bios-tables-test: document expected file update

Document the flow for the case where contributor
updates the expected files.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

tests/qtest/bios-tables-test.c

@@ -16,7 +16,10 @@
  * 1. add empty files for new tables, if any, under tests/data/acpi
  * 2. list any changed files in tests/bios-tables-test-allowed-diff.h
  * 3. commit the above *before* making changes that affect the tables
- * Maintainer:
+ *
+ * Contributor or ACPI Maintainer (steps 4-7 need to be redone to resolve conflicts
+ * in binary commit created in step 6):
+ *
  * After 1-3 above tests will pass but ignore differences with the expected files.
  * You will also notice that tests/bios-tables-test-allowed-diff.h lists
  * a bunch of files. This is your hint that you need to do the below:
@@ -28,13 +31,23 @@
  * output. If not - disassemble them yourself in any way you like.
  * Look at the differences - make sure they make sense and match what the
  * changes you are merging are supposed to do.
+ * Save the changes, preferably in form of ASL diff for the commit log in
+ * step 6.
  *
  * 5. From build directory, run:
  *      $(SRC_PATH)/tests/data/acpi/rebuild-expected-aml.sh
- * 6. Now commit any changes.
- * 7. Before doing a pull request, make sure tests/bios-tables-test-allowed-diff.h
- *    is empty - this will ensure following changes to ACPI tables will
- *    be noticed.
+ * 6. Now commit any changes to the expected binary, include diff from step 4
+ *    in commit log.
+ * 7. Before sending patches to the list (Contributor)
+ *    or before doing a pull request (Maintainer), make sure
+ *    tests/bios-tables-test-allowed-diff.h is empty - this will ensure
+ *    following changes to ACPI tables will be noticed.
+ *
+ * The resulting patchset/pull request then looks like this:
+ * - patch 1: list changed files in tests/bios-tables-test-allowed-diff.h.
+ * - patches 2 - n: real changes, may contain multiple patches.
+ * - patch n + 1: update golden master binaries and empty
+ *   tests/bios-tables-test-allowed-diff.h
  */
 
 #include "qemu/osdep.h"