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

[Alex Williamson]

There's not enough info here to even begin to debug this.  Intel doesn't
provide drivers for 82576 VF for most of the versions of Windows being
referenced.  No indication of what version of the driver is being using
for the NIC, no indication of what the Windows device manager reports
for the device, no qemu log messages or host log messages, etc... Why is
this a kernel bug vs a qemu bug?

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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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