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Mon, 2 Jan 2023 09:34:52 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6BCE920043; Mon, 2 Jan 2023 09:34:52 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 2 Jan 2023 09:34:52 +0000 (GMT) From: Niklas Schnelle To: Alex Williamson , Cornelia Huck Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Matthew Rosato , Pierre Morel , =?utf-8?q?Christian_Borntr=C3=A4ger?= Subject: [PATCH 0/1] vfio/type1: Fix vfio-pci pass-through of ISM devices Date: Mon, 2 Jan 2023 10:34:51 +0100 Message-Id: <20230102093452.761185-1-schnelle@linux.ibm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: -z9M2Ix92QaTuiIfZD1cMZNoiVOgTmAi X-Proofpoint-GUID: 8OpXm3nV8b6YMWYCUPC4XIURxRC8t9kh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2023-01-02_05,2022-12-30_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=711 phishscore=0 adultscore=0 bulkscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 clxscore=1015 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301020086 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS 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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1753902957667084738?= X-GMAIL-MSGID: =?utf-8?q?1753902957667084738?= Hi Alex, Since commit cbf7827bc5dc ("iommu/s390: Fix potential s390_domain aperture shrinking") the s390 IOMMU driver uses a reserved region instead of an artificially shrunk aperture to restrict IOMMU use based on the system provided DMA ranges of devices. While this is more aligned with the common code use of apertures and reserved regions it turns out this currently breaks vfio-pci pass-through of our special virtual ISM PCI device. Investigation showed that this is due to vfio_test_domain_fgsp() ignoring the IOMMU reserved regions and mapping IOVA address 0 even if that falls within a reserved region. Thus I propose the below patch to make vfio_test_domain_fgsp() find a region to do its mapping test instead of blindly using IOVA 0. I did post the below patch independently already on December 22 but the subject wording didn't make it clear that this fixes a real problem and of course the holidays contribute to making things easier to miss so I wanted to post again with a bit more background and a more catchy/clear subject on the cover letter. As for testing, I tested this based on current master on both on s390 where it skips the reserved 0x0-0x100000000 range and on an AMD Ryzen 3990X where it continues to do the test on DMA address 0 and sets domain->fgsp to true. Thanks, Niklas Schnelle Niklas Schnelle (1): vfio/type1: Respect IOMMU reserved regions in vfio_test_domain_fgsp() drivers/vfio/vfio_iommu_type1.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-)