Boot problems with qemu-kvm

Boot problems with qemu-kvm

[Cam Macdonell]

Hi,

I've tried booting two VMs (Ubuntu and Fedora 11) that previously worked 
with the latest kvm-userspace.  At start, I get the following warning:

Could not open '/dev/kqemu' - QEMU acceleration layer not activated: No 
such file or directory

But, booting proceeds quickly which seems to indicate that KVM is being 
used.  However, the network device is not started and the graphics don't 
start properly.  CPU usage also spikes to 100% and stays there and I 
can't interact at all with the VM.  I'm running the 2.6.29 KVM kernel in 
the guests.

Cam

Re: Boot problems with qemu-kvm

[Cam Macdonell]

Cam Macdonell wrote:
> 
> Hi,
> 
> I've tried booting two VMs (Ubuntu and Fedora 11) that previously worked 
> with the latest kvm-userspace.  At start, I get the following warning:
> 
> Could not open '/dev/kqemu' - QEMU acceleration layer not activated: No 
> such file or directory
> 
> But, booting proceeds quickly which seems to indicate that KVM is being 
> used.  However, the network device is not started and the graphics don't 
> start properly.  CPU usage also spikes to 100% and stays there and I 
> can't interact at all with the VM.  I'm running the 2.6.29 KVM kernel in 
> the guests.
> 
> Cam

As a simpler test, I tried booting the fedora 10 installer.  Similar to 
my existing VMs, it boots, but when it tries to launch the display, it 
hangs and 100% cpu usage occurs.  I tried with the std, vmware and 
cirrus vga adapters and the same thing happened each time.  Although 
with cirrus the CPU usage isn't as high, but it still hangs.

Cam

RE: Boot problems with qemu-kvm

[Xu, Jiajun]

On Tuesday, April 28, 2009 7:11 AM kvm-owner@vger.kernel.org wrote:

> Cam Macdonell wrote:
>> 
>> Hi,
>> 
>> I've tried booting two VMs (Ubuntu and Fedora 11) that previously
>> worked with the latest kvm-userspace.  At start, I get the following
>> warning: 
>> 
>> Could not open '/dev/kqemu' - QEMU acceleration layer not activated:
>> No such file or directory 
>> 
>> But, booting proceeds quickly which seems to indicate that KVM is
>> being used.  However, the network device is not started and the
>> graphics don't start properly.  CPU usage also spikes to 100% and
>> stays there and I can't interact at all with the VM.  I'm running
>> the 2.6.29 KVM kernel in the guests. 
>> 
>> Cam
> 
> As a simpler test, I tried booting the fedora 10 installer.
> Similar to
> my existing VMs, it boots, but when it tries to launch the display, it
> hangs and 100% cpu usage occurs.  I tried with the std, vmware and
> cirrus vga adapters and the same thing happened each time.  Although
> with cirrus the CPU usage isn't as high, but it still hangs.
> 
> Cam

I also met the same problem with 2.6.30-rc3. Guest can not get IP and qemu process cpu utilization is always ~100%.


Best Regards
Jiajun

Re: Boot problems with qemu-kvm

[Cam Macdonell]

Xu, Jiajun wrote:
> On Tuesday, April 28, 2009 7:11 AM kvm-owner@vger.kernel.org wrote:
> 
>> Cam Macdonell wrote:
>>> Hi,
>>>
>>> I've tried booting two VMs (Ubuntu and Fedora 11) that previously
>>> worked with the latest kvm-userspace.  At start, I get the following
>>> warning: 
>>>
>>> Could not open '/dev/kqemu' - QEMU acceleration layer not activated:
>>> No such file or directory 
>>>
>>> But, booting proceeds quickly which seems to indicate that KVM is
>>> being used.  However, the network device is not started and the
>>> graphics don't start properly.  CPU usage also spikes to 100% and
>>> stays there and I can't interact at all with the VM.  I'm running
>>> the 2.6.29 KVM kernel in the guests. 
>>>
>>> Cam
>> As a simpler test, I tried booting the fedora 10 installer.
>> Similar to
>> my existing VMs, it boots, but when it tries to launch the display, it
>> hangs and 100% cpu usage occurs.  I tried with the std, vmware and
>> cirrus vga adapters and the same thing happened each time.  Although
>> with cirrus the CPU usage isn't as high, but it still hangs.
>>
>> Cam
> 
> I also met the same problem with 2.6.30-rc3. Guest can not get IP and qemu process cpu utilization is always ~100%.
> 

Do you run a graphical display?

Re: Boot problems with qemu-kvm

[Cam Macdonell]

Xu, Jiajun wrote:
> On Tuesday, April 28, 2009 7:11 AM kvm-owner@vger.kernel.org wrote:
> 
>> Cam Macdonell wrote:
>>> Hi,
>>>
>>> I've tried booting two VMs (Ubuntu and Fedora 11) that previously
>>> worked with the latest kvm-userspace.  At start, I get the following
>>> warning: 
>>>
>>> Could not open '/dev/kqemu' - QEMU acceleration layer not activated:
>>> No such file or directory 
>>>
>>> But, booting proceeds quickly which seems to indicate that KVM is
>>> being used.  However, the network device is not started and the
>>> graphics don't start properly.  CPU usage also spikes to 100% and
>>> stays there and I can't interact at all with the VM.  I'm running
>>> the 2.6.29 KVM kernel in the guests. 
>>>
>>> Cam
>> As a simpler test, I tried booting the fedora 10 installer.
>> Similar to
>> my existing VMs, it boots, but when it tries to launch the display, it
>> hangs and 100% cpu usage occurs.  I tried with the std, vmware and
>> cirrus vga adapters and the same thing happened each time.  Although
>> with cirrus the CPU usage isn't as high, but it still hangs.
>>
>> Cam
> 
> I also met the same problem with 2.6.30-rc3. Guest can not get IP and qemu process cpu utilization is always ~100%.
> 

Well, I don't get the X display problem with -no-kvm.  It's only X 
that's the problem, terminal output and curses work.

As far as networking goes, I've had success getting the network up with 
VDE on one machine, but not with bridged networking.  Even running with 
-no-kvm doesn't help.  But, I have no problems with the lastest Qemu. 
So there's something in qemu-kvm that is causing the network problems 
that even -no-kvm doesn't fix.

Cam

RE: Boot problems with qemu-kvm

[Xu, Jiajun]

On Thursday, April 30, 2009 6:38 AM Cam Macdonell wrote:

>> I also met the same problem with 2.6.30-rc3. Guest can not
> get IP and qemu process cpu utilization is always ~100%.
>> 
> 
> Well, I don't get the X display problem with -no-kvm.  It's only X
> that's the problem, terminal output and curses work.
> 
> As far as networking goes, I've had success getting the
> network up with
> VDE on one machine, but not with bridged networking.  Even
> running with
> -no-kvm doesn't help.  But, I have no problems with the lastest Qemu.
> So there's something in qemu-kvm that is causing the network problems
> that even -no-kvm doesn't fix.

Yes. If booting guest with -no-kvm, X display can work well. And I am using bridge network, so still can not get network up. :(
And qemu cpu utilization is still ~100%.


Best Regards
Jiajun

Re: Boot problems with qemu-kvm

[Avi Kivity]

Xu, Jiajun wrote:
> Yes. If booting guest with -no-kvm, X display can work well. And I am using bridge network, so still can not get network up. :(
> And qemu cpu utilization is still ~100%.
>
>   

The last merge with qemu.git broke both vga and networking. Mark fixed 
networking, we're still looking at vga.

-- 
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