[Qemu-devel] [Bug 1013467] Re: network in bridge mode doesn't work in SMP Linux guest

[Yongjie Ren]

** Attachment added: "lspci -vvv in guest"
   
https://bugs.launchpad.net/qemu/+bug/1013467/+attachment/3190180/+files/lspci-guest.log

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https://bugs.launchpad.net/bugs/1013467

Title:
  network in bridge mode doesn't work in SMP Linux 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
  kvm.git Commit:25e531a988ea5a64bd97a72dc9d3c65ad5850120
  qemu-kvm Commit:0a948cbb1835e5f36990e173966d30bc4c8cc038
  Host Kernel Version:3.5.0-rc1
  Hardware:WSM-EP, Romley-EP

  
  Bug detailed description:
  --------------------------
  Network in bridge mode doesn't work in SMP RHEL6.1/6.2 guest.
  After booting up, use “dhclient ethX” to get IP (we use DHCP in the network), 
guest can not get IP.
  Note:  1. UP guest(-smp 1) doesn’t have this issue.
               2. Windows(e.g. Win7) guest(-smp 4) has no issue.

  This should be a qemu-kvm bug.
  kvm      + qemu-kvm   =  result
  25e531a9 + 0a948cbb    =  bad 
  25e531a9 + 18b01275   =  good

  
  Reproduce steps:
  ----------------
  1.start up a host with kvm(25e531a9) + qemu-kvm (0a948cbb)
  2.qemu-system-x86_64 -m 1024 -smp 4 –net nic,model=rt18139 –net 
tap,script=/etc/kvm/qemu-ifup –hda /root/rhel6u1.qcow
  3. ifconfig
  4. ping 192.168.199.98  (a IP in the same subnet)
  5. dhclient ethx   (can't get dynamic IP address)

  
  Current result:
  ----------------
  The guest can not get IP

  Expected result:
  ----------------
  The guest get IP and work fine.

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