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RE: [Xen-devel] Latest Pv_ops dom0 fails to boot

Jeremy Fitzhardinge wrote:
> On 10/27/09 20:03, Zhang, Xiantao wrote:
>> Seems it is caused by newly-introduced
>> hypercall(VCPUOP_register_vcpu_time_memory_area) for setting memory
>> area for vcpu time.  Try the following patch(Just disable
>> Xen_TIM_VSYSCALL) to have a try.   
> Are you saying that if that hypercall hasn't been implemented it
> crashes?  Hm, will double-check.  It's certainly supposed to just
> fall back. 

No. If hypervisor doesn't support the hypercall, it just return -ENOSYS, and 
dom0 can work well. But after implementing the hypercall in the 
hypervisor(Cset#20339), both dom0 and hypervisor all performs correpsonding 
actions in this case, so issues happen. That is to say, if disable this 
hypercall either in hypervisor or in dom0, it should work, but if enable both, 
the issue occurs. So it should be caused by incorrect hypercall implementation 
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