Re: [PATCH V7 v7] virtio: introduce SUSPEND bit in device status

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Aug 13, 2024 at 04:42:06AM +0000, Parav Pandit wrote:
> a. suspending a device is non frequent operation (in order of N operations/sec, where N is roughly in range of 10 or 100) per device?
> b. A software-based device may not always want to force VM_EXIT on read and write on the device_status register?

I just see where this is going.  Parav, if you want a device with
as little as possible memory on it, using DMA as much as possible,
what you want is develop an alternative transport
that will let you control status without using memory accesses.
This will also, with time, allow doing this for existing config space.
We aren't blocking all spec development until you do, and the tradeoff
of easy to debug, robust MMIO control versus complex but maybe
cheaper for some hardware vendors DMA based access is up to the
device.

-- 
MST