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[Qemu-devel] [Bug 830558] Re: VF doesn't work in guest when not pinned w


From: Yongjie Ren
Subject: [Qemu-devel] [Bug 830558] Re: VF doesn't work in guest when not pinned with "addr="
Date: Mon, 22 Aug 2011 12:25:21 -0000

** Project changed: qemu-kvm => qemu

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https://bugs.launchpad.net/bugs/830558

Title:
  VF doesn't work in guest when not pinned with "addr="

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):All
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):Linux (rhel6 and rhel5u5)
  kvm.git Commit:ef7c782ea4a99fafb3d60dc8b8c057e0ef14f9f7
  qemu-kvm Commit:44755ea36fee3f0b1093ef27404def8857602274
  Host Kernel Version:3.0.0+
  Hardware: Westmere-EP platform

  Bug detailed description:
  --------------------------
  SR-IOV VF NIC doesn't work in guest when not pinned pci address with 
"addr=x05". Guest's dmesg shows "Failed to initialize MSI-X interrupts."  If 
not pinned an address with "addr=0x05", the VF will be pinned to "0000:00:03.0" 
by default, and that doesn't work.
  Normal vtd NIC assignment doesn't have this issue.
  commit:fda19064e  of qemu-kvm.git is good.
  commit:44755ea36 of qemu-kvm.git is bad with this issue.
  There maybe something wrong between the two commit.
  Here's some dmesg info in the guest.
  ----dmesg in guest------
  Intel(R) Virtual Function Network Driver - version 1.0.0-k0
  Copyright (c) 2009 Intel Corporation.
  igbvf 0000:00:03.0: setting latency timer to 64
  igbvf 0000:00:03.0: Failed to initialize MSI-X interrupts.
  igbvf 0000:00:03.0: Intel(R) 82576 Virtual Function
  igbvf 0000:00:03.0: Address: da:66:bb:e6:1e:f4
  igbvf 0000:00:03.0: MAC: 1
  ....
  igbvf 0000:00:03.0: Unable to allocate interrupt, Error: -1
  ....

  Reproduce steps:
  ----------------
  1.pci-stub the a VF in 82576 NIC
  2.create a guest: qemu-system-x86_64 -m 1024 -smp 2 -device 
pci-assign,host=01:10.0 -net none -hda /root/rhel6.qcow
  (if using '-device pci-assign,host=01:10.0,addr=0x5, the VF will work)
  3.check network in guest

  Current result:
  ----------------
  VF doesn't work in guest.

  Expected result:
  ----------------
  VF works well in guest.

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