Re: Status of pci passthrough work?

[Thomas Fjellstrom <tfjellstrom@shaw.ca>]

On Saturday 27 September 2008, Han, Weidong wrote:
> Thomas Fjellstrom wrote:
> > On Saturday 27 September 2008, Han, Weidong wrote:
> >> Hi Thomas,
> >>
> >> the patches of passthrough/VT-d on kvm.git are already checked in.
> >> With Amit's userspace patches, you can assign device to guest. You
> >> can have a try.
> >
> > Does that mean I need VT-d support in hardware? All I have to test
> > with right now is an AMD Phenom X4  with a 780g+sb700 system. Don't
> > think it has an iommu, and I'd find it odd if the intel VT-d code
> > "just worked" on amd's hardware.
>
> Yes, currently you need VT-d support in hardware to assign device.

So I take it the PV-DMA (or pv-dma doesn't do what I think it does...) or the 
other 1:1 device pass through work isn't working right now?

It's something I'd really like to use, but I don't have access to a platform 
with a hardware iommu. Though I might be able to pick up a replacement board 
for my new server with the SB750 southbridge which supposedly has AMD's new 
iommu hardware in it, but I haven't seen any evidence that kvm or linux 
supports it.

> Randy (Weidong)
>
> >> Randy (Weidong)
> >>
> >> Thomas Fjellstrom wrote:
> >>> I'm very interested in being able to pass a few devices through to
> >>> kvm guests. I'm wondering what exactly is working now, and how I
> >>> can start testing it?
> >>>
> >>> the latest kvm release doesn't seem to include any support for it in
> >>> userspace, so I can't test it with that...
> >>>
> >>> Basically what I want to do is assign a two or three physical nics
> >>> (100mb and GiB) to one vm, some tv tuner cards to another.
> >>>
> >>> Also, I'm wondering if AMD's iommu in the SB750 southbridge is
> >>> supported yet? Or if anyone is working on it?
> >>>
> >>> --
> >>> Thomas Fjellstrom
> >>> tfjellstrom@shaw.ca
> >>
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe kvm" in
> >> the body of a message to majordomo@vger.kernel.org
> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> > --
> > Thomas Fjellstrom
> > tfjellstrom@shaw.ca


-- 
Thomas Fjellstrom
tfjellstrom@shaw.ca