hi all,
in openstack, we can use the pci passthrough feature now, refer to
https://wiki.openstack.org/wiki/Pci_passthrough
but we can't definitely specify the host pci driver is LEGACY_KVM
or newer VFIO,
new VFIO driver is more safer, and higher-performance user-space
driver
than legacy kvm driver (pci-stub), the benefit relative to kvm
assignment driver
could refer to http://lwn.net/Articles/474088/.
In additional, VFIO driver provides the GPU passthrough as primary
card support.
I think it is more useful for further GPU passthrough support in
openstack.
Openstack relies on the libvirt nodedev device configuration to do
pci passthrough,
with managed mode, the configured device is automatically detached
and re-attached
with KVM or VFIO driver that depended on the host driver modules
configuration,
so now we can't specify the driver in openstack to VFIO mode, I
think we should need
to add this feature support in openstack to get pci passhthrough
more scalability.
a simply idea is to add a option in nova.conf HOST_PCI_MODEL =
VFIO /KVM to specify
the pci passthrough device driver is using VFIO driver.
any comments are welcome. :)
Thanks,
Chen
--
Sincerely,
Chen Fan
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