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Solarflare Server Adapter User Guide
SR ‐ IOV Virtualization Using KVM
Issue 20 © Solarflare Communications 2017 343
1 A description of how the VF interface is managed ‐ added by the user.
2 The MAC address. If not specified by the user this will be automatically assigned
a random MAC address by the guest OS. The user can specify a MAC address
when editing the XML file.
3 The source dev is the VF interface identifier ‐ added by the user. The user
should also specify the mode which must be ‘passthrough’.
4 If not specified by the user, the model type will be automatically assigned by
libvirt when the guest is started.
5 The VF PCIe address (as known by the guest) will be added automatically by
libvirt.
For further information about the direct passthrough configuration and XML
formats, refer to the following link: http://libvirt.org/
formatdomain.html#elementsNICSDirect
KVM Libvirt Network Hostdev
Network Hostdev exposes VFs directly into guest VMs allowing the data path to fully
bypass the host OS and therefore provides maximum acceleration for network
traffic.
Figure 56: SR ‐ IOV VFs passed to guests
• The hostdev configuration delivers the highest throughput and lowest latency
performance. Because the guest is directly linked to the virtual function
therefore directly connected to the underlying hardware.