Re: [Xen-devel] Xen 4.0 + PVOPS + Intel VTD + USB EHCI = BUG()

["David P. Quigley" <dpquigl@xxxxxxxxxxxxx>]

On Thu, 2010-02-04 at 09:59 +0800, Weidong Han wrote:
> David P. Quigley wrote:
> > On Wed, 2010-02-03 at 11:08 +0800, Weidong Han wrote:
> >   
> >> David P. Quigley wrote:
> >>     
> >>> On Sat, 2010-01-30 at 21:50 +0800, Han, Weidong wrote:
> >>>   
> >>>       
> >>>> It's so weird pvops dom0 still detects DMAR and enables it after zap 
> >>>> DMAR signature in Xen. Dom0 should not detect DMAR in ACPI after the 
> >>>> signature is zapped. 
> >>>>
> >>>> I suspect that your USB issue is caused by this. Pls have a try with 
> >>>> turn off VT-d in pvops config (# CONFIG_DMAR is not set) to see if it 
> >>>> solves your issue.
> >>>>
> >>>> Regards,
> >>>> Weidong
> >>>>
> >>>> -----Original Message-----
> >>>> From: David P. Quigley [mailto:dpquigl@xxxxxxxxxxxxx] 
> >>>> Sent: Friday, January 29, 2010 12:10 AM
> >>>> To: Han, Weidong
> >>>> Cc: Pasi KÃrkkÃinen; Daniel Stodden; xen-devel@xxxxxxxxxxxxxxxxxxx; 
> >>>> Konrad Rzeszutek Wilk
> >>>> Subject: RE: [Xen-devel] Xen 4.0 + PVOPS + Intel VTD + USB EHCI = BUG()
> >>>>
> >>>> I've attached the output from the patched xen hypervisor. I see the 
> >>>> message being printed out so it appears to be clearing the signature.
> >>>>
> >>>> Dave
> >>>>     
> >>>>         
> >>> So I managed to sucessfully book my pvops dom0 kernel with VT-D on in my
> >>> bios when I turned off DMAR from the dom0 kernel config. Is there
> >>> anything else you would like me to do to help hunt this bug down?
> >>>
> >>> Dave
> >>>
> >>>   
> >>>       
> >> Could you dump ACPI in native Linux and Xen dom0? Let's see what 
> >> difference between "zap" and "no zap" DMAR signature.
> >>
> >> Regards,
> >> Weidong
> >>     
> >
> > Sure. How do I go about doing that?
> >
> > Dave
> >
> >   
> You can search and download acpidump. After install it, you can use 
> following command to dump acpi table:
> 
> acpidump >acpidump.txt
> 
> Dump acpi table on both native Linux and xen dom0, and post dump files.
> 
> Regards,
> Weidong

I seem to have run into a problem. My dom0 kernel no longer boots as a
stand alone kernel. It will only boot on top of Xen. I'll try to figure
this out and I'll post the results when I do.

Dave


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