[Qemu-devel] [Bug 877155] Re: VT-D NIC doesn't work in windows guest

[Yongjie Ren]

You can try to follow the reproduce steps described in bug description to 
reproduce this bug with the given commit of kvm.git
I think it's easy to reproduce.  For Intel NIC drivers in windows, you can 
download the appropriate driver you need via searching "Network Adapter Drivers 
for Windows" keywords in the following link. 
http://downloadcenter.intel.com/SearchResult.aspx?lang=eng
BTW, many Intel Ethernet Controllers use the same driver named 
"PROWinx64.exe"(64bit) or "PROWin32.exe"(32bit).
My driver for the assigned 82572 NIC for windows guest is the latest driver 
downloaded from the above website. Its version is 16.7.
I said it was a kernel bug because it doesn't work when using latest kvm with 
an older qemu-kvm (in July 2011) . The older qemu-kvm was proved to be a good 
version at that time with appropriate kvm. 
it's good with: kvm.git e62c2ef9  + qemu-kvm.git 525e3df7
it's bad with: kvm.git (latest)   + qemu-kvm.git 525e3df7

The phenomenon with the latest kvm upstream has some difference now. Now
VT-D/SR-IOV NIC in win2k8 guest works fine now, but VT-D/SR-IOV NIC in
win7 or winXP guest doesn't work. However, when I reported that bug,
VT-D/SR-IOV NIC didn't work in win2k8, win7 or winXP guest.

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https://bugs.launchpad.net/bugs/877155

Title:
  VT-D NIC doesn't work in windows guest

Status in QEMU:
  New

Bug description:
  [This should be a kvm kernel bug. I met this issue with quemu and kvm for 
virtualization. For https://bugzilla.kernel.org is not available yet, I just 
file this bug here just for tracking. ]
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):All
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):Linux
  kvm.git Commit:211978fb6c666f824ae8221baeaeeee7ee28efc1
  qemu.git Commit:edbb7c0de56692868e6126c7ff7e8bf917f8d0e7
  Host Kernel Version:3.1.0-rc9+
  Hardware: Westmere-EP && SandyBridge platform

  Bug detailed description:
  --------------------------
  Using qemu and kvm upstream, VT-D NIC and SR-IOV VF don't work in Windows 
guest.  I tried Windows XP, Vista, Win7, Win2k8 as a guest. And I used 82572 
NIC  and 82576 Virtual Function to assign to windows guest, and got the same 
result. 

  Reproduce steps:
  ----------------
  1.start a Windows guest with a NIC assigned: 
  qemu-system-x86_64 -m 1024 -smp 2 -device pci-assign,host=08:00.0 -net none 
-hda Windows.img
  2.check network in the Windows guest. (You'll find the assigned NIC doesn't 
work in guest.)

  Current result:
  ----------------
  NIC doesn't work in Windows guest

  Expected result:
  ----------------
  NIC will work.

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