Index: xen-3.3.1-testing/tools/ioemu-remote/block-vpc.c
===================================================================
--- xen-3.3.1-testing.orig/tools/ioemu-remote/block-vpc.c
+++ xen-3.3.1-testing/tools/ioemu-remote/block-vpc.c
@@ -156,7 +156,7 @@ static inline int seek_to_sector(BlockDr
     if (pagetable_index > s->pagetable_entries || s->pagetable[pagetable_index] == 0xffffffff)
 	return -1; // not allocated
 
-    bitmap_offset = 512 * s->pagetable[pagetable_index];
+    bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
     block_offset = bitmap_offset + 512 + (512 * pageentry_index);
 
 //    printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",