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?
Just at first glance to fault address, this seems be issued from some
known erratas on BDS and SKL.
Thanks
Tiejun
The device in question is an integrated Intel graphics card:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
The only way I found to stop the messages from making my serial connection
useless was by assigning the device to xen-pciback.
Cheers,
Tamas
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