[Xen-devel] [PATCH] xen/public: arch-arm: Restrict the visibility of struct vcpu_guest_core_regs

[Julien Grall <julien.grall@xxxxxxx>]

Currently, the structure vcpu_guest_core_regs is part of the public API.
This implies that any change in the structure should be backward
compatible.

However, the structure is only needed by the tools and Xen. It is also
not expected to be ever used outside of that context. So we could save us
some headache by only declaring the structure for Xen and tools.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

---
    This is a follow-up of the discussion [1].

    As this is now Xen and tools only, I am wondering whether the check on
    GNU_C is still necessary. I am happy to send a follow-up patch (or fold
    in this one) if it can be removed.

    [1] <3c245c5b-51c6-1d0e-ad6c-42414573166f@xxxxxxx>
---
 xen/include/public/arch-arm.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index eb424e8286..e9a86d8eb8 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -197,6 +197,7 @@
     } while ( 0 )
 #define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
 
+#if defined(__XEN__) || defined(__XEN_TOOLS__)
 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
 /* Anonymous union includes both 32- and 64-bit names (e.g., r0/x0). */
 # define __DECL_REG(n64, n32) union {          \
@@ -272,6 +273,8 @@ DEFINE_XEN_GUEST_HANDLE(vcpu_guest_core_regs_t);
 
 #undef __DECL_REG
 
+#endif
+
 typedef uint64_t xen_pfn_t;
 #define PRI_xen_pfn PRIx64
 #define PRIu_xen_pfn PRIu64
-- 
2.11.0


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