aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorJan Kiszka <jan.kiszka@siemens.com>2011-02-01 22:15:43 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2011-02-14 12:39:44 -0200
commitb4a3d965dee06d52281496bb5fd0a5cb5534b545 (patch)
tree3d1c0bb7600ea91eea18e27530c3afa2ec41bbf7
parentaa2c364b4cf2fae4d9c8acf53ee4436ed533902d (diff)
downloadqemu-b4a3d965dee06d52281496bb5fd0a5cb5534b545.zip
qemu-b4a3d965dee06d52281496bb5fd0a5cb5534b545.tar.gz
qemu-b4a3d965dee06d52281496bb5fd0a5cb5534b545.tar.bz2
Stop current VCPU on synchronous reset requests
If some I/O operation ends up calling qemu_system_reset_request in VCPU context, we record this and inform the io-thread, but we do not terminate the VCPU loop. This can lead to fairly unexpected behavior if the triggering reset operation is supposed to work synchronously. Fix this for TCG (when run in deterministic I/O mode) by setting the VCPU on stop and issuing a cpu_exit. KVM requires some more work on its VCPU loop. [ ported from qemu-kvm ] Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
-rw-r--r--cpus.c17
-rw-r--r--cpus.h1
-rw-r--r--vl.c1
3 files changed, 15 insertions, 4 deletions
diff --git a/cpus.c b/cpus.c
index ab6e40e..f8a88e3 100644
--- a/cpus.c
+++ b/cpus.c
@@ -312,6 +312,10 @@ void qemu_notify_event(void)
void qemu_mutex_lock_iothread(void) {}
void qemu_mutex_unlock_iothread(void) {}
+void cpu_stop_current(void)
+{
+}
+
void vm_stop(int reason)
{
do_vm_stop(reason);
@@ -852,6 +856,14 @@ static void qemu_system_vmstop_request(int reason)
qemu_notify_event();
}
+void cpu_stop_current(void)
+{
+ if (cpu_single_env) {
+ cpu_single_env->stopped = 1;
+ cpu_exit(cpu_single_env);
+ }
+}
+
void vm_stop(int reason)
{
QemuThread me;
@@ -863,10 +875,7 @@ void vm_stop(int reason)
* FIXME: should not return to device code in case
* vm_stop() has been requested.
*/
- if (cpu_single_env) {
- cpu_exit(cpu_single_env);
- cpu_single_env->stop = 1;
- }
+ cpu_stop_current();
return;
}
do_vm_stop(reason);
diff --git a/cpus.h b/cpus.h
index bf4d9bb..4cadb64 100644
--- a/cpus.h
+++ b/cpus.h
@@ -6,6 +6,7 @@ int qemu_init_main_loop(void);
void qemu_main_loop_start(void);
void resume_all_vcpus(void);
void pause_all_vcpus(void);
+void cpu_stop_current(void);
/* vl.c */
extern int smp_cores;
diff --git a/vl.c b/vl.c
index ed2cdfa..5e3f7f2 100644
--- a/vl.c
+++ b/vl.c
@@ -1296,6 +1296,7 @@ void qemu_system_reset_request(void)
} else {
reset_requested = 1;
}
+ cpu_stop_current();
qemu_notify_event();
}