s390 architecture · Supported

Maintainers

• M Heiko Carstens <hca@linux.ibm.com>
• M Vasily Gorbik <gor@linux.ibm.com>
• M Alexander Gordeev <agordeev@linux.ibm.com>
• R Christian Borntraeger <borntraeger@linux.ibm.com>
• R Sven Schnelle <svens@linux.ibm.com>

Paths

• F Documentation/driver-api/s390-drivers.rst
• F Documentation/arch/s390/
• F arch/s390/
• F drivers/s390/
• F drivers/watchdog/diag288_wdt.c

Last 30 days

Most active threads (last 7 days)

• HOTtoday [PATCH v7 00/22] dma-mapping: Track shared DMA state through direct, pool and swiotlb paths
  2026-07-01 05:52 · 3 replies in 7d · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• HOTtoday [PATCH v5 0/8] futex: Use runtime constants for futex_hash computation
  2026-06-30 04:57 · 1 reply in 7d · K Prateek Nayak <kprateek.nayak@amd.com>
• HOTtoday [PATCH v4 0/2] tracing: Move non-trace_printk prototypes into trace_controls.h
  2026-06-25 10:43 · 1 reply in 7d · Steven Rostedt <rostedt@kernel.org>

Active reviewers (last 30 days)

• Jiri Pirko <hidden>
  2 attestations (2 Tested-by) · last on 2026-07-01
• Michael Kelley <hidden>
  2 attestations (2 Tested-by) · last on 2026-07-01
• Mostafa Saleh <smostafa@google.com>
  2 attestations (2 Tested-by) · last on 2026-07-01
• Jaehoon Kim <hidden>
  1 attestation (1 Tested-by) · last on 2026-07-01
• Heiko Carstens <hca@linux.ibm.com>
  1 attestation (1 Acked-by) · last on 2026-06-30
• Yury Norov <yury.norov@gmail.com>
  1 attestation (1 Suggested-by) · last on 2026-06-25
• Masami Hiramatsu (Google) <mhiramat@kernel.org>
  1 attestation (1 Acked-by) · last on 2026-06-25

Recent patches

Most-recent 30 patches in this subsystem on linux-arm-kernel (capped at 30), ordered by date desc.

