Re: [Xen-devel] trying to get vt-d working with xen 4.0.0 stable + 2.6.32.10 pvops kernel with .config file from the

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sat, Apr 24, 2010 at 08:08:56PM +0000, c4pt4inkrunch@xxxxxxxxx wrote:
> here is my xm dmesg i was wondering if anyone knew about these DMAR  

.. snip..
> (XEN) [VT-D]iommu.c:1078: drhd->address = fe71a000 iommu->reg = fff17000
> (XEN) [VT-D]iommu.c:1080: cap = ffffffffffffffff ecap = ffffffffffffffff
> (XEN) [VT-D]iommu.c:1086: IOMMU: unsupported

Line 1086.

1083     if ( cap_fault_reg_offset(iommu->cap) +
1084          cap_num_fault_regs(iommu->cap) * PRIMARY_FAULT_REG_LEN >=
PAGE_SIZE ||
1085          ecap_iotlb_offset(iommu->ecap) >= PAGE_SIZE )
1086     {


The iommu->cap and iommu->ecap are used. And as you can see below
the values are all 0xfffffffffffffffff which are pretty bogus.

> (XEN) ---- print_iommu_regs ----
> (XEN) drhd->address = fe71a000
> (XEN) VER = ffffffff
> (XEN) CAP = ffffffffffffffff
> (XEN) n_fault_reg = 100
> (XEN) fault_recording_offset = 3ff0
> (XEN) ECAP = ffffffffffffffff
> (XEN) GCMD = ffffffff
> (XEN) GSTS = ffffffff
> (XEN) RTADDR = ffffffffffffffff
> (XEN) CCMD = ffffffffffffffff
> (XEN) FSTS = ffffffff
> (XEN) FECTL = ffffffff
> (XEN) FEDATA = ffffffff
> (XEN) FEADDR = ffffffff
> (XEN) FEUADDR = ffffffff
> (XEN) I/O virtualisation disabled
> (XEN) Total of 8 processors activated.

Looks to me that your hardware isn't working right.

So to fix this, please follow this link:

"Intel developers also want to know about broken IOMMU/VT-d BIOS
implementations, see this email:
+http://lists.xensource.com/archives/html/xen-devel/2010-01/msg00841.html,
so let them know all the details about your hardware and
+software if you have broken BIOS. "


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