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Re: [Qemu-discuss] [libvirt] Where to get precompiled qga-vss.dll from ?


From: Tomoki Sekiyama
Subject: Re: [Qemu-discuss] [libvirt] Where to get precompiled qga-vss.dll from ?
Date: Tue, 8 Jul 2014 19:46:09 +0000

‚Äč
>Hi,
>
>[Rephrasing my earlier post with more clarity.]
>
>I need to work with "guest-fsfreeze-*" commands in Windows 2008 guest VM
>(Host is CentOS 6.4) to quisce the applications.
>
>
>
>Windows 2008 Guest Machine

Is this 32bit or 64bit? FYI, qga-vss.dll must be built for corresponding
architecture because it is loaded by the system. (32bit qemu-ga.exe itself
can run on both architectures, but cannot load 64bit qga-vss.dll.)

>
>    1. Windows 2008 is running following services
>
>        - QEMU Guest Agent
>
>        - QEMU Guest Agent VSS Provider

It looks odd because this service requires qga-vss.dll to be installed.

>
>    2. C:\> vssadmin list providers
>          ...
>
>          Provider name: 'QEMU Guest Agent VSS Provider
>
>               ....
>
>               Version: 0.12.1

Officially fsfreeze using VSS is merged on qemu 1.7, but it seems older.
Maybe back-ported from upstream? Where did you get this qemu-ga.exe binary?

>
>          Provider name: 'Microsoft Software Shadow Copy provider 1.0'
>                ....
>
>                Version: 1.0.0.7
>
>
>
>
>Host (CentOS 6.4)
>   
>
>    When "guest-fsfreeze-*" commands are invoked from host, response
>received from guest is "This is not supported". Since "QEMU Guest Agent
>VSS Provider" was already running in Guest VM,
> I was expecting these commands to succeed and quisce  Windows
>applications, but they were reported as unsupported.
>
>address@hidden Downloads]# virsh qemu-agent-command vm_win_06 '{
>"execute": "guest-fsfreeze-status"}'
>{"error":{"class":"Unsupported","desc":"this feature or command is not
>currently supported","data":{}}}
>
>address@hidden Downloads]# virsh qemu-agent-command vm_win_06 '{
>"execute": "guest-fsfreeze-freeze"}'
>{"error":{"class":"Unsupported","desc":"this feature or command is not
>currently supported","data":{}}}
>
>
>Is missing qga-vss.dll the reason?
>
>
>I searched my system for this dll and could not find it and suspected
>that missing qga-vss.dll is the reason for this. I took suggestions from
>following post which advised to cross-compile
> qemu code to get qga-vss.dll
>
>
>http://lists.gnu.org/archive/html/qemu-devel/2013-02/msg01963.html.
>
>
>
>But I faced a lot of issues while building i686-w64-mingw32-* in CentOS
>6.4 and had to eventually give up building i686-w64-mingw32-* and move to
>getting pre-compiled QEMU guest agent (with VSS support), which I can
>install on Windows to quisce the applications.

Fedora 20 has all required mingw64 packages to build qemu-ga so you just
need something like:

 # yum install 
mingw64-{gcc-c++,gettext,glib2,pixman,pkg-config,termcap,win-iconv,zlib}
           (or mingw32 for 32bit)

to build the cross compile environment.

>What I need
>
>
>If I can get pre-compiled qga-vss.dll, I can copy it to Windows8 guest VM
>and hopefully work with guest-fsfreeze-* commands to quisce the
>applications.
>
>
>Can somebody point me to pre-compiled QEMU guest agent with VSS support
>(and qga-vss.dll) so that I can quisce the Windows guest VM applications?
>
>
>Regards,
>
>~Puneet
>
>
>
>
>On Tue, Jul 8, 2014 at 3:27 AM, Eric Blake
><address@hidden> wrote:
>
>On 07/07/2014 02:32 AM, Puneet Bakshi wrote:
>> Hi,
>>
>> I want to work with "guest-fsfreeze-*" commands in Windows 2008 guest
>>VM.
>> Host is CentOS 6.4.
>>
>> Windows 2008 is running QEMU VSS provider. When "guest-fsfreeze-*"
>>commands
>> are invoked from host, response received is "This is not supported".
>>
>> I am following
>> 
>http://lists.gnu.org/archive/html/qemu-devel/2013-02/msg01963.html
><http://lists.gnu.org/archive/html/qemu-devel/2013-02/msg01963.html>.
>
>
>
>The libvirt list is the wrong place to be asking this question; qemu is
>better.
>
>The spice-devel list has done some pre-packaged virt stack builds for
>Windows; maybe they might be a better resource to ask (for example, see
>http://lists.freedesktop.org/archives/spice-devel/2014-February/016100.htm
>l)
>- but I don't follow that list closely enough to know if they have
>pre-built qga.
>
>You could always download the mingw cross-compiler and try to build qga
>yourself, instead of relying on someone else to provide a pre-built
>binary.
>
>--
>Eric Blake   eblake redhat com    +1-919-301-3266 <tel:%2B1-919-301-3266>
>Libvirt virtualization library http://libvirt.org
>
>
>
>


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