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

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Date:   Fri, 5 Mar 2021 14:40:30 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Parav Pandit <parav@...dia.com>, Bob Liu <bob.liu@...cle.com>,
        Christoph Hellwig <hch@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk,
        Jens Axboe <axboe@...nel.dk>, bcrl@...ck.org,
        Jonathan Corbet <corbet@....net>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: Re: [RFC v4 11/11] vduse: Support binding irq to the specified cpu

On Fri, Mar 5, 2021 at 11:44 AM Jason Wang <jasowang@...hat.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@...hat.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@...hat.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