1 files changed, 3 insertions, 2 deletions

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 105db2501050..b1dbdaa23ecc 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -204,6 +204,9 @@ char * __init xen_memory_setup(void)
          * Even though this is normal, usable memory under Xen, reserve
          * ISA memory anyway because too many things think they can poke
          * about in there.
+         *
+         * In a dom0 kernel, this region is identity mapped with the
+         * hardware ISA area, so it really is out of bounds.
          */
         e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
                         E820_RESERVED);
@@ -367,7 +370,5 @@ void __init xen_arch_setup(void)
 
         pm_idle = xen_idle;
 
-        paravirt_disable_iospace();
-
         fiddle_vdso();
 }