Re: [Xen-devel] [PATCH] kbdif: Define "feature-raw-pointer" and "request-raw-pointer"

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

Hi, Owen!

On 07/03/2017 03:57 PM, Owen Smith wrote:
> determine the difference between older
> backends and newer backends. In the case I'm interested in, the difference
> between old QEMU vkbd backend which blocks waiting for the vfb device, which
> is not present on HVM guests, and a newer QEMU backend
For how long will it remain "new" and what will be the
next patch for yet another new backend?
So, in addition to your patch I would suggest we add backend
type and its version to get the information you need and rely
on that deterministically, not making indirect decisions on
if the pointer is raw for new backend only.
Please see [1] where backend "type" entry was discussed.

BTW, we are working on decoupling QEMU's vkbd from vfb
as it is required for vkbd to work with vdispl, not vfb,
so from having type and version we will also benefit.

Thank you,
Oleksandr

[1] https://patchwork.kernel.org/patch/9674807/

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