From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-comment-return-932-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id 06B87985A54 for ; Sun, 24 Nov 2019 12:17:55 +0000 (UTC) Date: Sun, 24 Nov 2019 07:17:02 -0500 From: "Michael S. Tsirkin" Message-ID: <20191124071528-mutt-send-email-mst@kernel.org> References: <2082409902.10853513.1574343487818.JavaMail.zimbra@redhat.com> <1094048041.10853770.1574343629558.JavaMail.zimbra@redhat.com> MIME-Version: 1.0 In-Reply-To: <1094048041.10853770.1574343629558.JavaMail.zimbra@redhat.com> Subject: Re: [virtio-comment] Question regarding packed ring Virtio 1.1 feature Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline To: Yuri Benditovich Cc: virtio-comment@lists.oasis-open.org List-ID: On Thu, Nov 21, 2019 at 08:40:29AM -0500, Yuri Benditovich wrote: > Hi, >=20 > From the spec it looks like the device must maintain backward compatibili= ty > with Virt 1.0 split queue implementation and use the packed one only when > negotiated. > What is the rational of such limitation, especially in case of true hardw= are > device? >=20 > Thanks, > Yuri Benditovich I don't think that's intentional. Any device without a split queue implementation will fail negotiation if PACKED_RING has not been negotiated. It's more of a SHOULD since split ring support allows backwards compatibility with deployed software. --=20 MST This publicly archived list offers a means to provide input to the=0D OASIS Virtual I/O Device (VIRTIO) TC.=0D =0D In order to verify user consent to the Feedback License terms and=0D to minimize spam in the list archive, subscription is required=0D before posting.=0D =0D Subscribe: virtio-comment-subscribe@lists.oasis-open.org=0D Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org=0D List help: virtio-comment-help@lists.oasis-open.org=0D List archive: https://lists.oasis-open.org/archives/virtio-comment/=0D Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf= =0D List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lis= ts=0D Committee: https://www.oasis-open.org/committees/virtio/=0D Join OASIS: https://www.oasis-open.org/join/