On 5/7/25 11:12 PM, Alexandru Elisei wrote:
Document the environment variables that influence how a test is executed
by the run_tests.sh test runner.

Suggested-by: Andrew Jones <drjo...@redhat.com>
Reviewed-by: Andrew Jones <andrew.jo...@linux.dev>
Signed-off-by: Alexandru Elisei <alexandru.eli...@arm.com>

Reviewed-by: Shaoqin Huang <shahu...@redhat.com>

---
  docs/unittests.txt |  5 ++++-
  run_tests.sh       | 12 +++++++++---
  2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/docs/unittests.txt b/docs/unittests.txt
index 6eb315618dbd..ea0da959f008 100644
--- a/docs/unittests.txt
+++ b/docs/unittests.txt
@@ -102,7 +102,8 @@ timeout
  -------
  timeout = <duration>
-Optional timeout in seconds, after which the test will be killed and fail.
+Optional timeout in seconds, after which the test will be killed and fail. Can
+be overwritten with the TIMEOUT=<duration> environment variable.
check
  -----
@@ -113,3 +114,5 @@ can contain multiple files to check separated by a space, 
but each check
  parameter needs to be of the form <path>=<value>
The path and value cannot contain space, =, or shell wildcard characters.
+
+Can be overwritten with the CHECK environment variable with the same syntax.
diff --git a/run_tests.sh b/run_tests.sh
index f30b6dbd131c..dd9d27377905 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -27,9 +27,15 @@ Usage: $0 [-h] [-v] [-a] [-g group] [-j NUM-TASKS] [-t] [-l]
      -l, --list          Only output all tests list
          --probe-maxsmp  Update the maximum number of VCPUs supported by host
-Set the environment variable QEMU=/path/to/qemu-system-ARCH to
-specify the appropriate qemu binary for ARCH-run.
-
+The following environment variables are used:
+
+    QEMU            Path to QEMU binary for ARCH-run
+    ACCEL           QEMU accelerator to use, e.g. 'kvm', 'hvf' or 'tcg'
+    ACCEL_PROPS     Extra argument(s) to ACCEL
+    MACHINE         QEMU machine type
+    TIMEOUT         Timeout duration for the timeout(1) command
+    CHECK           Overwrites the 'check' unit test parameter (see
+                    docs/unittests.txt)
  EOF
  }

--
Shaoqin


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