linux-kernel - Re: [PATCH 0/2] s390/vfio-ap: do not open code locks for VFIO_GROUP_NOTIFY_SET

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Date:   Mon, 2 Aug 2021 09:10:26 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     borntraeger@...ibm.com, cohuck@...hat.com,
        pasic@...ux.vnet.ibm.com, jjherne@...ux.ibm.com, jgg@...dia.com,
        alex.williamson@...hat.com, kwankhede@...dia.com, david@...hat.com,
        pbonzini@...hat.com, david@...hat.com, frankja@...ux.ibm.com,
        imbrenda@...ux.ibm.com
Subject: Re: [PATCH 0/2] s390/vfio-ap: do not open code locks for
 VFIO_GROUP_NOTIFY_SET_KVM notification

PING!

This patch will pre-req version 17 of a patch series I have waiting in 
the wings,
so I'd like to get this one merged ASAP. In particular, if a KVM 
maintainer can
take a look at the comments concerning the taking of the kvm->lock 
before the
matrix_mdev->lock it would be greatly appreciated. Those comments begin with
Message ID <20210727004329.3bcc7d4f.pasic@...ux.ibm.com> from Halil Pasic.

On 7/19/21 3:35 PM, Tony Krowiak wrote:
> This series is actually only comprised of a single patch to replace the
> open coded locks used during VFIO_GROUP_NOTIFY_SET_KVM notification. The
> first patch is included because it is a pre-req slotted to be merged but is
> not yet available in the kernel.
>
> Tony Krowiak (2):
>    s390/vfio-ap: r/w lock for PQAP interception handler function pointer
>    s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM
>      notification
>
>   arch/s390/include/asm/kvm_host.h      |   8 +-
>   arch/s390/kvm/kvm-s390.c              |  28 +++++-
>   arch/s390/kvm/priv.c                  |  10 +-
>   drivers/s390/crypto/vfio_ap_ops.c     | 127 +++++++++-----------------
>   drivers/s390/crypto/vfio_ap_private.h |   4 +-
>   5 files changed, 77 insertions(+), 100 deletions(-)
>