[xen staging] libxl: Allow running qemu-xen in stubdomain

[patchbot@xxxxxxx]

commit 46587a30d4cb7702a8c2074c98d687b6f9602e6c
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Mon May 18 21:54:48 2020 -0400
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Mon May 18 23:23:44 2020 +0100

    libxl: Allow running qemu-xen in stubdomain
    
    Do not prohibit anymore using stubdomain with qemu-xen.
    To help distingushing MiniOS and Linux stubdomain, add helper inline
    functions libxl__stubdomain_is_linux() and
    libxl__stubdomain_is_linux_running(). Those should be used where really
    the difference is about MiniOS/Linux, not qemu-xen/qemu-xen-traditional.
    
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_create.c   |  9 ---------
 tools/libxl/libxl_internal.h | 17 +++++++++++++++++
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 5a043df15f..433947abab 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -171,15 +171,6 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
         }
     }
 
-    if (b_info->type == LIBXL_DOMAIN_TYPE_HVM &&
-        b_info->device_model_version !=
-            LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL &&
-        libxl_defbool_val(b_info->device_model_stubdomain)) {
-        LOG(ERROR,
-            "device model stubdomains require \"qemu-xen-traditional\"");
-        return ERROR_INVAL;
-    }
-
     if (!b_info->max_vcpus)
         b_info->max_vcpus = 1;
     if (!b_info->avail_vcpus.size) {
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index e5effd2ad1..d1ebdec8d2 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2324,6 +2324,23 @@ _hidden int 
libxl__device_model_version_running(libxl__gc *gc, uint32_t domid);
   /* Return the system-wide default device model */
 _hidden libxl_device_model_version libxl__default_device_model(libxl__gc *gc);
 
+static inline
+bool libxl__stubdomain_is_linux_running(libxl__gc *gc, uint32_t domid)
+{
+    /* same logic as in libxl__stubdomain_is_linux */
+    return libxl__device_model_version_running(gc, domid)
+        == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN;
+}
+
+static inline
+bool libxl__stubdomain_is_linux(libxl_domain_build_info *b_info)
+{
+    /* right now qemu-tranditional implies MiniOS stubdomain and qemu-xen
+     * implies Linux stubdomain */
+    return libxl_defbool_val(b_info->device_model_stubdomain) &&
+        b_info->device_model_version == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN;
+}
+
 #define DEVICE_MODEL_XS_PATH(gc, dm_domid, domid, fmt, _a...)              \
     libxl__sprintf(gc, "/local/domain/%u/device-model/%u" fmt, dm_domid,   \
                    domid, ##_a)
--
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