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Date:   Mon, 17 Jul 2023 16:52:03 -0600
From:   Alex Williamson <alex.williamson@redhat.com>
To:     Jason Gunthorpe <jgg@ziepe.ca>
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Subject: Re: [PATCH 0/2] eventfd: simplify signal helpers
Message-ID: <20230717165203.4ee6b1e6.alex.williamson@redhat.com>
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        <CAH76GKPF4BjJLrzLBW8k12ATaAGADeMYc2NQ9+j0KgRa0pomUw@mail.gmail.com>
        <20230717130831.0f18381a.alex.williamson@redhat.com>
        <ZLW8wEzkhBxd0O0L@ziepe.ca>
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On Mon, 17 Jul 2023 19:12:16 -0300
Jason Gunthorpe <jgg@ziepe.ca> wrote:

> On Mon, Jul 17, 2023 at 01:08:31PM -0600, Alex Williamson wrote:
> 
> > What would that mechanism be?  We've been iterating on getting the
> > serialization and buffering correct, but I don't know of another means
> > that combines the notification with a value, so we'd likely end up with
> > an eventfd only for notification and a separate ring buffer for
> > notification values.  
> 
> All FDs do this. You just have to make a FD with custom
> file_operations that does what this wants. The uAPI shouldn't be able
> to tell if the FD is backing it with an eventfd or otherwise. Have the
> kernel return the FD instead of accepting it. Follow the basic design
> of eg mlx5vf_save_fops

Sure, userspace could poll on any fd and read a value from it, but at
that point we're essentially duplicating a lot of what eventfd provides
for a minor(?) semantic difference over how the counter value is
interpreted.  Using an actual eventfd allows the ACPI notification to
work as just another interrupt index within the existing vfio IRQ uAPI.
Thanks,

Alex