[Qemu-devel] [PATCH] cpu: skip unpluged cpu when querying cpus

[linzhecheng]

From: XuYandong <address@hidden>

After vcpu1 thread exiting, vcpu0 thread (received notification) is still 
waiting for
holding qemu_global_mutex in cpu_remove_sync, at this moment, vcpu1 is still in 
global cpus list.
If main thread grab qemu_global_mutex in order to handle qmp command "info 
cpus",
qmp_query_cpus visit unpluged vcpu1 will lead qemu process to exit.

Signed-off-by: XuYandong <address@hidden>
---
 cpus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cpus.c b/cpus.c
index 2cb0af9..9b3a6c4 100644
--- a/cpus.c
+++ b/cpus.c
@@ -2018,6 +2018,11 @@ CpuInfoList *qmp_query_cpus(Error **errp)
 
     CPU_FOREACH(cpu) {
         CpuInfoList *info;
+
+        if (cpu->unplug) {
+            continue;
+        }
+
 #if defined(TARGET_I386)
         X86CPU *x86_cpu = X86_CPU(cpu);
         CPUX86State *env = &x86_cpu->env;
-- 
1.8.3.1