[Xen-devel] [XEN PATCH for-4.13 v2 3/9] libxl: libxl__domain_config_setdefault: New function

From: Ian Jackson <ian.jackson@eu.citrix.com>
To: <xen-devel@lists.xenproject.org>
Cc: Wei Liu <wl@xen.org>, Andrew Cooper <Andrew.Cooper3@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	Paul Durrant <pdurrant@gmail.com>,
	Jan Beulich <jbeulich@suse.com>,
	Anthony PERARD <anthony.perard@citrix.com>
Subject: [Xen-devel] [XEN PATCH for-4.13 v2 3/9] libxl: libxl__domain_config_setdefault: New function
Date: Thu, 10 Oct 2019 16:11:05 +0100	[thread overview]
Message-ID: <20191010151111.22125-4-ian.jackson@eu.citrix.com> (raw)
In-Reply-To: <20191010151111.22125-1-ian.jackson@eu.citrix.com>

Break out this into a new function.  We are going to want to call it
from a new call site.

Unfortunately not all of the defaults can be moved into the new
function without changing the order in which things are done.  That
does not seem wise at this stage of the release.  The effect is that
additional calls to libxl__domain_config_setdefault (which are going
to be introduced) do not quite set everything.  But they will do what
is needed.  After Xen 4.13 is done, we should move those settings into
the right order.

No functional change.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
---
v2: Add missing error check
---
 tools/libxl/libxl_create.c   | 41 +++++++++++++++++++++++++++++------------
 tools/libxl/libxl_internal.h |  3 +++
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 099761a2d7..fd8bb22be9 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -862,22 +862,14 @@ static void domcreate_destruction_cb(libxl__egc *egc,
                                      libxl__domain_destroy_state *dds,
                                      int rc);
 
-static void initiate_domain_create(libxl__egc *egc,
-                                   libxl__domain_create_state *dcs)
+int libxl__domain_config_setdefault(libxl__gc *gc,
+                                    libxl_domain_config *d_config,
+                                    uint32_t domid)
 {
-    STATE_AO_GC(dcs->ao);
     libxl_ctx *ctx = libxl__gc_owner(gc);
-    uint32_t domid;
-    int i, ret;
+    int ret;
     bool pod_enabled = false;
 
-    /* convenience aliases */
-    libxl_domain_config *const d_config = dcs->guest_config;
-    const int restore_fd = dcs->restore_fd;
-
-    domid = dcs->domid_soft_reset;
-    libxl__domain_build_state_init(&dcs->build_state);
-
     if (d_config->c_info.ssid_label) {
         char *s = d_config->c_info.ssid_label;
         ret = libxl_flask_context_to_sid(ctx, s, strlen(s),
@@ -1008,6 +1000,28 @@ static void initiate_domain_create(libxl__egc *egc,
         goto error_out;
     }
 
+    ret = 0;
+ error_out:
+    return ret;
+}
+
+static void initiate_domain_create(libxl__egc *egc,
+                                   libxl__domain_create_state *dcs)
+{
+    STATE_AO_GC(dcs->ao);
+    uint32_t domid;
+    int i, ret;
+
+    /* convenience aliases */
+    libxl_domain_config *const d_config = dcs->guest_config;
+    const int restore_fd = dcs->restore_fd;
+
+    domid = dcs->domid_soft_reset;
+    libxl__domain_build_state_init(&dcs->build_state);
+
+    ret = libxl__domain_config_setdefault(gc,d_config,domid);
+    if (ret) goto error_out;
+
     ret = libxl__domain_make(gc, d_config, &dcs->build_state, &domid);
     if (ret) {
         LOGD(ERROR, domid, "cannot make domain: %d", ret);
@@ -1019,6 +1033,9 @@ static void initiate_domain_create(libxl__egc *egc,
     dcs->guest_domid = domid;
     dcs->sdss.dm.guest_domid = 0; /* means we haven't spawned */
 
+    /* post-4.13 todo: move these next bits of defaulting to
+     * libxl__domain_config_setdefault */
+
     /*
      * Set the dm version quite early so that libxl doesn't have to pass the
      * build info around just to know if the domain has a device model or not.
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index d2d5af746b..50ac7b64ed 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1440,6 +1440,9 @@ _hidden int libxl__resolve_domid(libxl__gc *gc, const char *name,
  *     All libxl API functions are expected to have arranged for this
  *     to be called before using any values within these structures.
  */
+_hidden int libxl__domain_config_setdefault(libxl__gc *gc,
+                                            libxl_domain_config *d_config,
+                                            uint32_t domid /* logging only */);
 _hidden int libxl__domain_create_info_setdefault(libxl__gc *gc,
                                         libxl_domain_create_info *c_info);
 _hidden int libxl__domain_build_info_setdefault(libxl__gc *gc,
-- 
2.11.0


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