From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Roman Kiryanov <rkir@google.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
virtio-dev@lists.oasis-open.org, Lingfeng Yang <lfy@google.com>
Subject: Re: [virtio-dev] Memory sharing device
Date: Tue, 12 Feb 2019 11:25:47 +0000 [thread overview]
Message-ID: <20190212112547.GC2715@work-vm> (raw)
In-Reply-To: <CAOGAQepzNSZ5c+tB+e-sYRzQMag2Pr+H0ToJhtd-4mLubY9xeA@mail.gmail.com>
* Roman Kiryanov (rkir@google.com) wrote:
> > > Our long term goal is to have as few kernel drivers as possible and to move
> > > "drivers" into userspace. If we go with the virtqueues, is there
> > > general a purpose
> > > device/driver to talk between our host and guest to support custom hardware
> > > (with own blobs)?
> >
> > The challenge is to answer the following question:
> > how to do this without losing the benefits of standartization?
>
> We looked into UIO and it still requires some kernel driver to tell
> where the device is, it also has limitations on sharing a device
> between processes. The benefit of standardization could be in avoiding
> everybody writing their own UIO drivers for virtual devices.
>
> Our emulator uses a battery, sound, accelerometer and more. We need to
> support all of this. I looked into the spec, "5 Device types", and
> seems "battery" is not there. We can invent our own drivers but we see
> having one flexible driver is a better idea.
Can you group these devices together at all in their requirements?
For example, battery and accelerometers (to me) sound like low-bandwidth
'sensors' with a set of key,value pairs that update occasionally
and a limited (no?) amount of control from the VM->host.
A 'virtio-values' device that carried a string list of keys that it
supported might make sense and be enough for at least two of your
device types.
Dave
> Yes, I realize that a guest could think it is using the same device as
> the host advertised (because strings matched) while it is not. We
> control both the host and the guest and we can live with this.
>
> Regards,
> Roman.
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
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next prev parent reply other threads:[~2019-02-12 11:26 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 20:34 [virtio-dev] Memory sharing device Roman Kiryanov
2019-02-04 5:40 ` Stefan Hajnoczi
2019-02-04 10:13 ` Gerd Hoffmann
2019-02-04 10:18 ` Roman Kiryanov
2019-02-05 7:42 ` Roman Kiryanov
2019-02-05 10:04 ` Dr. David Alan Gilbert
2019-02-05 15:17 ` Frank Yang
2019-02-05 15:21 ` Frank Yang
2019-02-05 21:06 ` Roman Kiryanov
2019-02-06 7:03 ` Gerd Hoffmann
2019-02-06 15:09 ` Frank Yang
2019-02-06 15:11 ` Frank Yang
2019-02-08 7:57 ` Stefan Hajnoczi
2019-02-08 14:46 ` Frank Yang
2019-02-06 20:14 ` Dr. David Alan Gilbert
2019-02-06 20:27 ` Frank Yang
2019-02-07 12:10 ` Cornelia Huck
2019-02-11 14:49 ` Michael S. Tsirkin
2019-02-11 15:14 ` Frank Yang
2019-02-11 15:25 ` Frank Yang
2019-02-12 13:01 ` Michael S. Tsirkin
2019-02-12 13:16 ` Dr. David Alan Gilbert
2019-02-12 13:27 ` Michael S. Tsirkin
2019-02-12 16:17 ` Frank Yang
2019-02-19 7:17 ` Gerd Hoffmann
2019-02-19 15:59 ` Frank Yang
2019-02-20 6:51 ` Gerd Hoffmann
2019-02-20 15:31 ` Frank Yang
2019-02-21 6:55 ` Gerd Hoffmann
2019-02-19 7:12 ` Gerd Hoffmann
2019-02-19 16:02 ` Frank Yang
2019-02-20 7:02 ` Gerd Hoffmann
2019-02-20 15:32 ` Frank Yang
2019-02-21 7:29 ` Gerd Hoffmann
2019-02-21 9:24 ` Dr. David Alan Gilbert
2019-02-21 9:59 ` Gerd Hoffmann
2019-02-21 10:03 ` Dr. David Alan Gilbert
2019-02-22 6:15 ` Michael S. Tsirkin
2019-02-22 6:42 ` Gerd Hoffmann
2019-02-11 16:57 ` Michael S. Tsirkin
2019-02-12 8:27 ` Roman Kiryanov
2019-02-12 11:25 ` Dr. David Alan Gilbert [this message]
2019-02-12 13:47 ` Cornelia Huck
2019-02-12 14:03 ` Michael S. Tsirkin
2019-02-12 15:56 ` Frank Yang
2019-02-12 16:46 ` Dr. David Alan Gilbert
2019-02-12 17:20 ` Frank Yang
2019-02-12 17:26 ` Frank Yang
2019-02-12 19:06 ` Michael S. Tsirkin
2019-02-13 2:50 ` Frank Yang
2019-02-13 4:02 ` Michael S. Tsirkin
2019-02-13 4:19 ` Michael S. Tsirkin
2019-02-13 4:59 ` Frank Yang
2019-02-13 18:18 ` Frank Yang
2019-02-14 7:15 ` Frank Yang
2019-02-22 22:05 ` Michael S. Tsirkin
2019-02-24 21:19 ` Frank Yang
2019-02-13 4:59 ` Frank Yang
2019-02-19 7:54 ` Gerd Hoffmann
2019-02-19 15:54 ` Frank Yang
2019-02-20 3:46 ` Michael S. Tsirkin
2019-02-20 15:24 ` Frank Yang
2019-02-20 19:29 ` Michael S. Tsirkin
2019-02-20 6:25 ` Gerd Hoffmann
2019-02-20 15:30 ` Frank Yang
2019-02-20 15:35 ` Frank Yang
2019-02-21 6:44 ` Gerd Hoffmann
2019-02-12 18:22 ` Michael S. Tsirkin
2019-02-12 19:01 ` Frank Yang
2019-02-12 19:15 ` Michael S. Tsirkin
2019-02-12 20:15 ` Frank Yang
2019-02-12 13:00 ` Michael S. Tsirkin
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