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[PATCH] libxl: respect unset video_memkb for Dom0


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 27 Aug 2025 07:56:00 +0200
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  • Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
  • Delivery-date: Wed, 27 Aug 2025 05:56:11 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Without this, Dom0 will have have a curiously off-by-1 target_memkb
value displayed by "xl list -l".

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
In retrieve_domain_configuration_end(), isn't it the wrong way round to
set both ->b_info.target_memkb and ->b_info.max_memkb only after calling
libxl__get_targetmem_fudge(), when that uses the two fields? This way we
could as well use ->b_info->video_memkb directly there.

Of course this may point at a bigger problem, as other fields may
similarly never be set for Dom0.

--- a/tools/libs/light/libxl_internal.h
+++ b/tools/libs/light/libxl_internal.h
@@ -4685,7 +4685,10 @@ uint64_t libxl__get_targetmem_fudge(libx
                                 info->max_memkb > info->target_memkb)
                                 ? LIBXL_MAXMEM_CONSTANT : 0;
 
-    return info->video_memkb + mem_target_fudge;
+    if (info->video_memkb != LIBXL_MEMKB_DEFAULT)
+        mem_target_fudge += info->video_memkb;
+
+    return mem_target_fudge;
 }
 
 int libxl__get_memory_target(libxl__gc *gc, uint32_t domid,



 


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