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

[Weidong Han <weidong.han@xxxxxxxxx>]

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


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