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Fri, 31 Jul 2026 13:09:02 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 31 Jul 2026 13:09:02 +0000 (GMT) From: Steffen Eiden To: kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Alexander Gordeev , Andreas Grapentin , Arnd Bergmann , Catalin Marinas , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Friedrich Welter , Fuad Tabba , Gautam Gala , Hariharan Mari , Heiko Carstens , Hendrik Brueckner , Ilya Leoshkevich , Janosch Frank , Joey Gouly , Marc Zyngier , Nico Boehr , Nina Schoetterl-Glausch , Oliver Upton , Paolo Bonzini , Suzuki K Poulose , Sven Schnelle , Ulrich Weigand , Vasily Gorbik , Will Deacon , Zenghui Yu Subject: [PATCH v5 00/31] KVM: s390: Introduce arm64 KVM Date: Fri, 31 Jul 2026 15:08:28 +0200 Message-ID: <20260731130902.654679-1-seiden@linux.ibm.com> X-Mailer: git-send-email 2.53.0 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-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: qUtT0oBvyHlQCbu7L-CIXDvzn_S8vDKZ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMxMDA5NiBTYWx0ZWRfX1Ryc8pD5ZTZl 0IgMSjd60M/ah+qtwMNEAyL9shDsy8kXDUfrtTuBeD6nlX4d4PAEDlYa4F09pqFtPMSNri4TQsx qH8QrHlJ+OPGlR9w8USS63v1zk+RobTNuX3SaX5dIy/sE+lWb1trdmm9BtfwKu19BcDIWNanV6q G/OLWdEG4t4qaGGYe7qkZ56cGf0Chz7VOV/AD6lFzCf9FH1Fq0Na4emX36oUH9ovks5Kqq03Rwi 6LxvKZeDGIRpHCjag1Boxf/txoO02bN06IOdhWwdXqbruUDbO/p82rR/O5LA4gzcUT08nwc3Q2n 6nOPVg4T+tiudmnPolS/atUVXx8UmGTiJhQEFIQ5pvUxTunNoU7QLy2FyOYEVmcZ2tYhujDdJgo nhvXzvlwh6mT1MRsyiQ8p4xT4lvSc5jS27mbUs8FDK3TvxFuK2lIGuFUi9IsNE7XnwZSx/6q0Iy xamXw6tdAH8GeYwMrfw== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMxMDA5NiBTYWx0ZWRfX2Y/KCjH5zLJN GqwzB58WRQ1kDBXAOM9FBlwTVPu+vNIuA9hrXfpFEBB10wUZQzNaJ9FPKTFs+EIob/BonG9I8NG BUu1eUNGDEouBLgHhd1xau59JRt5umY= X-Authority-Analysis: v=2.4 cv=AZeB2XXG c=1 sm=1 tr=0 ts=6a6c9e78 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=_84NmouirAEMwovvlUcA:9 a=Zr1Jdahoogi_HG0H:21 a=O8hF6Hzn-FEA:10 X-Proofpoint-GUID: qjfJcKI5Nod9OsE77-UClyD4bfN7NpZR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-31_04,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 phishscore=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 suspectscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607310096 Introduce arm-on-s390. Enable KVM-accelerated ARM CPU virtualisation on s390. For the original, now partially outdated, cover letter, have a look at versions one to three [1]. To share arm64 code with arm-on-s390 KVM, s390 extracts relevant parts of arm64 definitions and implementation and uses them locally. This results in minimal changes to existing arm64 code and headers. To enable s390 to selectively extract relevant definitions while skipping architecture-specific code (e.g., arm64 assembly), a shared marker is introduced. The ARM64_S390_COMMON macro marks regions of arm64 code that are shared with s390: in arch/arm64/kvm/.c #ifdef ARM64_S390_COMMON #endif /* ARM64_S390_COMMON */ ARM64_S390_COMMON is defined for all arm64 compilation units. During the s390 build, an allow-list of arm64 headers is extracted into arch/s390/include/generated/arm64/. If a header contains at least one shared region, only those regions are copied along with the include guard. If no shared region is found, s390 uses the full header, which is copied in its entirety. In such cases, a