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Tsirkin" To: Xie Yongji Subject: Re: [PATCH v12 05/13] vdpa: Add reset callback in vdpa_config_ops Message-ID: <20210906015243-mutt-send-email-mst@kernel.org> References: <20210830141737.181-1-xieyongji@bytedance.com> <20210830141737.181-6-xieyongji@bytedance.com> MIME-Version: 1.0 In-Reply-To: <20210830141737.181-6-xieyongji@bytedance.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: kvm@vger.kernel.org, jasowang@redhat.com, virtualization@lists.linux-foundation.org, christian.brauner@canonical.com, will@kernel.org, corbet@lwn.net, willy@infradead.org, hch@infradead.org, dan.carpenter@oracle.com, sgarzare@redhat.com, xiaodong.liu@intel.com, linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, stefanha@redhat.com, songmuchun@bytedance.com, axboe@kernel.dk, zhe.he@windriver.com, gregkh@linuxfoundation.org, rdunlap@infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, bcrl@kvack.org, netdev@vger.kernel.org, joe@perches.com, robin.murphy@arm.com, mika.penttila@nextfour.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, Aug 30, 2021 at 10:17:29PM +0800, Xie Yongji wrote: > 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. > > Signed-off-by: Xie Yongji This does gloss over a significant change though: > @@ -348,12 +352,12 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev) > return vdev->dma_dev; > } > > -static inline void vdpa_reset(struct vdpa_device *vdev) > +static inline int vdpa_reset(struct vdpa_device *vdev) > { > const struct vdpa_config_ops *ops = vdev->config; > > vdev->features_valid = false; > - ops->set_status(vdev, 0); > + return ops->reset(vdev); > } > > static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features) Unfortunately this breaks virtio_vdpa: static void virtio_vdpa_reset(struct virtio_device *vdev) { struct vdpa_device *vdpa = vd_get_vdpa(vdev); vdpa_reset(vdpa); } and there's no easy way to fix this, kernel can't recover from a reset failure e.g. during driver unbind. Find a way to disable virtio_vdpa for now? > -- > 2.11.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu