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[PATCH OLK-6.6 v9 0/9] Add xcall 2.0 support
by Jinjie Ruan 14 Nov '25

14 Nov '25

Add xcall 2.0 support, which is compatible with xcall1.0, and can be used to dynamic instruction replacement for hardware xcall. Chanegs in v9: - /proc/xcall/comm, 0644 -> 0640 - /proc/xcall/comm check proc_mkdir("xcall", NULL) return value, use it as the parent proc_dir_entry for "comm". - Consider next task is NULL for xcall_info_switch(). - Return -EINVAL for error path in parse_xcall_command(). Changes in v8: - Fix no reigister and unregister null-ptr-ref bug by find prog first. - Fix xcall_comm_write write empty null-ptr-ref bug in memdup_user_nul(). - Add empty owner, exceed 64 prog name and repeat syscall check in check_prog(). - Move INIT_LIST_HEAD(&prog->list) to xcall_prog_register() instead of kernel module. Changes in v7: - Fix alternative bug in sync ventry. - Add "xcall" limit for xcall2.0 and hardware xcall. Changes in v6: - Add "xcall=debug" debug mode to use the "fast syscall" for every system call. - Use alternative to reduce the baseline performance noise floor when not set "xcall" on the kernel cmdline - Move binary_path out from xcall struct, and add to xcall_comm struct. - Fix1. insert_xcall_locked() check both "name" and "binary" to avoid repeated attach same name of xcall. - Fix2. Check if it is an executable file for the binary path. - Fix3. Check if it is an absolute path for the binary path. - Fix4. Remove the extra free_xcall_comm(info) in default branch in proc_xcall_command(). - Fix5. Add zero syscall hijack check for xcall_prog_register(). - Use __arm64_sys_ni_syscall() instead of define inv_xcall(). - Replace the -ENOSYS return value with -EINVAL, to avoid the warning. Changes in v5: - Fix build problem. - el0t_64_sync_ventry jump to kernel_ventry to do VMAP_STACK. - Some cleanups. - Merge the three refactor patch. Changes in v4: - Reuse uprobe_write_opcode() instead of use __replace_page() and copy_to_page(). - Handle error for uprobe_write_opcode(). - Support xcall1.0 before 920G. - Change xcall1.0 bitmap to byte array to save check insns. - Use percpu variable to save check insns for xcall1.0. - A little cleanup. Changes in v3: - Add validity checks during xcall registration to prevent out-of-bounds access and null pointer dereferences. - Extract __replace_page() and copy_to_page() from uprobe, to avoid code duplication. - Replace with new compatible refactored code. - Remove unnecessary member, such as old_name. Jinjie Ruan (2): xcall2.0: Support xcall1.0 for hardware xcall openeuler_defconfig: Enable CONFIG_DYNAMIC_XCALL by default Liao Chang (6): xcall2.0: Add userspace proc interface xcall2.0: Add xcall module register interface xcall2.0: Add xcall_area xcall2.0: Hajack syscall with dynamic instruciton replace xcall: Rework the early exception vector of XCALL and SYNC xcall2.0: Add a basic testcase Yipeng Zou (1): xcall: Add debug mode to force fast syscall for all threads arch/arm64/Kconfig.turbo | 13 + arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/exception.h | 4 +- arch/arm64/include/asm/mmu_context.h | 7 - arch/arm64/include/asm/xcall.h | 154 ++++---- arch/arm64/kernel/cpufeature.c | 79 ++-- arch/arm64/kernel/entry-common.c | 28 +- arch/arm64/kernel/entry.S | 86 +---- arch/arm64/kernel/probes/uprobes.c | 6 + arch/arm64/kernel/process.c | 5 + arch/arm64/kernel/syscall.c | 14 + arch/arm64/kernel/xcall/Makefile | 3 +- arch/arm64/kernel/xcall/core.c | 403 +++++++++++++++++++++ arch/arm64/kernel/xcall/entry.S | 139 +++++-- arch/arm64/kernel/xcall/proc.c | 234 ++++++++++++ arch/arm64/kernel/xcall/xcall.c | 68 ++-- arch/arm64/kvm/sys_regs.c | 1 + drivers/staging/Kconfig | 2 + drivers/staging/Makefile | 1 + drivers/staging/xcall/Kconfig | 19 + drivers/staging/xcall/Makefile | 1 + drivers/staging/xcall/dynamic_xcall_test.c | 89 +++++ fs/proc/proc_xcall.c | 144 ++------ include/linux/mm_types.h | 4 + include/linux/xcall.h | 51 +++ kernel/events/uprobes.c | 23 ++ kernel/fork.c | 3 + mm/mmap.c | 14 +- 28 files changed, 1222 insertions(+), 374 deletions(-) create mode 100644 arch/arm64/kernel/xcall/core.c create mode 100644 arch/arm64/kernel/xcall/proc.c create mode 100644 drivers/staging/xcall/Kconfig create mode 100644 drivers/staging/xcall/Makefile create mode 100644 drivers/staging/xcall/dynamic_xcall_test.c create mode 100644 include/linux/xcall.h -- 2.34.1

