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

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

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 Kärkkäinen; 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


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