Re: [PATCH] pc-bios/s390-ccw: Use memory barriers in virtio code

[Peter Maydell]

On Tue, 16 Feb 2021 at 14:30, Cornelia Huck <cohuck@redhat.com> wrote:
> Step 4 in "2.7.13 Supplying Buffers to The Device":
>
> "The driver performs a suitable memory barrier to ensure the device
> sees the updated descriptor table and available ring before the next
> step."

I thought that my first time through the spec as well, but
I think the whole of section 2.7 is dealing with "packed virtqueues",
which have to be explicitly negotiated and which I don't think
the s390-ccw code is doing.

thnaks
-- PMM