Re: [Xen-devel] [PATCH v6 15/18] xen: add a mechanism to automatically create XenDevice-s...

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Mon, Dec 17, 2018 at 01:30:08PM +0000, Paul Durrant wrote:
> ...that maintains compatibility with existing Xen toolstacks.
> 
> Xen toolstacks instantiate PV backends by simply writing information into
> xenstore and expecting a backend implementation to be watching for this.
> 
> This patch adds a new 'xen-backend' module to allow individual XenDevice
> implementations to register create and destroy functions. The creator
> will be called when a tool-stack instantiates a new backend in this way,
> and the destructor will then be called after the resulting XenDevice
> object is unrealized.
> 
> To support this it is also necessary to add new watchers into the XenBus
> implementation to handle enumeration of new backends and also destruction
> of XenDevice-s when the toolstack sets the backend 'online' key to 0.
> 
> NOTE: This patch only adds the framework. A subsequent patch will add a
>       creator function for xen-block devices.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

-- 
Anthony PERARD

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