Re: [Xen-devel] PVH Dom0 Intel IOMMU issues

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Roger Pau Monné [mailto:roger.pau@xxxxxxxxxx]
> Sent: Friday, April 14, 2017 11:35 PM
> 
> Hello,
> 
> Although PVHv2 Dom0 is not yet finished, I've been trying the current code
> on
> different hardware, and found that with pre-Haswell Intel hardware PVHv2
> Dom0
> completely freezes the box when calling iommu_hwdom_init in
> dom0_construct_pvh.
> OTOH the same doesn't happen when using a newer CPU (ie: haswell or
> newer).
> 
> I'm not able to debug that in any meaningful way because the box seems to
> lock
> up completely, even the watchdog NMI stops working. Here is the boot log,
> up to
> the point where it freezes:
> 

I don't have an idea now w/o seeing more meaningful debug message.
Maybe you have to add more fine-grained prints to capture some
useful hints.

Thanks
Kevin

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