[libvirt-users] sr-vio on intel while virsh chooses rtl8139 for model type

lejeczek peljasz at yahoo.co.uk
Wed Oct 8 14:03:42 UTC 2014

On 08/10/14 08:35, lejeczek wrote:
> On 03/10/14 17:15, Laine Stump wrote:
>> On 10/03/2014 11:38 AM, lejeczek wrote:
>>> hi everybody
>>> I'd presume virsh makes the best possible choice, right?
>>> It is that just seems bit... odd having realtek in guest 
>>> and Intel's
>>> VF on host, no?
>> This can safely be ignored - in the case of an SRIOV VF 
>> that is assigned
>> to the guest using PCI passthrough device assignment, the 
>> "model"
>> attribute is meaningless, but libvirt will always fill in 
>> the default
>> value (which is rtl8139) in the XML to prevent surprises 
>> if the default
>> emulated NIC model ever changes.
>> (I am assuming that you're using either <interface 
>> type='hostdev'> or
>> <interface type='network'> pointint to a network that has 
>> <forward
>> mode='hostdev'>. If you are instead using "type='direct'" 
>> or a network
>> with "<forward mode='bridge|passthrough|vepa'>" then the 
>> model *does*
>> matter, and you probably want to set it to "virtio", 
>> which is *not* the
>> default because not all guest OSes have a virtio network 
>> driver by
>> default (e.g. MS Windows))
> I don't use forward (unless libvirt does that for me) but 
> I have a pool like this one:
> <interface type='network'>
>       <mac address='52:54:00:51:af:0e'/>
>       <source network='passpool-enp2s0f0'/>
>       <model type='rtl8139'/>
>       <address type='pci' domain='0x0000' bus='0x00' 
> slot='0x07' function='0x0'/>
>     </interface>
> In a win 2008 guest OS is missing drivers for this device 
> and I wonder what is that it gets?
answering my own question a line above - seems guest needs 
driver of the host's real device, in my case Intel's.
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