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From: Yongji Xie <xieyongji@bytedance.com>
To: Jason Wang <jasowang@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Stefano Garzarella" <sgarzare@redhat.com>,
	"Parav Pandit" <parav@nvidia.com>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Christian Brauner" <christian.brauner@canonical.com>,
	"Randy Dunlap" <rdunlap@infradead.org>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Jens Axboe" <axboe@kernel.dk>,
	bcrl@kvack.org, "Jonathan Corbet" <corbet@lwn.net>,
	"Mika Penttilä" <mika.penttila@nextfour.com>,
	"Dan Carpenter" <dan.carpenter@oracle.com>,
	joro@8bytes.org, "Greg KH" <gregkh@linuxfoundation.org>,
	"He Zhe" <zhe.he@windriver.com>,
	"Liu Xiaodong" <xiaodong.liu@intel.com>,
	"Joe Perches" <joe@perches.com>,
	"Robin Murphy" <robin.murphy@arm.com>,
	songmuchun@bytedance.com,
	virtualization <virtualization@lists.linux-foundation.org>,
	netdev@vger.kernel.org, kvm <kvm@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v11 04/12] vdpa: Add reset callback in vdpa_config_ops
Date: Mon, 23 Aug 2021 15:44:59 +0800	[thread overview]
Message-ID: <CACycT3sjeWhUmHSAeniSnMO6Jus_d1p3eO--y0qc9FYP_cDMzQ@mail.gmail.com> (raw)
In-Reply-To: <4470fdac-89fb-1216-78d7-6335c3bfeb22@redhat.com>

On Mon, Aug 23, 2021 at 2:31 PM Jason Wang <jasowang@redhat.com> wrote:
>
>
> 在 2021/8/18 下午8:06, Xie Yongji 写道:
> > This adds a new callback to support device specific reset
> > behavior. The vdpa bus driver will call the reset function
> > instead of setting status to zero during resetting if device
> > driver supports the new callback.
> >
> > Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
> > ---
> >   drivers/vhost/vdpa.c |  9 +++++++--
> >   include/linux/vdpa.h | 11 ++++++++++-
> >   2 files changed, 17 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > index b07aa161f7ad..b1c91b4db0ba 100644
> > --- a/drivers/vhost/vdpa.c
> > +++ b/drivers/vhost/vdpa.c
> > @@ -157,7 +157,7 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> >       struct vdpa_device *vdpa = v->vdpa;
> >       const struct vdpa_config_ops *ops = vdpa->config;
> >       u8 status, status_old;
> > -     int nvqs = v->nvqs;
> > +     int ret, nvqs = v->nvqs;
> >       u16 i;
> >
> >       if (copy_from_user(&status, statusp, sizeof(status)))
> > @@ -172,7 +172,12 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
> >       if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
> >               return -EINVAL;
> >
> > -     ops->set_status(vdpa, status);
> > +     if (status == 0 && ops->reset) {
> > +             ret = ops->reset(vdpa);
> > +             if (ret)
> > +                     return ret;
> > +     } else
> > +             ops->set_status(vdpa, status);
> >
> >       if ((status & VIRTIO_CONFIG_S_DRIVER_OK) && !(status_old & VIRTIO_CONFIG_S_DRIVER_OK))
> >               for (i = 0; i < nvqs; i++)
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index 8a645f8f4476..af7ea5ad795f 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -196,6 +196,9 @@ struct vdpa_iova_range {
> >    *                          @vdev: vdpa device
> >    *                          Returns the iova range supported by
> >    *                          the device.
> > + * @reset:                   Reset device (optional)
> > + *                           @vdev: vdpa device
> > + *                           Returns integer: success (0) or error (< 0)
>
>
> It looks to me we'd better make this mandatory. This help to reduce the
> confusion for the parent driver.
>

OK, will do it in next version.

Thanks,
Yongji

  reply	other threads:[~2021-08-23  7:45 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 12:06 [PATCH v11 00/12] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-18 12:06 ` [PATCH v11 01/12] iova: Export alloc_iova_fast() and free_iova_fast() Xie Yongji
2021-08-23  6:24   ` Jason Wang
2021-08-24 18:08   ` Michael S. Tsirkin
2021-08-25  9:55     ` Will Deacon
2021-08-25 10:39       ` John Garry
2021-08-25 12:17         ` Yongji Xie
2021-08-27  9:03           ` John Garry
2021-08-18 12:06 ` [PATCH v11 02/12] file: Export receive_fd() to modules Xie Yongji
2021-08-18 12:06 ` [PATCH v11 03/12] vdpa: Fix some coding style issues Xie Yongji
2021-08-23  6:27   ` Jason Wang
2021-08-24 11:09   ` Stefano Garzarella
2021-08-18 12:06 ` [PATCH v11 04/12] vdpa: Add reset callback in vdpa_config_ops Xie Yongji
2021-08-23  6:31   ` Jason Wang
2021-08-23  7:44     ` Yongji Xie [this message]
2021-08-18 12:06 ` [PATCH v11 05/12] vhost-vdpa: Handle the failure of vdpa_reset() Xie Yongji
2021-08-23  6:32   ` Jason Wang
2021-08-24 11:12   ` Stefano Garzarella
2021-08-18 12:06 ` [PATCH v11 06/12] vhost-iotlb: Add an opaque pointer for vhost IOTLB Xie Yongji
2021-08-18 12:06 ` [PATCH v11 07/12] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Xie Yongji
2021-08-18 12:06 ` [PATCH v11 08/12] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Xie Yongji
2021-08-18 12:06 ` [PATCH v11 09/12] vdpa: Support transferring virtual addressing during DMA mapping Xie Yongji
2021-08-18 12:06 ` [PATCH v11 10/12] vduse: Implement an MMU-based software IOTLB Xie Yongji
2021-08-27  8:57   ` John Garry
2021-08-27  9:25     ` Yongji Xie
2021-08-18 12:06 ` [PATCH v11 11/12] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-23  6:56   ` Jason Wang
2021-08-24 18:10   ` Michael S. Tsirkin
2021-08-25  5:37     ` Yongji Xie
2021-08-18 12:06 ` [PATCH v11 12/12] Documentation: Add documentation for VDUSE Xie Yongji
2021-08-23  6:57   ` Jason Wang
2021-08-23  7:54   ` Jason Wang

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