D29304.id87457.diff
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	Index: sys/dev/xen/bus/xenpv.c
	===================================================================
	--- sys/dev/xen/bus/xenpv.c
	+++ sys/dev/xen/bus/xenpv.c
	@@ -55,13 +55,18 @@
	*
	* Since this is not possible on i386 just use any available memory
	* chunk above 1MB and hope we don't clash with anything else.
	+ *
	+ * Other architectures better document MMIO regions and drivers more
	+ * reliably reserve them. As such, allow using any unpopulated memory
	+ * region. The zero-page though is reserved and triggers special
	+ * behavior by nexus_alloc_resource().
	*/
	#ifdef __amd64__
	#define LOW_MEM_LIMIT 0x100000000ul
	#elif defined(__i386__)
	#define LOW_MEM_LIMIT 0x100000ul
	#else
	-#error "Unsupported architecture"
	+#define LOW_MEM_LIMIT PAGE_SIZE
	#endif

	static devclass_t xenpv_devclass;