• HOTtoday REVIEWED: 3 (1M) [PATCH v7 16/22] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
  2026-07-01 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• HOTtoday [PATCH v7 08/22] coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT
  2026-07-01 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• HOTtoday REVIEWED: 1 (0M) [PATCH v7 06/22] s390: Expose protected virtualization through cc_platform_has()
  2026-07-01 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• HOTtoday REVIEWED: 2 (2M) [PATCH v5 6/8] s390/runtime-const: Introduce runtime_const_mask_32()
  2026-06-30 · K Prateek Nayak <kprateek.nayak@amd.com>
• HOTtoday REVIEWED: 9 (9M) [PATCH v4 1/2] tracing: Move non-trace_printk prototypes into trace_controls.h
  2026-06-25 · Steven Rostedt <rostedt@kernel.org>
• HOTtoday REVIEWED: 3 (1M) [PATCH v6 09/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
  2026-06-04 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• HOTtoday [PATCH v6 01/20] s390: Expose protected virtualization through cc_platform_has()
  2026-06-04 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COLD21d [PATCH v1 23/26] KVM: s390: arm64: Implement feature sanitisation
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 14/26] s390: Introduce Query Available Arm features
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 24/26] KVM: s390: arm64: Implement sysreg handling
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 15/26] s390: Add functions to query arm guest time
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 25/26] KVM: s390: arm64: Implement exception injection
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 25/27] KVM: s390: arm64: Implement vCPU IOCTLs
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 16/26] KVM: s390: arm64: Add sysreg related functions and definitions
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 26/26] KVM: s390: arm64: Finalize page fault handling
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD21d [PATCH v1 13/26] s390: Introduce read/write ARM sysreg instructions
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 18/27] KVM: s390: Prepare kvm-s390 for a second kvm module
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 14/27] KVM: s390: Move s390 kvm code into a subdirectory
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 04/27] uapi: KVM: Provide arm64 UAPI for other host architectures
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 15/27] KVM: S390: Refactor gmap
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 26/27] KVM: s390: arm64: Implement basic page fault handler
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 20/27] KVM: s390: arm64: Introduce host definitions
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 19/27] s390: Introduce Start Arm Execution instruction
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 22/27] KVM: s390: Add basic arm64 kvm module
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 23/27] KVM: s390: arm64: Implement required functions
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 21/27] s390/hwcaps: Report SAE support as hwcap
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 27/27] KVM: s390: arm64: Enable KVM_ARM64 config and Kbuild
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD32d [PATCH v3 24/27] KVM: s390: arm64: Implement vm/vcpu create destroy.
  2026-05-29 · Steffen Eiden <seiden@linux.ibm.com>
• COLD23d REVIEWED: 1 (0M) [PATCH v5 10/20] dma-direct: make dma_direct_map_phys() honor DMA_ATTR_CC_SHARED
  2026-05-22 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
• COLD23d [PATCH v5 02/20] [DO NOT MERGE] s390: Expose protected virtualization through cc_platform_has()
  2026-05-22 · "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• STALE125d REVIEWED: 2 (2M) [PATCH 4/4] s390: Enable page table check for debug_defconfig
  2026-02-23 · Alexander Gordeev <agordeev@linux.ibm.com> · 1 Reviewed-by
• STALE125d REVIEWED: 2 (2M) [PATCH 3/4] s390/pgtable: Add s390 support for page table check
  2026-02-23 · Alexander Gordeev <agordeev@linux.ibm.com> · 1 Reviewed-by
• STALE100d REVIEWED: 1 (0M) [PATCH bpf-next v9 2/5] bpf: Pass bpf_verifier_env to JIT
  2026-03-12 · Xu Kuohai <xukuohai@huaweicloud.com> · 1 Reviewed-by
• STALE100d REVIEWED: 1 (0M) [PATCH bpf-next v9 1/5] bpf: Move constants blinding out of arch-specific JITs
  2026-03-12 · Xu Kuohai <xukuohai@huaweicloud.com> · 1 Reviewed-by
• STALE83d REVIEWED: 1 (0M) [PATCH bpf-next v12 2/5] bpf: Pass bpf_verifier_env to JIT
  2026-04-03 · Xu Kuohai <xukuohai@huaweicloud.com> · 1 Reviewed-by

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE168d [PATCH 08/36] crypto: aes - Remove aes-fixed-time / CONFIG_CRYPTO_AES_TI
  2026-01-05 · Eric Biggers <ebiggers@kernel.org>
• STALE120d [PATCH 07/12] mm: add rest_of_page() macro
  2026-02-19 · Yury Norov <hidden>
• STALE118d [PATCH bpf-next v5 2/5] bpf: Pass bpf_verifier_env to jit
  2026-03-02 · Xu Kuohai <xukuohai@huaweicloud.com>
• STALE104d [PATCH 09/15] s390: Remove AT_VECTOR_SIZE_ARCH from UAPI
  2026-03-02 · Thomas Weißschuh <hidden>
• STALE114d [bpf-next v7 2/5] bpf: Pass bpf_verifier_env to JIT
  2026-03-07 · Xu Kuohai <xukuohai@huaweicloud.com>
• STALE100d LANDED [PATCH 13/19] lib/crypto: s390/ghash: Migrate optimized code into library
  2026-03-19 · Eric Biggers <ebiggers@kernel.org>
• STALE99d LANDED [PATCH 03/12] crypto: sm3 - Rename CRYPTO_SM3_GENERIC to CRYPTO_SM3
  2026-03-21 · Eric Biggers <ebiggers@kernel.org>
• STALE96d [PATCH 02/10] resource: Pass full extent of empty space to resource_alignf CB
  2026-03-24 · Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
• STALE69d [PATCH v1 22/27] KVM: s390: Add basic arm64 kvm module
  2026-04-02 · Steffen Eiden <seiden@linux.ibm.com>
• STALE69d [PATCH v1 21/27] s390/hwcaps: Report SAE support as hwcap
  2026-04-02 · Steffen Eiden <seiden@linux.ibm.com>