[Xen-devel] [PATCH v4 05/22] xl: introduce a domain type option

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Introduce a new type option to xl configuration files in order to
specify the domain type. This supersedes the current builder option.

The new option is documented in the xl.cfg man page, and the previous
builder option is marked as deprecated.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes since v3:
 - Use a temporary variable to store the builder option.
 - Remove the macro.

Changes since v2:
 - Left shift error message.
 - Detect wrong combination of 'builder' and 'type' options.
 - Do not complain if both type and builder and set to the same value.
 - Drop Wei's Ack (patch changed substantially).
---
 docs/man/xl.cfg.pod.5.in | 23 +++++++++++++++++++++--
 tools/xl/xl_parse.c      | 44 ++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 61 insertions(+), 6 deletions(-)

diff --git a/docs/man/xl.cfg.pod.5.in b/docs/man/xl.cfg.pod.5.in
index e7ab67395b..b4bbc8f9a7 100644
--- a/docs/man/xl.cfg.pod.5.in
+++ b/docs/man/xl.cfg.pod.5.in
@@ -54,9 +54,9 @@ Pairs may be separated either by a newline or a semicolon.  
Both
 of the following are valid:
 
   name="h0"
-  builder="hvm"
+  type="hvm"
 
-  name="h0"; builder="hvm"
+  name="h0"; type="hvm"
 
 =head1 OPTIONS
 
@@ -77,6 +77,25 @@ single host must be unique.
 
 =over 4
 
+=item B<type="pv">
+
+Specifies that this is to be a PV domain, suitable for hosting Xen-aware
+guest operating systems. This is the default.
+
+=item B<type="hvm">
+
+Specifies that this is to be an HVM domain. That is, a fully virtualised
+computer with emulated BIOS, disk and network peripherals, etc.
+
+=back
+
+=head3 Deprecated guest type selection
+
+Note that the builder option is being deprecated in favor of the type
+option.
+
+=over 4
+
 =item B<builder="generic">
 
 Specifies that this is to be a PV domain, suitable for hosting Xen-aware guest
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 8812898c36..408949a957 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -900,10 +900,46 @@ void parse_config_data(const char *config_source,
     }
 
     libxl_defbool_set(&c_info->run_hotplug_scripts, run_hotplug_scripts);
-    c_info->type = LIBXL_DOMAIN_TYPE_PV;
-    if (!xlu_cfg_get_string (config, "builder", &buf, 0) &&
-        !strncmp(buf, "hvm", strlen(buf)))
-        c_info->type = LIBXL_DOMAIN_TYPE_HVM;
+
+    if (!xlu_cfg_get_string(config, "type", &buf, 0)) {
+        if (!strncmp(buf, "hvm", strlen(buf)))
+            c_info->type = LIBXL_DOMAIN_TYPE_HVM;
+        else if (!strncmp(buf, "pv", strlen(buf)))
+            c_info->type = LIBXL_DOMAIN_TYPE_PV;
+        else {
+            fprintf(stderr, "Invalid domain type %s.\n", buf);
+            exit(1);
+        }
+    }
+
+    /* Deprecated since Xen 4.10. */
+    if (!xlu_cfg_get_string(config, "builder", &buf, 0)) {
+        libxl_domain_type builder_type;
+
+        if (c_info->type == LIBXL_DOMAIN_TYPE_INVALID)
+            fprintf(stderr,
+"The \"builder\" option is being deprecated, please use \"type\" instead.\n");
+        if (!strncmp(buf, "hvm", strlen(buf)))
+            builder_type = LIBXL_DOMAIN_TYPE_HVM;
+        else if (!strncmp(buf, "generic", strlen(buf)))
+            builder_type = LIBXL_DOMAIN_TYPE_PV;
+        else {
+            fprintf(stderr, "Invalid domain type %s.\n", buf);
+            exit(1);
+        }
+
+        if (c_info->type != LIBXL_DOMAIN_TYPE_INVALID &&
+            c_info->type != builder_type)
+        {
+            fprintf(stderr,
+            "Contradicting \"builder\" and \"type\" options specified.\n");
+            exit(1);
+        }
+        c_info->type = builder_type;
+    }
+
+    if (c_info->type == LIBXL_DOMAIN_TYPE_INVALID)
+        c_info->type = LIBXL_DOMAIN_TYPE_PV;
 
     xlu_cfg_get_defbool(config, "hap", &c_info->hap, 0);
 
-- 
2.13.5 (Apple Git-94)


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