RE: [Xen-devel] Xen 4.0.0-rc7 problem/hang with vt-d DMAR parsing

["Nadolski, Ed" <Ed.Nadolski@xxxxxxx>]

> > I'm also seeing a hang on boot with 4.0.0-rc7, but I am not clear if
> this is the same issue.  Here is the tail end of the trace:
> >
> > [    4.802862] NetLabel:  unlabeled traffic allowed by default
> > [    4.808653] DMAR:Host address width 40
> > [    4.812310] DMAR:DRHD base: 0x000000dfffe000 flags: 0x0
> > [    4.817604] IOMMU dfffe000: ver 1:0 cap c90780106f0462 ecap f020fe
> > [    4.823816] DMAR:DRHD base: 0x000000fedc0000 flags: 0x1
> > [    4.829105] IOMMU fedc0000: ver 1:0 cap c90780106f0462 ecap f020f6
> > [    4.835325] DMAR:RMRR base: 0x000000dbe58000 end: 0x000000dbe6ffff
> > [    4.841556] DMAR:ATSR flags: 0x0
> > [    4.844844] DMAR:ATSR flags: 0x0
> > [    4.848133] Not all IO-APIC's listed under remapping hardware
> > [    4.854028] IOMMU 0xdfffe000: using Queued invalidation
> > [    4.859217] IOMMU 0xfedc0000: using Queued invalidation
> > [    4.864493] IOMMU: Setting RMRR:
> > [    4.867778] IOMMU: Setting identity map for device 0000:00:1d.0
> [0xdbe58000 - 0xdbe70000]
> > [    4.876053] IOMMU: Setting identity map for device 0000:00:1d.1
> [0xdbe58000 - 0xdbe70000]
> > [    4.884264] IOMMU: Setting identity map for device 0000:00:1d.2
> [0xdbe58000 - 0xdbe70000]
> > [    4.892485] IOMMU: Setting identity map for device 0000:00:1d.7
> [0xdbe58000 - 0xdbe70000]
> > [    4.900709] IOMMU: Setting identity map for device 0000:00:1a.0
> [0xdbe58000 - 0xdbe70000]
> > [    4.908928] IOMMU: Setting identity map for device 0000:00:1a.1
> [0xdbe58000 - 0xdbe70000]
> > [    4.917150] IOMMU: Setting identity map for device 0000:00:1a.2
> [0xdbe58000 - 0xdbe70000]
> > [    4.925390] IOMMU: Setting identity map for device 0000:00:1a.7
> [0xdbe58000 - 0xdbe70000]
> > [    4.933612] IOMMU: Prepare 0-16MiB unity mapping for LPC
> > [    4.938938] IOMMU: Setting identity map for device 0000:00:1f.0
> [0x0 - 0x1000000]
> > [    4.946651] VT-d detected invalid descriptor: low=11, high=0
> >
> > Then it hangs. This is on a Dell T7500 quad-core Xeon with the latest
> Dell BIOS (rev. A03).  Should I try the suggested patch, or any
> particular command line or build options? Should I dump the DMAR
> tables?
> >
> Your issue is different. It's caused by enabling VT-d in pv-ops dom0.
> but pv-ops dom0 should not see DMAR table because its signature is
> zapped after xen enables it.  Pls have a try with turn off VT-d in
> pvops config (# CONFIG_DMAR is not set) , it should solve your issue. But we
> need to find why pv-ops dom0 still sees DMAR table in ACPI. Pls dump
> DMAR tables.

Changing CONFIG_DMAR as you say fixes the hang. I've also attached the DMAR 
table dump as you requested, does this look OK?

Thanks again,
Ed

DellT7500_BIOS_A03-dmar.bin
Description: DellT7500_BIOS_A03-dmar.bin

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