Re: [PATCH v4 2/2] s390/vfio-ap: control access to PQAP(AQIC) interception handler

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To: "Jason J. Herne" <jjherne@xxxxxxxxxxxxx>
Subject: Re: [PATCH v4 2/2] s390/vfio-ap: control access to PQAP(AQIC) interception handler
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Tue, 25 May 2021 10:26:28 -0300
Cc: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, borntraeger@xxxxxxxxxx, cohuck@xxxxxxxxxx, pasic@xxxxxxxxxxxxxxxxxx, alex.williamson@xxxxxxxxxx, kwankhede@xxxxxxxxxx, frankja@xxxxxxxxxxxxx, david@xxxxxxxxxx, imbrenda@xxxxxxxxxxxxx, hca@xxxxxxxxxxxxx
In-reply-to: <20df4cd0-7859-4727-42bd-9ef419455039@linux.ibm.com>
References: <20210521193648.940864-1-akrowiak@linux.ibm.com> <20210521193648.940864-3-akrowiak@linux.ibm.com> <5d15fdf2-aee8-4e6c-c3e1-f07c76ce5974@linux.ibm.com> <20df4cd0-7859-4727-42bd-9ef419455039@linux.ibm.com>

On Tue, May 25, 2021 at 09:24:59AM -0400, Jason J. Herne wrote:
> change the function pointer to point to vfio_ap_ops:handle_pqap(). When we
> unload the module we change the function pointer back to the stub.  The
> updates should be atomic operations so no lock needed, right?

No

Jason

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References:
- [PATCH v4 0/2] s390/vfio-ap: fix memory leak in mdev remove callback
  - From: Tony Krowiak
- [PATCH v4 2/2] s390/vfio-ap: control access to PQAP(AQIC) interception handler
  - From: Tony Krowiak
- Re: [PATCH v4 2/2] s390/vfio-ap: control access to PQAP(AQIC) interception handler
  - From: Jason J. Herne
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