Re: [Xen-devel] [PATCH] arm/vm_event: get/set registers

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 07/29/2016 05:11 PM, Julien Grall wrote:
> Which lead to my next question. For instance, we have an app A which is
> built for Xen 4.N and they want to also support Xen 4.(N + 1) which will
> set more registers and take advantage of it. How the app will
> differentiate the 2 versions?

We currenly have macros like VM_EVENT_INTERFACE_VERSION that can be
incremented so that applications can know at compile-time which
interface they get.

At runtime, I suppose we could use code similar to what runs when "xl
info" is called (which outputs xen_major, xen_minor and xen_extra, or
the complete xen_version).


Thanks,
Razvan

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