linux-kernel - Re: [PATCH 1/2] vfio/mdev: add version field as mandatory attribute for mdev device

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Date:   Tue, 7 May 2019 10:51:26 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     "cjia@...dia.com" <cjia@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "aik@...abs.ru" <aik@...abs.ru>,
        "Zhengxiao.zx@...baba-inc.com" <Zhengxiao.zx@...baba-inc.com>,
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        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "eauger@...hat.com" <eauger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "eskultet@...hat.com" <eskultet@...hat.com>,
        "Yang, Ziye" <ziye.yang@...el.com>,
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        "Tian, Kevin" <kevin.tian@...el.com>,
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        "Liu, Changpeng" <changpeng.liu@...el.com>,
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        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "jonathan.davies@...anix.com" <jonathan.davies@...anix.com>,
        "He, Shaopeng" <shaopeng.he@...el.com>
Subject: Re: [PATCH 1/2] vfio/mdev: add version field as mandatory attribute
 for mdev device

On Tue, 7 May 2019 01:39:13 -0400
Yan Zhao <yan.y.zhao@...el.com> wrote:

> On Tue, Apr 30, 2019 at 11:29:08PM +0800, Cornelia Huck wrote:

> > If I followed the discussion correctly, I think you plan to drop this
> > format, don't you? I'd be happy if a vendor driver can use a simple
> > number without any prefixes if it so chooses.
> > 
> > I also like the idea of renaming this "migration_version" so that it is
> > clear we're dealing with versioning of the migration capability (and
> > not a version of the device or so).  
> hi Cornelia,
> sorry I just saw this mail after sending v2 of this patch set...
> yes, I dropped the common part and vendor driver now can define whatever it
> wishes to identify a device version.

Ok, I'll look at v2.

> However, I don't agree to rename it to "migration_version", as it still may
> bring some kind of confusing with the migration version a vendor driver is
> using, e.g. vendor driver changes migration code and increases that migration
> version.
> In fact, what info we want to get from this attribute is whether this mdev
> device is compatible with another mdev device, which is tied to device, and not
> necessarily bound to migration.
> 
> do you think so?

I'm not 100% convinced; but we can continue the discussion on v2.