Revert "xen/arm: Allocate memory for dom0 from the bottom with the 1:1 Workaround"

This reverts commit 6c21cb36e2.

The Linux = issue which this works around was fixed in v3.13 via f52bb722547f
"ARM: mm: Correct virt_to_phys patching for 64 bit physical addresses".

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

xen/arch/arm/domain_build.c

@@ -69,19 +69,12 @@ static void allocate_memory_11(struct domain *d, struct kernel_info *kinfo)
 {
     paddr_t start;
     paddr_t size;
-    struct page_info *pg = NULL;
+    struct page_info *pg;
     unsigned int order = get_order_from_bytes(dom0_mem);
     int res;
     paddr_t spfn;
-    unsigned int bits;
-
-    for ( bits = PAGE_SHIFT + 1; bits < PADDR_BITS; bits++ )
-    {
-        pg = alloc_domheap_pages(d, order, MEMF_bits(bits));
-        if ( pg != NULL )
-            break;
-    }
 
+    pg = alloc_domheap_pages(d, order, 0);
     if ( !pg )
         panic("Failed to allocate contiguous memory for dom0");