[libvirt] How does libvirt 0.6.3 load kvm driver
Jason Wong
hcwong at clustertech.com
Tue Jun 30 11:03:48 UTC 2009
Daniel P. Berrange wrote:
> On Tue, Jun 30, 2009 at 06:38:35PM +0800, Jason Wong wrote:
>
>> Daniel P. Berrange wrote:
>>
>>> On Tue, Jun 30, 2009 at 01:59:36PM +0800, Jason Wong wrote:
>>>
>>>
>> Let me clarify, the KVM qemu driver, in my understanding is the part
>> that responsible for the communication between KVM hypervisor and
>> libvirt (I think it is in the source code qemu_driver.c).
>> For KVM kernel module, I have manually use "modprobe kvm" command into
>> kernel.
>>
>> Perhaps I should use the term "qemu driver" instead of "kvm driver".
>>
>
> Ah, so you mean the libvirt QEMU driver isn't working. The best first
> step to diagnosing those problems is to stop the libvirtd daemon,
> and run it manually with debugging enabled
>
> LIBVIRT_DEBUG=1 /usr/sbin/libvirtd
>
> with any luck there will be some failure reported explaining why the
> QEMU driver didn't activate.
>
> Daniel
>
Dear Daniel,
I have enable the libvirt debug mode by setting LIBVIRT_DEBUG=1 and here
is the debug message:
======================================= debug message
=========================================
17:41:11.219: debug : virInitialize:290 : register drivers
17:41:11.219: debug : virRegisterDriver:667 : registering Test as driver 0
17:41:11.219: debug : virRegisterNetworkDriver:567 : registering Test as
network driver 0
17:41:11.219: debug : virRegisterStorageDriver:598 : registering Test as
storage driver 0
17:41:11.219: debug : virRegisterDeviceMonitor:629 : registering Test as
device driver 0
17:41:11.219: debug : virRegisterDriver:667 : registering Xen as driver 1
17:41:11.219: debug : vboxRegister:68 : VBoxCGlueInit failed: 0.0.0,
errorval=-1
17:41:11.219: debug : virRegisterDriver:667 : registering VBOX as driver 2
17:41:11.219: debug : virConnectOpen:1050 : name=qemu:///system
17:41:11.219: debug : do_open:920 : name "qemu:///system" to URI
components:
scheme qemu
opaque (null)
authority (null)
server (null)
user (null)
port 0
path /system
17:41:11.219: debug : do_open:930 : trying driver 0 (Test) ...
17:41:11.219: debug : do_open:936 : driver 0 Test returned DECLINED
17:41:11.219: debug : do_open:930 : trying driver 1 (Xen) ...
17:41:11.219: debug : do_open:936 : driver 1 Xen returned DECLINED
17:41:11.219: debug : do_open:930 : trying driver 2 (VBOX) ...
17:41:11.219: debug : do_open:936 : driver 2 VBOX returned DECLINED
libvir: error : could not connect to qemu:///system
17:41:11.219: debug : virUnrefConnect:210 : unref connection 0x60dd00 1
17:41:11.219: debug : virReleaseConnect:171 : release connection 0x60dd00
libvirt error: could not connect to qemu:///system (code=5)
error: failed to connect to hypervisor
================================end of debug message
=========================================
From the debug message, it seems that libvirt does not load qemu drivr
but it load Xen and VBOX driver........
However, the fact is that I have load KVM kernel module into kernel by
using "modprobe kvm" and "modprobe kvm_intel"
And the result of "lsmod|grep kvm" shows:
================================= result of lsmod
==============================================
[root at node2 ~]# lsmod | grep kvm
kvm_intel 46664 0
kvm 166224 1 kvm_intel
[root at node2 ~]#
================================= end of result of lsmod
=========================================
--
Jason Wong
System engineer
Cluster Technology Limited
Email: hcwong at clustertech.com
Direct Line: (852) 2655-6129
Tel: (852) 2655-6100
Fax: (852) 2994-2101
Website: www.clustertech.com
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