[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Re: Bugs in kvm guest migration
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: Bugs in kvm guest migration |
Date: |
Sun, 06 Dec 2009 15:55:32 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
Jan Kiszka wrote:
> Avi Kivity wrote:
>> On 12/03/2009 09:23 PM, Jan Kiszka wrote:
>>> Jan Kiszka wrote:
>>>
>>>> Problem 2
>>>> ---------
>>>> Setup: qemu head with vmstate fixes. kvm-kmod master, 64-bit host& guest.
>>>> Effect: The migration target either locks up or reboots immediately.
>>>> I've nailed this down to 84d0b66c778d881eafca2a5d0d66678211c4e861. Every
>>>> kvm module build before that works, everything including and after
>>>> 26ede77f536d1bb369527a96c7fe7fdc8ba2f890 shows the effect (everything in
>>>> between crashes the host for known reasons). It's still unclear if this
>>>> is an kvm-kmod wrapping issue of the user-space return notifiers. Will
>>>> check once problem #1 is understood.
>>>>
>>> It is kernel-related, using kvm.git as host kernel makes no difference.
>>>
>>> This may now mean that kvm is buggy or that it triggers some msr
>>> save/restore related issues in qemu. Digging even deeper...
>>>
>> Does calling drop_user_return_notifiers() (static in x86.c, will need
>> exporting) in vmx_load_host_state() within the preempt-disable region help?
>>
>
> Nope.
>
It was a qemu bug, resolved by "KVM: x86: Fix initial kvm_has_msr_star".
Jan
signature.asc
Description: OpenPGP digital signature