s390/uv: handle destroy page legacy interface

Older firmware can return rc=0x107 rrc=0xd for destroy page if the
page is already non-secure. This should be handled like a success
as already done by newer firmware.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 1a80b54 ("s390/uv: add destroy page call")
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>

Author: borntraeger

arch/s390/kernel/uv.c

@@ -129,8 +129,15 @@ int uv_destroy_page(unsigned long paddr)
 		.paddr = paddr
 	};
 
-	if (uv_call(0, (u64)&uvcb))
+	if (uv_call(0, (u64)&uvcb)) {
+		/*
+		 * Older firmware uses 107/d as an indication of a non secure
+		 * page. Let us emulate the newer variant (no-op).
+		 */
+		if (uvcb.header.rc == 0x107 && uvcb.header.rrc == 0xd)
+			return 0;
 		return -EINVAL;
+	}
 	return 0;
 }