From: Tony Krowiak <akrowiak@linux.ibm.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: 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,
frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com,
hca@linux.ibm.com
Subject: Re: [PATCH] s390/vfio-ap: do not use open locks during VFIO_GROUP_NOTIFY_SET_KVM notification
Date: Mon, 28 Jun 2021 14:20:55 -0400 [thread overview]
Message-ID: <cc14f238-ba11-e388-06ec-027912fc313c@linux.ibm.com> (raw)
In-Reply-To: <20210628173448.GG4459@nvidia.com>
On 6/28/21 1:34 PM, Jason Gunthorpe wrote:
> On Fri, Jun 25, 2021 at 06:07:58PM -0400, Tony Krowiak wrote:
>> static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
>> {
>> + mutex_lock(&matrix_dev->lock);
>>
>> + if ((matrix_mdev->kvm) && (matrix_mdev->kvm->arch.crypto.crycbd)) {
>> mutex_unlock(&matrix_dev->lock);
>> + down_write(&matrix_mdev->kvm->arch.crypto.pqap_hook_rwsem);
>> + matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
>> + up_write(&matrix_mdev->kvm->arch.crypto.pqap_hook_rwsem);
>>
>> + kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
>>
>> mutex_lock(&matrix_dev->lock);
>> vfio_ap_mdev_reset_queues(matrix_mdev->mdev);
>> kvm_put_kvm(matrix_mdev->kvm);
>> matrix_mdev->kvm = NULL;
>> + mutex_unlock(&matrix_dev->lock);
>> }
> Doesn't a flow exit the function with matrix_dev->lock held he
How can that happen? What flow?
>
> Write it with 'success oriented flow'
I'm not sure what you mean, can you clarify this statement?
>
> I didn't check if everything makes sense, but it sure looks clean.
>
> Jason
next prev parent reply other threads:[~2021-06-28 18:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-25 22:07 [PATCH] s390/vfio-ap: do not use open locks during VFIO_GROUP_NOTIFY_SET_KVM notification Tony Krowiak
2021-06-28 17:34 ` Jason Gunthorpe
2021-06-28 18:20 ` Tony Krowiak [this message]
2021-06-28 18:22 ` Jason Gunthorpe
2021-06-28 18:27 ` Tony Krowiak
2021-06-28 20:29 ` Halil Pasic
2021-06-30 14:31 ` Tony Krowiak
2021-06-30 22:39 ` Halil Pasic
2021-07-01 14:28 ` Tony Krowiak
2021-07-05 14:13 ` Jason Gunthorpe
2021-07-06 13:39 ` Tony Krowiak
2021-07-06 13:49 ` Jason Gunthorpe
2021-07-06 22:43 ` Tony Krowiak
2021-06-29 13:21 ` Jason J. Herne
2021-06-30 11:55 ` Jason Gunthorpe
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