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Hi,<br>
<br>
Thanks for your answer. everything is all right now, I've managed to
resolve the issue thanks to your suggestion. <br>
This is what I've done:<br>
<ol>
<li>I recall that my processor is a Westmere one<br>
</li>
<li>first on the hypervisor :<br>
[root@node ~]# qemu-kvm -version<br>
QEMU emulator version 1.0.1 (qemu-kvm-devel), Copyright (c)
2003-2008 Fabrice Bellard<br>
<br>
this qemu-kvm release is the one from the F17 update repository<br>
<br>
</li>
<li>still on the hypervisor<br>
[root@node ~]# qemu-kvm -cpu ?<br>
x86 Opteron_G3<br>
x86 Opteron_G2<br>
x86 Opteron_G1<br>
x86 SandyBridge<br>
x86 Nehalem<br>
x86 Penryn<br>
x86 Conroe<br>
x86 [n270]<br>
x86 [athlon]<br>
x86 [pentium3]<br>
x86 [pentium2]<br>
x86 [pentium]<br>
x86 [486]<br>
x86 [coreduo]<br>
x86 [kvm32]<br>
x86 [qemu32]<br>
x86 [kvm64]<br>
x86 [core2duo]<br>
x86 [phenom]<br>
x86 [qemu64]<br>
<br>
<br>
<br>
So we can see there that no Westmere or neither Opteron_G4 is
supported by 1.0.1 qemu-kvm. the consequence is this message on
the hypervisor logs : "Preferred CPU model Westmere not allowed
by hypervisor; closest supported model will be used"<br>
<br>
</li>
<li>when doing "ps aux | grep enable-kvm", we see the -cpu flag
being kvm64, a generic kvm processor. But none of the proposed
item into the "CPU name" cluster field matches with "kvm64",
that's the reason why it's impossible there to run a nested KVM.
A kvm64 item should successfully launch the vm, but it will
never be implemented into the ovirt webadmin because nested KVM
is only for testing purpose (and vm performances are very bad !)<br>
<br>
</li>
<li>So what doing when we have a Westmere processor type and a F17
so as to successfully run a nested kvm???? upgrading to qemu 1.2
thanks to the virt preview repository
(<a class="moz-txt-link-freetext" href="http://fedoraproject.org/wiki/Virtualization_Preview_Repository">http://fedoraproject.org/wiki/Virtualization_Preview_Repository</a>)
now running qemu-kvm -cpu ? gives :<br>
[root@node ~]# qemu-kvm -cpu ?<br>
x86 Opteron_G4<br>
x86 Opteron_G3<br>
x86 Opteron_G2<br>
x86 Opteron_G1<br>
x86 SandyBridge<br>
x86 Westmere<br>
x86 Nehalem<br>
x86 Penryn<br>
x86 Conroe<br>
x86 [n270]<br>
x86 [athlon]<br>
x86 [pentium3]<br>
x86 [pentium2]<br>
x86 [pentium]<br>
x86 [486]<br>
x86 [coreduo]<br>
x86 [kvm32]<br>
x86 [qemu32]<br>
x86 [kvm64]<br>
x86 [core2duo]<br>
x86 [phenom]<br>
x86 [qemu64]<br>
<br>
Now when running the hypervisor with the Westmere cpu flag is
successfull and the kvm64 flag is not used anymore. Then,
chosing the Westmere Family into the CPU family cluster field
will launch the nested vm with the right Westmere flag !</li>
</ol>
<p>Obviously, qemu-kvm 1.2 will be included by default into F18 and
all of this will be deprecated but waiting for, upgrading the qemu
version can be very useful having a running test environnment with
many virtual hypervisor when the hardware is a Wetmere family one.<br>
</p>
<div class="moz-cite-prefix">Le 26/09/2012 04:06, Mark Wu a écrit :<br>
</div>
<blockquote cite="mid:50626322.6020307@linux.vnet.ibm.com"
type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
On 09/26/2012 12:58 AM, Nathanaël Blanchet wrote:
<blockquote cite="mid:5061E2C1.2060800@abes.fr" type="cite">Hello,
<br>
<br>
I've tried many times to run a node as a guest in ovirt
following <a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://wiki.ovirt.org/wiki/Vdsm_Developers#Running_Node_as_guest_-_Nested_KVM">http://wiki.ovirt.org/wiki/Vdsm_Developers#Running_Node_as_guest_-_Nested_KVM</a>
