[PATCH v2 10/21] tests/cpu-policy: add sorted MSR test

[Roger Pau Monne <roger.pau@citrix.com>]

Further changes will rely on MSR entries being sorted, so add a test
to assert it.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Changes since v1:
 - New in this version.
---
 tools/tests/cpu-policy/test-cpu-policy.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/tests/cpu-policy/test-cpu-policy.c b/tools/tests/cpu-policy/test-cpu-policy.c
index 0fa209f1ea7..ed450a09970 100644
--- a/tools/tests/cpu-policy/test-cpu-policy.c
+++ b/tools/tests/cpu-policy/test-cpu-policy.c
@@ -86,6 +86,16 @@ static bool leaves_are_sorted(const xen_cpuid_leaf_t *leaves, unsigned int nr)
     return true;
 }
 
+static bool msrs_are_sorted(const xen_msr_entry_t *entries, unsigned int nr)
+{
+    for ( unsigned int i = 1; i < nr; ++i )
+        /* MSR index went backwards => not sorted. */
+        if ( entries[i - 1].idx > entries[i].idx )
+            return false;
+
+    return true;
+}
+
 static void test_cpuid_current(void)
 {
     struct cpuid_policy p;
@@ -270,6 +280,13 @@ static void test_msr_serialise_success(void)
             goto test_done;
         }
 
+        if ( !msrs_are_sorted(msrs, nr) )
+        {
+            fail("  Test %s, MSR entries not sorted\n",
+                 t->name);
+            goto test_done;
+        }
+
     test_done:
         free(msrs);
     }
-- 
2.30.1