Hi Andrew,

On 05/02/2020 16:50, Andrew Cooper wrote:
diff --git a/xen/arch/arm/hvm.c b/xen/arch/arm/hvm.c
index 76b27c9168..f3426f37fe 100644
--- a/xen/arch/arm/hvm.c
+++ b/xen/arch/arm/hvm.c
@@ -46,7 +46,8 @@ long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) 
arg)
          if ( copy_from_guest(&a, arg, 1) )
              return -EFAULT;
- if ( a.index >= HVM_NR_PARAMS )
+        if ( a.index >= HVM_NR_PARAMS ||
+             a.index == HVM_PARAM_PAE_ENABLED )
              return -EINVAL;

For the small Arm part:

Acked-by: Julien Grall <jul...@xen.org>

--
Julien Grall

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