[PATCH v6 00/13] nommu UML
Benjamin Berg
benjamin at sipsolutions.net
Tue Jan 14 10:53:36 PST 2025
Hi,
On Tue, 2025-01-14 at 20:30 +0900, Hajime Tazaki wrote:
> This patchset is another spin of nommu mode addition to UML. It doesn't
> change a lot since the last version (v5), but contain clean ups. It would
> be nice to hear about your opinions on that.
>
> There are still several limitations/issues which we already found;
> here is the list of those issues.
>
> - memory mapped by loadable modules are not distinguished from
> userspace memory.
Maybe I am missing it, but I do not yet see proper FP register
handling. This will be needed for task/thread switches and also signal
emission/sigreturn. I am attaching the test program that I used to
verify the correct behaviour when dealing with the recent changes to FP
register handling in UML.
Benjamin
>
> -- Hajime
>
> v6:
> - rebase to the latest uml/next tree
> - more clean up on mmu/nommu for signal handling [10/13]
> - rename functions of mcontext routines [06,10/13]
> - added Acked-by tag for binfmt_elf_fdpic [02/13]
>
> v5:
> - clean up stack manipulation code [05,06,07,10/13]
> -
> https://lore.kernel.org/linux-um/cover.1733998168.git.thehajime@gmail.com/
>
> v4:
> - add arch/um/nommu, arch/x86/um/nommu to contain !MMU specific codes
> - remove zpoline patch
> - drop binfmt_elf_fdpic patch
> - reduce ifndef CONFIG_MMU if possible
> - split to elf header cleanup patch [01/13]
> - fix kernel test robot warnings [06/13]
> - fix coding styles [07/13]
> - move task_top_of_stack definition [05/13]
> -
> https://lore.kernel.org/linux-um/cover.1733652929.git.thehajime@gmail.com/
>
> v3:
> -
> https://lore.kernel.org/linux-um/cover.1733199769.git.thehajime@gmail.com/
> - add seccomp-based syscall hook in addition to zpoline [06/13]
> - remove RFC, add a line to MAINTAINERS file
> - fix kernel test robot warnings [02/13,08/13,10/13]
> - add base-commit tag to cover letter
> - pull the latest uml/next
> - clean up SIGSEGV handling [10/13]
> - detect fsgsbase availability with elf aux vector [08/13]
> - simplify vdso code with macros [09/13]
>
> RFC v2:
> -
> https://lore.kernel.org/linux-um/cover.1731290567.git.thehajime@gmail.com/
> - base branch is now uml/linux.git instead of torvalds/linux.git.
> - reorganize the patch series to clean up
> - fixed various coding styles issues
> - clean up exec code path [07/13]
> - fixed the crash/SIGSEGV case on userspace programs [10/13]
> - add seccomp filter to limit syscall caller address [06/13]
> - detect fsgsbase availability with sigsetjmp/siglongjmp [08/13]
> - removes unrelated changes
> - removes unneeded ifndef CONFIG_MMU
> - convert UML_CONFIG_MMU to CONFIG_MMU as using uml/linux.git
> - proposed a patch of maple-tree issue (resolving a limitation in RFC
> v1)
>
> https://lore.kernel.org/linux-mm/20241108222834.3625217-1-thehajime@gmail.com/
>
> RFC:
> -
> https://lore.kernel.org/linux-um/cover.1729770373.git.thehajime@gmail.com/
>
> Hajime Tazaki (13):
> x86/um: clean up elf specific definitions
> x86/um: nommu: elf loader for fdpic
> um: decouple MMU specific code from the common part
> um: nommu: memory handling
> x86/um: nommu: syscall handling
