From: Jason Wang <jasowang@redhat.com>
To: Yongji Xie <xieyongji@bytedance.com>
Cc: "Stefan Hajnoczi" <stefanha@redhat.com>,
"Michael S. Tsirkin" <mst@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>,
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 v8 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace
Date: Fri, 2 Jul 2021 11:25:15 +0800 [thread overview]
Message-ID: <c7d3473c-f855-166b-f4da-47be5a329859@redhat.com> (raw)
In-Reply-To: <CACycT3v7pYXAFtijPgWCMZ2WXxjT2Y-DUwS3hN_T7dhfE5o_6g@mail.gmail.com>
在 2021/7/1 下午6:26, Yongji Xie 写道:
> On Thu, Jul 1, 2021 at 3:55 PM Jason Wang <jasowang@redhat.com> wrote:
>>
>> 在 2021/7/1 下午2:50, Yongji Xie 写道:
>>> On Wed, Jun 30, 2021 at 5:51 PM Stefan Hajnoczi <stefanha@redhat.com> wrote:
>>>> On Tue, Jun 29, 2021 at 10:59:51AM +0800, Yongji Xie wrote:
>>>>> On Mon, Jun 28, 2021 at 9:02 PM Stefan Hajnoczi <stefanha@redhat.com> wrote:
>>>>>> On Tue, Jun 15, 2021 at 10:13:30PM +0800, Xie Yongji wrote:
>>>>>>> +/* ioctls */
>>>>>>> +
>>>>>>> +struct vduse_dev_config {
>>>>>>> + char name[VDUSE_NAME_MAX]; /* vduse device name */
>>>>>>> + __u32 vendor_id; /* virtio vendor id */
>>>>>>> + __u32 device_id; /* virtio device id */
>>>>>>> + __u64 features; /* device features */
>>>>>>> + __u64 bounce_size; /* bounce buffer size for iommu */
>>>>>>> + __u16 vq_size_max; /* the max size of virtqueue */
>>>>>> The VIRTIO specification allows per-virtqueue sizes. A device can have
>>>>>> two virtqueues, where the first one allows up to 1024 descriptors and
>>>>>> the second one allows only 128 descriptors, for example.
>>>>>>
>>>>> Good point! But it looks like virtio-vdpa/virtio-pci doesn't support
>>>>> that now. All virtqueues have the same maximum size.
>>>> I see struct vpda_config_ops only supports a per-device max vq size:
>>>> u16 (*get_vq_num_max)(struct vdpa_device *vdev);
>>>>
>>>> virtio-pci supports per-virtqueue sizes because the struct
>>>> virtio_pci_common_cfg->queue_size register is per-queue (controlled by
>>>> queue_select).
>>>>
>>> Oh, yes. I miss queue_select.
>>>
>>>> I guess this is a question for Jason: will vdpa will keep this limitation?
>>>> If yes, then VDUSE can stick to it too without running into problems in
>>>> the future.
>>
>> I think it's better to extend the get_vq_num_max() per virtqueue.
>>
>> Currently, vDPA assumes the parent to have a global max size. This seems
>> to work on most of the parents but not vp-vDPA (which could be backed by
>> QEMU, in that case cvq's size is smaller).
>>
>> Fortunately, we haven't enabled had cvq support in the userspace now.
>>
>> I can post the fixes.
>>
> OK. If so, it looks like we need to support the per-vq configuration.
> I wonder if it's better to use something like: VDUSE_CREATE_DEVICE ->
> VDUSE_SETUP_VQ -> VDUSE_SETUP_VQ -> ... -> VDUSE_ENABLE_DEVICE to do
> initialization rather than only use VDUSE_CREATE_DEVICE.
This should be fine.
