Re: [Xen-devel] New DMAR errors in Xen 4.1

[Weidong Han <weidong.han@xxxxxxxxx>]

Jeremy Fitzhardinge wrote:
> On 04/06/2010 03:38 PM, Jeremy Fitzhardinge wrote:
>   
> > I'm seeing DMAR errors with current Xen-unstable, which weren't there 
> > in -rc8 (-rc9?):
> > type=1403 audit(1270593095.214:3): policy loaded auid=4294967295 
> > ses=4294967295
> > (XEN) [VT-D]iommu.c:821: iommu_fault_status: Primary Pending Fault
> > (XEN) [VT-D]iommu.c:796: DMAR:[DMA Write] Request device [00:1f.2] 
> > fault addr bf57b000, iommu reg = ffff82c3fff57000
> > (XEN) DMAR:[fault reason 05h] PTE Write access is not set
> > (XEN) print_vtd_entries: iommu = ffff83013fff3e80 bdf = 0:1f.2 gmfn = 
> > bf57b
> > (XEN)     root_entry = ffff83013ff36000
> > (XEN)     root_entry[0] = 13c6bb001
> > (XEN)     context = ffff83013c6bb000
> > (XEN)     context[fa] = 2_13fec4001
> > (XEN)     l4 = ffff83013fec4000
> > (XEN)     l4_index = 0
> > (XEN)     l4[0] = 13fec1003
> > (XEN)     l3 = ffff83013fec1000
> > (XEN)     l3_index = 2
> > (XEN)     l3[2] = 13ccbe003
> > (XEN)     l2 = ffff83013ccbe000
> > (XEN)     l2_index = 1fa
> > (XEN)     l2[1fa] = 13cac3003
> > (XEN)     l1 = ffff83013cac3000
> > (XEN)     l1_index = 17b
> > (XEN)     l1[17b] = 0
> > (XEN)     l1[17b] not present
> > (XEN) [VT-D]iommu.c:796: DMAR:[DMA Write] Request device [00:1f.2] 
> > fault addr bf57a000, iommu reg = ffff82c3fff57000
> > (XEN) DMAR:[fault reason 05h] PTE Write access is not set
> > (XEN) print_vtd_entries: iommu = ffff83013fff3e80 bdf = 0:1f.2 gmfn = 
> > bf57a
> > (XEN)     root_entry = ffff83013ff36000
> > (XEN)     root_entry[0] = 13c6bb001
> > (XEN)     context = ffff83013c6bb000
> > (XEN)     context[fa] = 2_13fec4001
> > (XEN)     l4 = ffff83013fec4000
> > (XEN)     l4_index = 0
> > (XEN)     l4[0] = 13fec1003
> > (XEN)     l3 = ffff83013fec1000
> > (XEN)     l3_index = 2
> > (XEN)     l3[2] = 13ccbe003
> > (XEN)     l2 = ffff83013ccbe000
> > (XEN)     l2_index = 1fa
> > (XEN)     l2[1fa] = 13cac3003
> > (XEN)     l1 = ffff83013cac3000
> > (XEN)     l1_index = 17a
> > (XEN)     l1[17a] = 0
> > (XEN)     l1[17a] not present
> >
> >
> >
> > Device 0:1f.2 is my SATA controller.  I haven't tried bisecting it or 
> > anything yet; I don't see any recent changes which are obviously 
> > relevant though.
> >     
> It turns out its... "Enable debug=y by default in the build."  So I 
> guess these errors have been happening silently thus far?
>      J
>   
I don't encounter this issue. These DMAR fault messages will be printed 
even when debug=n. what platform are you using? could you post complete 
booting log with "iommu=verbose"?
Regards,
Weidong

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