[PATCH v4 11/13] accel/tcg: Add rr_destroy_vcpu_thread_precheck()

["Philippe Mathieu-Daudé" <philippe.mathieu.daude@gmail.com>]

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

TCG/RR is special and creates a single vCPU. It only have
to release its resources once. Implement the .precheck()
for that purpose.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 accel/tcg/tcg-accel-ops-rr.c | 9 +++++++++
 accel/tcg/tcg-accel-ops.c    | 1 +
 2 files changed, 10 insertions(+)

diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index 006b787289..6fe8e20356 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -295,3 +295,12 @@ void rr_create_vcpu_thread_postcheck(CPUState *cpu)
         cpu->created = true;
     }
 }
+
+bool rr_destroy_vcpu_thread_precheck(CPUState *cpu)
+{
+    if (single_tcg_cpu_thread) {
+        single_tcg_cpu_thread = NULL;
+        return true;
+    }
+    return false;
+}
diff --git a/accel/tcg/tcg-accel-ops.c b/accel/tcg/tcg-accel-ops.c
index 127dd6fee5..0b0dbcc47a 100644
--- a/accel/tcg/tcg-accel-ops.c
+++ b/accel/tcg/tcg-accel-ops.c
@@ -102,6 +102,7 @@ static void tcg_accel_ops_init(AccelOpsClass *ops)
         ops->vcpu_thread_fn = rr_vcpu_thread_fn;
         ops->create_vcpu_thread_precheck = rr_create_vcpu_thread_precheck;
         ops->create_vcpu_thread_postcheck = rr_create_vcpu_thread_postcheck;
+        ops->destroy_vcpu_thread_precheck = rr_destroy_vcpu_thread_precheck;
         ops->kick_vcpu_thread = rr_kick_vcpu_thread;
 
         if (icount_enabled()) {
-- 
2.35.1