From: Avi Kivity <avi@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>
Subject: [Qemu-devel] Re: Bugs in kvm guest migration
Date: Fri, 04 Dec 2009 09:59:50 +0200 [thread overview]
Message-ID: <4B18C176.7050105@redhat.com> (raw)
In-Reply-To: <4B181033.1020804@siemens.com>
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?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2009-12-04 8:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-03 15:37 [Qemu-devel] Bugs in kvm guest migration Jan Kiszka
2009-12-03 19:23 ` [Qemu-devel] " Jan Kiszka
2009-12-04 7:59 ` Avi Kivity [this message]
2009-12-04 13:25 ` Jan Kiszka
2009-12-06 14:55 ` Jan Kiszka
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