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[v2,07/10] accel/tcg: Simplify use of &first_cpu in rr_cpu_thread_fn()

Message ID 20250207162048.1890669-8-imammedo@redhat.com (mailing list archive)
State New
Headers show
Series accel: Only include qdev-realized vCPUs in global &cpus_queue | expand

Commit Message

Igor Mammedov Feb. 7, 2025, 4:20 p.m. UTC 
From: Philippe Mathieu-Daudé <philmd@linaro.org>

Let vCPUs wait for themselves being ready first, then other ones.
This allows the first thread to starts without the global vcpu
queue (thus &first_cpu) being populated.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 accel/tcg/tcg-accel-ops-rr.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)
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Patch

diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index 028b385af9..d9eadd5ec4 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -197,16 +197,19 @@  static void *rr_cpu_thread_fn(void *arg)
     qemu_guest_random_seed_thread_part2(cpu->random_seed);
 
     /* wait for initial kick-off after machine start */
-    while (first_cpu->stopped) {
-        qemu_cond_wait_bql(first_cpu->halt_cond);
+    while (cpu->stopped) {
+        CPUState *iter_cpu;
+
+        qemu_cond_wait_bql(cpu->halt_cond);
 
         /* process any pending work */
-        CPU_FOREACH(cpu) {
-            current_cpu = cpu;
-            qemu_wait_io_event_common(cpu);
+        CPU_FOREACH(iter_cpu) {
+            current_cpu = iter_cpu;
+            qemu_wait_io_event_common(iter_cpu);
         }
     }
 
+    g_assert(first_cpu);
     rr_start_kick_timer();
 
     cpu = first_cpu;