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

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

On Wed, Aug 26, 2015 at 05:19:39PM +0100, Malcolm Crossley wrote:
> On 25/08/15 15:43, Konrad Rzeszutek Wilk 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
> >>> ...
> >>>
> >>
> 
> I think this problem is caused by missing IOMMU mappings for the RMRR regions
> if the domain does not have shared EPT enabled. This includes PV Dom 0.
> 
> I have posted a patch to fix the issue:
> 
> http://lists.xen.org/archives/html/xen-devel/2015-08/msg02090.html

No dice. Still seeing the same problem :-(

> 
> 
> 
> >> 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             /DQ67SW, BIOS
> > SWQ6710H.86A.0066.2012.1105.1504 11/05/2012
> > 
> > There is no guest OS - this is initial domain. And I boot with 2GB:
> >  Released 0 page(s)
> > 
> > Xen: [mem 0x0000000000000000-0x0000000000099fff] usable
> > Xen: [mem 0x000000000009a800-0x00000000000fffff] reserved
> > Xen: [mem 0x0000000000100000-0x000000001fffffff] usable
> > Xen: [mem 0x0000000020000000-0x00000000201fffff] reserved
> > Xen: [mem 0x0000000020200000-0x000000003fffffff] usable
> > Xen: [mem 0x0000000040000000-0x00000000401fffff] reserved
> > Xen: [mem 0x0000000040200000-0x0000000080465fff] usable
> > Xen: [mem 0x0000000080466000-0x000000009e855fff] unusable
> > Xen: [mem 0x000000009e856000-0x000000009e85efff] ACPI data
> > Xen: [mem 0x000000009e85f000-0x000000009e8a9fff] ACPI NVS
> > Xen: [mem 0x000000009e8aa000-0x000000009e8b1fff] unusable
> > Xen: [mem 0x000000009e8b2000-0x000000009e9a4fff] reserved
> > Xen: [mem 0x000000009e9a5000-0x000000009e9a6fff] unusable
> > Xen: [mem 0x000000009e9a7000-0x000000009ebc5fff] reserved
> > Xen: [mem 0x000000009ebc6000-0x000000009ebc6fff] unusable
> > Xen: [mem 0x000000009ebc7000-0x000000009ebd6fff] reserved
> > Xen: [mem 0x000000009ebd7000-0x000000009ebf4fff] ACPI NVS
> > Xen: [mem 0x000000009ebf5000-0x000000009ec18fff] reserved
> > Xen: [mem 0x000000009ec19000-0x000000009ec5bfff] ACPI NVS
> > Xen: [mem 0x000000009ec5c000-0x000000009ee7bfff] reserved
> > Xen: [mem 0x000000009ee7c000-0x000000009effffff] unusable
> > Xen: [mem 0x000000009f800000-0x00000000bf9fffff] reserved
> > Xen: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
> > Xen: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
> > Xen: [mem 0x00000000fed90000-0x00000000fed91fff] reserved
> > Xen: [mem 0x00000000fee00000-0x00000000feefffff] reserved
> > Xen: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
> > Xen: [mem 0x0000000100000000-0x000000043e5fffff] unusable
> > 
> >>
> >> Just at first glance to fault address, this seems be issued from some 
> >> known erratas on BDS and SKL.
> > 
> > I am runnig v4.2-rc8.
> >>
> >> 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)
> > 
> > Same device..
> 
> This is a sandy bridge device which doesn't support shared EPT for GPU device.
> 
> 
> >>>
> >>> The only way I found to stop the messages from making my serial connection
> >>> useless was by assigning the device to xen-pciback.
> 
> This will cause the GPU to be reset and the reset stopped the GPU accessing 
> the
> RMRR region.
> 
> >>>
> >>> Cheers,
> >>> Tamas
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Xen-devel mailing list
> >>> Xen-devel@xxxxxxxxxxxxx
> >>> http://lists.xen.org/xen-devel
> >>>
> >>
> >> _______________________________________________
> >> Xen-devel mailing list
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> >> http://lists.xen.org/xen-devel
> > 
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> > 
> 
> 
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