linux-kernel - Re: [PATCH v2 1/1] s390: vfio-ccw: push down unsupported IDA check

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Message-ID: <20180517114256.0ee945c1.cohuck@redhat.com>
Date:   Thu, 17 May 2018 11:42:56 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Halil Pasic <pasic@...ux.ibm.com>
Cc:     Dong Jia Shi <bjsdjshi@...ux.ibm.com>,
        "Jason J. Herne" <jjherne@...ux.ibm.com>,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] s390: vfio-ccw: push down unsupported IDA check

On Wed, 16 May 2018 19:33:42 +0200
Halil Pasic <pasic@...ux.ibm.com> wrote:

> There is at least one relevant guest OS that doesn't set the IDA flags in
> the ORB as we would like them, but never uses any IDA. So instead of
> saying -EOPNOTSUPP when observing an ORB, such that a channel program
> specified by it could be a not supported one, let us say -EOPNOTSUPP only
> if the channel program is a not supported one.
> 
> Of course, the real solution would be doing proper translation for all
> IDA. This is possible, but given the current code not straight forward.
> 
> Signed-off-by: Halil Pasic <pasic@...ux.ibm.com>
> Tested-by: Jason J. Herne <jjherne@...ux.ibm.com>
> ---
> ---
>  drivers/s390/cio/vfio_ccw_cp.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)

Thanks, applied.