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Date: Wed, 29 Nov 2023 18:45:32 +0800
From: "Ning, Hongyu" <hongyu.ning@...ux.intel.com>
To: Jason Wang <jasowang@...hat.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 2023/11/29 18:20, Jason Wang wrote:
> 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
> 

Oh, this patch works, WARNING and Call Trace are no more reproduced in 
the same Linux Guest Kernel setup.

>>
>>
>>>>
>>>>>
>>>>> 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(-)
>>>>>
>>>>
>>>
>>

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