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Mon, 23 Mar 2026 09:32:53 +0000 (GMT) From: Julian Ruess Subject: [PATCH v7 0/3] vfio/pci: Introduce vfio_pci driver for ISM devices Date: Mon, 23 Mar 2026 10:32:44 +0100 Message-Id: <20260323-vfio_pci_ism-v7-0-abf537150408@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIALwIwWkC/32Sy07DMBAAfwXlTCrv2t6NOfEfCFV+Uku0qRKIi qr+O04uhOByXEsz49e1GeOQ49g8PVybIU55zP2pDPz40PiDPb3FNocyNyhQC0Rup5T7/dnnfR6 PrfDeY1SMqLgpyHmIKV8W3ctrmQ95/OiHr8U+4bw6i0gA6N+iCVvRerIykSYdQD6/59PnZZfdc ef74+xewBKqgEmAMEpLlsluwHkXk1yXzUYgiwB8AAg2ChbhTlkKXQMRWDD5DoKpldWqjHIjUPO ZXZckWzTountlqIGKSZcNa0oMtbJel7dn1kXAiQxbqZyycLfMFdCxRNU5FTVTrUw/ZRS0EVARh GBYKmEosrlbNhXQk7OOWDsvqu/M/5V5vjRynQrJkoFYE3QrAcBG0BWB1kpYbxx2fz7KIoC1ADc CKAIpJRLaUL6a2gput9s3HfZzGZADAAA= X-Change-ID: 20250227-vfio_pci_ism-0ccc2e472247 To: schnelle@linux.ibm.com, wintera@linux.ibm.com, ts@linux.ibm.com, oberpar@linux.ibm.com, gbayer@linux.ibm.com, Alex Williamson , Jason Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian Cc: mjrosato@linux.ibm.com, alifm@linux.ibm.com, raspl@linux.ibm.com, hca@linux.ibm.com, agordeev@linux.ibm.com, gor@linux.ibm.com, julianr@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-pci@vger.kernel.org X-Mailer: b4 0.14.2 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 33k3iQj0GtDMcefr0mEeXYl9W6wd8kiz X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzIzMDA3MSBTYWx0ZWRfXzS8iAqOj67AZ CphsDX06CH/OKXjhL71Km6r0b/8RVOP9ycMW2cwabdirS2Jg6fx5qtSOSnevNd8Ps6gc5RV6JOR CT/VF/CdIZDFIEMHQ1s/gP9ZOgS3Bh3Ljlpi/qGhCVouL7vDIefrcY9yr5jlvrt677OFCFPBVX9 NXcIQP2ea0+M0BA0cnDTKMOHXXBoGO0b/5AVTopTrZopZ2WGwTG16z16WZZPSdfTmNKmTJGtgn8 PEGBXxbSaWePVbWi/6/XzElnIxUHDx8XvQdTYhozXm7V0euTr+pm4pEObXNr21yhBHn8FC70vAI 5sza8HlPYAzAQuwvqmxtQdu1gDum0fuMQ14ZV3Ecbd3qgqQXwpYhDv2G+ldPxmVJkHBJDeF2DGp nl11C2nu8Db7QNaX9ZwIAyQtSST2UUsye1yw8UdtgIsmWfHtOmAqb+Bm/EMk7/JJpvc9tYjyseI dWMijwPYxwitf0nfElQ== X-Authority-Analysis: v=2.4 cv=bLEb4f+Z c=1 sm=1 tr=0 ts=69c108cb cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=S08g_WpIHce721ZfF44A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: 33k3iQj0GtDMcefr0mEeXYl9W6wd8kiz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-23_02,2026-03-20_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 clxscore=1015 phishscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603230071 Hi all, This series adds a vfio_pci variant driver for the s390-specific Internal Shared Memory (ISM) devices used for inter-VM communication including SMC-D. This is a prerequisite for an in-development open-source user space driver stack that will allow to use ISM devices to provide remote console and block device functionality. This stack will be part of s390-tools. This driver would also allow QEMU to mediate access to an ISM device, enabling a form of PCI pass-through even for guests whose hardware cannot directly execute PCI accesses, such as nested guests. On s390, kernel primitives such as ioread() and iowrite() are switched over from function handle based PCI load/stores instructions to PCI memory-I/O (MIO) loads/stores when these are available and not explicitly disabled. Since these instructions cannot be used with ISM devices, ensure that classic function handle-based PCI instructions are used instead. The driver is still required even when MIO instructions are disabled, as the ISM device relies on the PCI store‑block (PCISTB) instruction to perform write operations. Thank you, Julian Signed-off-by: Julian Ruess --- Changes in v7: - Add 4k alignment and to kmem_cache_create() to do not cross the integral boundary. - Add SLAB_RECLAIM_ACCOUNT ans SLAB_ACCOUNT to kmem_cache_create() for memcg accounting. - Link to v6: https://lore.kernel.org/r/20260319-vfio_pci_ism-v6-0-c6bab675bc0a@linux.ibm.com Changes in v6: - Introduce ism_vfio_pci_init_dev() and ism_vfio_pci_release_dev(). - Add early return for __zpci_load(). - Use kmem_cache_alloc() instead of kmem_cache_zalloc(). - Rename ivdev to ivpcd for consistency. - Rename ism_pci_open_device() to ism_vfio_pci_open_device(). - Link to v5: https://lore.kernel.org/r/20260317-vfio_pci_ism-v5-0-b73248b4e576@linux.ibm.com Changes in v5: - Support reads < 8 bytes. - Link to v4: https://lore.kernel.org/r/20260313-vfio_pci_ism-v4-0-4765ae056f71@linux.ibm.com Changes in v4: - Fix bug with < 8 byte reads. For code simplicity, only support 8 byte reads. - Fix leak of ivpcd. - Fix cache replacement by implementing a per-device kmem_cache. - Link to v3: https://lore.kernel.org/r/20260305-vfio_pci_ism-v3-0-1217076c81d9@linux.ibm.com Changes in v3: - Add comments to ism_vfio_pci_do_io_r() and ism_vfio_pci_do_io_w(). - Format Kconfig. - Add 4k boundary check to ism_vfio_pci_do_io_w(). - Use kmem_cache instead of kzalloc in ism_vfio_pci_do_io_w(). - Add error handler to struct ism_vfio_pci_driver. - Link to v2: https://lore.kernel.org/r/20260224-vfio_pci_ism-v2-0-f010945373fa@linux.ibm.com Changes in v2: - Remove common code patch that sets VFIO_PCI_OFFSET_SHIFT to 48. - Implement ism_vfio_pci_ioctl_get_region_info() to have own region offsets. - For config space accesses, rename vfio_config_do_rw() to vfio_pci_config_rw_single() and export it. - Use zdev->maxstbl instead of ZPCI_BOUNDARY_SIZE. - Add comment that zPCI must not use MIO instructions for config space access. - Rework patch descriptions. - Update license info. - Link to v1: https://lore.kernel.org/r/20260212-vfio_pci_ism-v1-0-333262ade074@linux.ibm.com --- Julian Ruess (3): vfio/pci: Rename vfio_config_do_rw() to vfio_pci_config_rw_single() and export it vfio/ism: Implement vfio_pci driver for ISM devices MAINTAINERS: add VFIO ISM PCI DRIVER section MAINTAINERS | 6 + drivers/vfio/pci/Kconfig | 2 + drivers/vfio/pci/Makefile | 2 + drivers/vfio/pci/ism/Kconfig | 10 + drivers/vfio/pci/ism/Makefile | 3 + drivers/vfio/pci/ism/main.c | 401 +++++++++++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci_config.c | 8 +- drivers/vfio/pci/vfio_pci_priv.h | 4 + 8 files changed, 433 insertions(+), 3 deletions(-) --- base-commit: c369299895a591d96745d6492d4888259b004a9e change-id: 20250227-vfio_pci_ism-0ccc2e472247 Best regards, -- Julian Ruess