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

[Yongji Xie <xieyongji@bytedance.com>]

On Fri, Mar 5, 2021 at 11:44 AM Jason Wang <jasowang@redhat.com> wrote:
>
>
> On 2021/3/5 11:37 上午, Yongji Xie wrote:
> > On Fri, Mar 5, 2021 at 11:11 AM Jason Wang <jasowang@redhat.com> wrote:
> >>
> >> On 2021/3/4 4:19 下午, Yongji Xie wrote:
> >>> On Thu, Mar 4, 2021 at 3:30 PM Jason Wang <jasowang@redhat.com> wrote:
> >>>> On 2021/2/23 7:50 下午, Xie Yongji wrote:
> >>>>> 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).
>

OK, I see. I think we don't allow that now.

Thanks,
Yongji