As the code comment says, this will allow use of a 2Mb super page
mapping at the end of "low" memory.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -563,6 +563,13 @@ int libxl__domain_device_construct_rdm(l
/* Just check if RDM > our memory boundary. */
if (rdm_start > rdm_mem_boundary) {
/*
+ * For HAP guests round down to a 2Mb boundary to allow use
+ * of large page mappings.
+ */
+ if (libxl_defbool_val(d_config->c_info.hap)
+ && rdm_start > 0x200000)
+ rdm_start &= ~0x1fffff;
+ /*
* We will move downwards lowmem_end so we have to expand
* highmem_end.
*/
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