comment is added at the top of the header to notify arm64 developers that the file is shared with s390 and changes may impact s390. For C files, the process is similar. Selected KVM/arm64 C files are partially extracted into arch/s390/kvm/arm64/generated/code.inc. The s390 arm64 KVM implementation includes these snippets to reuse arm64 code without changing linkage. Userspace tools requiring KVM/arm64 uapi on s390 must use a vendored KVM API, as s390 will not ship nor install arm64 KVM uapi headers. This approach reduces the churn, especially for arm64 while keeping the maintenance burden low. Series structure A) KVM symbol cleanup and refactoring (patches 1-3): Prepare KVM to support two KVM modules in parallel. Clean up KVM module symbol exports, making it possible to load two KVM modules side by side. Make the KVM device name configurable and remove KVM_MMIO as a config option. B) Arm64 header and code sharing preparation (patches 4-12): Mark shareable parts with ARM64_S390_COMMON. Perform minor refactoring to ease integration into s390. C) KVM/s390 reorganization (patches 13-20): Prepare s390 for a second KVM module. Move existing s390 KVM code into dedicated s390 and gmap subdirectories to make room for a second KVM implementation. Refactor gmap to better integrate with the second KVM implementation. D) Code sharing infrastructure for s390 (patches 21 & 22): Add Makefile and scripts to extract and build arm64 headers and code for use by s390. E) KVM on s390 (patches 23-32): Introduce the SAE (Start Arm Execution) instruction as the s390 mechanism for running arm64 guests. Build up the new kvm-arm64 module incrementally. I hope that this new approach suits arm64 better. I definitely think this way of doing things is more elegant, has less churn, and less work for us all. A, B, C and D could be picked without the others so they could go through different trees if required. E requires A-D to be picked before. Some comments: I want to create a verification tool for you arm guys that mimics the s390 use of the arm64 code and headers but compiles/works on arm64 as a quick sanity check for any arm64 developer. I have some general ideas (A C-file including all the arm code & headers and see if it compiles) about how to do this but no concrete ideas yet. Pointers/Ideas are highly appreciated To further harden the extraction of code/headers one could do the following: 1. Expand all the macros on the header/code a) with -DARM64_S390_COMMON b) without -DARM64_S390_COMMON 2. The diff of a & b should be the stuff s390 needs 3. Postprocess it a bit (guards and copyight) But the AWK approach looked more straight forward and simpler. I think that there is no way around it: In the future arm64 maintainers should at least build s390 before sending merge request. Steffen Changes from v4 [2]: - do not remove CONFIG_KVM_MMIO but let KVM/s390 opt out of MMIO - use kstrdup_const for copying the kvm-device name - use file based vfio tracking instead of inlining struct kvm refcounting arm64: - reorganized arm64 code share & refactoring - first refactoring then sharing - add arm64 refactoring to reduce shared regions - shared a bit more function (definitions) to reduce no of shared regions (which would be shared in later series anyways) - add patch to generate SPSR sysreg definitions - add patch which defines