libxl: set shadow memory for any guest type, not only HVM

Otherwise starting PVH guest will result in "arch_setup_bootlate:
mapping shared_info failed (pfn=..., rc=-1, errno: 12): Internal error".

After this change the behavior is the same as in `xl`.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Jim Fehlig <jfehlig@suse.com>

src/libxl/libxl_conf.c

@@ -634,11 +634,6 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
             return -1;
         }
 #endif
-
-        /* Allow libxl to calculate shadow memory requirements */
-        b_info->shadow_memkb =
-            libxl_get_required_shadow_memory(b_info->max_memkb,
-                                             b_info->max_vcpus);
     } else {
         /*
          * For compatibility with the legacy xen toolstack, default to pygrub
@@ -692,6 +687,11 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
         }
     }
 
+    /* Allow libxl to calculate shadow memory requirements */
+    b_info->shadow_memkb =
+        libxl_get_required_shadow_memory(b_info->max_memkb,
+                                         b_info->max_vcpus);
+
     return 0;
 }
 

tests/libxlxml2domconfigdata/basic-pv.json

@@ -14,6 +14,7 @@
         ],
         "max_memkb": 524288,
         "target_memkb": 524288,
+        "shadow_memkb": 8192,
         "sched_params": {
 
         },

tests/libxlxml2domconfigdata/multiple-ip.json

@@ -14,6 +14,7 @@
         ],
         "max_memkb": 524288,
         "target_memkb": 524288,
+        "shadow_memkb": 8192,
         "sched_params": {
 
         },