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Fri, 7 Feb 2025 20:53:35 +0000 (GMT) From: Matthew Rosato To: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com Cc: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, clegoate@redhat.com, jgg@nvidia.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v4 0/4] iommu/s390: add support for IOMMU passthrough Date: Fri, 7 Feb 2025 15:53:31 -0500 Message-ID: <20250207205335.473946-1-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: lJAzURkSLHDBwagGGbtFvD0Sxd48ofPT X-Proofpoint-GUID: lJAzURkSLHDBwagGGbtFvD0Sxd48ofPT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-07_09,2025-02-07_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=651 priorityscore=1501 impostorscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 spamscore=0 malwarescore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502070153 This series introduces the ability for certain devices on s390 to bypass a layer of IOMMU via the iommu.passthrough=1 option. In order to enable this, the concept of an identity domain is added to s390-iommu. On s390, IOMMU passthrough is only allowed if indicated via a special bit in s390 CLP data for the associated device group, otherwise we must fall back to dma-iommu. Changes for v4: - Additional patch to handle IOAT registration within s390-iommu. This fixes an issue with re-registration of identity domain during events like zpci_hot_reset_device - Fixup page alignment for bus_dma_region setup - Dropped a few review/test tags due to above changes Changes for v3: - Rebase onto 6.13 - fixed bus_dma_region size (Niklas) Changes for v2: - Remove ARCH_HAS_PHYS_TO_DMA, use bus_dma_region - Remove use of def_domain_type, use 1 of 2 ops chosen at init Matthew Rosato (4): s390/pci: check for relaxed translation capability s390/pci: store DMA offset in bus_dma_region iommu/s390: handle IOAT registration based on domain iommu/s390: implement iommu passthrough via identity domain arch/s390/include/asm/pci.h | 4 +- arch/s390/include/asm/pci_clp.h | 4 +- arch/s390/kvm/pci.c | 17 +--- arch/s390/pci/pci.c | 35 ++++---- arch/s390/pci/pci_bus.c | 18 +++++ arch/s390/pci/pci_clp.c | 1 + arch/s390/pci/pci_sysfs.c | 11 +-- drivers/iommu/s390-iommu.c | 138 ++++++++++++++++++++++++++------ 8 files changed, 161 insertions(+), 67 deletions(-) -- 2.48.1