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

["billy lau" <billylau@xxxxxxxxx>]

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
another.

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?

Yes.
 

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?

thanks,
- billy

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