[Xen-devel] dom0 crashes while domain_pause in NPF handler

["Ding, ShengGe" <ShengGe.Ding@xxxxxxx>]

Hi all,

 

I ran into trouble on nested page fault handling.

 

I removed p2m entries of passthrough type via clear_mmio_p2m_entry() to unmap mmio space of passthough HW.

Then the nested page fault of physical mmio space can be trapped and the domU can be paused here via domain_pause().

 

These are fine in xen-4.1.1 with debian patch(ubuntu).

But while I try to port them to xen-unstable version, the dom0 crashes.

 

The paused domain is absolutely domU. Is there any new restriction in NPF handler in unstable version?

 

Thanks!

ShengGe

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