Merge tag 'pull-maintainer-9.1-rc1-300724-1' of https://gitlab.com/stsquad/qemu into staging

Minor bug fixes and documentation cleanups:

  - display packages in CI builds to catch changes
  - stop compiler complaining about exec stacks in test cases
  - stop loongarch compiler complaining about rwx in test cases
  - improve docs on running TCG tests
  - remove old unneeded avocado test for memory callback testing
  - move test plugins into tcg testing dir
  - clean-up and move plugin documentation to emulation section
  - remove dead code from cache modelling plugin
  - add compatibility workaround for lockstep plugin
  - make some noise when building contrib plugins

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* tag 'pull-maintainer-9.1-rc1-300724-1' of https://gitlab.com/stsquad/qemu:
  plugin/loader: handle basic help query
  contrib/plugins: add compat for g_memdup2
  contrib/plugins: be more vocal building
  contrib/plugins/cache.c: Remove redundant check of l2_access
  docs: split TCG plugin usage from devel section
  tests/tcg: move test plugins into tcg subdir
  tests/avocado: remove tcg_plugins virt_mem_icount test
  docs/devel: document how to run individual TCG tests
  docs/devel: update the testing introduction
  tests/tcg: update README
  tests/tcg/loongarch64: Use --no-warn-rwx-segments to link system tests
  tests/tcg: Use --noexecstack with assembler files
  gitlab: display /packages.txt in build jobs
  gitlab: record installed packages in /packages.txt in containers

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/tcg/plugins/empty.c b/tests/tcg/plugins/empty.c
new file mode 100644
index 0000000000..8fa6bacd93
--- /dev/null
+++ b/tests/tcg/plugins/empty.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
+ *
+ * License: GNU GPL, version 2 or later.
+ *   See the COPYING file in the top-level directory.
+ */
+#include <inttypes.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include <qemu-plugin.h>
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
+/*
+ * Empty TB translation callback.
+ * This allows us to measure the overhead of injecting and then
+ * removing empty instrumentation.
+ */
+static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
+{ }
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
+                                           const qemu_info_t *info,
+                                           int argc, char **argv)
+{
+    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+    return 0;
+}