Re: [Xen-devel] [PATCH] Remove a set operation for VCPU_KICK_SOFTIRQ when post interrupt to vm.

["Liuqiming (John)" <john.liuqiming@xxxxxxxxxx>]

On 2015/10/10 14:32, Zhang, Yang Z wrote:
> Zhang, Yang Z wrote on 2015-09-24:
> > Liuqiming (John) wrote on 2015-09-24:
> > > On 2015/9/24 11:25, Zhang, Yang Z wrote:
> > > it completed, the following vmentry will pick up the pending interrupt.
> > > If you send the ipi unconditionally, actually it is received by
> > > hypervisor and the interrupt handler dose nothing. You still rely on
> > > the vmentry to pick up the interrupt. My confusion is:  when
> > > vmentry, does physical CPU inject all interrupts on PIR into VM and
> > > clear POSTED_INTR_ON bit? Or just inject the highest index of PIR
> > > and may leave POSTED_INTR_ON bit being set to 1?
> > I need to say your understanding is wrong. What we need to do is sync
> > the pir to irr and let hardware or hypervisor to handle left part. So
> > our focus is how to sync pir to irr correctly and timely. We don't
> > care how the interrupt in PIR is injected to guest.
> Hi Qiming, is there any other question with it? Also, do you have any chance to 
> test it?
>
> Best regards,
> Yang
  No other question.
  I have run some vm start-shutdown test, and haven't gotten a chance 
to test the performance.





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