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move vm_start to cpus.c

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This patch:

* moves vm_start to cpus.c.
* exports qemu_vmstop_requested, since it's needed by vm_start.
* extracts vm_prepare_start from vm_start; it does what vm_start did,
  except restarting the cpus.
* vm_start now calls vm_prepare_start and then restarts the cpus.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Message-Id: <1487092068-16562-2-git-send-email-imbrenda@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Claudio Imbrenda 2017-02-14 18:07:47 +01:00 committed by Paolo Bonzini
parent 1c64fdbc81
commit 2d76e82395
3 changed files with 45 additions and 29 deletions
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42
cpus.c
View File

@ -1578,6 +1578,48 @@ int vm_stop(RunState state)
return do_vm_stop(state);
}
/**
* Prepare for (re)starting the VM.
* Returns -1 if the vCPUs are not to be restarted (e.g. if they are already
* running or in case of an error condition), 0 otherwise.
*/
int vm_prepare_start(void)
{
RunState requested;
int res = 0;
qemu_vmstop_requested(&requested);
if (runstate_is_running() && requested == RUN_STATE__MAX) {
return -1;
}
/* Ensure that a STOP/RESUME pair of events is emitted if a
* vmstop request was pending. The BLOCK_IO_ERROR event, for
* example, according to documentation is always followed by
* the STOP event.
*/
if (runstate_is_running()) {
qapi_event_send_stop(&error_abort);
res = -1;
} else {
replay_enable_events();
cpu_enable_ticks();
runstate_set(RUN_STATE_RUNNING);
vm_state_notify(1, RUN_STATE_RUNNING);
}
/* We are sending this now, but the CPUs will be resumed shortly later */
qapi_event_send_resume(&error_abort);
return res;
}
void vm_start(void)
{
if (!vm_prepare_start()) {
resume_all_vcpus();
}
}
/* does a state transition even if the VM is already stopped,
current state is forgotten forever */
int vm_stop_force_state(RunState state)

2
include/sysemu/sysemu.h
View File

@ -37,6 +37,7 @@ void vm_state_notify(int running, RunState state);
#define VMRESET_REPORT true
void vm_start(void);
int vm_prepare_start(void);
int vm_stop(RunState state);
int vm_stop_force_state(RunState state);
@ -60,6 +61,7 @@ void qemu_register_powerdown_notifier(Notifier *notifier);
void qemu_system_debug_request(void);
void qemu_system_vmstop_request(RunState reason);
void qemu_system_vmstop_request_prepare(void);
bool qemu_vmstop_requested(RunState *r);
int qemu_shutdown_requested_get(void);
int qemu_reset_requested_get(void);
void qemu_system_killed(int signal, pid_t pid);

30
vl.c
View File

@ -724,7 +724,7 @@ StatusInfo *qmp_query_status(Error **errp)
return info;
}
static bool qemu_vmstop_requested(RunState *r)
bool qemu_vmstop_requested(RunState *r)
{
qemu_mutex_lock(&vmstop_lock);
*r = vmstop_requested;
@ -745,34 +745,6 @@ void qemu_system_vmstop_request(RunState state)
qemu_notify_event();
}
void vm_start(void)
{
RunState requested;
qemu_vmstop_requested(&requested);
if (runstate_is_running() && requested == RUN_STATE__MAX) {
return;
}
/* Ensure that a STOP/RESUME pair of events is emitted if a
* vmstop request was pending. The BLOCK_IO_ERROR event, for
* example, according to documentation is always followed by
* the STOP event.
*/
if (runstate_is_running()) {
qapi_event_send_stop(&error_abort);
} else {
replay_enable_events();
cpu_enable_ticks();
runstate_set(RUN_STATE_RUNNING);
vm_state_notify(1, RUN_STATE_RUNNING);
resume_all_vcpus();
}
qapi_event_send_resume(&error_abort);
}
/***********************************************************/
/* real time host monotonic timer */