... to clarify to callers that they don't need to fear the pointed to
data changing (which will be made use of subsequently).

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2411,7 +2411,7 @@ int hvm_set_cr4(unsigned long value, boo
 
 bool_t hvm_virtual_to_linear_addr(
     enum x86_segment seg,
-    struct segment_register *reg,
+    const struct segment_register *reg,
     unsigned long offset,
     unsigned int bytes,
     enum hvm_access_type access_type,
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -469,7 +469,7 @@ enum hvm_access_type {
 };
 bool_t hvm_virtual_to_linear_addr(
     enum x86_segment seg,
-    struct segment_register *reg,
+    const struct segment_register *reg,
     unsigned long offset,
     unsigned int bytes,
     enum hvm_access_type access_type,