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

[Weidong Han <weidong.han@xxxxxxxxx>]

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


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