* [virtio-comment] Question regarding packed ring Virtio 1.1 feature [not found] <2082409902.10853513.1574343487818.JavaMail.zimbra@redhat.com> @ 2019-11-21 13:40 ` Yuri Benditovich 2019-11-24 12:17 ` Michael S. Tsirkin 0 siblings, 1 reply; 2+ messages in thread From: Yuri Benditovich @ 2019-11-21 13:40 UTC (permalink / raw) To: virtio-comment [-- Attachment #1: Type: text/plain, Size: 292 bytes --] Hi, From the spec it looks like the device must maintain backward compatibility 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 hardware device? Thanks, Yuri Benditovich [-- Attachment #2: Type: text/html, Size: 527 bytes --] ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [virtio-comment] Question regarding packed ring Virtio 1.1 feature 2019-11-21 13:40 ` [virtio-comment] Question regarding packed ring Virtio 1.1 feature Yuri Benditovich @ 2019-11-24 12:17 ` Michael S. Tsirkin 0 siblings, 0 replies; 2+ messages in thread From: Michael S. Tsirkin @ 2019-11-24 12:17 UTC (permalink / raw) To: Yuri Benditovich; +Cc: virtio-comment On Thu, Nov 21, 2019 at 08:40:29AM -0500, Yuri Benditovich wrote: > Hi, > > From the spec it looks like the device must maintain backward compatibility > 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 hardware > device? > > 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. -- MST 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/ ^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-11-21 13:40 ` [virtio-comment] Question regarding packed ring Virtio 1.1 feature Yuri Benditovich
2019-11-24 12:17 ` Michael S. Tsirkin
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