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[PATCH OLK-5.10 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages. Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 722 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++++ 7 files changed, 924 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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[PATCH OLK-6.6 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages. Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 943 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++ 7 files changed, 1145 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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[PATCH OLK-6.6] misc: uacce - fix a null pointer access issue when poweroff
by Chenghai Huang 14 Nov '25

14 Nov '25

driver inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/ID6IAP CVE: NA ---------------------------------------------------------------------- When "poweroff -f" is call in virt, if there are accelerator services that have not yet completed, a situation may arise where uacce_fops_release and uacce_remove are executed concurrently. This can lead to the uacce_put_queue operation in uacce_fops_release accessing an empty ops pointer. Fixes: 642aa7325494 ("uacce: add stop_queue to replace put_queue in ioctl") Signed-off-by: Chenghai Huang <huangchenghai2(a)huawei.com> Signed-off-by: JiangShui Yang <yangjiangshui(a)h-partners.com> --- drivers/misc/uacce/uacce.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c index 04f2658712da..4dcf3bff4c8f 100644 --- a/drivers/misc/uacce/uacce.c +++ b/drivers/misc/uacce/uacce.c @@ -47,10 +47,13 @@ static int uacce_stop_queue(struct uacce_queue *q) { struct uacce_device *uacce = q->uacce; - if ((q->state == UACCE_Q_STARTED) && uacce->ops->stop_queue) + if (q->state != UACCE_Q_STARTED) + return 0; + + if (uacce->ops->stop_queue) uacce->ops->stop_queue(q); - q->state = UACCE_Q_ZOMBIE; + q->state = UACCE_Q_INIT; return 0; } @@ -61,8 +64,13 @@ static void uacce_put_queue(struct uacce_queue *q) uacce_stop_queue(q); + if (q->state != UACCE_Q_INIT) + return; + if (uacce->ops->put_queue) uacce->ops->put_queue(q); + + q->state = UACCE_Q_ZOMBIE; } static long uacce_get_ss_dma(struct uacce_queue *q, void __user *arg) -- 2.43.0

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[PATCH OLK-5.10 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages (2MB). Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 693 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++++ 7 files changed, 895 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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[PATCH OLK-5.10 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages (2MB). Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 693 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++++ 7 files changed, 895 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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[PATCH OLK-6.6 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages (2MB). Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 916 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++ 7 files changed, 1118 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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[PATCH OLK-6.6 v8 0/9] Add xcall 2.0 support
by Jinjie Ruan 14 Nov '25

