Re: [virtio-dev] [PATCH v3 0/4] introduce virtio vhost-user backend device type

[Nikos Dragazis <ndragazis@arrikto.com>]

On 21/6/19 11:43 μ.μ., Michael S. Tsirkin wrote:
> On Wed, Jun 19, 2019 at 03:54:30PM +0100, Stefan Hajnoczi wrote:
>> On Sat, May 11, 2019 at 09:47:36PM +0300, Nikos Dragazis wrote:
>>> Hi everyone,
>>>
>>> this PATCH presents an updated version of the RFC virtio device spec for
>>> the virtio-vhost-user device. The initial RFC implementation can be
>>> found here: [1].
>>>
>>> This PATCH is split into four parts:
>>>
>>> 1. the first commit is just a refactored version of the initial RFC
>>> implementation [1]. I just moved the device spec into a separate .tex
>>> file and changed the device id from #24 to #28 since the ids #24-#27 are
>>> reserved.
>>>
>>> 2. the second commit fixes some minor issues with the device spec. This
>>> is quite straightforward.
>>>
>>> 3. the third commit enhances the notification capability with some
>>> device/driver requirements. This makes sense because the notification
>>> capability behaves similarly to the MSI-X capability, thereby having
>>> some requirements that need to be mentioned.
>>>
>>> 4. the fourth commit synchronizes the shared memory capability with a
>>> recent patch [2] that attempts to standardize a standalone
>>> SHARED_MEMORY_CFG virtio capability.
>>>
>>> v3 changes:
>>>  * Device Requirements for the Notification Capability: point out the
>>>    difference between the MSI-X Table Size stored in the Message Control
>>>    register of the MSI-X capability structure and the actual MSI-X Table
>>>    Size
>>>
>>> v2 changes:
>>>  * Change device id from #25 to #28
>>>
>>> Looking forward to your comments.
>> I'm happy with v3.
>>
>> Any other comments or shall we proceed to a vote?
>>
>> Stefan
> I think we need to wait for shared memory part to be finalized, right?
>

Michael,

given that David's patchset for the shared memory regions has been
approved, I think we can start discussing on the spec for the
virtio-vhost-user device. A link to the latest version is here: [1].

I really think that this device is useful and should be part of the
VIRTIO specification. I will submit a fifth version of the patchset soon
with some minor changes that seem reasonable to me.

Best regards,
Nikos

[1] https://lists.oasis-open.org/archives/virtio-dev/201906/msg00036.html

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