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

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

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


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