[virtio-dev] Re: [PATCH v2 0/2] transport-pci: Introduce legacy registers access using AQ

Michael S. Tsirkin
2023-05-15T17:45:00Z

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?

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MST