. The result is that I'm able to register such a host in engine,
but it is impossible to start any vm on it. If I boot on an ISO,
I can see the first prompt and move between the items. But since
I begin the installation I have a blank screen and the vm goes
into pause mode in vit-manager. Then I have no way else than
rebooting the hypervisor guest because it is impossible to
resume. When I get logs on the real host, I can find this : <br>
arning : x86Decode:1306 : Preferred CPU model Westmere not
allowed by hypervisor; closest supported model will be used <br>
Sep 25 17:11:59 khamsin libvirtd[23053]: 2012-09-25
15:11:59.384+0000: 23054: warning : x86Decode:1306 : Preferred
CPU model Westmere not allowed by hypervisor; closest supported
model will be used <br>
Sep 25 17:12:19 khamsin libvirtd[23053]: 2012-09-25
15:12:19.150+0000: 23055: warning : x86Decode:1306 : Preferred
CPU model Westmere not allowed by hypervisor; closest supported
model will be used <br>
Sep 25 17:45:48 khamsin libvirtd[23053]: 2012-09-25
15:45:48.342+0000: 23058: warning : x86Decode:1306 : Preferred
CPU model Westmere not allowed by hypervisor; closest supported
model will be used <br>
Sep 25 18:07:05 khamsin libvirtd[23053]: 2012-09-25
16:07:05.834+0000: 23058: warning : x86Decode:1306 : Preferred
CPU model Nehalem not allowed by hypervisor; closest supported
model will be used <br>
Sep 25 18:44:47 khamsin libvirtd[23053]: 2012-09-25
16:44:47.340+0000: 23057: warning : x86Decode:1306 : Preferred
CPU model Penryn not allowed by hypervisor; closest supported
model will be used <br>
<br>
As you can see, I have tried many cpu type for launching this
guest hypervisor, but none of them is accepted by the
hypervisor. Plus, I've modified each time the family type in the
cluster tab, but it is the same. <br>
On the hist: <br>
#virsh capabilities gives <br>
<cpu> <br>
<arch>x86_64</arch> <br>
<model>Westmere</model> <br>
<vendor>Intel</vendor> <br>
<br>
Thanks for your help <br>
</blockquote>
<br>
<br>
What does the command 'qemu-kvm -cpu ?' give ? Could you please
try the following guest cpu definition?<br>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<pre style="border: 0px; font-family: 'Courier 10 Pitch', Courier, monospace; font-size: 13px; font-style: normal; font-weight: normal; margin: 0px 0px 1.625em; outline: 0px; padding: 0.75em 1.625em; vertical-align: baseline; background-color: rgb(244, 244, 244); font-variant: normal; line-height: 1.5; overflow: auto; color: rgb(55, 55, 55); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-position: initial initial; background-repeat: initial initial;"><strong style="border: 0px; font-family: inherit; font-size: 13px; font-style: inherit; font-weight: bold; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;"><tt style="border: 0px; font-family: inherit; font-size: 13px; font-style: inherit; font-weight: inherit; margin: 0px; outline: 0px; padding: 0px; vertical-align: baseline;">
<cpu match='exact'>
<model>core2duo</model>
<feature policy='require' name='vmx'/>
</cpu>
</tt></strong></pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Nathanaël Blanchet
Supervision réseau
Pôle exploitation et maintenance
Département des systèmes d'information
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
<a class="moz-txt-link-abbreviated" href="mailto:blanchet@abes.fr">blanchet@abes.fr</a> </pre>
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