Re: [PATCH 2/3] hw/9pfs/virtio: disable hotpluggable property of virtio-9p device

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

On Friday, 10 July 2026 09:37:37 CEST Igor Mammedov wrote:
> On Thu, 9 Jul 2026 15:50:36 +0200
> 
> Christian Schoenebeck <qemu_oss@crudebyte.com> wrote:
> > Harden security by disabling hotpluggable property, to prevent
> > issues like fixed in the previous commit.
> > 
> > Virtio-9p is a pass-through file-sharing device that provides a
> > guest mount of a host filesystem tree. Unlike block or network
> > devices, guest-triggered hotplug of the 9p device has no practical
> > use case: the guest cannot recover from the device removal, and there
> > is no protocol-level device-loss scenario as with block or ethernet
> > devices.
> 
> hmh, I'm no maintainer of 9pfs, but to me it looks like any other
> storage device.
> One should be able to unmount/stop using it and unplug
> (it doesn't really matter if unplug is triggered by guest or host side).

Guest could still unmount and stop using the 9pfs device. But why should guest 
be able to unrealize the 9pfs device at any time? What should be the purpose 
for this particular device?

/Christian