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

From: Xuekun Hu
Subject: [Qemu-devel] [Bug 1013467] Re: network in bridge mode doesn't work in SMP Linux guest
Date: Mon, 25 Jun 2012 07:27:54 -0000

The regression is due to the patch of "rtl8139: do the network/host 
communication only in normal operating mode". (Commit

However after applying the patch, someone already reported this issue.
(http://comments.gmane.org/gmane.comp.emulators.qemu/150064). So
revertted this patch.

Not sure why this patch revert-revert again? So the bug happened again.

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  network in bridge mode doesn't work in SMP Linux guest

Status in QEMU:

Bug description:
  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  (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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