[xen staging] x86/nSVM: address Misra 2.1 rule violation

[patchbot@xxxxxxx]

commit 0c8460766af84978f93c4076144ef4b259e578fb
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Sep 11 08:54:53 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Sep 11 08:54:53 2026 +0200

    x86/nSVM: address Misra 2.1 rule violation
    
    The 16-bit range of "port" is fully handled by the switch(). Therefore the
    default: case is reported unreachable by Eclair. Insert BUILD_ERROR() to
    annotate this for Eclair.
    
    No functional change.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/svm/nestedsvm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c
index 5adb1bd72c..eec61238b5 100644
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -845,7 +845,7 @@ nsvm_vmcb_guest_intercepts_ioio(paddr_t iopm_pa, uint64_t 
exitinfo1)
         ++gfn;
         break;
     default:
-        BUG();
+        BUILD_ERROR("I/O port range not fully covered");
         break;
     }
 
--
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