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<div class="moz-cite-prefix">On 03/29/2016 07:45 AM, Moshe Levi
wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I was testing <a moz-do-not-send="true"
name="elementsHostDev">Host device assignment</a> in
OpenStack environment where the driver name is vfio or kvm.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My setup is as follow: <o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]--><span dir="LTR"></span>Fedora 21<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]--><span dir="LTR"></span>Libvirt
1.3.0 which I compiled<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l1 level1 lfo1"><!--[if !supportLists]--><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]--><span dir="LTR"></span>OpenStack
master <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have also other setups with older Libvirt
version and the same OpenStack environment.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I notice that on my fedora environment the
driver name is vfio were in my old environment the driver name
is kvm.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">According to Libvirt documentation default
is "vfio" on systems where the VFIO driver is available and
loaded, see [1]<o:p></o:p></p>
<p class="MsoNormal">I remove the vfio modules by removing vfio,
vfio_iommu_type1, vfio_pci but when I boot a vm the drive name
is vfio<o:p></o:p></p>
<p class="MsoNormal">How can change the driver name to be kvm?</p>
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</blockquote>
<br>
libvirt tries very hard to use vfio rather than legacy kvm, because
legacy kvm is old, deprecated, and "declared bad" :-). But it won't
changed it to vfio if you've explicitly said that you want to use
kvm. If you really want to use legacy kvm device assignment,
manually set that in the config. When you do that, if the system
you're running on doesn't support it, it will error out rather than
switching.<br>
<br>
<blockquote
cite="mid:AM4PR05MB182628008587A83389C1424FD0870@AM4PR05MB1826.eurprd05.prod.outlook.com"
type="cite">
<div class="WordSection1">
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another thing that I encounter is an error
when suspending VM (in OpenStack environment) when the driver
name is vfio.<o:p></o:p></p>
<p class="MsoNormal">In such case I am getting the following
error from Libvirt:<o:p></o:p></p>
<p class="MsoNormal">2016-03-28 11:42:59.527 1966 ERROR
oslo_messaging.rpc.dispatcher File
"/usr/lib64/python2.7/site-packages/libvirt.py", line 560, in
attachDeviceFlags<o:p></o:p></p>
<p class="MsoNormal">2016-03-28 11:42:59.527 1966 ERROR
oslo_messaging.rpc.dispatcher if ret == -1: raise
libvirtError ('virDomainAttachDeviceFlags() failed', dom=self)<o:p></o:p></p>
<p class="MsoNormal">2016-03-28 11:42:59.527 1966 ERROR
oslo_messaging.rpc.dispatcher libvirtError: internal error:
unable to execute QEMU command 'device_add': Device
initialization failed.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would appreciate for some pointers on
what can cause this issue.</p>
</div>
</blockquote>
<br>
Assuming that openstack uses libvirt's virDomainSave API I would
expect suspending a guest to fail if it had an assigned device
(since libvirt implements this by "migrating to disk", and qemu
doesn't allow migration of a guest with an assigned device. But your
problem is that it's trying to *attach* a device, which I wouldn't
consider to be a part of a save or suspend or whatever operation. Is
it possible to get more information about what leads up to this?<br>
<br>
<br>
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<div class="WordSection1">
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[1] <a moz-do-not-send="true"
href="https://libvirt.org/formatdomain.html#elementsHostDev">
https://libvirt.org/formatdomain.html#elementsHostDev</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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