From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF516C433DB for ; Fri, 5 Mar 2021 06:40:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE13365013 for ; Fri, 5 Mar 2021 06:40:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229446AbhCEGkn (ORCPT ); Fri, 5 Mar 2021 01:40:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229457AbhCEGkm (ORCPT ); Fri, 5 Mar 2021 01:40:42 -0500 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7AA42C061574 for ; Thu, 4 Mar 2021 22:40:42 -0800 (PST) Received: by mail-ed1-x536.google.com with SMTP id t1so1064901eds.7 for ; Thu, 04 Mar 2021 22:40:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=rlMC+NCGohYrtFUT53MyD25UTkSWavgfcRQFGg665gM=; b=Ag8fIkp03HMTSaamJkFp+Y81vzhcHicjzhao/hF3vJfen6XB7xJVjN29P84N/9iOSq l4x7K2LT/HajdOO0BpWJTJZEvU6PF14LQAl3hkXTCvtnB9k3TpKkS6eQl5XmBKQVNwOs rEv03bM6DNcxZ6bwu4kVTuwnAEkFxDBpKveGRaQZP0r8/lcfFCMnLBj6hLD076FbHCsg ebCPHp4+lsbvrPpNUSS469QK2vavzSqng7ENofCfX0ivBsbgqY26SSuWDjwYtdVazoUh 4+qIvpwwjvoF09nE7JHFtNhBu8I5ZLqyTEKs+wd/stos/KWYfHnI7xVfatAviDWSMZBD r2gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=rlMC+NCGohYrtFUT53MyD25UTkSWavgfcRQFGg665gM=; b=gzLWMVZSZ1oLf+P9CeUZvP4CULmDI+FtEAp/vy/Vo4x+ZLSJWFmu25zPhCVXevGZyg M4stAEn5aQ5xTJQd/QcsQe7H0Z5ZfSp4Mk/+TlK1zcStE72K6wiV7m5x5aPZN8ap9sFB bZpIcT5jAbZXKP1EUEXZwJovp9rNelfeZfC39bMNRNEHu+k9shwctVwkBsWwM3t9+zmZ ALkNcx1I7/tJtHnJGwfvg/gDqvSZbDEWLHzL0T3wI9pDRe6+h8n/SupK/nP0AoZ+vfgO UOYQlaQOxX3vhnhNqWahjuS9BBIQgEm0zQ79wjK6ieCHYFYW7qE0oWV8kqpFUks47UUX ILdA== X-Gm-Message-State: AOAM5303dUGBWH8hWEkEVR3Ge8SRIXHE1kTrLVUhF3OfdBOV6Qkkkiy1 ioEZX139RbwvUqnl89pfcdmypZfW4Huff5jIzonK X-Google-Smtp-Source: ABdhPJzy5l34Guxnd+JnxGnP9wmnYZwXADgIwoxPy+rQTvVYIIU8FE3hOZyBcfpxFKrrWwJEObadHitMMyKFHiaqQ8o= X-Received: by 2002:a05:6402:180b:: with SMTP id g11mr7686614edy.195.1614926441210; Thu, 04 Mar 2021 22:40:41 -0800 (PST) MIME-Version: 1.0 References: <20210223115048.435-1-xieyongji@bytedance.com> <20210223115048.435-12-xieyongji@bytedance.com> <86af7b84-23f0-dca7-183b-e4d586cbcea6@redhat.com> <845bfa68-2ece-81a2-317f-3e0cf4f72cf1@redhat.com> In-Reply-To: <845bfa68-2ece-81a2-317f-3e0cf4f72cf1@redhat.com> From: Yongji Xie Date: Fri, 5 Mar 2021 14:40:30 +0800 Message-ID: Subject: Re: Re: [RFC v4 11/11] vduse: Support binding irq to the specified cpu To: Jason Wang Cc: "Michael S. Tsirkin" , Stefan Hajnoczi , Stefano Garzarella , Parav Pandit , Bob Liu , Christoph Hellwig , Randy Dunlap , Matthew Wilcox , viro@zeniv.linux.org.uk, Jens Axboe , bcrl@kvack.org, Jonathan Corbet , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Mar 5, 2021 at 11:44 AM Jason Wang wrote: > > > On 2021/3/5 11:37 =E4=B8=8A=E5=8D=88, Yongji Xie wrote: > > On Fri, Mar 5, 2021 at 11:11 AM Jason Wang wrote: > >> > >> On 2021/3/4 4:19 =E4=B8=8B=E5=8D=88, Yongji Xie wrote: > >>> On Thu, Mar 4, 2021 at 3:30 PM Jason Wang wrote= : > >>>> On 2021/2/23 7:50 =E4=B8=8B=E5=8D=88, 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