> um: nommu: seccomp syscalls hook
> x86/um: nommu: process/thread handling
> um: nommu: configure fs register on host syscall invocation
> x86/um/vdso: nommu: vdso memory update
> x86/um: nommu: signal handling
> um: change machine name for uname output
> um: nommu: add documentation of nommu UML
> um: nommu: plug nommu code into build system
>
> Documentation/virt/uml/nommu-uml.rst | 177 ++++++++++++++++++++++
> MAINTAINERS | 1 +
> arch/um/Kconfig | 14 +-
> arch/um/Makefile | 10 ++
> arch/um/configs/x86_64_nommu_defconfig | 64 ++++++++
> arch/um/include/asm/Kbuild | 1 +
> arch/um/include/asm/futex.h | 4 +
> arch/um/include/asm/mmu.h | 8 +
> arch/um/include/asm/mmu_context.h | 2 +
> arch/um/include/asm/ptrace-generic.h | 6 +
> arch/um/include/asm/uaccess.h | 7 +-
> arch/um/include/shared/kern_util.h | 12 ++
> arch/um/include/shared/os.h | 16 ++
> arch/um/kernel/Makefile | 5 +-
> arch/um/kernel/mem-pgtable.c | 55 +++++++
> arch/um/kernel/mem.c | 39 +----
> arch/um/kernel/process.c | 25 ++++
> arch/um/kernel/skas/process.c | 27 ----
> arch/um/kernel/um_arch.c | 3 +
> arch/um/nommu/Makefile | 3 +
> arch/um/nommu/os-Linux/Makefile | 7 +
> arch/um/nommu/os-Linux/signal.c | 28 ++++
> arch/um/nommu/trap.c | 188
> ++++++++++++++++++++++++
> arch/um/os-Linux/Makefile | 8 +-
> arch/um/os-Linux/internal.h | 5 +
> arch/um/os-Linux/mem.c | 4 +
> arch/um/os-Linux/process.c | 149 ++++++++++++++++++-
> arch/um/os-Linux/seccomp.c | 87 +++++++++++
> arch/um/os-Linux/signal.c | 31 +++-
> arch/um/os-Linux/skas/process.c | 132 -----------------
> arch/um/os-Linux/start_up.c | 20 +++
> arch/um/os-Linux/util.c | 3 +-
> arch/x86/um/Makefile | 7 +-
> arch/x86/um/asm/elf.h | 8 +-
> arch/x86/um/asm/module.h | 24 ---
> arch/x86/um/nommu/Makefile | 8 +
> arch/x86/um/nommu/do_syscall_64.c | 74 ++++++++++
> arch/x86/um/nommu/entry_64.S | 113 ++++++++++++++
> arch/x86/um/nommu/os-Linux/Makefile | 6 +
> arch/x86/um/nommu/os-Linux/mcontext.c | 24 +++
> arch/x86/um/nommu/syscalls.h | 16 ++
> arch/x86/um/nommu/syscalls_64.c | 115 +++++++++++++++
> arch/x86/um/shared/sysdep/mcontext.h | 4 +
> arch/x86/um/shared/sysdep/syscalls_64.h | 6 +
> arch/x86/um/signal.c | 7 +
> arch/x86/um/vdso/vma.c | 17 ++-
> fs/Kconfig.binfmt | 2 +-
> 47 files changed, 1328 insertions(+), 244 deletions(-)
> create mode 100644 Documentation/virt/uml/nommu-uml.rst
> create mode 100644 arch/um/configs/x86_64_nommu_defconfig
> create mode 100644 arch/um/kernel/mem-pgtable.c
> create mode 100644 arch/um/nommu/Makefile
> create mode 100644 arch/um/nommu/os-Linux/Makefile
> create mode 100644 arch/um/nommu/os-Linux/signal.c
> create mode 100644 arch/um/nommu/trap.c
> create mode 100644 arch/um/os-Linux/seccomp.c
> delete mode 100644 arch/x86/um/asm/module.h
> create mode 100644 arch/x86/um/nommu/Makefile
> create mode 100644 arch/x86/um/nommu/do_syscall_64.c
> create mode 100644 arch/x86/um/nommu/entry_64.S
> create mode 100644 arch/x86/um/nommu/os-Linux/Makefile
> create mode 100644 arch/x86/um/nommu/os-Linux/mcontext.c
> create mode 100644 arch/x86/um/nommu/syscalls.h
> create mode 100644 arch/x86/um/nommu/syscalls_64.c
>
>
> base-commit: 2d2b61ae38bd91217ea7cc5bc700a2b9e75b3937
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