14 Nov '25

Add xcall 2.0 support, which is compatible with xcall1.0, and can be used to dynamic instruction replacement for hardware xcall. Changes in v8: - Fix no reigister and unregister null-ptr-ref bug by find prog first. - Fix xcall_comm_write write empty null-ptr-ref bug in memdup_user_nul(). - Add empty owner, exceed 64 prog name and repeat syscall check in check_prog(). - Move INIT_LIST_HEAD(&prog->list) to xcall_prog_register() instead of kernel module. Changes in v7: - Fix alternative bug in sync ventry. - Add "xcall" limit for xcall2.0 and hardware xcall. Changes in v6: - Add "xcall=debug" debug mode to use the "fast syscall" for every system call. - Use alternative to reduce the baseline performance noise floor when not set "xcall" on the kernel cmdline - Move binary_path out from xcall struct, and add to xcall_comm struct. - Fix1. insert_xcall_locked() check both "name" and "binary" to avoid repeated attach same name of xcall. - Fix2. Check if it is an executable file for the binary path. - Fix3. Check if it is an absolute path for the binary path. - Fix4. Remove the extra free_xcall_comm(info) in default branch in proc_xcall_command(). - Fix5. Add zero syscall hijack check for xcall_prog_register(). - Use __arm64_sys_ni_syscall() instead of define inv_xcall(). - Replace the -ENOSYS return value with -EINVAL, to avoid the warning. Changes in v5: - Fix build problem. - el0t_64_sync_ventry jump to kernel_ventry to do VMAP_STACK. - Some cleanups. - Merge the three refactor patch. Changes in v4: - Reuse uprobe_write_opcode() instead of use __replace_page() and copy_to_page(). - Handle error for uprobe_write_opcode(). - Support xcall1.0 before 920G. - Change xcall1.0 bitmap to byte array to save check insns. - Use percpu variable to save check insns for xcall1.0. - A little cleanup. Changes in v3: - Add validity checks during xcall registration to prevent out-of-bounds access and null pointer dereferences. - Extract __replace_page() and copy_to_page() from uprobe, to avoid code duplication. - Replace with new compatible refactored code. - Remove unnecessary member, such as old_name. Jinjie Ruan (2): xcall2.0: Support xcall1.0 for hardware xcall openeuler_defconfig: Enable CONFIG_DYNAMIC_XCALL by default Liao Chang (6): xcall2.0: Add userspace proc interface xcall2.0: Add xcall module register interface xcall2.0: Add xcall_area xcall2.0: Hajack syscall with dynamic instruciton replace xcall: Rework the early exception vector of XCALL and SYNC xcall2.0: Add a basic testcase Yipeng Zou (1): xcall: Add debug mode to force fast syscall for all threads arch/arm64/Kconfig.turbo | 13 + arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/exception.h | 4 +- arch/arm64/include/asm/mmu_context.h | 7 - arch/arm64/include/asm/xcall.h | 154 ++++---- arch/arm64/kernel/cpufeature.c | 79 ++-- arch/arm64/kernel/entry-common.c | 28 +- arch/arm64/kernel/entry.S | 86 +---- arch/arm64/kernel/probes/uprobes.c | 6 + arch/arm64/kernel/process.c | 5 + arch/arm64/kernel/syscall.c | 14 + arch/arm64/kernel/xcall/Makefile | 3 +- arch/arm64/kernel/xcall/core.c | 403 +++++++++++++++++++++ arch/arm64/kernel/xcall/entry.S | 139 +++++-- arch/arm64/kernel/xcall/proc.c | 229 ++++++++++++ arch/arm64/kernel/xcall/xcall.c | 66 ++-- arch/arm64/kvm/sys_regs.c | 1 + drivers/staging/Kconfig | 2 + drivers/staging/Makefile | 1 + drivers/staging/xcall/Kconfig | 19 + drivers/staging/xcall/Makefile | 1 + drivers/staging/xcall/dynamic_xcall_test.c | 89 +++++ fs/proc/proc_xcall.c | 144 ++------ include/linux/mm_types.h | 4 + include/linux/xcall.h | 51 +++ kernel/events/uprobes.c | 23 ++ kernel/fork.c | 3 + mm/mmap.c | 14 +- 28 files changed, 1215 insertions(+), 374 deletions(-) create mode 100644 arch/arm64/kernel/xcall/core.c create mode 100644 arch/arm64/kernel/xcall/proc.c create mode 100644 drivers/staging/xcall/Kconfig create mode 100644 drivers/staging/xcall/Makefile create mode 100644 drivers/staging/xcall/dynamic_xcall_test.c create mode 100644 include/linux/xcall.h -- 2.34.1

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[PATCH openEuler-1.0-LTS 0/2] Fix CVE-2025-39964
by Gu Bowen 14 Nov '25

14 Nov '25

CVE-2025-39964 Eric Biggers (1): crypto: af_alg - Fix incorrect boolean values in af_alg_ctx Herbert Xu (1): crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg crypto/af_alg.c | 7 +++++++ include/crypto/if_alg.h | 10 ++++++---- 2 files changed, 13 insertions(+), 4 deletions(-) -- 2.43.0

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[PATCH OLK-6.6 0/5] zcopy: A zero-copy data transfer mechanism for HPC
by Liu Mingrui 14 Nov '25

14 Nov '25

This patchset provides a PAGEATTACH mechanism, a zero-copy data transfer solution optimized for High Performance Computing (HPC) workloads. It allows direct sharing of physical memory pages between distinct processes by mapping source pages to a target address space, eliminating redundant data copying and improving large data transfer efficiency. Key features: - Supports zero-copy communication between intra-node processes. - Handles both PTE-level small pages and PMD-level huge pages (2MB). Liu Mingrui (5): zcopy: Initialize zcopy module zcopy: Introduce the pageattach interface zcopy: Extend PMD trans hugepage mapping ability zcopy: Add tracepoint for PageAttach zcopy: Add debug inerface dump_pagetable MAINTAINERS | 6 + drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/zcopy/Kconfig | 32 ++ drivers/zcopy/Makefile | 2 + drivers/zcopy/zcopy.c | 902 ++++++++++++++++++++++++++++++++++ include/trace/events/attach.h | 157 ++++++ 7 files changed, 1104 insertions(+) create mode 100644 drivers/zcopy/Kconfig create mode 100644 drivers/zcopy/Makefile create mode 100644 drivers/zcopy/zcopy.c create mode 100644 include/trace/events/attach.h -- 2.25.1

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