Re: Live migration of x86-64 kvm guests broken?

Jan Kiszka
2009-12-02T18:05:54Z

Ryan Harper wrote:
> * Jan Kiszka <jan.kiszka@siemens.com> [2009-12-02 09:28]:
>> Hi,
>>
>> I'm facing stalled x86-64 guests after live migration when using kvm
>> (share disk images). This does not happen with x86-32 guests or when
>> disabling kvm. Both qemu and qemu-kvm git heads are affected (recent
>> vmstate fixes applied). Running I/O load during the migration (e.g. a
>> simple "ls -R /") seems to trigger it reliably.
>>
>> Can anyone confirm / comment on this? Do we fail to restore some magic
>> state that only long mode cares about?
>
> Just tested upstream qemu.git (with vmstate fixes) and I could migrate
> RHEL 5.3 64-bit guest with your light io load over localhost. I'll try
> remote hosts next.

Hell, too many variables. It looks like the kernel modules have some if
not the ultimate impact: kvm-mod-2.6.31.6b on my 2.6.27 host works fine,
kvm-kmod stable-2.6.32 as well as master cause troubles.

What is your host kernel and/or kvm module version?

Jan

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