Anthony Liguori wrote:
> Dong, Eddie wrote:
>> In this case, IOCTL return to Qemu will trigger scheduling at least.
>> 
> 
> I think a scheduling change won't happen until the next timer tick.
> AFAICT, there's nothing explicit in the ioctl return path that will
> result in rescheduling.

Do u mean Linux system call (IOCTL here) will not do scheudling check?
(check TIF_NEED_RESCHED flag)

Also another chance is vcpu_put() in kvm_vcpu_ioctl_run that
will trigger rescheduling check IMO.

Thx, eddie

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