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Subject: Re: [virtio-comment] [PATCH V3 RESEND 1/4] Introduce virito transport virtqueue
On Tue, Aug 9, 2022 at 5:35 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > On Tue, Aug 09, 2022 at 05:31:32PM +0800, Jason Wang wrote: > > On Tue, Aug 9, 2022 at 5:28 PM Zhu, Lingshan <lingshan.zhu@intel.com> wrote: > > > > > > > > > > > > On 8/9/2022 5:21 PM, Jason Wang wrote: > > > > On Tue, Aug 9, 2022 at 5:19 PM Zhu, Lingshan <lingshan.zhu@intel.com> wrote: > > > >> > > > >> > > > >> On 8/9/2022 5:12 PM, Michael S. Tsirkin wrote: > > > >>> On Tue, Aug 09, 2022 at 04:36:43PM +0800, Zhu, Lingshan wrote: > > > >>>>>> + > > > >>>>>> +A device that offers feature bit VIRTIO_F_TRANSPT_VQ and a transport virtqueue is a management device. > > > >>>>>> +It processes the commands through the transport virtqueue commands. > > > >>>>> I think we need to be verbose here, e.g what did those transport > > > >>>>> virtqueue commands do? What's the relationship between management > > > >>>>> device and managed device? > > > >>>> I will add an overview of the transport virtqueue commands here, and a > > > >>>> description of the relationship in the "managed device" section. > > > >>> Transport is fine but management of devices is clearly something > > > >>> nvidia's patches do. So I think it's best to reuse the concept of device > > > >>> groups for this, from Max's patchset. Let's not replicate that work at > > > >>> least. I promised Max to help a bit with wording so I'll soon send a > > > >>> revision of his patchset, the generic part about device group > > > >>> from which you should be able to reuse. > > > >> Of course, it is possible to add the device groups in this series for sure. > > > >> > > > >> What I don't understand is: what kind of commands against a device > > > >> group? Destroy all? > > > >> And normally a parent device only support one kind of devices, like a > > > >> SRIOV capable > > > >> virtio-net PF only supports virtio-net VFs on it, and maybe there will > > > >> not be > > > >> a device support both SIOV and SRIOV, it is complex in the HW > > > >> implementation. > > > > For having backward compatibility? (E.g for platforms that don't support SIOV) > > > > > > > > Thanks > > > If not a device model like SIOV which does not have a dedicated physical > > > transport layer, > > > the question would be: Why do we need a side channel for a VF? This > > > looks conflicts with > > > VF provisioning and virtio-spec definitions. E.g, why allow changing MSI > > > in the flight > > > outside the guest control? > > > > Just to clarify my points. I meant that vendors may choose to > > implement both SRIOV and SIOV in the hardware. And I believe this is > > what most vendor will do. > > > > But it doesn't mean the control path needs to be shared. > > > > Thanks > > Okay. But I feel some general structure and terminology should be shared, given > the similarity. Yes, I agree. Thanks > > > > > > > > Thanks, > > > Zhu Lingshan > > > > > > > >> Thanks, > > > >> Zhu Lingshan > > > >> > > > >
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