Re: [Xen-devel] [PATCH v11 01/17] libxl: fix stubdom console destruction

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Ian Campbell wrote:
> On Tue, 2012-07-24 at 11:54 +0100, Roger Pau Monne wrote:
>>>>> Does it apply to LIBXL__CONSOLE_BACKEND_IOEMU as well
>>>>> as ..._XENCONSOLED? I took a look through tools/console and I cannot
>>>>> find any handling of a state node in xenstore at all, so the XENCONSOLED
>>>>> case seems clear. I notice that xen_console.c registers the device with
>>>>> DEVOPS_FLAG_IGNORE_STATE but that only seems to affect startup not
>>>>> teardown. I don't see a qemu_chr_close (or anything similar) anywhere in
>>>>> hw/xen_console.c
>>>> So it should apply to any console device? This means I don't have to
>>>> wait for any device of type LIBXL__DEVICE_KIND_CONSOLE, and there's no
>>>> need to check for the specific console type or Qemu.
>>> xen_console registers a disconnect handler, con_disconnect, that should
>>> be able to unbind the evtchn and unmap the ring.
>>> "disconnect" is called by xen_backend, if the backend and frontend
>>> states are 5 or 6.
>> Yes, but I don't see that con_disconnect sets the state to 6 after doing
>> the cleanup, neither xenconsoled does so. I think con_disconnect should
>> set xendev->be_state = 6, so the parent function xen_be_disconnect would
>> notice the state change and write it to xenstore.
>>
> 
> The caller in xen_backend.c does this.

The caller is xen_be_disconnect, which doesn't seem to change the state,
and the caller of xen_be_disconnect is xen_be_check_state which also
doesn't seem to change the state.

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