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Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl


From: Jan Kiszka
Subject: Re: [Qemu-devel] Re: kvm crashes with spice while loading qxl
Date: Wed, 02 Mar 2011 09:22:35 +0100
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On 2011-03-01 13:58, Alon Levy wrote:
> On Sun, Feb 27, 2011 at 08:11:26PM +0100, Jan Kiszka wrote:
>> On 2011-02-27 20:03, Alon Levy wrote:
>>> On Sat, Feb 26, 2011 at 01:29:01PM +0100, Jan Kiszka wrote:
>>>> On 2011-02-26 12:43, xming wrote:
>>>>> When trying to start X (and it loads qxl driver) the kvm process just 
>>>>> crashes.
>>>
>>> This is fixed by Gerd's attached patch (taken from rhel repository, don't 
>>> know
>>> why it wasn't pushed to qemu-kvm upstream). I'll send it to kvm list as 
>>> well (separate email).
>>
>> Patch looks OK on first glance, but the changelog is misleading: This
>> was broken for _both_ trees, but upstream didn't detect the bug.
> 
> So I didn't test with qemu not having this patch, but according to the 
> discussion in the
> launchpad bug the problem only happens with qemu-kvm. This doesn't rule out 
> it being a
> bug, perhaps it is just triggered much less frequently I guess.

Again: qemu-kvm has the instrumentation to detect the bug, qemu is
lacking this, but both trees will break subtly if cpu_current_env is not
properly restored.

Jan

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