From: Halil Pasic <pasic@linux.ibm.com>
To: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
borntraeger@de.ibm.com, cohuck@redhat.com,
pasic@linux.vnet.ibm.com, jjherne@linux.ibm.com,
alex.williamson@redhat.com, kwankhede@nvidia.com,
david@redhat.com, pbonzini@redhat.com, frankja@linux.ibm.com,
imbrenda@linux.ibm.com
Subject: Re: [PATCH 2/2] s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM notification
Date: Wed, 28 Jul 2021 21:42:57 +0200 [thread overview]
Message-ID: <20210728214257.5e5c28c4.pasic@linux.ibm.com> (raw)
In-Reply-To: <a5eeac87-069d-171b-5558-3e99e7bda539@linux.ibm.com>
On Wed, 28 Jul 2021 09:43:03 -0400
Tony Krowiak <akrowiak@linux.ibm.com> wrote:
> This solution was suggested by Jason G and it does in fact resolve
> the lockdep splat encountered when starting an SE guest with
> access to crypto resources. There is a chance that the KVM lock
> can get held while waiting for the lock on the matrix_dev->mutex,
> but this does not seem like a grave concern to me.
Yes I agree. I was thinking along the lines: matrix modifications
via the sysfs take the matrix_dev->lock so the level of contention
may depend on what userspace is doing...
Regards,
Halil
next prev parent reply other threads:[~2021-07-28 19:43 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 19:35 [PATCH 0/2] s390/vfio-ap: do not open code locks for VFIO_GROUP_NOTIFY_SET_KVM notification Tony Krowiak
2021-07-19 19:35 ` [PATCH 1/2] s390/vfio-ap: r/w lock for PQAP interception handler function pointer Tony Krowiak
2021-08-18 17:03 ` Christian Borntraeger
2021-08-18 23:25 ` Halil Pasic
2021-08-19 6:56 ` Christian Borntraeger
2021-08-19 13:36 ` Tony Krowiak
2021-08-19 21:42 ` Halil Pasic
2021-08-23 13:08 ` Tony Krowiak
2021-08-19 13:20 ` Tony Krowiak
2021-08-19 17:54 ` Alex Williamson
2021-08-19 17:58 ` Jason Gunthorpe
2021-08-20 15:59 ` Tony Krowiak
2021-08-20 22:05 ` Tony Krowiak
2021-08-20 22:30 ` Jason Gunthorpe
2021-08-23 15:17 ` Tony Krowiak
2021-08-20 22:41 ` Alex Williamson
2021-08-23 20:51 ` Tony Krowiak
2021-07-19 19:35 ` [PATCH 2/2] s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM notification Tony Krowiak
2021-07-21 14:45 ` Halil Pasic
2021-07-22 13:09 ` Tony Krowiak
2021-07-23 14:26 ` Halil Pasic
2021-07-23 21:24 ` Tony Krowiak
2021-07-26 20:36 ` Halil Pasic
2021-07-26 22:03 ` Jason Gunthorpe
2021-07-26 22:43 ` Halil Pasic
2021-07-28 13:43 ` Tony Krowiak
2021-07-28 19:42 ` Halil Pasic [this message]
2021-07-30 13:33 ` Tony Krowiak
2021-07-27 6:54 ` Christoph Hellwig
2021-07-21 19:37 ` Jason J. Herne
2021-07-22 13:16 ` Tony Krowiak
2021-08-02 13:10 ` [PATCH 0/2] s390/vfio-ap: do not open code " Tony Krowiak
2021-08-02 13:53 ` Halil Pasic
2021-08-02 16:32 ` Tony Krowiak
2021-08-03 13:08 ` Jason Gunthorpe
2021-08-03 13:34 ` Tony Krowiak
2021-08-18 15:59 ` Christian Borntraeger
2021-08-18 16:39 ` Alex Williamson
2021-08-18 16:50 ` Christian Borntraeger
2021-08-18 22:52 ` Halil Pasic
2021-08-19 15:30 ` Cornelia Huck
2021-08-20 14:24 ` Tony Krowiak
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