an enum for the arm32 compat registers s390: - fix arm64 header generation wiring - awk scripts are more robust and error out if an end marker is missing - postfix combined headers with -gen instead of -part - removed pre-fault-memory implementation - implemented system supported feature sanitisation - removed some unnecessary functions - moved prefix, cmma, and storage key code from gmap to kvm/s390 - properly reset vxregs Changes from v3 - Complete rework of the code sharing approach - Introduced ARM64_S390_COMMON marker for selective extraction - Build-time extraction instead of development-time sharing - Minimal impact on arm64 codebase - Improved gmap refactoring and integration [1] Previous versions: v1 https://lore.kernel.org/all/20260402042125.3948963-1-seiden@linux.ibm.com/ v2 https://lore.kernel.org/all/20260428155622.1361364-1-seiden@linux.ibm.com/ v3 https://lore.kernel.org/all/20260529155050.2902245-1-seiden@linux.ibm.com/ [2] https://lore.kernel.org/all/20260706085229.979525-1-seiden@linux.ibm.com/ Hendrik Brueckner (1): s390/hwcaps: Report SAE support as hwcap Steffen Eiden (30): vfio: Use file-based reference counting for KVM KVM: Make device name configurable KVM: Allow KVM implementations to switch off MMIO independent of Kconfig arm64: Use proper include variant arm64: ptrace: Use constants for compat register numbers arm64/sysreg: Convert SPSR_ELx to automatic register generation KVM: arm64: Access elements of vcpu_gp_regs individually KVM: arm64: Use accessor functions for gprs during reset KVM: arm64: Refactor core-reset into a separate function arm64: Prepare sharing arm64 headers with s390 arm64: Share arm64 headers with s390 KVM: arm64: Share arm64 code with s390 KVM: s390: Prepare moving KVM/s390 to arch/s390/kvm/s390 KVM: s390: Move s390 kvm code into a subdirectory KVM: s390: Guard KVM/s390 behind CONFIG_KVM_S390 KVM: s390: Move PGM code definitions to asm/kvm_host.h KVM: s390: Prepare gmap for a second KVM implementation KVM: s390: gmap: Move storage key and CMMA code to kvm/s390 KVM: s390: gmap: Move prefix handling to kvm/s390 KVM: s390: Prepare KVM/s390 for a second KVM module s390: Use arm64 headers KVM: s390: Use arm64 code s390: Introduce Start Arm Execution instruction KVM: s390: arm64: Introduce host definitions KVM: s390: Add basic arm64 kvm module KVM: s390: arm64: Implement required functions KVM: s390: arm64: Implement vm/vcpu create destroy. KVM: s390: arm64: Implement vCPU IOCTLs KVM: s390: arm64: Implement basic page fault handler KVM: s390: arm64: Enable KVM_ARM64 config and Kbuild MAINTAINERS | 2 +- arch/arm64/Makefile | 2 + arch/arm64/include/asm/brk-imm.h | 1 + arch/arm64/include/asm/esr.h | 5 +- arch/arm64/include/asm/kvm_arm.h | 6 +- arch/arm64/include/asm/kvm_emulate.h | 33 +- arch/arm64/include/asm/kvm_host.h | 87 +- arch/arm64/include/asm/ptrace.h | 64 +- arch/arm64/include/asm/sysreg.h | 22 +- arch/arm64/kvm/arm.c | 3 + arch/arm64/kvm/guest.c | 22 +- arch/arm64/kvm/handle_exit.c | 6 + arch/arm64/kvm/hyp/exception.c | 4 +- arch/arm64/kvm/hyp/include/hyp/adjust_pc.h | 4 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 4 +- arch/arm64/kvm/mmio.c | 2 + arch/arm64/kvm/reset.c | 46 +- arch/arm64/tools/sysreg | 72 ++ arch/s390/Kconfig | 2 +- arch/s390/boot/ipl_parm.c | 2 +- arch/s390/boot/uv.c | 2 +- arch/s390/configs/debug_defconfig | 