On Thu, Oct 14, 2010 at 11:26:03AM -0600, Lin, Ray wrote:
>
> Konrad,
>
> We choose "Virtual" and the dom0/domU show like this. It doesn't remap to
> what we want. You mentioned about "write your own plugin that would do
> remapping per your desire". Could you elaborate it a bit ? Thanks.
Sure. Look in drivers/xen/pciback. There are four files of interest:
vpci.c
slot.c
passthrough.c
controller.c
By default, the vpci.c is selected, where in the domU the devices start
from 00:00.0. The passthrough is obvious.
The slot.c is where we have only two bus and all the devices are stuck under
the slots.
So a maximum of 64 devices, and the device function is ignored:
This is what it would show up (I think, you might want to double-check this):
00:01.0:0c04: 11f8:8032 (rev 08)
00:02.0:0c04: 11f8:8032 (rev 08)
00:03.0:0c04: 11f8:8032 (rev 08)
00:04.0:0c04: 11f8:8032 (rev 08)
The controller, is "PCI "Controller" Backend - virtualize PCI bus topology
based on PCI
controllers. Devices under the same PCI controller are exposed on the
same virtual domain:bus. Within a bus, device slots are virtualized
to compact the bus. " (from controller.c)
I think based on what you said earlier, you just want to use the "slot" backend:
CONFIG_XEN_PCIDEV_BACKEND_SLOT=y
>
> Dom0:
> kaan-18:~# lspci -n | grep 11f8
> 07:00.0 0c04: 11f8:8032 (rev 08)
> 07:00.1 0c04: 11f8:8032 (rev 08)
> 07:00.2 0c04: 11f8:8032 (rev 08)
> 07:00.3 0c04: 11f8:8032 (rev 08)
>
> DomU:
> kaan-18-dpm:~# lspci -n
> 00:00.0 0c04: 11f8:8032 (rev 08)
> 00:00.1 0c04: 11f8:8032 (rev 08)
> 00:00.2 0c04: 11f8:8032 (rev 08)
> 00:00.3 0c04: 11f8:8032 (rev 08)
>
>
> -Ray
>
> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Wednesday, October 13, 2010 11:52 AM
> To: Lin, Ray
> Cc: bruce.edge@xxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: PCI devices remap from dom0 to domU with pv-ops kernel
>
> On Wed, Oct 13, 2010 at 10:49:12AM -0600, Lin, Ray wrote:
> >
> > Konrad,
> >
> > We try to remap the pci devices from dom0 to domU by assigning the
> > pci in the domU configuration file. Such as
> >
> > pci="['01:00.0@11', '01:00.1@10', '04:00.0@13', '04:00.1@12']"
> >
> > In hvm kernel, the domU would see the pci devices remapped like this,
> >
> > dom0 pci device 01:00.0 => domU pci device 00:11.0
> > dom0 pci device 01:00.1 => domU pci device 00:10.0
> > dom0 pci device 04:00.0 => domU pci device 00:13.0
> > dom0 pci device 04:00.1 => domU pci device 00:12.0
> >
> > But pv-ops kernel seems ignore the remapping. Is there any way (kernel
> > configuration setting ??) to make it work ?
>
> Not completly.
>
> When you compile your Xen PCI backend, you should see an option whether you
> want Virtual PCI, Passthrough or some other type. By default it will pick the
> Virtual one so that it just enumerates from zero the PCI devices. You could
> write your own plugin that would do remaping per your desire.
> >
> > Thanks,
> > Ray
> >
> >
>
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