linux-kernel - Re: [PATCH] vfio-ccw: process ssch with interrupts disabled

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Message-Id: <dd958a03-d5e8-c826-6fc6-7229c3acbe1e@linux.vnet.ibm.com>
Date:   Thu, 19 Apr 2018 14:01:09 +0200
From:   Halil Pasic <pasic@...ux.vnet.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Dong Jia Shi <bjsdjshi@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio-ccw: process ssch with interrupts disabled



On 04/13/2018 04:05 PM, Cornelia Huck wrote:
> When we call ssch, an interrupt might already be pending once we
> return from the START SUBCHANNEL instruction. Therefore we need to
> make sure interrupts are disabled until after we're done with our
> processing.
> 
> Note that the subchannel lock is the same as the ccwdevice lock that
> is mentioned in the documentation for ccw_device_start() and friends.
> 
> Signed-off-by: Cornelia Huck<cohuck@...hat.com>

Acked-by: Halil Pasic <pasic@...ux.vnet.ibm.com>