[Qemu-devel] [Bug 1364249] Re: guest can't get ip when create guest with bridge using virtio driver.

[chao zhou]

the first bad commit is
commit cc943c36faa192cd4b32af8fe5edb31894017d35
Author: Jan Kiszka <address@hidden>
Date:   Sun Jul 27 09:08:29 2014 +0200

    pci: Use bus master address space for delivering MSI/MSI-X messages

    The spec says (and real HW confirms this) that, if the bus master bit
    is 0, the device will not generate any PCI accesses. MSI and MSI-X
    messages fall among these, so we should use the corresponding address
    space to deliver them. This will prevent delivery if bus master support
    is disabled.

    Cc: address@hidden
    Signed-off-by: Jan Kiszka <address@hidden>
    Reviewed-by: Michael S. Tsirkin <address@hidden>
    Signed-off-by: Michael S. Tsirkin <address@hidden>

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https://bugs.launchpad.net/bugs/1364249

Title:
  guest can't get ip when create guest with bridge using virtio driver.

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):linux
  kvm.git Commit:c77dcacb397519b6ade8f08201a4a90a7f4f751e
  qemu.git Commit:f2c85a2f36f57f155cda7bc9f7c42b44f1a2439e
  Host Kernel Version:3.16.0
  Hardware:Ivytown_EP, Haswell_EP

  Bug detailed description:
  --------------------------
  when create guest with bridge, and the bridge network driver is virtio, the 
guest can not get ip.

  note: 
  1. this is a qemu bug:
  kvm      + qemu-kvm   =  result
  c77dcacb + f2c85a2f    =  bad 
  c77dcacb + 2d591ce2   =  good


  
  Reproduce steps:
  ----------------
  1. create guest:
  qemu-system-x86_64 -enable-kvm -m 2G -smp 4 -device 
virtio-net-pci,netdev=net0,mac=00:12:41:34:51:14 -netdev 
tap,id=net0,script=/etc/kvm/qemu-ifup rhel6u5.qcow

  Current result:
  ----------------
  guest can't get ip with bridge using virtio driver.

  Expected result:
  ----------------
  guest get ip with bridge using virtio driver.

  
  Basic root-causing log:
  ----------------------

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