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Date:   Wed, 5 Aug 2020 10:16:16 +0800
From:   Jason Wang <>
To:     "Michael S. Tsirkin" <>
Cc:     "Zhu, Lingshan" <>,,,,,,,,,,
Subject: Re: [PATCH V5 1/6] vhost: introduce vhost_vring_call

On 2020/8/4 下午5:21, Michael S. Tsirkin wrote:
>>>>>    +struct vhost_vring_call {
>>>>> +    struct eventfd_ctx *ctx;
>>>>> +    struct irq_bypass_producer producer;
>>>>> +    spinlock_t ctx_lock;
>>>> It's not clear to me why we need ctx_lock here.
>>>> Thanks
>>> Hi Jason,
>>> we use this lock to protect the eventfd_ctx and irq from race conditions,
>> We don't support irq notification from vDPA device driver in this version,
>> do we still have race condition?
>> Thanks
> Jason I'm not sure what you are trying to say here.

I meant we change the API from V4 so driver won't notify us if irq is 

Then it looks to me there's no need for the ctx_lock, everyhing could be 
synchronized with vq mutex.



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