linux-kernel - Re: [PATCH 1/1] vfio-ccw: Enable transparent CCW IPL from DASD

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Message-Id: <20200423155620.493cb7cb.pasic@linux.ibm.com>
Date:   Thu, 23 Apr 2020 15:56:20 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Jared Rossi <jrossi@...ux.ibm.com>
Cc:     Eric Farman <farman@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] vfio-ccw: Enable transparent CCW IPL from DASD

On Fri, 17 Apr 2020 14:29:39 -0400
Jared Rossi <jrossi@...ux.ibm.com> wrote:

> Remove the explicit prefetch check when using vfio-ccw devices.
> This check is not needed as all Linux channel programs are intended
> to use prefetch and will be executed in the same way regardless.

Hm. This is a guest thing or? So you basically say, it is OK to do
this, because you know that the guest is gonna be Linux and that it
the channel program is intended to use prefetch -- but the ORB supplied
by the guest that designates the channel program happens to state the
opposite.

Or am I missing something?

Regards,
Halil