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=-17.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 BA6DBC433E0 for ; Thu, 28 Jan 2021 03:13:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D28064DD3 for ; Thu, 28 Jan 2021 03:13:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231178AbhA1DNo (ORCPT ); Wed, 27 Jan 2021 22:13:44 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:28232 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229716AbhA1DNe (ORCPT ); Wed, 27 Jan 2021 22:13:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611803528; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DcrTmjoadIb7p2OxWm6C9AN0UzP4YCS8NJ0a7dpGJ98=; b=iRxUA8xwPuntLKakKQke54oZ/v1F5Tfi520WXEcQ/cz0sjskvXro3pCa0F0sfUkJhNFe5q tNONq6+XX+mRRviWs46xyFphDBODMxasUQ8qEUoTySRTtUTizWvPFV9hHyJKE7O29arTI1 bzTl4l+wsGPi+n2yt4CL5XIvi8cEIfQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-482-zc4-TNbrNLWVbKrUpxayDQ-1; Wed, 27 Jan 2021 22:12:04 -0500 X-MC-Unique: zc4-TNbrNLWVbKrUpxayDQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 362EE1005586; Thu, 28 Jan 2021 03:12:02 +0000 (UTC) Received: from [10.72.12.167] (ovpn-12-167.pek2.redhat.com [10.72.12.167]) by smtp.corp.redhat.com (Postfix) with ESMTP id 649365D9E3; Thu, 28 Jan 2021 03:11:51 +0000 (UTC) Subject: Re: [RFC v3 03/11] vdpa: Remove the restriction that only supports virtio-net devices To: Stefano Garzarella Cc: Xie Yongji , mst@redhat.com, stefanha@redhat.com, parav@nvidia.com, bob.liu@oracle.com, hch@infradead.org, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org References: <20210119045920.447-1-xieyongji@bytedance.com> <20210119045920.447-4-xieyongji@bytedance.com> <310d7793-e4ff-fba3-f358-418cb64c7988@redhat.com> <20210120110832.oijcmywq7pf7psg3@steredhat> <1979cffc-240e-a9f9-b0ab-84a1f82ac81e@redhat.com> <20210127085728.j6x5yzrldp2wp55c@steredhat> From: Jason Wang Message-ID: <3cb239f5-fdd5-8311-35a0-c0f50b552521@redhat.com> Date: Thu, 28 Jan 2021 11:11:49 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210127085728.j6x5yzrldp2wp55c@steredhat> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2021/1/27 下午4:57, Stefano Garzarella wrote: > On Wed, Jan 27, 2021 at 11:33:03AM +0800, Jason Wang wrote: >> >> On 2021/1/20 下午7:08, Stefano Garzarella wrote: >>> On Wed, Jan 20, 2021 at 11:46:38AM +0800, Jason Wang wrote: >>>> >>>> On 2021/1/19 下午12:59, Xie Yongji wrote: >>>>> With VDUSE, we should be able to support all kinds of virtio devices. >>>>> >>>>> Signed-off-by: Xie Yongji >>>>> --- >>>>>  drivers/vhost/vdpa.c | 29 +++-------------------------- >>>>>  1 file changed, 3 insertions(+), 26 deletions(-) >>>>> >>>>> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c >>>>> index 29ed4173f04e..448be7875b6d 100644 >>>>> --- a/drivers/vhost/vdpa.c >>>>> +++ b/drivers/vhost/vdpa.c >>>>> @@ -22,6 +22,7 @@ >>>>>  #include >>>>>  #include >>>>>  #include >>>>> +#include >>>>>  #include "vhost.h" >>>>> @@ -185,26 +186,6 @@ static long vhost_vdpa_set_status(struct >>>>> vhost_vdpa *v, u8 __user *statusp) >>>>>      return 0; >>>>>  } >>>>> -static int vhost_vdpa_config_validate(struct vhost_vdpa *v, >>>>> -                      struct vhost_vdpa_config *c) >>>>> -{ >>>>> -    long size = 0; >>>>> - >>>>> -    switch (v->virtio_id) { >>>>> -    case VIRTIO_ID_NET: >>>>> -        size = sizeof(struct virtio_net_config); >>>>> -        break; >>>>> -    } >>>>> - >>>>> -    if (c->len == 0) >>>>> -        return -EINVAL; >>>>> - >>>>> -    if (c->len > size - c->off) >>>>> -        return -E2BIG; >>>>> - >>>>> -    return 0; >>>>> -} >>>> >>>> >>>> I think we should use a separate patch for this. >>> >>> For the vdpa-blk simulator I had the same issues and I'm adding a >>> .get_config_size() callback to vdpa devices. >>> >>> Do you think make sense or is better to remove this check in >>> vhost/vdpa, delegating the boundaries checks to >>> get_config/set_config callbacks. >> >> >> A question here. How much value could we gain from get_config_size() >> consider we can let vDPA parent to validate the length in its >> get_config(). >> > > I agree, most of the implementations already validate the length, the > only gain is an error returned since get_config() is void, but > eventually we can add a return value to it. Right, one problem here is that. For the virito path, its get_config() returns void. So we can not propagate error to virtio drivers. But it might not be a big issue since we trust kernel virtio driver. So I think it makes sense to change the return value in the vdpa config ops. Thanks > > Thanks, > Stefano > 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=-15.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham 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 178AAC433E0 for ; Thu, 28 Jan 2021 03:12:14 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A9BD964DA1 for ; Thu, 28 Jan 2021 03:12:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A9BD964DA1 Authentication-Results: mail.kernel.org; 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bh=DcrTmjoadIb7p2OxWm6C9AN0UzP4YCS8NJ0a7dpGJ98=; b=iRxUA8xwPuntLKakKQke54oZ/v1F5Tfi520WXEcQ/cz0sjskvXro3pCa0F0sfUkJhNFe5q tNONq6+XX+mRRviWs46xyFphDBODMxasUQ8qEUoTySRTtUTizWvPFV9hHyJKE7O29arTI1 bzTl4l+wsGPi+n2yt4CL5XIvi8cEIfQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-482-zc4-TNbrNLWVbKrUpxayDQ-1; Wed, 