Re: [PATCH RFC] virtio: wrap config->reset calls

From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Hildenbrand <david@redhat.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>,
	nvdimm@lists.linux.dev, v9fs-developer@lists.sourceforge.net,
	Stefan Hajnoczi <stefanha@redhat.com>,
	kvm@vger.kernel.org, Dominique Martinet <asmadeus@codewreck.org>,
	David Airlie <airlied@linux.ie>,
	Viresh Kumar <vireshk@kernel.org>,
	Jason Wang <jasowang@redhat.com>,
	linux-remoteproc@vger.kernel.org, alsa-devel@alsa-project.org,
	dri-devel@lists.freedesktop.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	netdev@vger.kernel.org, Gerd Hoffmann <kraxel@redhat.com>,
	linux-scsi@vger.kernel.org, Will Deacon <will@kernel.org>,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Dave Jiang <dave.jiang@intel.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	linux-arm-kernel@lists.infradead.org,
	Miklos Szeredi <miklos@szeredi.hu>,
	Richard Weinberger <richard@nod.at>,
	Bartosz Golaszewski <brgl@bgdev.pl>,
	Takashi Iwai <tiwai@suse.com>, Gonglei <arei.gonglei@huawei.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	Jakub Kicinski <kuba@kernel.org>, Ira Weiny <ira.weiny@intel.com>,
	virtualization@lists.linux-foundation.org,
	Jeff Dike <jdike@addtoit.com>, Vivek Goyal <vgoyal@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	Ohad Ben-Cohen <ohad@wizery.com>,
	Johan Hedberg <johan.hedberg@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>, Amit Shah <amit@kernel.org>,
	Eric Van Hensbergen <ericvh@gmail.com>,
	Marcel Holtmann <marcel@holtmann.org>,
	linux-um@lists.infradead.org, linux-crypto@vger.kernel.org,
	linux-block@vger.kernel.org,
	Vishal Verma <vishal.l.verma@intel.com>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	Matt Mackall <mpm@selenic.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Cristian Marussi <cristian.marussi@arm.com>,
	Jens Axboe <axboe@kernel.dk>, Jie Deng <jie.deng@intel.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	linux-gpio@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-i2c@vger.kernel.org, linux-bluetooth@vger.kernel.org,
	iommu@lists.linux-foundation.org,
	Anton Yakovlev <anton.yakovlev@opensynergy.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Sudeep Holla <sudeep.holla@arm.com>,
	linux-fsdevel@vger.kernel.org,
	Paolo Bonzini <pbonzini@redhat.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	"Enrico Weigelt, metux IT consult" <info@metux.net>,
	"David S. Miller" <davem@davemloft.net>,
	Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH RFC] virtio: wrap config->reset calls
Date: Wed, 13 Oct 2021 08:17:49 -0400	[thread overview]
Message-ID: <20211013081632-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <2060bd96-5884-a1b5-9f29-7fe670dc088d@redhat.com>

On Wed, Oct 13, 2021 at 01:03:46PM +0200, David Hildenbrand wrote:
> On 13.10.21 12:55, Michael S. Tsirkin wrote:
> > This will enable cleanups down the road.
> > The idea is to disable cbs, then add "flush_queued_cbs" callback
> > as a parameter, this way drivers can flush any work
> > queued after callbacks have been disabled.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >   arch/um/drivers/virt-pci.c                 | 2 +-
> >   drivers/block/virtio_blk.c                 | 4 ++--
> >   drivers/bluetooth/virtio_bt.c              | 2 +-
> >   drivers/char/hw_random/virtio-rng.c        | 2 +-
> >   drivers/char/virtio_console.c              | 4 ++--
> >   drivers/crypto/virtio/virtio_crypto_core.c | 8 ++++----
> >   drivers/firmware/arm_scmi/virtio.c         | 2 +-
> >   drivers/gpio/gpio-virtio.c                 | 2 +-
> >   drivers/gpu/drm/virtio/virtgpu_kms.c       | 2 +-
> >   drivers/i2c/busses/i2c-virtio.c            | 2 +-
> >   drivers/iommu/virtio-iommu.c               | 2 +-
> >   drivers/net/caif/caif_virtio.c             | 2 +-
> >   drivers/net/virtio_net.c                   | 4 ++--
> >   drivers/net/wireless/mac80211_hwsim.c      | 2 +-
> >   drivers/nvdimm/virtio_pmem.c               | 2 +-
> >   drivers/rpmsg/virtio_rpmsg_bus.c           | 2 +-
> >   drivers/scsi/virtio_scsi.c                 | 2 +-
> >   drivers/virtio/virtio.c                    | 5 +++++
> >   drivers/virtio/virtio_balloon.c            | 2 +-
> >   drivers/virtio/virtio_input.c              | 2 +-
> >   drivers/virtio/virtio_mem.c                | 2 +-
> >   fs/fuse/virtio_fs.c                        | 4 ++--
> >   include/linux/virtio.h                     | 1 +
> >   net/9p/trans_virtio.c                      | 2 +-
> >   net/vmw_vsock/virtio_transport.c           | 4 ++--
> >   sound/virtio/virtio_card.c                 | 4 ++--
> >   26 files changed, 39 insertions(+), 33 deletions(-)
> > 
> > diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
> > index c08066633023..22c4d87c9c15 100644
> > --- a/arch/um/drivers/virt-pci.c
> > +++ b/arch/um/drivers/virt-pci.c
> > @@ -616,7 +616,7 @@ static void um_pci_virtio_remove(struct virtio_device *vdev)
> >   	int i;
> >           /* Stop all virtqueues */
> > -        vdev->config->reset(vdev);
> > +        virtio_reset_device(vdev);
> >           vdev->config->del_vqs(vdev);
> 
> Nit: virtio_device_reset()?
> 
> Because I see:
> 
> int virtio_device_freeze(struct virtio_device *dev);
> int virtio_device_restore(struct virtio_device *dev);
> void virtio_device_ready(struct virtio_device *dev)
> 
> But well, there is:
> void virtio_break_device(struct virtio_device *dev);

Exactly. I don't know what's best, so I opted for plain english :)

> -- 
> Thanks,
> 
> David / dhildenb