From: Cornelia Huck <cohuck@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>,
Viktor Prutyanov <viktor@daynix.com>
Cc: Jason Wang <jasowang@redhat.com>,
pasic@linux.ibm.com, farman@linux.ibm.com,
linux-s390@vger.kernel.org, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, yan@daynix.com
Subject: Re: [PATCH v2] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
Date: Tue, 21 Mar 2023 14:10:23 +0100 [thread overview]
Message-ID: <87jzzamerk.fsf@redhat.com> (raw)
In-Reply-To: <20230321050719-mutt-send-email-mst@kernel.org>
On Tue, Mar 21 2023, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Tue, Mar 21, 2023 at 12:00:42PM +0300, Viktor Prutyanov wrote:
>> On Tue, Mar 21, 2023 at 5:29 AM Jason Wang <jasowang@redhat.com> wrote:
>> >
>> > On Tue, Mar 21, 2023 at 7:21 AM Viktor Prutyanov <viktor@daynix.com> wrote:
>> > >
>> > > According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature
>> > > indicates that the driver passes extra data along with the queue
>> > > notifications.
>> > >
>> > > In a split queue case, the extra data is 16-bit available index. In a
>> > > packed queue case, the extra data is 1-bit wrap counter and 15-bit
>> > > available index.
>> > >
>> > > Add support for this feature for MMIO and PCI transports. Channel I/O
>> > > transport will not accept this feature.
>> > >
>> > > Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
>> > > ---
>> > >
>> > > v2: reject the feature in virtio_ccw, replace __le32 with u32
>> > >
>> > > drivers/s390/virtio/virtio_ccw.c | 4 +---
>> > > drivers/virtio/virtio_mmio.c | 15 ++++++++++++++-
>> > > drivers/virtio/virtio_pci_common.c | 10 ++++++++++
>> > > drivers/virtio/virtio_pci_common.h | 4 ++++
>> > > drivers/virtio/virtio_pci_legacy.c | 2 +-
>> > > drivers/virtio/virtio_pci_modern.c | 2 +-
>> > > drivers/virtio/virtio_ring.c | 17 +++++++++++++++++
>> > > include/linux/virtio_ring.h | 2 ++
>> > > include/uapi/linux/virtio_config.h | 6 ++++++
>> > > 9 files changed, 56 insertions(+), 6 deletions(-)
>> > >
>> > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
>> > > index a10dbe632ef9..d72a59415527 100644
>> > > --- a/drivers/s390/virtio/virtio_ccw.c
>> > > +++ b/drivers/s390/virtio/virtio_ccw.c
>> > > @@ -789,9 +789,7 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev)
>> > >
>> > > static void ccw_transport_features(struct virtio_device *vdev)
>> > > {
>> > > - /*
>> > > - * Currently nothing to do here.
>> > > - */
>> > > + __virtio_clear_bit(vdev, VIRTIO_F_NOTIFICATION_DATA);
>> >
>> > Is there any restriction that prevents us from implementing
>> > VIRTIO_F_NOTIFICATION_DATA? (Spec seems doesn't limit us from this)
>>
>> Most likely, nothing.
>
> So pls code it up. It's the same format.
FWIW, the notification data needs to go via the third parameter of
kvm_hypercall3() in virtio_ccw_kvm_notify().
next prev parent reply other threads:[~2023-03-21 13:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-20 23:21 [PATCH v2] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support Viktor Prutyanov
2023-03-21 2:29 ` Jason Wang
2023-03-21 7:13 ` Michael S. Tsirkin
2023-03-21 9:00 ` Viktor Prutyanov
2023-03-21 9:07 ` Michael S. Tsirkin
2023-03-21 13:10 ` Cornelia Huck [this message]
2023-03-21 9:23 ` Michael S. Tsirkin
2023-03-21 11:49 ` Viktor Prutyanov
2023-03-21 12:21 ` Michael S. Tsirkin
2023-03-21 9:27 ` Michael S. Tsirkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87jzzamerk.fsf@redhat.com \
--to=cohuck@redhat.com \
--cc=farman@linux.ibm.com \
--cc=jasowang@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=mst@redhat.com \
--cc=pasic@linux.ibm.com \
--cc=viktor@daynix.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=yan@daynix.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).