Re: [Xen-devel] VT-d faults with Integrated Intel graphics on 4.6

[Tamas K Lengyel <tamas.k.lengyel@xxxxxxxxx>]

On Tue, Aug 25, 2015 at 8:43 AM, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx> wrote:

On Tue, Aug 25, 2015 at 02:55:31PM +0800, Chen, Tiejun wrote:
> On 8/25/2015 8:19 AM, Tamas K Lengyel wrote:
> >Hi everyone,
> >I saw some people passingly mention this on the list before but just in
> >case it has been missed, my serial is also being spammed with the following
> >printouts with both Xen 4.6 RC1 and the latest staging build:
> >
> >...
> >(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> >33487d7000, iommu reg = ffff82c000201000
> >(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
> >(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> >33487d7000, iommu reg = ffff82c000201000
> >(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
> >(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> >33487d7000, iommu reg = ffff82c000201000
> >(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
> >(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> >33487d7000, iommu reg = ffff82c000201000
> >(XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
> >(XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
> >2610742000, iommu reg = ffff82c000201000
> >(XEN) [VT-D]DMAR: reason 07 - Next page table ptr is invalid
> >...
> >
>
> What's your platform? BDW? And how much memory is set to your guest OS?

Is see this as well. But oddly enough - only when I use the AMT feature
(normally I just use serial console on the machine).

The platform is      Â/DQ67SW, BIOS
SWQ6710H.86A.0066.2012.1105.1504 11/05/2012

Same board for mine and same BIOS version. I'm also using the serial through AMT. This is showing up for dom0 without any guests. Dom0 however has a max memory set to 4GB. This is my Xen boot param:

dom0_mem=4096M,max:4096M dom0_max_vcpus=4 dom0_vcpus_pin=true hap_1gb=false hap_2mb=false loglvl=all guest_loglvl=all sync_console console_to_ring com1=115200,8n1,amt console=com1 intel_iommu=on

Tamas

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