[Qemu-devel] [Bug 953754] Re: one of the two assi gned NICs doesn’t work in SMP guest.

[Yongjie Ren]

** Attachment added: "host dmesg log"
   
https://bugs.launchpad.net/qemu/+bug/953754/+attachment/2861051/+files/dmesg-host.log

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https://bugs.launchpad.net/bugs/953754

Title:
  one of the two assigned NICs doesn’t work in SMP guest.

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(RHEL6u1)
  kvm.git Commit:186195928e8149b27cdd603a660dace454969f2b
  qemu-kvm Commit: 81bdec908fb2be0ccaff1d4ee67956c509e440ad
  Host Kernel Version:3.3.0-rc5
  Hardware: Romley-EP, WSM-EP

  
  Bug detailed description:
  --------------------------
  SMP guest cannot get two IP addresses when assign two NICs with igb driver.
  I tried with Intel I350 and 82576 Ethernet Adapter.

  Note:
       1. when assign two NICs, both of the drivers are igb, the guest get only 
get one  IP.
       2. When assign two NICs, one driver is igb, another is ixgbe, the guest 
can get two IP address.
       3. UP guest can get two IP.
       4. smp guest, and assign two VFs with igb driver, the guest can get two 
IP
  addresses.

  This should be a qemu-kvm bug.
  kvm      + qemu-kvm   =  result
  18619592 + 81bdec90   =  bad 
  18619592 + b5ed4b6f   =  good

  Reproduce steps:
  ----------------
  1. start up a host with kvm kernel
  2. /root/pcistub.sh –h 08:00.0
  3. /root/pcistub.sh –h 0d:00.1
  4. qemu-system-x86_64 –m 512 –smp 2 –device pci-assign,host=0d:00.1
  –net none –device pci-assign,host=08:00.0 –net none –hda
  /root/rhel6u1.img
  5. ifconfig 

  
  Current result:
  ----------------
  Only one can work

  Expected result:
  ----------------
  Both NICs can work

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