27 Jan 2021 22:12:04 -0500 X-MC-Unique: zc4-TNbrNLWVbKrUpxayDQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 362EE1005586; Thu, 28 Jan 2021 03:12:02 +0000 (UTC) Received: from [10.72.12.167] (ovpn-12-167.pek2.redhat.com [10.72.12.167]) by smtp.corp.redhat.com (Postfix) with ESMTP id 649365D9E3; Thu, 28 Jan 2021 03:11:51 +0000 (UTC) Subject: Re: [RFC v3 03/11] vdpa: Remove the restriction that only supports virtio-net devices To: Stefano Garzarella References: <20210119045920.447-1-xieyongji@bytedance.com> <20210119045920.447-4-xieyongji@bytedance.com> <310d7793-e4ff-fba3-f358-418cb64c7988@redhat.com> <20210120110832.oijcmywq7pf7psg3@steredhat> <1979cffc-240e-a9f9-b0ab-84a1f82ac81e@redhat.com> <20210127085728.j6x5yzrldp2wp55c@steredhat> From: Jason Wang Message-ID: <3cb239f5-fdd5-8311-35a0-c0f50b552521@redhat.com> Date: Thu, 28 Jan 2021 11:11:49 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210127085728.j6x5yzrldp2wp55c@steredhat> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: axboe@kernel.dk, corbet@lwn.net, kvm@vger.kernel.org, mst@redhat.com, linux-aio@kvack.org, netdev@vger.kernel.org, rdunlap@infradead.org, willy@infradead.org, virtualization@lists.linux-foundation.org, hch@infradead.org, Xie Yongji , bob.liu@oracle.com, bcrl@kvack.org, viro@zeniv.linux.org.uk, stefanha@redhat.com, linux-fsdevel@vger.kernel.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" Ck9uIDIwMjEvMS8yNyDkuIvljYg0OjU3LCBTdGVmYW5vIEdhcnphcmVsbGEgd3JvdGU6Cj4gT24g V2VkLCBKYW4gMjcsIDIwMjEgYXQgMTE6MzM6MDNBTSArMDgwMCwgSmFzb24gV2FuZyB3cm90ZToK Pj4KPj4gT24gMjAyMS8xLzIwIOS4i+WNiDc6MDgsIFN0ZWZhbm8gR2FyemFyZWxsYSB3cm90ZToK Pj4+IE9uIFdlZCwgSmFuIDIwLCAyMDIxIGF0IDExOjQ2OjM4QU0gKzA4MDAsIEphc29uIFdhbmcg d3JvdGU6Cj4+Pj4KPj4+PiBPbiAyMDIxLzEvMTkg5LiL5Y2IMTI6NTksIFhpZSBZb25namkgd3Jv dGU6Cj4+Pj4+IFdpdGggVkRVU0UsIHdlIHNob3VsZCBiZSBhYmxlIHRvIHN1cHBvcnQgYWxsIGtp bmRzIG9mIHZpcnRpbyBkZXZpY2VzLgo+Pj4+Pgo+Pj4+PiBTaWduZWQtb2ZmLWJ5OiBYaWUgWW9u Z2ppIDx4aWV5b25namlAYnl0ZWRhbmNlLmNvbT4KPj4+Pj4gLS0tCj4+Pj4+IMKgZHJpdmVycy92 aG9zdC92ZHBhLmMgfCAyOSArKystLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLQo+Pj4+PiDCoDEg ZmlsZSBjaGFuZ2VkLCAzIGluc2VydGlvbnMoKyksIDI2IGRlbGV0aW9ucygtKQo+Pj4+Pgo+Pj4+ PiBkaWZmIC0tZ2l0IGEvZHJpdmVycy92aG9zdC92ZHBhLmMgYi9kcml2ZXJzL3Zob3N0L3ZkcGEu Ywo+Pj4+PiBpbmRleCAyOWVkNDE3M2YwNGUuLjQ0OGJlNzg3NWI2ZCAxMDA2NDQKPj4+Pj4gLS0t IGEvZHJpdmVycy92aG9zdC92ZHBhLmMKPj4+Pj4gKysrIGIvZHJpdmVycy92aG9zdC92ZHBhLmMK Pj4+Pj4gQEAgLTIyLDYgKzIyLDcgQEAKPj4+Pj4gwqAjaW5jbHVkZSA8bGludXgvbm9zcGVjLmg+ Cj4+Pj4+IMKgI2luY2x1ZGUgPGxpbnV4L3Zob3N0Lmg+Cj4+Pj4+IMKgI2luY2x1ZGUgPGxpbnV4 L3ZpcnRpb19uZXQuaD4KPj4+Pj4gKyNpbmNsdWRlIDxsaW51eC92aXJ0aW9fYmxrLmg+Cj4+Pj4+ IMKgI2luY2x1ZGUgInZob3N0LmgiCj4+Pj4+IEBAIC0xODUsMjYgKzE4Niw2IEBAIHN0YXRpYyBs b25nIHZob3N0X3ZkcGFfc2V0X3N0YXR1cyhzdHJ1Y3QgCj4+Pj4+IHZob3N0X3ZkcGEgKnYsIHU4 IF9fdXNlciAqc3RhdHVzcCkKPj4+Pj4gwqDCoMKgwqAgcmV0dXJuIDA7Cj4+Pj4+IMKgfQo+Pj4+ PiAtc3RhdGljIGludCB2aG9zdF92ZHBhX2NvbmZpZ192YWxpZGF0ZShzdHJ1Y3Qgdmhvc3RfdmRw YSAqdiwKPj4+Pj4gLcKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBz dHJ1Y3Qgdmhvc3RfdmRwYV9jb25maWcgKmMpCj4+Pj4+IC17Cj4+Pj4+IC3CoMKgwqAgbG9uZyBz aXplID0gMDsKPj4+Pj4gLQo+Pj4+PiAtwqDCoMKgIHN3aXRjaCAodi0+dmlydGlvX2lkKSB7Cj4+ Pj4+IC3CoMKgwqAgY2FzZSBWSVJUSU9fSURfTkVUOgo+Pj4+PiAtwqDCoMKgwqDCoMKgwqAgc2l6 ZSA9IHNpemVvZihzdHJ1Y3QgdmlydGlvX25ldF9jb25maWcpOwo+Pj4+PiAtwqDCoMKgwqDCoMKg wqAgYnJlYWs7Cj4+Pj4+IC3CoMKgwqAgfQo+Pj4+PiAtCj4+Pj4+IC3CoMKgwqAgaWYgKGMtPmxl biA9PSAwKQo+Pj4+PiAtwqDCoMKgwqDCoMKgwqAgcmV0dXJuIC1FSU5WQUw7Cj4+Pj4+IC0KPj4+ Pj4gLcKgwqDCoCBpZiAoYy0+bGVuID4gc2l6ZSAtIGMtPm9mZikKPj4+Pj4gLcKgwqDCoMKgwqDC oMKgIHJldHVybiAtRTJCSUc7Cj4+Pj4+IC0KPj4+Pj4gLcKgwqDCoCByZXR1cm4gMDsKPj4+Pj4g LX0KPj4+Pgo+Pj4+Cj4+Pj4gSSB0aGluayB3ZSBzaG91bGQgdXNlIGEgc2VwYXJhdGUgcGF0Y2gg Zm9yIHRoaXMuCj4+Pgo+Pj4gRm9yIHRoZSB2ZHBhLWJsayBzaW11bGF0b3IgSSBoYWQgdGhlIHNh bWUgaXNzdWVzIGFuZCBJJ20gYWRkaW5nIGEgCj4+PiAuZ2V0X2NvbmZpZ19zaXplKCkgY2FsbGJh Y2sgdG8gdmRwYSBkZXZpY2VzLgo+Pj4KPj4+IERvIHlvdSB0aGluayBtYWtlIHNlbnNlIG9yIGlz IGJldHRlciB0byByZW1vdmUgdGhpcyBjaGVjayBpbiAKPj4+IHZob3N0L3ZkcGEsIGRlbGVnYXRp bmcgdGhlIGJvdW5kYXJpZXMgY2hlY2tzIHRvIAo+Pj4gZ2V0X2NvbmZpZy9zZXRfY29uZmlnIGNh bGxiYWNrcy4KPj4KPj4KPj4gQSBxdWVzdGlvbiBoZXJlLiBIb3cgbXVjaCB2YWx1ZSBjb3VsZCB3 ZSBnYWluIGZyb20gZ2V0X2NvbmZpZ19zaXplKCkgCj4+IGNvbnNpZGVyIHdlIGNhbiBsZXQgdkRQ QSBwYXJlbnQgdG8gdmFsaWRhdGUgdGhlIGxlbmd0aCBpbiBpdHMgCj4+IGdldF9jb25maWcoKS4K Pj4KPgo+IEkgYWdyZWUsIG1vc3Qgb2YgdGhlIGltcGxlbWVudGF0aW9ucyBhbHJlYWR5IHZhbGlk YXRlIHRoZSBsZW5ndGgsIHRoZSAKPiBvbmx5IGdhaW4gaXMgYW4gZXJyb3IgcmV0dXJuZWQgc2lu Y2UgZ2V0X2NvbmZpZygpIGlzIHZvaWQsIGJ1dCAKPiBldmVudHVhbGx5IHdlIGNhbiBhZGQgYSBy ZXR1cm4gdmFsdWUgdG8gaXQuCgoKUmlnaHQsIG9uZSBwcm9ibGVtIGhlcmUgaXMgdGhhdC4gRm9y IHRoZSB2aXJpdG8gcGF0aCwgaXRzIGdldF9jb25maWcoKSAKcmV0dXJucyB2b2lkLiBTbyB3ZSBj YW4gbm90IHByb3BhZ2F0ZSBlcnJvciB0byB2aXJ0aW8gZHJpdmVycy4gQnV0IGl0IAptaWdodCBu b3QgYmUgYSBiaWcgaXNzdWUgc2luY2Ugd2UgdHJ1c3Qga2VybmVsIHZpcnRpbyBkcml2ZXIuCgpT byBJIHRoaW5rIGl0IG1ha2VzIHNlbnNlIHRvIGNoYW5nZSB0aGUgcmV0dXJuIHZhbHVlIGluIHRo ZSB2ZHBhIGNvbmZpZyBvcHMuCgpUaGFua3MKCgo+Cj4gVGhhbmtzLAo+IFN0ZWZhbm8KPgoKX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KVmlydHVhbGl6YXRp b24gbWFpbGluZyBsaXN0ClZpcnR1YWxpemF0aW9uQGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3Jn Cmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3ZpcnR1 YWxpemF0aW9u