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

[Tim Deegan <tim@xxxxxxx>]

Hi,

At 05:25 +0000 on 18 Sep (1347945907), Ding, ShengGe wrote:
> Hi all,
> 
> I checked the domain_id again and I'm sure the paused domain is domU.
> But the crashing seems like dom0 is paused, then whole system is killed and 
> reboots.
> 
> In Nested page fault handler, hypervisor get the VCPU via current macro and 
> this VCPU is bound to domU(the domain_id is so).
> I'm really confused, how does dom0 crash if I pause domU here? Maybe this is 
> a logic issue of hypervisor, the same codes could run well in old version.
> 

You haven't given enough information to understand what's gone wrong. 

What do you mean my 'dom0 crashes'?  Can you post a log of the serial
console of the machine showing the actual crash?

What changes have you made to Xen?  If your patches are very small,
maybe you could post them; if not, at least a description of what you've
done would be a good idea.

Calling domain_pause() on domU from inside a domU fault handler is
probably unsafe -- if two vcpus take the fault at the same time they
might deadlock. 

Tim.


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