[PATCH v4 18/22] hmp: synchronize cpu state for lapic info

[Daniel P . Berrangé]

From: Dongli Zhang <dongli.zhang@oracle.com>

While the default "info lapic" always synchronizes cpu state ...

mon_get_cpu()
-> mon_get_cpu_sync(mon, true)
   -> cpu_synchronize_state(cpu)
      -> ioctl KVM_GET_LAPIC (taking KVM as example)

... the cpu state is not synchronized when the apic-id is available as
argument.

The cpu state should be synchronized when apic-id is available. Otherwise
the "info lapic <apic-id>" always returns stale data.

Cc: Joe Jin <joe.jin@oracle.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
---
 target/i386/monitor.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index 8e4b4d600c..fc375ced5a 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -29,6 +29,7 @@
 #include "monitor/hmp.h"
 #include "qapi/qmp/qdict.h"
 #include "qapi/qmp/qerror.h"
+#include "sysemu/hw_accel.h"
 #include "sysemu/kvm.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-misc-target.h"
@@ -655,7 +656,11 @@ void hmp_info_local_apic(Monitor *mon, const QDict *qdict)
 
     if (qdict_haskey(qdict, "apic-id")) {
         int id = qdict_get_try_int(qdict, "apic-id", 0);
+
         cs = cpu_by_arch_id(id);
+        if (cs) {
+            cpu_synchronize_state(cs);
+        }
     } else {
         cs = mon_get_cpu(mon);
     }
-- 
2.31.1