[PATCH v4 2/3] libxl: add a 'disable_fifo_evtchn' flag to libxl_domain_build_info ...

[Paul Durrant <paul@xxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

...to control setting the domain create flag XEN_DOMCTL_CDF_disable_fifo.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Signed-off-by: Eslam Elnikety <elnikety@xxxxxxxxxx>
---
Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>

v4:
 - New in v4
---
 tools/include/libxl.h            | 8 ++++++++
 tools/libs/light/libxl_create.c  | 5 +++++
 tools/libs/light/libxl_types.idl | 1 +
 3 files changed, 14 insertions(+)

diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 1ea5b4f446e8..fe0aad632c08 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -444,6 +444,14 @@
  */
 #define LIBXL_HAVE_DISK_SAFE_REMOVE 1
 
+/*
+ * LIBXL_HAVE_BUILDINFO_DISABLE_EVTCHN_FIFO indicates that
+ * libxl_domain_build_info has a disable_evtchn_fifo (boolean) field
+ * to determine whether the EVTCHNOPs to initialize and manipulate FIFO
+ * event channels are exposed to the guest.
+ */
+#define LIBXL_HAVE_BUILDINFO_DISABLE_EVTCHN_FIFO 1
+
 /*
  * libxl ABI compatibility
  *
diff --git a/tools/libs/light/libxl_create.c b/tools/libs/light/libxl_create.c
index 321a13e519b5..abbbd91442c0 100644
--- a/tools/libs/light/libxl_create.c
+++ b/tools/libs/light/libxl_create.c
@@ -263,6 +263,8 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
     if (!b_info->event_channels)
         b_info->event_channels = 1023;
 
+    libxl_defbool_setdefault(&b_info->disable_evtchn_fifo, false);
+
     libxl__arch_domain_build_info_setdefault(gc, b_info);
     libxl_defbool_setdefault(&b_info->dm_restrict, false);
 
@@ -609,6 +611,9 @@ int libxl__domain_make(libxl__gc *gc, libxl_domain_config 
*d_config,
             .max_maptrack_frames = b_info->max_maptrack_frames,
         };
 
+        if (libxl_defbool_val(b_info->disable_evtchn_fifo))
+            create.flags |= XEN_DOMCTL_CDF_disable_fifo;
+
         if (info->type != LIBXL_DOMAIN_TYPE_PV) {
             create.flags |= XEN_DOMCTL_CDF_hvm;
 
diff --git a/tools/libs/light/libxl_types.idl b/tools/libs/light/libxl_types.idl
index 9d3f05f39978..fa3f6ec3425e 100644
--- a/tools/libs/light/libxl_types.idl
+++ b/tools/libs/light/libxl_types.idl
@@ -541,6 +541,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
     ("iomem",            Array(libxl_iomem_range, "num_iomem")),
     ("claim_mode",          libxl_defbool),
     ("event_channels",   uint32),
+    ("disable_evtchn_fifo",libxl_defbool),
     ("kernel",           string),
     ("cmdline",          string),
     ("ramdisk",          string),
-- 
2.20.1