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Date: Wed, 29 Nov 2023 18:20:31 +0800
From: Jason Wang <jasowang@...hat.com>
To: "Ning, Hongyu" <hongyu.ning@...ux.intel.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, xuanzhuo@...ux.alibaba.com, 
	Linus Torvalds <torvalds@...ux-foundation.org>, kvm@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, eperezma@...hat.com, shannon.nelson@....com, 
	yuanyaogoog@...omium.org, yuehaibing@...wei.com, 
	kirill.shutemov@...ux.intel.com, sathyanarayanan.kuppuswamy@...ux.intel.com, 
	alexander.shishkin@...ux.intel.com
Subject: Re: [GIT PULL] virtio: features

On Wed, Nov 29, 2023 at 6:12 PM Ning, Hongyu
<hongyu.ning@...ux.intel.com> wrote:
>
>
> On 2023/11/29 17:16, Jason Wang wrote:
> > On Wed, Nov 29, 2023 at 5:05 PM Ning, Hongyu
> > <hongyu.ning@...ux.intel.com> wrote:
> >>
> >>
> >>
> >> On 2023/9/4 6:13, Michael S. Tsirkin wrote:
> >>> The following changes since commit 2dde18cd1d8fac735875f2e4987f11817cc0bc2c:
> >>>
> >>>     Linux 6.5 (2023-08-27 14:49:51 -0700)
> >>>
> >>> are available in the Git repository at:
> >>>
> >>>     https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git tags/for_linus
> >>>
> >>> for you to fetch changes up to 1acfe2c1225899eab5ab724c91b7e1eb2881b9ab:
> >>>
> >>>     virtio_ring: fix avail_wrap_counter in virtqueue_add_packed (2023-09-03 18:10:24 -0400)
> >>>
> >>> ----------------------------------------------------------------
> >>> virtio: features
> >>>
> >>> a small pull request this time around, mostly because the
> >>> vduse network got postponed to next relase so we can be sure
> >>> we got the security store right.
> >>>
> >>> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> >>>
> >>> ----------------------------------------------------------------
> >>> Eugenio Pérez (4):
> >>>         vdpa: add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK flag
> >>>         vdpa: accept VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK backend feature
> >>>         vdpa: add get_backend_features vdpa operation
> >>>         vdpa_sim: offer VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK
> >>>
> >>> Jason Wang (1):
> >>>         virtio_vdpa: build affinity masks conditionally
> >>>
> >>> Xuan Zhuo (12):
> >>>         virtio_ring: check use_dma_api before unmap desc for indirect
> >>>         virtio_ring: put mapping error check in vring_map_one_sg
> >>>         virtio_ring: introduce virtqueue_set_dma_premapped()
> >>>         virtio_ring: support add premapped buf
> >>>         virtio_ring: introduce virtqueue_dma_dev()
> >>>         virtio_ring: skip unmap for premapped
> >>>         virtio_ring: correct the expression of the description of virtqueue_resize()
> >>>         virtio_ring: separate the logic of reset/enable from virtqueue_resize
> >>>         virtio_ring: introduce virtqueue_reset()
> >>>         virtio_ring: introduce dma map api for virtqueue
> >>>         virtio_ring: introduce dma sync api for virtqueue
> >>>         virtio_net: merge dma operations when filling mergeable buffers
> >>
> >> Hi,
> >> above patch (upstream commit 295525e29a5b) seems causing a virtnet
> >> related Call Trace after WARNING from kernel/dma/debug.c.
> >>
> >> details (log and test setup) tracked in
> >> https://bugzilla.kernel.org/show_bug.cgi?id=218204
> >>
> >> it's recently noticed in a TDX guest testing since v6.6.0 release cycle
> >> and can still be reproduced in latest v6.7.0-rc3.
> >>
> >> as local bisects results show, above WARNING and Call Trace is linked
> >> with this patch, do you mind to take a look?
> >
> > Looks like virtqueue_dma_sync_single_range_for_cpu() use
> > DMA_BIDIRECTIONAL unconditionally.
> >
> > We should use dir here.
> >
> > Mind to try?
> >
> > Thanks
> >
>
> sure, but what I see in the code
> virtqueue_dma_sync_single_range_for_cpu() is using DMA_FROM_DEVICE,
> probably I misunderstood your point?
>
> Please let me know any patch/setting to try here.

Something like attached.  (Not even compiling test).

Thanks

>
>
> >>
> >>>
> >>> Yuan Yao (1):
> >>>         virtio_ring: fix avail_wrap_counter in virtqueue_add_packed
> >>>
> >>> Yue Haibing (1):
> >>>         vdpa/mlx5: Remove unused function declarations
> >>>
> >>>    drivers/net/virtio_net.c           | 230 ++++++++++++++++++---
> >>>    drivers/vdpa/mlx5/core/mlx5_vdpa.h |   3 -
> >>>    drivers/vdpa/vdpa_sim/vdpa_sim.c   |   8 +
> >>>    drivers/vhost/vdpa.c               |  15 +-
> >>>    drivers/virtio/virtio_ring.c       | 412 ++++++++++++++++++++++++++++++++-----
> >>>    drivers/virtio/virtio_vdpa.c       |  17 +-
> >>>    include/linux/vdpa.h               |   4 +
> >>>    include/linux/virtio.h             |  22 ++
> >>>    include/uapi/linux/vhost_types.h   |   4 +
> >>>    9 files changed, 625 insertions(+), 90 deletions(-)
> >>>
> >>
> >
>

Download attachment "0001-virtio_ring-fix-DMA-dir-during-sync.patch" of type "application/octet-stream" (834 bytes)

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