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Re: [Xen-users] PCI Passthrough for Windows error

To: deshantm@xxxxxxxxx
Subject: Re: [Xen-users] PCI Passthrough for Windows error
From: "billy lau" <billylau@xxxxxxxxx>
Date: Tue, 11 Nov 2008 15:16:29 -0500
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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On Tue, Nov 11, 2008 at 3:13 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:
On Tue, Nov 11, 2008 at 3:09 PM, billy lau <billylau@xxxxxxxxx> wrote:
> On Tue, Nov 11, 2008 at 3:03 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:
>> On Tue, Nov 11, 2008 at 2:47 PM, billy lau <billylau@xxxxxxxxx> wrote:
>> > Hi, sorry, it took me quite a while, because I was trying other ways to
>> > get
>> > around htis prblem, but it seems like I cannot get pass this.
>> >
>> > Attached is the output from
>> > lspci -tv
>> > lspci -xxx -vvv
>> > xm pci-list-assignable-devices returns nothing
>> > ls /sys/bus/pci/drivers/pciback*
>> > grep hide /boot/grub/menu.lst
>> >
>> > The Linux guest taht worked before was PV.
>> >
>> > xm dmesg shows
>> > (XEN) HVM: VMX enabled
>> > and
>> > (XEN) I/O virtualisation disabled
>> > (XEN) Xen trace buffers: disabled
>> >
>> > I'm not sure if this means iommu is disabled. If it is, what should I do
>> > to
>> > enable it? Thanks,
>> > - billy
>> >
>> There is a separate bios option to enable the IOMMU (VT-d) (IO
>> virtualization support)
>> Did you verify that your Chipset support VT-d? That is the first step.
> Yeah, I made sure that in my bios, under performance, virtualization is
> turned on, and also IOMMU is turned on. My chipset is Intel(R) Xeon(R) E5430
> @ 2.66GHz. I googled that up, it supports VT-d. What do you mean by a
> _separate_ bios option?

VT (virtualization support) has a bios option, VT-d (IO virtualizaiton) has

I see. Yes, I have confirmed that both options are on in the bios.

Did you turn the computer off (not just restart) after setting that option?


The xm dmesg should show that I/O virtualization is enabled.

Doing another xm dmesg, it still shows (XEN) I/O virtualisation disabled. Any other thoughts on how to turn it on?

- billy

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