RE: [Xen-ia64-devel] Some things to be considered for ptc.ga emulation

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

>From: Xu, Anthony
>Sent: 2006年4月5日 13:56
>
>
>Considering VTIdomain, I have below concerns,
>If a vcpu receives a IPI, just before do_block( waiting device model
>on dom0 to handle IO request), do_block will schedule out this vcpu,
>and the schedule in vcpu may use the old tlb mapping.
>And the wait maybe long.

Yes, we need more thinking on this specific case...

>
>
>Moreover, if this IO request is sent to the vcpu of domain0, which runs
>On the same vcpu that send out IPI, because this vcpu is waiting other
>Vcpus' response of IPI handling, it can't be scheduled to vcpu of
>domain0,
>Then dead loop happens.
>
>The vcpu that sends IPI should not wait by tight polling, this vcpu should
>yield
>LP and poll.
>

Yes, 'wait' shouldn't be polling, which is instead yield. :-)

Thanks,
Kevin

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