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Subject: Re: [PATCH v3 0/3] transport-pci: Introduce legacy registers access using AQ
On Sun, Jun 04, 2023 at 01:41:54PM +0000, Parav Pandit wrote: > > > > From: Michael S. Tsirkin <mst@redhat.com> > > Sent: Sunday, June 4, 2023 9:34 AM > > > > On Fri, Jun 02, 2023 at 11:36:01PM +0300, Parav Pandit wrote: > > > This short series introduces legacy registers access commands for the > > > owner group member PCI PF to access the legacy registers of the member VFs. > > > > Note that some work will be needed here to fix up grammar and spelling > > mistakes. > > > I already verified using codespell but I guess it missed few. > If you have specific already identified, let me know. I remember seeing something about a drier somewhere :) > If not I will run a different checker. Yea, pls check grammar too. > > > If in future any SIOV devices to support legacy registers, they can be > > > easily supported using same commands by using the group member > > > identifiers of the future SIOV devices. > > > > Yes, with the exception of > > VIRTIO_ADMIN_CMD_LQ_NOTIFY_QUERY - currently refers to VF BAR, > > subfunctions do not have it. > A subfunction will also have its own BAR carved out from the PF BAR. > A subfunction definition will be as contains as possible. > > > Can we find a way to have it in the PF BAR instead? > At subfution level also it will be a BAR number, which will map to the PF BAR. exactly. why not support this for PF too? > > E.g. the notification can include VF# + VQ#? > > At least as an option? > No. we discussed this before to have each device on its own BAR. Hence no VF# in the doorbell. you said that you want it but without much in the way of explanation. I'm still not convinced it's a workable interface. Will it help if I get some feedback from windows driver team on the design? > > If not can you add some info explaining why not? > Yes, Good point. > I will add the commit log explanation that every VF has its own BAR hence it does not use PF BAR. -- MST
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