Re: [Qemu-devel] Re: [PATCH 0/2] v8 Decouple block device removal from device removal

[Kevin Wolf <kwolf@redhat.com>]

Am 16.11.2010 14:51, schrieb Luiz Capitulino:
> On Fri, 12 Nov 2010 18:38:57 +0100
> Kevin Wolf <kwolf@redhat.com> wrote:
> 
>> Am 12.11.2010 18:07, schrieb Ryan Harper:
>>> details, details, v8
>>>
>>> This patch series decouples the detachment of a block device from the
>>> removal of the backing pci-device.  Removal of a hotplugged pci device
>>> requires the guest to respond before qemu tears down the block device.
>>> In some cases, the guest may not respond leaving the guest with
>>> continued access to the block device.  Mgmt layer doesn't have a
>>> reliable method to force a disconnect.  
>>>
>>> The new monitor command, drive_del, will revoke a guests access to the
>>> block device independently of the removal of the pci device.
>>>
>>> The first patch implements drive_del, the second patch implements the
>>> qmp version of the monitor command.
>>>
>>> Changes since v7:
>>> - Fixed up doc strings (delete -> drive_del)
>>> Changes since v6:
>>> - Updated patch description
>>> - Dropped bdrv_unplug and inlined in drive_del
>>> - Explicitly invoke drive_uninit()
>>> Changes since v5:
>>> - Removed dangling pointers in guest and host state.  This ensures things like 
>>>   info block no longer displays the deleted drive; though info pci will
>>>   continue to display the pci device until the guest responds to the removal
>>>   request.
>>> - Renamed drive_unplug -> drive_del
>>> Changes since v4:
>>> - Droppped drive_get_by_id patch and use bdrv_find() instead
>>> - Added additional details about drive_unplug to hmp/qmp interface
>>>
>>> Changes since v3:
>>> - Moved QMP command for drive_unplug() to separate patch
>>>
>>> Changes since v2:
>>> - Added QMP command for drive_unplug()
>>>
>>> Changes since v1:
>>> - CodingStyle fixes
>>> - Added qemu_aio_flush() to bdrv_unplug()
>>>
>>> Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
>>
>> Thanks, applied both to the block branch.
> 
> I guess the conclusion was that we don't want the new command
> in QMP?
> 
>   http://lists.gnu.org/archive/html/qemu-devel/2010-11/msg01084.html

If you compare the time of these mails, Markus sent his mail only a few
minutes after I had applied the patches and posted this.

Ryan split the patch in two parts only to allow dropping the QMP part if
we decided so, so I think he'll agree. I'm going to drop the second
patch from my queue again before I send a pull request.

Kevin