Thanks
>
> Thanks,
> Yongji
>
next prev parent reply other threads:[~2021-07-02 3:25 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-15 14:13 [PATCH v8 00/10] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-06-15 14:13 ` [PATCH v8 01/10] iova: Export alloc_iova_fast() and free_iova_fast(); Xie Yongji
2021-06-15 14:13 ` [PATCH v8 02/10] file: Export receive_fd() to modules Xie Yongji
2021-06-15 14:13 ` [PATCH v8 03/10] eventfd: Increase the recursion depth of eventfd_signal() Xie Yongji
2021-06-17 8:33 ` He Zhe
2021-06-18 3:29 ` Yongji Xie
2021-06-18 8:41 ` He Zhe
2021-06-18 8:44 ` [PATCH] eventfd: Enlarge recursion limit to allow vhost to work He Zhe
2021-07-03 8:31 ` Michael S. Tsirkin
2021-08-25 7:57 ` Yongji Xie
2021-06-15 14:13 ` [PATCH v8 04/10] vhost-iotlb: Add an opaque pointer for vhost IOTLB Xie Yongji
2021-06-15 14:13 ` [PATCH v8 05/10] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Xie Yongji
2021-06-15 14:13 ` [PATCH v8 06/10] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Xie Yongji
2021-06-15 14:13 ` [PATCH v8 07/10] vdpa: Support transferring virtual addressing during DMA mapping Xie Yongji
2021-06-15 14:13 ` [PATCH v8 08/10] vduse: Implement an MMU-based IOMMU driver Xie Yongji
2021-06-15 14:13 ` [PATCH v8 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-06-21 9:13 ` Jason Wang
2021-06-21 10:41 ` Yongji Xie
2021-06-22 5:06 ` Jason Wang
2021-06-22 7:22 ` Yongji Xie
2021-06-22 7:49 ` Jason Wang
2021-06-22 8:14 ` Yongji Xie
2021-06-23 3:30 ` Jason Wang
2021-06-23 5:50 ` Yongji Xie
2021-06-24 3:34 ` Jason Wang
2021-06-24 4:46 ` Yongji Xie
2021-06-24 8:13 ` Jason Wang
2021-06-24 9:16 ` Yongji Xie
2021-06-25 3:08 ` Jason Wang
2021-06-25 4:19 ` Yongji Xie
2021-06-28 4:40 ` Jason Wang
2021-06-29 2:26 ` Yongji Xie
2021-06-29 3:29 ` Jason Wang
2021-06-29 3:56 ` Yongji Xie
2021-06-29 4:03 ` Jason Wang
2021-06-24 14:46 ` Stefan Hajnoczi
2021-06-29 2:59 ` Yongji Xie
2021-06-30 9:51 ` Stefan Hajnoczi
2021-07-01 6:50 ` Yongji Xie
2021-07-01 7:55 ` Jason Wang
2021-07-01 10:26 ` Yongji Xie
2021-07-02 3:25 ` Jason Wang [this message]
2021-07-07 8:52 ` Stefan Hajnoczi
2021-07-07 9:19 ` Yongji Xie
2021-06-15 14:13 ` [PATCH v8 10/10] Documentation: Add documentation for VDUSE Xie Yongji
2021-06-24 13:01 ` Stefan Hajnoczi
2021-06-29 5:43 ` Yongji Xie
2021-06-30 10:06 ` Stefan Hajnoczi
2021-07-01 10:00 ` Yongji Xie
2021-07-01 13:15 ` Stefan Hajnoczi
2021-07-04 9:49 ` Yongji Xie
2021-07-05 3:36 ` Jason Wang
2021-07-05 12:49 ` Stefan Hajnoczi
2021-07-06 2:34 ` Jason Wang
2021-07-06 10:14 ` Stefan Hajnoczi
[not found] ` <CACGkMEs2HHbUfarum8uQ6wuXoDwLQUSXTsa-huJFiqr__4cwRg@mail.gmail.com>
[not found] ` <YOSOsrQWySr0andk@stefanha-x1.localdomain>
[not found] ` <100e6788-7fdf-1505-d69c-bc28a8bc7a78@redhat.com>
[not found] ` <YOVr801d01YOPzLL@stefanha-x1.localdomain>
2021-07-07 9:24 ` Jason Wang
2021-07-07 15:54 ` Stefan Hajnoczi
2021-07-08 4:17 ` Jason Wang
2021-07-08 9:06 ` Stefan Hajnoczi
2021-07-08 12:35 ` Yongji Xie
2021-07-06 3:04 ` Yongji Xie
2021-07-06 10:22 ` Stefan Hajnoczi
2021-07-07 9:09 ` Yongji Xie
2021-07-08 9:07 ` Stefan Hajnoczi
2021-06-24 15:12 ` [PATCH v8 00/10] Introduce VDUSE - vDPA Device in Userspace Stefan Hajnoczi
2021-06-29 3:15 ` Yongji Xie
2021-06-28 10:33 ` Liu Xiaodong
2021-06-28 4:35 ` Jason Wang
2021-06-28 5:54 ` Liu, Xiaodong
2021-06-29 4:10 ` Jason Wang
2021-06-29 7:56 ` Liu, Xiaodong
2021-06-29 8:14 ` Yongji Xie
2021-06-28 10:32 ` Yongji Xie
2021-06-29 4:12 ` Jason Wang
2021-06-29 6:40 ` Yongji Xie
2021-06-29 7:33 ` Jason Wang
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