bql: add a "mock" BQL for Rust unit tests

Right now, the stub BQL in stubs/iothread-lock.c always reports itself as
unlocked.  However, Rust would like to run its tests in an environment where
the BQL *is* locked.  Provide an extremely dirty function that flips the
return value of bql_is_locked() to true.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/system/cpus.c b/system/cpus.c
index ba633c7688..4b43ceb543 100644
--- a/system/cpus.c
+++ b/system/cpus.c
@@ -538,6 +538,12 @@ bool qemu_in_main_thread(void)
     return bql_locked();
 }
 
+void rust_bql_mock_lock(void)
+{
+    error_report("This function should be used only from tests");
+    abort();
+}
+
 /*
  * The BQL is taken from so many places that it is worth profiling the
  * callers directly, instead of funneling them all through a single function.