Re: [Xen-devel] Memory mapping for PEG/PCIe Graphics Passthrough to <any> DomU

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 07, 2010 at 08:14:47AM -0800, Fantu wrote:
> 
> i have grub2 also here and i have add dummy=foo before root...
> 
> xm dmesg
> ])
> (XEN) [VT-D]dmar.c:548: Host address width 39
> (XEN) [VT-D]dmar.c:557: found ACPI_DMAR_DRHD:
> (XEN) [VT-D]dmar.c:374:   dmaru->address = fbfff000
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1b.0
> (XEN) [VT-D]dmar.c:557: found ACPI_DMAR_DRHD:
> (XEN) [VT-D]dmar.c:374:   dmaru->address = fbffe000
> (XEN) [VT-D]dmar.c:331:   IOAPIC: f0:1f.7
> (XEN) [VT-D]dmar.c:331:   IOAPIC: 0:13.0
> (XEN) [VT-D]dmar.c:386:   flags: INCLUDE_ALL
> (XEN) [VT-D]dmar.c:561: found ACPI_DMAR_RMRR:
> (XEN) [VT-D]dmar.c:446:   RMRR region: base_addr ec000 end_address effff
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1d.0
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1d.1
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1d.2
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1d.7
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1a.0
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1a.1
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1a.2
> (XEN) [VT-D]dmar.c:326:   endpoint: 0:1a.7
> (XEN) [VT-D]dmar.c:561: found ACPI_DMAR_RMRR:
> (XEN) [VT-D]dmar.c:417: RMRR error: base_addr bf7dc000 end_address bf7dbfff
> (XEN) Failed to parse ACPI DMAR.  Disabling VT-d.
>

This looks like you have a buggy BIOS, it doesn't have correct DMAR RMRR table..

When RMRR address range is not in reserved memory (BIOS issue), can use
'iommu_inclusive_mapping=1' to work around it. 

So try that options for xen.gz in grub config.

http://wiki.xensource.com/xenwiki/VTdHowTo

-- Pasi


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