[PATCH v2 21/21] tests/acceptance: add a new tests to detect counting errors

["Alex Bennée" <alex.bennee@linaro.org>]

The insn plugin has a simple heuristic to detect if an instruction is
detected running twice in a row. Check the plugin log after the run
and pass accordingly.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210209182749.31323-13-alex.bennee@linaro.org>
---
 tests/acceptance/tcg_plugins.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/tests/acceptance/tcg_plugins.py b/tests/acceptance/tcg_plugins.py
index b512979769..acab599505 100644
--- a/tests/acceptance/tcg_plugins.py
+++ b/tests/acceptance/tcg_plugins.py
@@ -101,3 +101,34 @@ class PluginKernelNormal(PluginKernelBase):
             else:
                 logger.debug("Failed to find instruction count")
                 self.fail
+
+    def test_aarch64_virt_insn_icount(self):
+        """
+        :avocado: tags=accel:tcg
+        :avocado: tags=arch:aarch64
+        :avocado: tags=machine:virt
+        :avocado: tags=cpu:cortex-a57
+        """
+        kernel_path = self._grab_aarch64_kernel()
+        kernel_command_line = (self.KERNEL_COMMON_COMMAND_LINE +
+                               'console=ttyAMA0')
+        console_pattern = 'Kernel panic - not syncing: VFS:'
+
+        plugin_log = tempfile.NamedTemporaryFile(mode="r+t", prefix="plugin",
+                                                 suffix=".log", delete=False)
+
+        self.run_vm(kernel_path, kernel_command_line,
+                    "tests/plugin/libinsn.so", plugin_log.name,
+                    console_pattern,
+                    args=('-cpu', 'cortex-a53', '-icount', 'shift=1'))
+
+        logger = logging.getLogger()
+
+        with plugin_log as lf, \
+             mmap.mmap(lf.fileno(), 0, access=mmap.ACCESS_READ) as s:
+            m = re.search(br"detected repeat execution @ (?P<addr>0x[0-9A-Fa-f]+)", s)
+            if m is not None and "addr" in m.groupdict():
+                logger.debug("detected repeat instructions")
+                self.fail("detected repeated instructions")
+            else:
+                logger.debug("no repeats detected: %s", m)
-- 
2.20.1