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Re: [Xen-users] vtd / pci passthru broken in 3.3?

To: "Akio Takebe" <takebe_akio@xxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] vtd / pci passthru broken in 3.3?
From: "Andrew Lyon" <andrew.lyon@xxxxxxxxx>
Date: Thu, 27 Nov 2008 16:48:11 +0000
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On Thu, Nov 27, 2008 at 1:40 PM, Akio Takebe <takebe_akio@xxxxxxxxxxxxxx> wrote:
> Hi,
> I think iommu=1 is needed to command line.
> See the folowing howto.
> http://wiki.xensource.com/xenwiki/VTdHowTo
> Best Regards,
> Akio Takebe

That is exactly what was wrong, I added iommu=1 and I the xen dmesg
now shows "I/O virtualisation enabled"

Now I have a different problem, the device I want to pass thru is a 4
port pci usb card, it has 3 functions:

08:03.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 62)
08:03.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 62)
08:03.2 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 65)

I can pass through 08:03.0 and in my windows hvm some new VIA Rev 5
USB ports are detected and are functional, but they are usb 1.1 not
2.0, if I try to pass through 08:03.1 or 08:03.2 I get a error:

ValueError: unsupported format character ':' (0x3a) at index 6

I applied the fix for this error:
http://xenbits.xensource.com/xen-unstable.hg?rev/e2a8e3be7bfa but that
just changes the error message to:

non-page-aligned MMIO BAR found

I am not sure if this error is correct, if 08:03.0 can be passed
through successfully shouldn't the other functions on the same card
also be compatible?

I tried applying  fix_find_parent.patch from
in case the parent device was being misidentified but it didnt make
any difference.

I was reading a thread earlier that seemed to suggest that a patch has
been released which enables passthru for non-page-aligned mmio bar
devices, unfortunately firefox crashed and now I cannot find the
thread again, perhaps already in xen-unstable?



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