Re: Xen with libvirt and SR-IOV

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On 3/21/23 11:05, nospam@xxxxxxxxx wrote:
Hi everybody,

since long time, I'm using Xen on CentOS with XL, currently latest CentOS 7 with Xen 4.15 from the CentOS-Xen-Project. For several VMs I have to use SR-IOV, to lower the CPU-usage on Dom0 on the host.

CentOS 7 comes to an end, Xen is not supported by RHEL nor RockyLinux anymore, so unfortunately I have to switch to KVM.

First step will be now, converting all the scripts for managing and running VMs, that they run with the additional libvirt-layer.

What is the libvirt version?

Mostly everything is working, but I do not get a network interface in the VM, when I start it with "virsh start ..." instead of "xl create ...".

First of all, is there documentation how to configure the VMs in the dom-definition for XEN (all docs I found are KVM-related)?

I know it's not complete, but makes an attempt to identify hypervisor support for the various configuration settings.

The converted xl-config does not do the job:

virsh -c xen:/// domxml-from-native --format xen-xl vm > vm.xml

These are some none working examples I tried out:

     <interface type='hostdev' managed='yes'>
       <mac address='02:16:32:10:20:30'/>
       <driver name='xen'/>
        <address type='pci' domain='0x0000' bus='0x81' slot='0x02' function='0x6'/>
         <tag id='11'/>

     <hostdev mode='subsystem' type='pci' managed='yes'>
       <driver name='xen'/>
         <address domain='0x0000' bus='0x81' slot='0x02' function='0x6'/>
       <address type='pci' domain='0x0000' bus='0x81' slot='0x02' function='0x6'/>

I've used both configurations successfully. Has the sriov virtual function been unbound from the native driver and bound to xen-pciback? You can check which driver is in use with something like

ls /sys/bus/pci/devices/0000\:81\:02.6/driver

If bound to xen-pciback, it vf should also appear in the output of 'xl pci-assignable-list'.


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