KVM test: Add PCI device assignment support
Add support to PCI device assignment on the kvm test. It supports
both SR-IOV virtual functions and physical NIC card device
assignment.
Single Root I/O Virtualization (SR-IOV) allows a single PCI device to
be shared amongst multiple virtual machines while retaining the
performance benefit of assigning a PCI device to a virtual machine.
A common example is where a single SR-IOV capable NIC - with perhaps
only a single physical network port - might be shared with multiple
virtual machines by assigning a virtual function to each VM.
SR-IOV support is implemented in the kernel. The core implementation
is contained in the PCI subsystem, but there must also be driver support
for both the Physical Function (PF) and Virtual Function (VF) devices.
With an SR-IOV capable device one can allocate VFs from a PF. The VFs
surface as PCI devices which are backed on the physical PCI device by
resources (queues, and register sets).
Device support:
In 2.6.30, the Intel® 82576 Gigabit Ethernet Controller is the only
SR-IOV capable device supported. The igb driver has PF support and the
igbvf has VF support.
In 2.6.31 the Neterion® X3100™ is supported as well. This device uses
the same vxge driver for the PF as well as the VFs.
In order to configure the test:
* For SR-IOV virtual functions passthrough, we could specify the
module parameter 'max_vfs' in config file.
* For physical NIC card pass through, we should specify the device
name(s).
Signed-off-by: Yolkfull Chow <yzhou@redhat.com>
Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
git-svn-id: http://test.kernel.org/svn/autotest/trunk@4144 592f7852-d20e-0410-864c-8624ca9c26a4
3 files changed