Re: [Xen-devel] [PATCH 1/2] qem-xen: add later wakeup logic when qemu wakeup

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Anthony PERARD wrote:
> On 01/09/13 10:51, Liu, Jinsong wrote:
>> From 86ad3bb83a984ad7bbc00b81d6a0bfc1abc543ca Mon Sep 17 00:00:00
>> 2001 
>> From: Liu Jinsong <jinsong.liu@xxxxxxxxx>
>> Date: Sun, 1 Sep 2013 23:39:14 +0800
>> Subject: [PATCH 1/2] qemu-xen: add later wakeup logic when qemu
>> wakeup 
>> 
>> Currently HVM S3 has a bug coming from the difference between
>> qemu-traditioanl and qemu-xen. For qemu-traditional, the way
>> to resume from hvm s3 is via 'xl trigger' command. However,
>> for qemu-xen, the way to resume from hvm s3 inherited from
>> standard qemu, i.e. via QMP, and it doesn't work under Xen.
>> 
>> The root cause is, for qemu-xen, 'xl trigger' command didn't reset
>> devices, while QMP didn't unpause hvm domain though they did qemu
>> system reset.
>> 
>> We have two qemu-xen patches and one xl patch to fix the HVM S3 bug.
>> This patch is the qemu-xen patch 1. It provides a later wakeup
>> notifier 
>> and a register function, and notifies the later wakeup list when
>> qemu wakup by 'xl trigger' command.
>> 
>> Signed-off-by: Liu Jinsong <jinsong.liu@xxxxxxxxx>
>> ---
>>  sysemu.h |    1 +
>>  vl.c     |    8 ++++++++
>>  2 files changed, 9 insertions(+), 0 deletions(-)
>> 
>> diff --git a/sysemu.h b/sysemu.h
>> index b71f244..4dbcab7 100644
>> --- a/sysemu.h
>> +++ b/sysemu.h
>> @@ -49,6 +49,7 @@ void qemu_register_suspend_notifier(Notifier
>>  *notifier); void qemu_system_wakeup_request(WakeupReason reason);
>>  void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
>>  void qemu_register_wakeup_notifier(Notifier *notifier);
>> +void qemu_register_later_wakeup_notifier(Notifier *notifier);
>>  void qemu_system_shutdown_request(void);
>>  void qemu_system_powerdown_request(void);
>>  void qemu_register_powerdown_notifier(Notifier *notifier);
>> diff --git a/vl.c b/vl.c
>> index 5314f55..1c4842d 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -1478,6 +1478,8 @@ static NotifierList suspend_notifiers =
>>      NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
>>  static NotifierList wakeup_notifiers =
>>      NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
>> +static NotifierList later_wakeup_notifiers =
>> +    NOTIFIER_LIST_INITIALIZER(later_wakeup_notifiers);
>>  static uint32_t wakeup_reason_mask = ~0;
>>  static RunState vmstop_requested = RUN_STATE_MAX;
>> 
>> @@ -1668,6 +1670,11 @@ void qemu_register_wakeup_notifier(Notifier
>>      *notifier) notifier_list_add(&wakeup_notifiers, notifier);  }
>> 
>> +void qemu_register_later_wakeup_notifier(Notifier *notifier) +{
>> +    notifier_list_add(&later_wakeup_notifiers, notifier); +}
>> +
>>  void qemu_system_killed(int signal, pid_t pid)
>>  {
>>      shutdown_signal = signal;
>> @@ -1744,6 +1751,7 @@ static bool main_loop_should_exit(void)
>>          cpu_synchronize_all_states();
>>          qemu_system_reset(VMRESET_SILENT);
>>          resume_all_vcpus();
>> +        notifier_list_notify(&later_wakeup_notifiers, NULL);
>>          monitor_protocol_event(QEVENT_WAKEUP, NULL);      }
>>      if (qemu_powerdown_requested()) {
>> 
> 
> The patch those not apply properly to QEMU (upstream) but it just
> because the file sysemu.h have been moved to include/sysemu/sysemu.h
> 
> Once this is fix:
> Acked-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Yes. The patches are for qemu-xen tree, to fix xen hvm s3 issue.

Where should the 2 patches be checked in? qemu upstream (then backport to 
qemu-xen tree), or, qemu-xen tree?

Thanks,
Jinsong

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