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Tue, 22 Mar 2022 13:31:00 +0000 (GMT) Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F3B3F6E060; Tue, 22 Mar 2022 13:30:58 +0000 (GMT) Received: from [9.65.234.56] (unknown [9.65.234.56]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 22 Mar 2022 13:30:58 +0000 (GMT) Message-ID: <0f9ab763-9596-c157-8f1e-e65088bf3aab@linux.ibm.com> Date: Tue, 22 Mar 2022 09:30:58 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH v18 13/18] s390/vfio-ap: implement in-use callback for vfio_ap driver Content-Language: en-US To: jjherne@linux.ibm.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, mjrosato@linux.ibm.com, pasic@linux.ibm.com, alex.williamson@redhat.com, kwankhede@nvidia.com, fiuczy@linux.ibm.com References: <20220215005040.52697-1-akrowiak@linux.ibm.com> <20220215005040.52697-14-akrowiak@linux.ibm.com> <37e98e6e-35a7-a77a-b057-e19b307c631a@linux.ibm.com> From: Tony Krowiak In-Reply-To: <37e98e6e-35a7-a77a-b057-e19b307c631a@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ld6WgwifEOk6QCcEriFpJGHb8n3IZHSk X-Proofpoint-ORIG-GUID: KDkUGfMlekwWBt1i2Hg0TIl3E6zSU8Lp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.850,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-22_04,2022-03-22_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 malwarescore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 phishscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203220076 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/22/22 09:13, Jason J. Herne wrote: > On 2/14/22 19:50, Tony Krowiak wrote: > ... >> diff --git a/drivers/s390/crypto/vfio_ap_ops.c >> b/drivers/s390/crypto/vfio_ap_ops.c >> index e9f7ec6fc6a5..63dfb9b89581 100644 >> --- a/drivers/s390/crypto/vfio_ap_ops.c >> +++ b/drivers/s390/crypto/vfio_ap_ops.c >> @@ -617,10 +617,32 @@ static int >> vfio_ap_mdev_verify_no_sharing(unsigned long *mdev_apm, >>       return 0; >>   } >>   +/** >> + * vfio_ap_mdev_validate_masks - verify that the APQNs assigned to >> the mdev are >> + *                 not reserved for the default zcrypt driver and >> + *                 are not assigned to another mdev. >> + * >> + * @matrix_mdev: the mdev to which the APQNs being validated are >> assigned. >> + * >> + * Return: One of the following values: >> + * o the error returned from the >> ap_apqn_in_matrix_owned_by_def_drv() function, >> + *   most likely -EBUSY indicating the ap_perms_mutex lock is >> already held. >> + * o EADDRNOTAVAIL if an APQN assigned to @matrix_mdev is reserved >> for the >> + *           zcrypt default driver. >> + * o EADDRINUSE if an APQN assigned to @matrix_mdev is assigned to >> another mdev >> + * o A zero indicating validation succeeded. >> + */ >>   static int vfio_ap_mdev_validate_masks(struct ap_matrix_mdev >> *matrix_mdev) >>   { >> -    if (ap_apqn_in_matrix_owned_by_def_drv(matrix_mdev->matrix.apm, >> -                           matrix_mdev->matrix.aqm)) >> +    int ret; >> + >> +    ret = ap_apqn_in_matrix_owned_by_def_drv(matrix_mdev->matrix.apm, >> +                         matrix_mdev->matrix.aqm); >> + >> +    if (ret < 0) >> +        return ret; >> + >> +    if (ret == 1) >>           return -EADDRNOTAVAIL; > > I took a look at ap_apqn_in_matrix_owned_by_def_drv(). It appears that > this function > can only ever return 0 or 1. This patch is changed to watch for a > negative return > value from ap_apqn_in_matrix_owned_by_def_drv(). Am I missing something? That's odd, careless error, I'll fix it. > >