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Bug 507612

Summary: kvm, kmod-kvm, and ksm modules fail to load
Product: Red Hat Enterprise Linux 5 Reporter: Wayne Berthiaume <berthiaume_wayne>
Component: kvmAssignee: Eduardo Habkost <ehabkost>
Status: CLOSED NOTABUG QA Contact: Lawrence Lim <llim>
Severity: high Docs Contact:
Priority: low    
Version: 5.4CC: andriusb, coughlan, hicks_verdell, murphy_shawn, rprice, tools-bugs, virt-maint, ykaul
Target Milestone: beta   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
KVM can only be used with the non-Xen kernel. KVM modules will not load, nor function when running the Xen hypervisor and Xen kernel.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2009-06-23 14:26:24 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 468301    

Description Wayne Berthiaume 2009-06-23 13:39:02 UTC 
Description of problem:
Modules fail to load via modprobe() or insmod()

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:
[root@l82bi204 ~]# insmod /lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm.ko
insmod: error inserting '/lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm.ko': -1 Invalid module format
[root@l82bi204 ~]# insmod /lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm-intel.ko.ko
insmod: can't read '/lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm-intel.ko.ko': No such file or directory
[root@l82bi204 ~]# insmod /lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm-intel.ko
insmod: error inserting '/lib/modules/2.6.18-152.el5/extra/kmod-kvm/kvm-intel.ko': -1 Invalid module format
[root@l82bi204 ~]# insmod /lib/modules/2.6.18-152.el5/extra/kmod-kvm/ksm.ko
insmod: error inserting '/lib/modules/2.6.18-152.el5/extra/kmod-kvm/ksm.ko': -1 Invalid module format
[root@l82bi204 ~]# uname -a
Linux l82bi204.lss.emc.com 2.6.18-152.el5xen #1 SMP Wed Jun 3 19:14:54 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
You have new mail in /var/spool/mail/root
[root@l82bi204 ~]# modprobe kvm
FATAL: Module kvm not found.
[root@l82bi204 ~]# modprobe kmod-kvm
FATAL: Module kmod_kvm not found.
[root@l82bi204 ~]# modprobe ksm
FATAL: Module ksm not found.
[root@l82bi204 ~]# ls -las /lib/modules/2.6.18-152.el5/extra/kmod-kvm/
total 4504
   8 drwxr-xr-x 2 root root    4096 Jun 15 14:18 .
   8 drwxr-xr-x 4 root root    4096 Jun 15 14:19 ..
 348 -rw-r--r-- 1 root root  346211 Jun  8 13:03 ksm.ko
 520 -rw-r--r-- 1 root root  521412 Jun  8 13:03 kvm-amd.ko
 740 -rw-r--r-- 1 root root  749254 Jun  8 13:03 kvm-intel.ko
2880 -rw-r--r-- 1 root root 2937430 Jun  8 13:03 kvm.ko
[root@l82bi204 ~]# rpm -qa | grep kernel
kernel-2.6.18-152.el5
kernel-headers-2.6.18-152.el5
kernel-xen-devel-2.6.18-152.el5
kernel-xen-2.6.18-152.el5
[root@l82bi204 ~]# rpm -qa | grep kvm
kmod-kvm-83-72.el5
etherboot-zroms-kvm-5.4.4-10.el5
etherboot-roms-kvm-5.4.4-10.el5
kvm-tools-83-72.el5
kvm-qemu-img-83-72.el5
kvm-83-72.el5
[root@l82bi204 ~]#                   

Expected results:
Modules load and VMs can be installed.

Additional info:
Comment 2 Eduardo Habkost 2009-06-23 14:00:21 UTC 
You are running a xen kernel (2.6.18-152.el5xen), you can't load the 2.6.18-152.el5 modules on it. For two reasons: 1) they are for a different kernel version so they will never load; 2) you can't run KVM under a xen kernel.

Please try again after booting a non-xen kernel.
Comment 3 Wayne Berthiaume 2009-06-23 14:08:37 UTC 
Hi Eduardo.

    That thought just occurred to me as well after I comitted the BZ. I rebooted the server with the PAE kernel and the kvm and ksm modules are loaded.

     On a seperate note, is there documentation on configuring VMs?

Regards,
Wayne.
Comment 4 Eduardo Habkost 2009-06-23 14:26:24 UTC 
(In reply to comment #3)
> Hi Eduardo.
> 
>     That thought just occurred to me as well after I comitted the BZ. I
> rebooted the server with the PAE kernel and the kvm and ksm modules are loaded.

Thanks.


> 
>      On a seperate note, is there documentation on configuring VMs?

The recommended way is to use libvirt, and the tools that use libvirt (virsh, virt-manager, virt-install). I normally use the upstream documentation on libvirt.org. I suppose there is RHEL-specific documentation too, but I would need to ask the documentation team.
Comment 5 Bill Burns 2009-06-25 12:56:14 UTC 
Release note added. If any revisions are required, please set the 
"requires_release_notes" flag to "?" and edit the "Release Notes" field accordingly.
All revisions will be proofread by the Engineering Content Services team.

New Contents:
KVM can only be used with the non-Xen kernel. LVM modules will not load or function when running the Xen hypervisor and Xen kernel.
Comment 6 Andrius Benokraitis 2009-06-27 04:02:06 UTC 
Release note updated. If any revisions are required, please set the 
"requires_release_notes"  flag to "?" and edit the "Release Notes" field accordingly.
All revisions will be proofread by the Engineering Content Services team.

Diffed Contents:
@@ -1 +1 @@
-KVM can only be used with the non-Xen kernel. LVM modules will not load or function when running the Xen hypervisor and Xen kernel.+KVM can only be used with the non-Xen kernel. LVM modules will not load, nor function when running the Xen hypervisor and Xen kernel.
Comment 7 Eduardo Habkost 2009-06-29 22:59:38 UTC 
Release note updated. If any revisions are required, please set the 
"requires_release_notes"  flag to "?" and edit the "Release Notes" field accordingly.
All revisions will be proofread by the Engineering Content Services team.

Diffed Contents:
@@ -1 +1 @@
-KVM can only be used with the non-Xen kernel. LVM modules will not load, nor function when running the Xen hypervisor and Xen kernel.+KVM can only be used with the non-Xen kernel. KVM modules will not load, nor function when running the Xen hypervisor and Xen kernel.