Re: [ovirt-users] Nested KVM - vdsm-hook-nestedvt

[wdh]

Hi all,

OK, it seems I am confused. Nested KVM is NOT the same as fake KVM

If so, I installed vdsm-hook-nestedvt on the hypervisor (only). Trying 
to run ovirt-Node on a VM it complains there 's no virtualization, 
despite the kvm_amd module is loaded with nested=1


How to enable nested-kvm for oVirt 3.6?

Winny


Martin Polednik schreef op 04-01-2016 13:29:

On 04/01/16 09:52 +0100, Simone Tiraboschi wrote:

On Fri, Jan 1, 2016 at 3:32 PM, Winfried de Heiden  wrote:


Hi all and happy new year!

I'm running oVirt 3.6 on EL7.

In order to test nested-kvm I installed vdsm-hook-nestedvt on the
hypervisor and put "fake_kvm_support = true" in /etc/vdsm/vdsm.conf.





fake_kvm_support is just for developing purposes and it's not needed 
as it

prevent guests to run.


Not really true - fake_kvm_support enables QEMU emulation instead of
hardware virtualization (e.g. VT-x) instructions. It is also quite
broken in it's current state and fix is pending in cpuinfo branch at
gerrit.

I don't really understand the reason why fake_kvm would be used in
this case as AMD-v is enabled according to svm flag present -
following instructions should be correct for getting the flag passed
to the VMs.


Please check to understand if nested support is enabled on your host:
/sys/module/kvm_intel/parameters/nested

if not
  echo "options kvm-intel nested=1" > /etc/modprobe.d/kvm-intel.conf
and reload the module



Than install vdsm-hook-nestedvt on your hosts.
If you want also to use the network on your L2 guest please install 
and
configure also macspoof vdsm hook on your physical hosts otherwise all 
the

traffic to/from your L2 guests will be dropped.
https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/macspoof





However, afterwards the hypervisor host cannot connect to the ovirt
Manager, on ovirt Manager the engine.log will tell:

2016-01-01 15:21:42,105 WARN
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
(DefaultQuartzScheduler_Worker-76) [71d1638c] Correlation ID: 
29daf92c,

Call Stack: null, Custom Event ID: -1, Message: Host bigvirt moved to
Non-Operational state as host does not meet the cluster's minimum CPU
level. Missing CPU features : model_Opteron_G3

After removing the option all works well again, but I'ḿ lacking the 
nested

kvm option :( Is nested kvm only supported on a limited cpu's??

Winny

Information from /proc/cpuinfo:

processor   : 0
vendor_id   : AuthenticAMD
cpu family  : 16
model   : 10
model name  : AMD Phenom(tm) II X6 1055T Processor
stepping: 0
microcode   : 0x1bf
cpu MHz : 2800.000
cache size  : 512 KB
physical id : 0
siblings: 6
core id : 0
cpu cores   : 6
apicid  : 0
initial apicid  : 0
fpu : yes
fpu_exception   : yes
cpuid level : 6
wp  : yes
flags   : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr 
pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext 
fxsr_opt
pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl 
nonstop_tsc

extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm
extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs 
skinit wdt

cpb hw_pstate npt lbrv svm_lock nrip_save pausefilter
bogomips: 5625.54
TLB size: 1024 4K pages
clflush size: 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb

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[Users] Change virtual disk interface

[wdh]

I have serveral old KVM virtual images, all off them using virtio  
for networking and disks. Trying to import these into my EXPORT  
datastore ends up with an error:


 virt-v2v -i libvirt -o rhev -os 10.0.0.3:/nfs/export  -n br0 PXE5-test
 PXE5.img: 100% [=]

 virt-v2v: WARNING: Unable to convert this guest operating system. Its
storage will be transfered and a domain created for it, but it may not
operate correctly without manual reconfiguration. The domain will present
all storage devices as ide, all network interfaces as rtl8139 and the host
as x86_64.
 virt-v2v: PXE5-test configured without virtio drivers.

How can I avoid these errors?
How can I fix this error.

After restoring the image, I am able to change the network interface  
from rtl8139 to Virtio. However; I cannot change the disk. In the  
admin console going to Virtual Machines -- virtual machine --  
Virtual Disks -- disk -- Edit gives a menu, but the only option I  
can change is is bootable. Options  like Interface are grey and  
cannot be modified.



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