Re: [Qemu-devel] [PATCH v7 00/10] qemu-ga: fsfreeze on Windows using VSS

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Tomoki Sekiyama (2013-07-15 11:20:23)
> Hi,
> 
> This is v7 of patch series to add fsfreeze for Windows qemu-guest-agent.
> 
> changes from v7:
>  - Fix COM initialization issue for Windows service thread (patch 07/10)
> 
> v6: http://lists.nongnu.org/archive/html/qemu-devel/2013-07/msg01788.html

Hi Tomoki,

I'm also having some issues testing this, though I think my problem is a little
different than the issue in v6:

When I initially ran qemu-ga -s install, I got some output indicating the VSS
service was registered, but then it hung. I noticed afterward that I'd already
had the service running, so figured that that might've been the problem. So I
stopped the service and unregistered it (using a qemu-ga install that was in
a separate directory).

Then I went back to install via qemu-ga.exe -s install, and it just hangs with
no output. I wasn't sure how to reset the state, so I took the Windows approach
and rebooted.

After reboot, running qemu-ga -s install gives me:

C:\Users\mdroth\Documents\qga>qemu-ga.exe -s install
Registering QEMU Guest Agent VSS Provider:
  C:\Users\mdroth\Documents\qga\qga-vss.dll
  C:\Users\mdroth\Documents\qga\qga-vss.tlb
Failed to pCatalog->InstallComponent. (Error: 8011045c) The application name is
not unique and cannot be resolved to an application id

CoCreateInstance. (Error: 80040154) Class not registered

Removing COM+ Application: QEMU Guest Agent VSS Provider
Removing COM+ Application: QEMU Guest Agent VSS Provider

[mdroth@vm5 ~]$

I'm not sure if I'm still in a bad state from earlier, but I can't seem to
recover from here.

If I try running qemu-ga -s uninstall, then qemu-ga -s install again, I get a
pop-up error saying:

"CoCreateInstance(VSSCoordinator) failed. (Error: 80040154) Class not registered

Any ideas what's going on here? I'm on a Windows 7 vm and built using a Fedora
18 mingw environment. Let me know if you need any additional information to
debug.

Thanks!

> 
> 
> * Description
>   In Windows, VSS (Volume Shadow Copy Service) provides a facility to
>   quiesce filesystems and applications before disk snapshots are taken.
>   This patch series implements "fsfreeze" command of qemu-ga using VSS.
> 
> 
> * How to build & run qemu-ga with VSS support
> 
>  - Download Microsoft VSS SDK from:
>    http://www.microsoft.com/en-us/download/details.aspx?id=23490
> 
>  - Setup the SDK
>    scripts/extract-vsssdk-headers setup.exe (on POSIX-systems)
> 
>  - Specify installed SDK directory to configure option as:
>    ./configure -with-vss-sdk="path/to/VSS SDK" --cross-prefix=i686-w64-mingw32-
> 
>  - make qemu-ga.exe qga/vss-win32/qga-vss.{dll,tlb}
> 
>  - Install qemu-ga.exe, qga/vss-win32/qga-vss.{dll,tlb}, and
>    the other required mingw libraries into the same directory in guests
> 
>  - Run `qemu-ga.exe -s install' and `net start qemu-ga' in the guests
> 
> Any feedback are appreciated.
> 
> ---
> Tomoki Sekiyama (10):
>       configure: Support configuring C++ compiler
>       Add c++ keywords to QAPI helper script
>       checkpatch.pl: Check .cpp files
>       Add a script to extract VSS SDK headers on POSIX system
>       qemu-ga: Add configure options to specify path to Windows/VSS SDK
>       error: Add error_set_win32 and error_setg_win32
>       qemu-ga: Add Windows VSS provider and requester as DLL
>       qemu-ga: Call Windows VSS requester in fsfreeze command handler
>       qemu-ga: Install Windows VSS provider on `qemu-ga -s install'
>       QMP/qemu-ga-client: Make timeout longer for guest-fsfreeze-freeze command
> 
> 
>  .gitignore                     |    1 
>  Makefile                       |    3 
>  Makefile.objs                  |    2 
>  QMP/qemu-ga-client             |    4 
>  configure                      |   87 +++++++
>  hmp.c                          |    2 
>  hw/pci/pci.c                   |    2 
>  include/qapi/error.h           |   13 +
>  qga/Makefile.objs              |    5 
>  qga/commands-win32.c           |   82 ++++++
>  qga/main.c                     |   10 +
>  qga/vss-win32.c                |  154 ++++++++++++
>  qga/vss-win32.h                |   27 ++
>  qga/vss-win32/Makefile.objs    |   23 ++
>  qga/vss-win32/install.cpp      |  424 +++++++++++++++++++++++++++++++++
>  qga/vss-win32/provider.cpp     |  513 ++++++++++++++++++++++++++++++++++++++++
>  qga/vss-win32/qga-vss.def      |   13 +
>  qga/vss-win32/qga-vss.idl      |   20 ++
>  qga/vss-win32/qga-vss.tlb      |  Bin
>  qga/vss-win32/requester.cpp    |  487 ++++++++++++++++++++++++++++++++++++++
>  qga/vss-win32/requester.h      |   42 +++
>  qga/vss-win32/vss-common.h     |  128 ++++++++++
>  rules.mak                      |    9 +
>  scripts/checkpatch.pl          |   37 ++-
>  scripts/extract-vsssdk-headers |   35 +++
>  scripts/qapi.py                |   12 +
>  util/error.c                   |   35 +++
>  27 files changed, 2146 insertions(+), 24 deletions(-)
>  create mode 100644 qga/vss-win32.c
>  create mode 100644 qga/vss-win32.h
>  create mode 100644 qga/vss-win32/Makefile.objs
>  create mode 100644 qga/vss-win32/install.cpp
>  create mode 100644 qga/vss-win32/provider.cpp
>  create mode 100644 qga/vss-win32/qga-vss.def
>  create mode 100644 qga/vss-win32/qga-vss.idl
>  create mode 100644 qga/vss-win32/qga-vss.tlb
>  create mode 100644 qga/vss-win32/requester.cpp
>  create mode 100644 qga/vss-win32/requester.h
>  create mode 100644 qga/vss-win32/vss-common.h
>  create mode 100755 scripts/extract-vsssdk-headers