On Fri, 2015-12-18 at 14:14 +0100, Juergen Gross wrote:
> Create the xenstore domain with the xs_domain flag specified. This
> enables us to test whether such a domain is already running before
> we create it. As there ought to be only one xenstore in the system
> we don't need to start another one.
>
> Signed-off-by: Juergen Gross <jgr...@suse.com>
> ---
> tools/helpers/init-xenstore-domain.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/tools/helpers/init-xenstore-domain.c b/tools/helpers/init-
> xenstore-domain.c
> index 17f0151..4cd9e0f 100644
> --- a/tools/helpers/init-xenstore-domain.c
> +++ b/tools/helpers/init-xenstore-domain.c
> @@ -66,7 +66,8 @@ static int build(xc_interface *xch)
> } else {
> ssid = SECINITSID_DOMU;
> }
> - rv = xc_domain_create(xch, ssid, handle, 0, &domid, NULL);
> + rv = xc_domain_create(xch, ssid, handle, XEN_DOMCTL_CDF_xs_domain,
> + &domid, NULL);
> if (rv) {
> fprintf(stderr, "xc_domain_create failed\n");
> goto err;
> @@ -165,6 +166,21 @@ err:
> return rv;
> }
>
> +static int check_domain(xc_interface *xch)
> +{
> + xc_dominfo_t info;
> + uint32_t dom;
> +
> + dom = 0;
You can pretty safely skip dom0 I think?
> + while (xc_domain_getinfo(xch, dom, 1, &info) == 1) {
Logging errors (i.e. on return < 0) would be nice I think.
> + if (info.xs_domain)
> + return 1;
> + dom = info.domid + 1;
> + }
> +
> + return 0;
> +}
> +
> int main(int argc, char** argv)
> {
> int opt;
> @@ -204,7 +220,12 @@ int main(int argc, char** argv)
> return 1;
> }
>
> - rv = build(xch);
> + rv = check_domain(xch);
> +
> + if (!rv)
> + rv = build(xch);
> + else
> + fprintf(stderr, "xenstore domain already present.\n");
>
> xc_interface_close(xch);
>
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