Re: [RFC v4 11/11] vduse: Support binding irq to the specified cpu

On 2021/3/5 11:37 上午, Yongji Xie wrote:

On Fri, Mar 5, 2021 at 11:11 AM Jason Wang [off-list ref] wrote:

quoted

On 2021/3/4 4:19 下午, Yongji Xie wrote:

quoted

On Thu, Mar 4, 2021 at 3:30 PM Jason Wang [off-list ref] wrote:

quoted

On 2021/2/23 7:50 下午, Xie Yongji wrote:

quoted

Add a parameter for the ioctl VDUSE_INJECT_VQ_IRQ to support
injecting virtqueue's interrupt to the specified cpu.

How userspace know which CPU is this irq for? It looks to me we need to
do it at different level.

E.g introduce some API in sys to allow admin to tune for that.

But I think we can do that in antoher patch on top of this series.

OK. I will think more about it.

It should be soemthing like
/sys/class/vduse/$dev_name/vq/0/irq_affinity. Also need to make sure
eventfd could not be reused.

Looks like we doesn't use eventfd now. Do you mean we need to use
eventfd in this case?

No, I meant if we're using eventfd, do we allow a single eventfd to be used for injecting irq for more than one virtqueue? (If not, I guess it should be ok).

Thanks

Thanks,
Yongji