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

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of Konrad Rzeszutek Wilk
> Sent: Wednesday, December 2, 2015 12:16 AM
> To: Tian, Kevin <kevin.tian@xxxxxxxxx>; Wu, Feng <feng.wu@xxxxxxxxx>
> Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>; Xen-devel <xen-
> devel@xxxxxxxxxxxxx>; Tamas K Lengyel <tamas.k.lengyel@xxxxxxxxx>
> Subject: Re: [Xen-devel] VT-d faults with Integrated Intel graphics on 4.6
> 
> On Thu, Aug 27, 2015 at 07:03:56AM -0400, Konrad Rzeszutek Wilk wrote:
> > On Thu, Aug 27, 2015 at 11:06:30AM +0800, Chen, Tiejun wrote:
> > > On 8/25/2015 10:43 PM, 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
> > > >>>...
> > > >>>
> > > >>
> > > >>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
> > >
> > > As you see those fault addresses are out of the normal memory range
> here.
> > >
> > > >>known erratas on BDS and SKL.
> > > >
> > > >I am runnig v4.2-rc8.
> > >
> > > So I really doubt this is related to some erratas. Currently the pre-fetch
> > > unit of IOMMU unit dedicated to IGD can't work well on some platforms,
> so
> > > you can see these wired faults.
> >
> > Do you have some ideas for a solution/patch?
> 
> ping?
> 
> Should I use some work-around flags? There does not seem to be any
> corruption on the AMT screen - just that the 'xl dmesg' is packed with
> VT-d faults.
> 
> Attaching the lspci, dmesg, xl dmesg, from the latest Xen.
> 

Tiejun left Intel, adding Shuai here who may help.

Thanks,
Feng

> >
> > Thanks!

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel