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RE: [Xen-devel] 82576 VF passthrough
I remember the VF driver need hook for configuration space
access. For example, the BAR is 0 by default. Not sure if that's the reason.
--jyh
I've only ever used HVMs. I can't say whether VF
passthrough to a PV guest works or not but I can't think of any reason it
wouldn't. Can you pass other devices through to this PV guest? If
so then a VF should work also. Generally any guest that you can a
physical device through will also work with a VF device.
Next thing to consider is whether your BIOS supports
SR-IOV. There are a lot of machines that have the necessary HW to
support SR-IOV but the BIOS does not properly detect SR-IOV capable devices
and program the upstream switches and bridges properly to make sure the I/O
aperture is large enough to accommodate the extra VF devices when they
are enabled by the driver. There are very few BIOS vendors shipping
SR-IOV capable BIOS at the moment. If your machine does not have the
right BIOS then there is a work around in the Xen 3.4 release that you can
use. Or at least I think it's still there.
pci=assign-mmio=0000:01
Try
adding that to your kernel command line but substitute the domain/bus of your
device. For instance if your Kawela is on bus 4 then you would change
the command to pci=assign-mmio=0000:04.
Hope
that helps.
-
Greg
Hi Greg,
I am using Vt-d machine. Sorry for the
confusion.
My Hardware is HP dc7800p Chipset: Q35, with Intel Core
2 Duo E8400 processor. NIC Card is 82576 E1G42ET (dual port RJ-45
copper).
Is VF passthrough can be done only to HVM guest? Is VF
passthrough to paravirtal guest is
supported?
Regards,
-Satish
On Fri, Sep 25, 2009 at 10:36 AM, Rose, Gregory V
<gregory.v.rose@xxxxxxxxx>
wrote:
>Subject: Re: [Xen-devel] 82576 VF
passthrough
>
>On Thu, Sep 24, 2009 at 12:26:25AM +0530, Satish
Chowdhury wrote:
>> Hi,
>>
>> I am trying to
setup 82576 VF passthrough to pv domU non
>Vt-d
machine
You can't run SR-IOV VF devices in VM guests on a non
Vt-d machine. VT-d is required for VF passthrough to a
guest.
- Greg
LAD
Intel
Corp.
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