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SubjectRe: [PATCH 2/2] vfio/mdev: don't warn if ->request is not set
On Mon, 26 Jul 2021 20:09:06 -0300
Jason Gunthorpe <> wrote:

> On Mon, Jul 26, 2021 at 07:07:04PM +0200, Cornelia Huck wrote:
> > But I wonder why nobody else implements this? Lack of surprise removal?
> The only implementation triggers an eventfd that seems to be the same
> eventfd as the interrupt..
> Do you know how this works in userspace? I'm surprised that the
> interrupt eventfd can trigger an observation that the kernel driver
> wants to be unplugged?

I think we're talking about ccw, but I see QEMU registering separate
eventfds for each of the 3 IRQ indexes and the mdev driver specifically
triggering the req_trigger...? Thanks,


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