Re: kvm pci passthrough

[Muli Ben-Yehuda <muli@il.ibm.com>]

On Wed, Oct 29, 2008 at 05:44:54PM -0700, David Brown wrote:

> I was wondering what the status of kvm pci passthrough is?
> Especially the kind where I don't have vt-d? Where are the parts to
> play with? Is there any documentation you can point me to?

Hi David,

The kind where you *do* have VT-d is now included in the kernel and
userspace trees, and should "just work" (tell us if it doesn't). You
should clone the kernel and userspace trees, verify that the device
assignment patches are included in the userspace tree (they were
applied just now and may take some time to sync) and then run the
guest with:

-pcidevice host=bus:dev.func

Where the bus, dev, and func are what lspci shows you for the device
(on the host). You should also make sure that the device isn't used by
any driver on the host first.

For the other kinds (pvdma-without-iommu and reserved mem) I don't
know of the latest status.

Cheers,
Muli
-- 
The First Workshop on I/O Virtualization (WIOV '08)
Dec 2008, San Diego, CA, http://www.usenix.org/wiov08/
                       <->
SYSTOR 2009---The Israeli Experimental Systems Conference
http://www.haifa.il.ibm.com/conferences/systor2009/