From: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
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.
Reference:
https://lore.kernel.org/all/20211028155457.967291-19-berrange@xxxxxxxxxx/
Cc: Joe Jin <joe.jin@xxxxxxxxxx>
Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
Reviewed-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
Message-ID: <20231030085336.2681386-1-armbru@xxxxxxxxxx>
Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx>
Message-ID: <20231026211938.162815-1-dongli.zhang@xxxxxxxxxx>
Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
target/i386/monitor.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index 6512846327..950ff9ccbc 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -28,6 +28,7 @@
#include "monitor/hmp-target.h"
#include "monitor/hmp.h"
#include "qapi/qmp/qdict.h"
+#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-misc-target.h"
@@ -654,7 +655,11 @@ 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);
}
--
2.41.0
