From: "Michael S. Tsirkin" <mst@redhat•com>
To: Xie Yongji <xieyongji@bytedance•com>
Cc: jasowang@redhat•com, stefanha@redhat•com, sgarzare@redhat•com,
parav@nvidia•com, hch@infradead•org,
christian.brauner@canonical•com, rdunlap@infradead•org,
willy@infradead•org, viro@zeniv•linux.org.uk, axboe@kernel•dk,
bcrl@kvack•org, corbet@lwn•net, mika.penttila@nextfour•com,
dan.carpenter@oracle•com, joro@8bytes•org,
gregkh@linuxfoundation•org, zhe.he@windriver•com,
xiaodong.liu@intel•com, joe@perches•com, robin.murphy@arm•com,
will@kernel•org, john.garry@huawei•com, songmuchun@bytedance•com,
virtualization@lists•linux-foundation.org,
netdev@vger•kernel.org, kvm@vger•kernel.org,
linux-fsdevel@vger•kernel.org, iommu@lists•linux-foundation.org,
linux-kernel@vger•kernel.org
Subject: Re: [PATCH v13 05/13] vdpa: Add reset callback in vdpa_config_ops
Date: Mon, 6 Sep 2021 01:55:56 -0400 [thread overview]
Message-ID: <20210906015524-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20210831103634.33-6-xieyongji@bytedance.com>
On Tue, Aug 31, 2021 at 06:36:26PM +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 <xieyongji@bytedance•com>
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
next prev parent reply other threads:[~2021-09-06 5:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 10:36 [PATCH v13 00/13] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-31 10:36 ` [PATCH v13 01/13] iova: Export alloc_iova_fast() and free_iova_fast() Xie Yongji
2021-08-31 10:36 ` [PATCH v13 02/13] eventfd: Export eventfd_wake_count to modules Xie Yongji
2021-09-01 2:50 ` Jason Wang
2021-08-31 10:36 ` [PATCH v13 03/13] file: Export receive_fd() " Xie Yongji
2021-09-05 15:57 ` Michael S. Tsirkin
2021-09-05 16:44 ` Al Viro
2021-08-31 10:36 ` [PATCH v13 04/13] vdpa: Fix some coding style issues Xie Yongji
2021-08-31 10:36 ` [PATCH v13 05/13] vdpa: Add reset callback in vdpa_config_ops Xie Yongji
2021-09-06 5:55 ` Michael S. Tsirkin [this message]
2021-09-06 6:09 ` Yongji Xie
2021-09-06 6:37 ` Michael S. Tsirkin
2021-09-06 7:06 ` Yongji Xie
2021-09-06 8:00 ` Michael S. Tsirkin
2021-09-06 8:45 ` Yongji Xie
2021-09-06 10:43 ` Michael S. Tsirkin
2021-09-06 12:13 ` Yongji Xie
2021-08-31 10:36 ` [PATCH v13 06/13] vhost-vdpa: Handle the failure of vdpa_reset() Xie Yongji
2021-08-31 10:36 ` [PATCH v13 07/13] vhost-iotlb: Add an opaque pointer for vhost IOTLB Xie Yongji
2021-08-31 10:36 ` [PATCH v13 08/13] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Xie Yongji
2021-08-31 10:36 ` [PATCH v13 09/13] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Xie Yongji
2021-08-31 10:36 ` [PATCH v13 10/13] vdpa: Support transferring virtual addressing during DMA mapping Xie Yongji
2021-08-31 10:36 ` [PATCH v13 11/13] vduse: Implement an MMU-based software IOTLB Xie Yongji
2021-08-31 10:36 ` [PATCH v13 12/13] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-31 10:36 ` [PATCH v13 13/13] Documentation: Add documentation for VDUSE Xie Yongji
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