smaller than what user has asked for. The difference is
> +         * video_memkb, so add it back. Otherwise domain rebuild will
> +         * fail.

Ahem, lovely. Could you add a note at the point on creation where the
opposite happens pointing here for the benefit of anyone who touched
it...

> +         */
> +        if (d_config->b_info.type == LIBXL_DOMAIN_TYPE_HVM)
> +            d_config->b_info.target_memkb =
> +                memory + d_config->b_info.video_memkb;
> +
> +        /* "static-max" */
> +        rc = libxl_get_memory_static_max(ctx, domid, &memory);

This and the libxl_get_memory_target are implemented in terms of a very
handy internal helper that you added which returns both at the same
time ;-)

Ian.


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