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Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated dev
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices |
Date: |
Wed, 12 Oct 2016 09:59:55 -0600 |
On Wed, 12 Oct 2016 20:43:48 +0530
Kirti Wankhede <address@hidden> wrote:
> On 10/12/2016 7:22 AM, Tian, Kevin wrote:
> >> From: Kirti Wankhede [mailto:address@hidden
> >> Sent: Wednesday, October 12, 2016 4:45 AM
> >>>> +* mdev_supported_types:
> >>>> + List of current supported mediated device types and its details are
> >>>> added
> >>>> +in this directory in following format:
> >>>> +
> >>>> +|- <parent phy device>
> >>>> +|--- Vendor-specific-attributes [optional]
> >>>> +|--- mdev_supported_types
> >>>> +| |--- <type id>
> >>>> +| | |--- create
> >>>> +| | |--- name
> >>>> +| | |--- available_instances
> >>>> +| | |--- description /class
> >>>> +| | |--- [devices]
> >>>> +| |--- <type id>
> >>>> +| | |--- create
> >>>> +| | |--- name
> >>>> +| | |--- available_instances
> >>>> +| | |--- description /class
> >>>> +| | |--- [devices]
> >>>> +| |--- <type id>
> >>>> +| |--- create
> >>>> +| |--- name
> >>>> +| |--- available_instances
> >>>> +| |--- description /class
> >>>> +| |--- [devices]
> >>>> +
> >>>> +[TBD : description or class is yet to be decided. This will change.]
> >>>
> >>> I thought that in previous discussions we had agreed to drop
> >>> the <type id> concept and use the name as the unique identifier.
> >>> When reporting these types in libvirt we won't want to report
> >>> the type id values - we'll want the name strings to be unique.
> >>>
> >>
> >> The 'name' might not be unique but type_id will be. For example that Neo
> >> pointed out in earlier discussion, virtual devices can come from two
> >> different physical devices, end user would be presented with what they
> >> had selected but there will be internal implementation differences. In
> >> that case 'type_id' will be unique.
> >>
> >
> > Hi, Kirti, my understanding is that Neo agreed to use an unique type
> > string (if you still called it <type id>), and then no need of additional
> > 'name' field which can be put inside 'description' field. See below quote:
> >
>
> We had internal discussions about this within NVIDIA and found that
> 'name' might not be unique where as 'type_id' would be unique. I'm
> refering to Neo's mail after that, where Neo do pointed that out.
>
> https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg07714.html
Everyone not privy to those internal discussions, including me, seems to
think we dropped type_id and that if a vendor does not have a stable
name, they can compose some sort of stable type description based on the
name+id, or even vendor+id, ex. NVIDIA-11. So please share why we
haven't managed to kill off type_id yet. No matter what internal
representation each vendor driver has of "type_id" it seems possible
for it to come up with stable string to define a given configuration.
Thanks,
Alex
[Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/10
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Daniel P. Berrange, 2016/10/11
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/11
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Tian, Kevin, 2016/10/11
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/12
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices,
Alex Williamson <=
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/12
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Alex Williamson, 2016/10/12
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/13
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Alex Williamson, 2016/10/13
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Paolo Bonzini, 2016/10/13
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Alex Williamson, 2016/10/13
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Kirti Wankhede, 2016/10/13
- Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Alex Williamson, 2016/10/14
Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Tian, Kevin, 2016/10/12
Re: [Qemu-devel] [PATCH v8 4/6] docs: Add Documentation for Mediated devices, Jike Song, 2016/10/13