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

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

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.