Re: [Qemu-discuss] failed to start qemu after system restart

[Jakob Bohm]

Qemu obviously fails to use the kvm kernel module because
the CPU specific kvm module (kvm_amd or kvm_intel) has
not been loaded.  This has nothing to do with the qemu
command line (except that you could probably run qemu
slowly without the --enable-kvm option).

The reason for kvm_amd or kvm_intel not being loaded is
what you should look at.

Try to modprobe the right one (kvm_amd or kvm_intel)
manually, then look at the system log messages (from boot,
from your first attempt to run qemu --enable-kvm after
boot and from your modprobe attempt).  Look for any
messages mentioning kvm, VT, svm, virtualization or
anything else that could explain this.

Also look at /proc/cpuinfo it should mention "svm" but
not "vmmcall" if it is an AMD CPU or "vmx", but not
"hypervisor" if it is an Intel CPU.

In your list of modules the only thing I can see that
looks suspicious is that you seem to have a number of
virtualbox modules and some other strange virtualization
drivers loaded that makes me suspect that there is
another virtualization program interfering with kvm use
of the CPU's virtualization features.


On 07/04/2016 19:55, Mahmood Naderan wrote:
> I have really stuck at this error and I am not able to run the virtual 
> machine. Before the reboot, the following command worked perfectly 
> (note that this is the full command including the options for SAMBA 
> file sharing between host and guest)
>
>
> qemu-system-x86_64 -m 4096 -hda winxp64_c.img -hdb winxp64_d.img 
> --boot c -usbdevice tablet -enable-kvm -device e1000,netdev=host_files 
> -netdev 
> user,net=10.0.2.0/24,id=host_files,restrict=off,smb=/home/mahmood,smbserver=10.0.2.4 
> -vnc :10
>
>
> But, now I get this error
>
>
> Could not access KVM kernel module: No such file or directory
> failed to initialize KVM: No such file or directory
>
>
>
> Here are some more info:
>
>
> address@hidden:~# cat /etc/group | grep qemu
> kvm:x:36:qemu,mahmood
> qemu:x:107:
>
>
>
> address@hidden:~# lsmod
> Module                  Size  Used by
> kvm                   314739  0
> nfsd                  305863  13
> lockd                  74270  1 nfsd
> nfs_acl                 2647  1 nfsd
> auth_rpcgss            44895  1 nfsd
> exportfs                4236  1 nfsd
> autofs4                27212  3
> sunrpc                263516  17 nfsd,lockd,nfs_acl,auth_rpcgss
> bnx2fc                122257  0
> cnic                   54703  1 bnx2fc
> uio                    10974  1 cnic
> fcoe                   22334  0
> libfcoe                39764  2 bnx2fc,fcoe
> libfc                 108727  3 bnx2fc,fcoe,libfcoe
> scsi_transport_fc      55235  3 bnx2fc,fcoe,libfc
> scsi_tgt               12173  1 scsi_transport_fc
> vboxpci                14791  0
> vboxnetadp             19135  0
> vboxnetflt             19387  0
> vboxdrv               454175  3 vboxpci,vboxnetadp,vboxnetflt
> 8021q                  25941  0
> garp                    7344  1 8021q
> stp                     2173  1 garp
> llc                     5642  2 garp,stp
> vmnet                  44419  13
> ppdev                   8729  0
> parport_pc             22978  0
> parport                37265  2 ppdev,parport_pc
> vmblock                12343  1
> fuse                   66891  0
> vsock                  46154  0
> vmci                   80758  1 vsock
> vmmon                  80538  0
> ipmi_devintf            8049  0
> ipmi_si                42401  0
> ipmi_msghandler        35992  2 ipmi_devintf,ipmi_si
> cpufreq_ondemand       10544  32
> powernow_k8            18267  1
> freq_table              4881  2 cpufreq_ondemand,powernow_k8
> mperf                   1557  1 powernow_k8
> xt_state                1492  8
> ipt_REJECT              2351  7
> xt_multiport            2700  3
> iptable_filter          2793  1
> ipt_MASQUERADE          2466  1
> iptable_nat             6158  1
> nf_nat                 22759  2 ipt_MASQUERADE,iptable_nat
> nf_conntrack_ipv4       9506  11 iptable_nat,nf_nat
> nf_conntrack           79453  5 
> xt_state,ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4
> nf_defrag_ipv4          1483  1 nf_conntrack_ipv4
> ip_tables              17831  2 iptable_filter,iptable_nat
> ib_ipoib               77230  0
> rdma_ucm               13433  0
> ib_ucm                 12569  0
> ib_uverbs              36269  2 rdma_ucm,ib_ucm
> ib_umad                12122  0
> rdma_cm                35253  1 rdma_ucm
> ib_cm                  37028  3 ib_ipoib,ib_ucm,rdma_cm
> iw_cm                   8740  1 rdma_cm
> ib_addr                 6091  1 rdma_cm
> ipv6                  323408  138 cnic,vboxnetflt,ib_ipoib,ib_addr
> ib_sa                  22854  4 ib_ipoib,rdma_ucm,rdma_cm,ib_cm
> ib_mad                 40544  3 ib_umad,ib_cm,ib_sa
> ib_core                74343  10 
> ib_ipoib,rdma_ucm,ib_ucm,ib_uverbs,ib_umad,rdma_cm,ib_cm,iw_cm,ib_sa,ib_mad
> igb                   161537  0
> dca                     7197  1 igb
> e1000e                222137  0
> microcode             112653  0
> serio_raw               4818  0
> sg                     30124  0
> k10temp                 3577  0
> amd64_edac_mod         21461  0
> edac_core              46773  6 amd64_edac_mod
> edac_mce_amd           15488  1 amd64_edac_mod
> i2c_piix4              12608  0
> i2c_core               31276  1 i2c_piix4
> shpchp                 33482  0
> ext4                  371395  3
> mbcache                 8144  1 ext4
> jbd2                   93312  1 ext4
> sd_mod                 39488  6
> crc_t10dif              1541  1 sd_mod
> sr_mod                 16228  0
> cdrom                  39803  1 sr_mod
> mpt2sas               183003  0
> scsi_transport_sas     35940  1 mpt2sas
> raid_class              4804  1 mpt2sas
> megaraid_sas           77643  4
> ata_generic             3837  0
> pata_acpi               3701  0
> pata_atiixp             4211  0
> ahci                   40871  0
> dm_mirror              14101  0
> dm_region_hash         12170  1 dm_mirror
> dm_log                 10122  2 dm_mirror,dm_region_hash
> dm_mod                 81692  2 dm_mirror,dm_log
>
>
> Regards,
> Mahmood
>
>
> On Thursday, April 7, 2016 7:48 PM, Mahmood Naderan 
> <address@hidden> wrote:
>
>
> >Have you added "-enable-kvm" to your qemu scripts recently?
>
> I always used "qemu -cdrom .... -enable-kvm -vnc :10 ....." in my 
> commands.
>
> What do you mean by qemu scripts?
>
> Regards,
> Mahmood


Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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