[RFC PATCH V4 18/18] libxl: add evtchn_extended_allowed flag

[Wei Liu <wei.liu2@citrix.com>]

Admins can add "evtchn_extended_allowed = 1" in domain config file to enable
extended event channel ABI for a domain.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
CC: Ian Jackson <ian.jackson@eu.citrix.com>
---
 docs/man/xl.cfg.pod.5       |   10 ++++++++++
 tools/libxl/libxl_create.c  |    4 ++++
 tools/libxl/libxl_types.idl |    1 +
 tools/libxl/xl_cmdimpl.c    |    3 +++
 4 files changed, 18 insertions(+)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index 25523c9..6e9b4ff 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -133,6 +133,16 @@ the same time, achieving efficient utilization of the host's CPUs and RAM.
 
 =back
 
+=head3 Event Channel ABIs
+
+=over 4
+
+=item B<evtchn_extended_allowed=BOOLEAN>
+
+Flag for allowing domain to use any of the extended event channel ABIs.
+
+=back
+
 =head3 CPU Scheduling
 
 =over 4
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index efeebf2..541e34b 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -35,6 +35,8 @@ int libxl__domain_create_info_setdefault(libxl__gc *gc,
         libxl_defbool_setdefault(&c_info->oos, true);
     }
 
+    libxl_defbool_setdefault(&c_info->evtchn_extended_allowed, false);
+
     libxl_defbool_setdefault(&c_info->run_hotplug_scripts, true);
 
     return 0;
@@ -406,6 +408,8 @@ int libxl__domain_make(libxl__gc *gc, libxl_domain_create_info *info,
         flags |= libxl_defbool_val(info->hap) ? XEN_DOMCTL_CDF_hap : 0;
         flags |= libxl_defbool_val(info->oos) ? 0 : XEN_DOMCTL_CDF_oos_off;
     }
+    flags |= libxl_defbool_val(info->evtchn_extended_allowed) ?
+             XEN_DOMCTL_CDF_evtchn_extended_allowed : 0;
     *domid = -1;
 
     /* Ultimately, handle is an array of 16 uint8_t, same as uuid */
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 5b080ed..2430827 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -237,6 +237,7 @@ libxl_domain_create_info = Struct("domain_create_info",[
     ("type",         libxl_domain_type),
     ("hap",          libxl_defbool),
     ("oos",          libxl_defbool),
+    ("evtchn_extended_allowed",libxl_defbool),
     ("ssidref",      uint32),
     ("name",         string),
     ("uuid",         libxl_uuid),
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index a98705e..1ad9b28 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -651,6 +651,9 @@ static void parse_config_data(const char *config_source,
 
     xlu_cfg_get_defbool(config, "oos", &c_info->oos, 0);
 
+    xlu_cfg_get_defbool(config, "evtchn_extended_allowed",
+                        &c_info->evtchn_extended_allowed, 0);
+
     if (!xlu_cfg_get_string (config, "pool", &buf, 0)) {
         c_info->poolid = -1;
         cpupool_qualifier_to_cpupoolid(buf, &c_info->poolid, NULL);
-- 
1.7.10.4