[Qemu-devel] [Bug 1213797] Re: Guest hang after live migration

[chao zhou]

The bug has been fixed by the following commit:

commit df67696e97d3edd0cb1683bf2eb3b3236bd9a5ed
Author: Liu Jinsong <address@hidden>
Date: Mon Aug 19 09:33:30 2013 +0800

    kvm: x86: fix setting IA32_FEATURE_CONTROL with nested VMX disabled

    This patch is to fix the bug https://bugs.launchpad.net/qemu-
kvm/+bug/120762

    IA32_FEATURE_CONTROL is pointless if not expose VMX or SMX bits to
    cpuid.1.ecx of vcpu. Current qemu-kvm will error return when kvm_put_msrs
    or kvm_get_msrs.

    Signed-off-by: Liu Jinsong <address@hidden>
    Signed-off-by: Paolo Bonzini <address@hidden>

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https://bugs.launchpad.net/bugs/1213797

Title:
  Guest hang after live migration

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:205befd9a5c701b56f569434045821f413f08f6d
  qemu-kvm uq/master Commit:ca916d3729564d0eb3c2374a96903f7e8aced8a7
  Host Kernel Version:3.11.0-rc1
  Hardware:Romley_EP, Ivytown_EP

  Bug detailed description:
  --------------------------
  after guest live migration, the guest will hang, and ping IP fail

  note:
  1. after guest save/restore, the guest will hang, and ping IP fail
  2. This should be a qemu-kvm bug.
  kvm      + qemu-kvm   =  result
  205befd9 + ca916d37   =  bad
  205befd9 + f03d07d4   =  good

  
  Reproduce steps:
  ----------------
  1.Start a TCP daemon for migration
  qemu-system-x86_64 -enable-kvm -m 2G -smp 2 -net nic,macaddr=00:12:34:56:13:45
  -net tap,script=/etc/kvm/qemu-ifup rhel6u2.qcow -incoming tcp:localhost:4444
  2. create guest
  qemu-system-x86_64 -enable-kvm -m 2G -smp 2 -net nic,macaddr=00:12:34:56:13:45
  -net tap,script=/etc/kvm/qemu-ifup rhel6u2.qcow 
  3. migrate tcp:localhost:4444

  Current result:
  ----------------
  guest hang

  Expected result:
  ----------------
  after live/migration or save/restore, the guest works fine

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