2 +- arch/s390/configs/defconfig | 3 +- arch/s390/include/arm64/kvm_emulate.h | 102 +++ arch/s390/include/arm64/kvm_nested.h | 11 + arch/s390/include/arm64/ptrace.h | 11 + arch/s390/include/arm64/sysreg.h | 13 + arch/s390/include/asm/Kbuild | 3 + arch/s390/include/asm/asm-prototypes.h | 1 + arch/s390/include/asm/elf.h | 2 + arch/s390/include/asm/kvm.h | 6 + arch/s390/include/asm/kvm_host.h | 729 +---------------- arch/s390/include/asm/kvm_host_arm64.h | 224 ++++++ arch/s390/include/asm/kvm_host_arm64_types.h | 118 +++ .../asm/{kvm_host.h => kvm_host_s390.h} | 66 +- ...kvm_host_types.h => kvm_host_s390_types.h} | 6 +- arch/s390/include/asm/kvm_host_types.h | 351 +-------- arch/s390/include/asm/sae.h | 56 ++ arch/s390/include/asm/sclp.h | 5 +- arch/s390/include/asm/stacktrace.h | 5 + arch/s390/kernel/asm-offsets.c | 1 + arch/s390/kernel/early.c | 2 +- arch/s390/kernel/entry.S | 32 +- arch/s390/kernel/perf_event.c | 2 +- arch/s390/kernel/processor.c | 3 + arch/s390/kvm/Kconfig | 37 +- arch/s390/kvm/Makefile | 12 +- arch/s390/kvm/arm64/.gitignore | 2 + arch/s390/kvm/arm64/Kconfig | 22 + arch/s390/kvm/arm64/Makefile | 91 +++ arch/s390/kvm/arm64/Makefile.gen | 30 + arch/s390/kvm/arm64/arm.c | 744 ++++++++++++++++++ arch/s390/kvm/arm64/arm.h | 58 ++ arch/s390/kvm/arm64/copy-arm64c.awk | 70 ++ arch/s390/kvm/arm64/guest.c | 135 ++++ arch/s390/kvm/arm64/handle_exit.c | 131 +++ arch/s390/kvm/arm64/handle_exit.h | 9 + arch/s390/kvm/arm64/inject_fault.c | 21 + arch/s390/kvm/arm64/mmio.c | 15 + arch/s390/kvm/arm64/mmu.c | 177 +++++ arch/s390/kvm/arm64/reset.c | 77 ++ arch/s390/kvm/arm64/reset.h | 11 + arch/s390/kvm/arm64/trace.h | 67 ++ arch/s390/kvm/gmap/Makefile | 5 + arch/s390/kvm/{ => gmap}/dat.c | 548 ------------- arch/s390/kvm/{ => gmap}/dat.h | 14 +- arch/s390/kvm/{ => gmap}/faultin.c | 8 +- arch/s390/kvm/{ => gmap}/faultin.h | 6 +- arch/s390/kvm/{ => gmap}/gmap.c | 111 +-- arch/s390/kvm/{ => gmap}/gmap.h | 29 +- arch/s390/kvm/gmap/kvm_mmu.c | 135 ++++ arch/s390/kvm/gmap/kvm_mmu.h | 18 + arch/s390/kvm/gmap/prefix.h | 39 + arch/s390/kvm/gmap/trace-gmap.h | 59 ++ arch/s390/kvm/{ => s390}/Kconfig | 27 +- arch/s390/kvm/s390/Makefile | 15 + arch/s390/kvm/s390/dat.c | 554 +++++++++++++ arch/s390/kvm/{ => s390}/diag.c | 2 +- arch/s390/kvm/{ => s390}/gaccess.c | 2 +- arch/s390/kvm/{ => s390}/gaccess.h | 2 +- arch/s390/kvm/s390/gmap.c | 113 +++ arch/s390/kvm/{ => s390}/guestdbg.c | 2 +- arch/s390/kvm/{ => s390}/intercept.c | 2 +- arch/s390/kvm/{ => s390}/interrupt.c | 2 +- arch/s390/kvm/{ => s390}/pci.c | 2 +- arch/s390/kvm/{ => s390}/pci.h | 0 arch/s390/kvm/{ => s390}/priv.c | 2 +- arch/s390/kvm/{ => s390}/pv.c | 2 +- arch/s390/kvm/{kvm-s390.c => s390/s390.c} | 121 +-- arch/s390/kvm/{kvm-s390.h => s390/s390.h} | 36 +- arch/s390/kvm/{ => s390}/sigp.c | 2 +- arch/s390/kvm/{ => s390}/trace-s390.h | 0 arch/s390/kvm/{ => s390}/trace.h | 14 - arch/s390/kvm/{ => s390}/vsie.c | 2 +- arch/s390/tools/Makefile | 10 +- arch/s390/tools/Makefile.arm64h | 57 ++ arch/s390/tools/copy-arm64h-full.awk | 47 ++ arch/s390/tools/copy-arm64h.awk | 72 ++ arch/s390/tools/opcodes.txt | 3 + arch/x86/include/asm/kvm_page_track.h | 8 +- arch/x86/kvm/Makefile | 3 - arch/x86/kvm/mmu/page_track.c | 16 +- drivers/s390/char/sclp_early.c | 1 + drivers/s390/crypto/vfio_ap_ops.c | 24 +- drivers/vfio/group.c | 2 +- drivers/vfio/pci/vfio_pci_zdev.c | 7 +- drivers/vfio/vfio.h | 10 +- drivers/vfio/vfio_main.c | 49 +- include/linux/kvm_host.h | 8 +- include/linux/vfio.h | 4 +- virt/kvm/coalesced_mmio.c | 4 + virt/kvm/coalesced_mmio.h | 2 +- virt/kvm/kvm_main.c | 69 +- virt/kvm/vfio.c | 8 +- 114 files changed, 3917 insertions(+), 2215 deletions(-) create mode 100644 arch/s390/include/arm64/kvm_emulate.h create mode 100644 arch/s390/include/arm64/kvm_nested.h create mode 100644 arch/s390/include/arm64/ptrace.h create mode 100644 arch/s390/include/arm64/sysreg.h create mode 100644 arch/s390/include/asm/kvm.h create mode 100644 arch/s390/include/asm/kvm_host_arm64.h create mode 100644 arch/s390/include/asm/kvm_host_arm64_types.h copy arch/s390/include/asm/{kvm_host.h => kvm_host_s390.h} (90%) copy arch/s390/include/asm/{kvm_host_types.h => kvm_host_s390_types.h} (98%) create mode 100644 arch/s390/include/asm/sae.h create mode 100644 arch/s390/kvm/arm64/.gitignore create mode 100644 arch/s390/kvm/arm64/Kconfig create mode 100644 arch/s390/kvm/arm64/Makefile create mode 100644 arch/s390/kvm/arm64/Makefile.gen create mode 100644 arch/s390/kvm/arm64/arm.c create mode 100644 arch/s390/kvm/arm64/arm.h create mode 100644 arch/s390/kvm/arm64/copy-arm64c.awk create mode 100644 arch/s390/kvm/arm64/guest.c create mode 100644 arch/s390/kvm/arm64/handle_exit.c create mode 100644 arch/s390/kvm/arm64/handle_exit.h create mode 100644 arch/s390/kvm/arm64/inject_fault.c create mode 100644 arch/s390/kvm/arm64/mmio.c create mode 100644 arch/s390/kvm/arm64/mmu.c create mode 100644 arch/s390/kvm/arm64/reset.c create mode 100644 arch/s390/kvm/arm64/reset.h create mode 100644 arch/s390/kvm/arm64/trace.h create mode 100644 arch/s390/kvm/gmap/Makefile rename arch/s390/kvm/{ => gmap}/dat.c (61%) rename arch/s390/kvm/{ => gmap}/dat.h (97%) rename arch/s390/kvm/{ => gmap}/faultin.c (96%) rename arch/s390/kvm/{ => gmap}/faultin.h (96%) rename arch/s390/kvm/{ => gmap}/gmap.c (93%) rename arch/s390/kvm/{ => gmap}/gmap.h (94%) create mode 100644 arch/s390/kvm/gmap/kvm_mmu.c create mode 100644 arch/s390/kvm/gmap/kvm_mmu.h create mode 100644 arch/s390/kvm/gmap/prefix.h create mode 100644 arch/s390/kvm/gmap/trace-gmap.h copy arch/s390/kvm/{ => s390}/Kconfig (61%) create mode 100644 arch/s390/kvm/s390/Makefile create mode 100644 arch/s390/kvm/s390/dat.c rename arch/s390/kvm/{ => s390}/diag.c (99%) rename arch/s390/kvm/{ => s390}/gaccess.c (99%) rename arch/s390/kvm/{ => s390}/gaccess.h (99%) create mode 100644 arch/s390/kvm/s390/gmap.c rename arch/s390/kvm/{ => s390}/guestdbg.c (99%) rename arch/s390/kvm/{ => s390}/intercept.c (99%) rename arch/s390/kvm/{ => s390}/interrupt.c (99%) rename arch/s390/kvm/{ => s390}/pci.c (99%) rename arch/s390/kvm/{ => s390}/pci.h (100%) rename arch/s390/kvm/{ => s390}/priv.c (99%) rename arch/s390/kvm/{ => s390}/pv.c (99%) rename arch/s390/kvm/{kvm-s390.c => s390/s390.c} (98%) rename arch/s390/kvm/{kvm-s390.h => s390/s390.h} (94%) rename arch/s390/kvm/{ => s390}/sigp.c (99%) rename arch/s390/kvm/{ => s390}/trace-s390.h (100%) rename arch/s390/kvm/{ => s390}/trace.h (97%) rename arch/s390/kvm/{ => s390}/vsie.c (99%) create mode 100644 arch/s390/tools/Makefile.arm64h create mode 100644 arch/s390/tools/copy-arm64h-full.awk create mode 100644 arch/s390/tools/copy-arm64h.awk base-commit: 8ba098e6b6ff0db8edf28528d1552be261af30d4 -- 2.53.0