[libvirt] [Xen-devel] [PATCH] Convert libxl driver to Xen 4.2

[Ian Campbell]

On Mon, 2012-11-26 at 22:28 +0000, Jim Fehlig wrote:
> 
> @@ -62,6 +63,52 @@ struct guest_arch {
>  static const char *xen_cap_re = "(xen|hvm)-[[:digit:]]+\
> \.[[:digit:]]+-(x86_32|x86_64|ia64|powerpc64)(p|be)?";
>  static regex_t xen_cap_rec;
> 
> +/*
> + * Copied from split_string_into_string_list() in
> + * $xen-sources/tools/libxl/xl_cmdimpl.c, which is licensed LGPL v2.1.
> + */

Looks like I am the sole author of that original function
(24250:71ecbef5645f xen-unstable.hg). I'd more than likely be happy to
relicence under whatever terms would be suitable for libvirt -- what are
they?

In particular I'd be happy with LGPL v2.1+ if that's what it takes.

> +static int
> +libxlSplitStringIntoStringList(const char *str,
> +                               const char *delim,
> +                               libxl_string_list *psl) 
[...]

> @@ -393,26 +458,25 @@ libxlMakeDomBuildInfo(virDomainDefPtr def, libxl_domain_config *d_config)
>      int hvm = STREQ(def->os.type, "hvm");
>      int i;
> 
> -    /* Currently, libxenlight only supports 32 vcpus per domain.
> -     * cur_vcpus member of struct libxl_domain_build_info is defined
> -     * as an int, but its semantic is a bitmap of online vcpus, so
> -     * only 32 can be represented.
> +    /*
> +     * libxl in Xen 4.2 supports up to 128 vcpus, cur_vcpus was replaced
> +     * by avail_vcpus of type libxl_bitmap

Do you happen to know where the 128 number comes from? I think libxl is
mostly agnostic about the size of this bitmap and should just be
exposing whatever the hypervisor supports.

>       */
> -    if (def->maxvcpus > 32 || def->vcpus > 32) {
> -        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> -                       _("This version of libxenlight only supports 32 "
> -                         "vcpus per domain"));
> +    if (def->maxvcpus > LIBXL_MAXVCPUS || def->vcpus > LIBXL_MAXVCPUS) {
> +        virReportError(VIR_ERR_INTERNAL_ERROR,
> +                       _("This version of libxenlight only supports %u "
> +                         "vcpus per domain"), LIBXL_MAXVCPUS);
>          return -1;
>      }