From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 E00B19863C3 for ; Tue, 3 Aug 2021 06:28:55 +0000 (UTC) From: Cornelia Huck In-Reply-To: <20210802130043-mutt-send-email-mst@kernel.org> References: <20210726165254.8529-1-mgurtovoy@nvidia.com> <20210728083306-mutt-send-email-mst@kernel.org> <20210730032625-mutt-send-email-mst@kernel.org> <0bffb13f-4e88-266d-e072-bafa44ec86fe@nvidia.com> <20210731175617-mutt-send-email-mst@kernel.org> <8360728a-68e7-3727-be2c-20b3a259a633@nvidia.com> <874kc727pi.fsf@redhat.com> <738e1458-2a54-f534-df62-3be198487e91@nvidia.com> <20210802130043-mutt-send-email-mst@kernel.org> Date: Tue, 03 Aug 2021 08:28:42 +0200 Message-ID: <87y29jyrc5.fsf@redhat.com> MIME-Version: 1.0 Subject: [virtio-comment] Re: [RFC PATCH v2 1/2] Add virtio Admin Virtqueue specification Content-Type: text/plain To: "Michael S. Tsirkin" , Max Gurtovoy Cc: virtio-comment@lists.oasis-open.org, jasowang@redhat.com, stefanha@redhat.com, oren@nvidia.com, parav@nvidia.com, shahafs@nvidia.com, eperezma@redhat.com, aadam@redhat.com, bodong@nvidia.com, amikheev@nvidia.com List-ID: On Mon, Aug 02 2021, "Michael S. Tsirkin" wrote: > On Mon, Aug 02, 2021 at 07:03:11PM +0300, Max Gurtovoy wrote: >> There is no much bits left in the generic feature field for all the features >> we would like to add. >> I mentioned only 5-6 in the above example and it will bring us to bit 46 >> already. >> >> please think of 5-10 years from today. >> > > IIUC nothing prevents adding more once we exhaust 64 bits. IMHO it's actually > pretty important to make sure the feature negotiation works well > and covers relevant usecases. If we have limitations preventing that > I'd like to at least try to fix that not replacing feature negotiation with > something else. I recall that we had a discussion about that years ago when we introduced VERSION_1; we explicitly agreed that we can extend features beyond 64 bit once we need it. (A quick search did not turn up that mail exchange, though.) This publicly archived list offers a means to provide input to the OASIS Virtual I/O Device (VIRTIO) TC. In order to verify user consent to the Feedback License terms and to minimize spam in the list archive, subscription is required before posting. Subscribe: virtio-comment-subscribe@lists.oasis-open.org Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org List help: virtio-comment-help@lists.oasis-open.org List archive: https://lists.oasis-open.org/archives/virtio-comment/ Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists Committee: https://www.oasis-open.org/committees/virtio/ Join OASIS: https://www.oasis-open.org/join/