Re: [PATCH] Revert "virtio_pci: Support surprise removal of virtio pci device"

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

On Tue, Aug 26, 2025 at 06:52:11PM +0000, Parav Pandit wrote:
> > > > If it does not, and a user pull out the working device, how does
> > > > your patch help?
> > > >
> > > A driver must tell that it will not follow broken ancient behaviour and at that
> > point device would stop its ancient backward compatibility mode.
> > 
> > 
> > 
> > I don't know what is "ancient backward compatibility mode".
> > 
> Let me explain.
> Sadly, CSPs virtio pci device implementation is done such a way that, it works with ancient Linux kernel which does not have commit 43bb40c5b9265.


OK we are getting new information here.

So let me summarize. There's a virtual system that pretends, to the
guest, that device was removed by surprise removal, but actually
device is there and is still doing DMA.
Is that a fair summary?

-- 
MST