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Subject: Re: [PATCH v2 0/2] transport-pci: Introduce legacy registers access using AQ
On Mon, May 15, 2023 at 05:51:05PM +0000, Parav Pandit wrote: > > > From: Michael S. Tsirkin <mst@redhat.com> > > Sent: Monday, May 15, 2023 1:45 PM > > > > On Mon, May 15, 2023 at 03:49:44PM +0000, Parav Pandit wrote: > > > All legacy interface via AQ. > > > All modern interface access via PCI or its own transport between driver and > > device. > > > > I am wondering however about the hypervisor notifications. Generally these > > are the most problematic aspect here I feel. For example, how does it interact > > with VIRTIO_F_NOTIF_CONFIG_DATA? And generally, having both guest and > > host be allowed to access device's BAR seems problematic. > > Can we reserve a PF BAR region for these things or is that too expensive? > > VIRTIO_F_NOTIF_CONFIG_DATA is not present for the legacy. it is not but it just might be required, or it won't be there. > For modern device, guest driver will access the device own BAR directly with its own config_data anyway. > Should we reserve a region in the PF BAR for SF/SIOV device?, should device report which BAR/area to use for the given SF/SIOV device? > May be yes, those are different discussions with tradeoff to consider during SIOV discussions. It is not related to VFs. For SIOV it's a given. But we can do this for SRIOV: reserve a PF region per VF.
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