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Message-ID: <1e7a9e4a-6d4a-4328-9fe8-0826e6348729@linux.ibm.com>
Date: Thu, 26 Oct 2023 10:20:49 -0400
From: Tony Krowiak <akrowiak@...ux.ibm.com>
To: Christian Borntraeger <borntraeger@...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
On 10/26/23 09:25, Christian Borntraeger wrote:
>
>
> 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.
Will do.
>
>>
>>>
>>>> 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;
>>>> }
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