linux-kernel - Re: [PATCH v2 1/3] s390/vfio-ap: unpin pages on gisc registration failure

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Date:   Thu, 26 Oct 2023 15:25:18 +0200
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     jjherne@...ux.ibm.com, pasic@...ux.ibm.com, frankja@...ux.ibm.com,
        imbrenda@...ux.ibm.com, david@...hat.com,
        Matthew Rosato <mjrosato@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/3] s390/vfio-ap: unpin pages on gisc registration
 failure



Am 26.10.23 um 15:16 schrieb Tony Krowiak:
> 
> 
> On 10/26/23 08:18, Christian Borntraeger wrote:
>>
>>
>> Am 18.10.23 um 15:38 schrieb Tony Krowiak:
>>> From: Anthony Krowiak <akrowiak@...ux.ibm.com>
>>>
>>> In the vfio_ap_irq_enable function, after the page containing the
>>> notification indicator byte (NIB) is pinned, the function attempts
>>> to register the guest ISC. If registration fails, the function sets the
>>> status response code and returns without unpinning the page containing
>>> the NIB. In order to avoid a memory leak, the NIB should be unpinned before
>>> returning from the vfio_ap_irq_enable function.
>>>
>>> Signed-off-by: Janosch Frank <frankja@...ux.ibm.com>
>>
>> Where is Janoschs signed off coming from here?
> 
> Janosch found this and composed the patch originally. I just tweaked the description and posted it.

So we should add

Co-developed-by: Janosch Frank <frankja@...ux.ibm.com>

in front of Janoschs signoff.

> 
>>
>>> Signed-off-by: Anthony Krowiak <akrowiak@...ux.ibm.com>
>>> Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
>>> Fixes: 783f0a3ccd79 ("s390/vfio-ap: add s390dbf logging to the vfio_ap_irq_enable function")
>>> Cc: <stable@...r.kernel.org>
>>> ---
>>>   drivers/s390/crypto/vfio_ap_ops.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>>> index 4db538a55192..9cb28978c186 100644
>>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>>> @@ -457,6 +457,7 @@ static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
>>>           VFIO_AP_DBF_WARN("%s: gisc registration failed: nisc=%d, isc=%d, apqn=%#04x\n",
>>>                    __func__, nisc, isc, q->apqn);
>>> +        vfio_unpin_pages(&q->matrix_mdev->vdev, nib, 1);
>>>           status.response_code = AP_RESPONSE_INVALID_GISA;
>>>           return status;
>>>       }