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=-6.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 BE83EC433E0 for ; Sun, 28 Feb 2021 21:36:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8681E64E54 for ; Sun, 28 Feb 2021 21:36:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231286AbhB1Vgc (ORCPT ); Sun, 28 Feb 2021 16:36:32 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:60837 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230414AbhB1VgZ (ORCPT ); Sun, 28 Feb 2021 16:36:25 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614548099; 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: in-reply-to:in-reply-to:references:references; bh=ReI9nC5t0ilGJKO9iEAq6ntFlruOaE8Rz2Sr5GLVUJo=; b=Hm330mEl0HmLWRDSjiGWPTI+Ji90yV+g5IW3uZCqQqflFQy59EzDK1OadFZ32R2lQus2zQ mxeDp8lIhI9l9hQLSPXOIFeOXBY9STuLWZzl1iqEmMHdw/Ez61quNhLUixZ0I63MY/FQQW 3ZTDPrjSV/JvZrJN06mOOGXJOSFH1s0= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-49-B0xp6CNBNSqPRQIU_c-Wbw-1; Sun, 28 Feb 2021 16:34:58 -0500 X-MC-Unique: B0xp6CNBNSqPRQIU_c-Wbw-1 Received: by mail-ej1-f72.google.com with SMTP id au15so168428ejc.8 for ; Sun, 28 Feb 2021 13:34:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=ReI9nC5t0ilGJKO9iEAq6ntFlruOaE8Rz2Sr5GLVUJo=; b=GkiqPKcRwHDr+PGJJtURKcRXaG+336hgdlcn2JB3siFTBkMhQBlpI0/PlKQGZSBqh3 UgZn58VuvQEsly3LLjWVX/v98FvBndXmvpxDYNVD+lA69YT5tXqkPYewF+c8n8vHbz5G pI1m4+M0rWYHt64pk4XWWrCrhtrxv2uBSAz+nVWg/grMoE+Ve+y3rZ0hfVhrcAxUblNh WULgFvP7G5A9E3Txb+JUgwalkU0gls4pVIgCa2Hao67xVOenhWZfBSSsZc8280uDuzqw gIwszepA2+f9hAKSsIFKNG5esgtybVkKRfn8urWEqiK1+zf7zHOnVbs75/b1mVLwoZxb kT0w== X-Gm-Message-State: AOAM533NtPxonyeBptHbt7ZGMLp0Lm5O0hd9bNan2mRiOm4Et1YMXewV hC8ViwzBgf8TxML6vgz76iHtO6Jd8rmNTj1KdR+w0kNoRQcnOAU9+kA8WpoT5/3EkJOfmCl1lFm Zy164iZOEtOJbBn1C6o3LmyNG X-Received: by 2002:aa7:d954:: with SMTP id l20mr9537928eds.1.1614548096612; Sun, 28 Feb 2021 13:34:56 -0800 (PST) X-Google-Smtp-Source: ABdhPJyZfpQusPlK8SeLupsX5MkpMrCMoVqG9E1G+3AItVqjBlS3hF76KS3hDto3VFFR3Yt+hLv8gQ== X-Received: by 2002:aa7:d954:: with SMTP id l20mr9537925eds.1.1614548096518; Sun, 28 Feb 2021 13:34:56 -0800 (PST) Received: from redhat.com (bzq-79-180-2-31.red.bezeqint.net. [79.180.2.31]) by smtp.gmail.com with ESMTPSA id lm24sm4333097ejb.53.2021.02.28.13.34.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 Feb 2021 13:34:56 -0800 (PST) Date: Sun, 28 Feb 2021 16:34:53 -0500 From: "Michael S. Tsirkin" To: Si-Wei Liu Cc: Jason Wang , elic@nvidia.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: Re: [PATCH] vdpa/mlx5: set_features should allow reset to zero Message-ID: <20210228163031-mutt-send-email-mst@kernel.org> References: <1613735698-3328-1-git-send-email-si-wei.liu@oracle.com> <605e7d2d-4f27-9688-17a8-d57191752ee7@redhat.com> <20210222023040-mutt-send-email-mst@kernel.org> <22fe5923-635b-59f0-7643-2fd5876937c2@oracle.com> <20210223082536-mutt-send-email-mst@kernel.org> <3ff5fd23-1db0-2f95-4cf9-711ef403fb62@oracle.com> <20210224000057-mutt-send-email-mst@kernel.org> <52836a63-4e00-ff58-50fb-9f450ce968d7@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <52836a63-4e00-ff58-50fb-9f450ce968d7@oracle.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 24, 2021 at 10:24:41AM -0800, Si-Wei Liu wrote: > > Detecting it isn't enough though, we will need a new ioctl to notify > > the kernel that it's a legacy guest. Ugh :( > Well, although I think adding an ioctl is doable, may I know what the use > case there will be for kernel to leverage such info directly? Is there a > case QEMU can't do with dedicate ioctls later if there's indeed > differentiation (legacy v.s. modern) needed? BTW a good API could be #define VHOST_SET_ENDIAN _IOW(VHOST_VIRTIO, ?, int) #define VHOST_GET_ENDIAN _IOW(VHOST_VIRTIO, ?, int) we did it per vring but maybe that was a mistake ... -- MST