[RFC PATCH 1/2] hw/nvme: add mi device

[Christoph Hellwig]

On Mon, Jul 12, 2021 at 12:03:27PM +0100, Stefan Hajnoczi wrote:
> Why did you decide to implement -device nvme-mi as a device on
> TYPE_NVME_BUS? If the NVMe spec somehow requires this then I'm surprised
> that there's no NVMe bus interface (callbacks). It seems like this could
> just as easily be a property of an NVMe controller -device
> nvme,mi=on|off or -device nvme-subsys,mi=on|off? I'm probably just not
> familiar enough with MI and NVMe architecture...

I'm too far away from qemu these days to understand what TYPE_NVME_BUS
is.  Bt NVMe-MI has tree possible transports:

 1) out of band through smbus.  This seems something that could be
    trivially modelled in qemu
 2) out of band over MCTP / PCIe VDM.
 3) in band using NVMe admin commands that pass through MI commands