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[PATCH 00/27] ARM Scalable Vector Extension (SVE)

This series implements Linux kernel support for the ARM Scalable VectorExtension (SVE). [1]  It supersedes the previous RFC: see [6] for linkand a summary of changes.This series depends on some series that are headed for v4.14:see [3], [4], [5].To reduce spam, some people may not been copied on the entire series.For those who did not receive the whole series, it can be found in thelinux-arm-kernel archive. [2]*Note* The final two patches (26-27) of the series are still RFC --before committing to this ABI it would be good to get feedback onwhether the approach makes sense and whether it suitable for otherarchitectures.  These two patches are not required by the rest of theseries and can be revised or merged later.Support for use of SVE by KVM guests is not currently included.Instead, such use will be trapped and reflected to the guest asundefined instruction execution.  SVE is hidden from the view of theCPU feature registers visible to guests, so that guests will notexpect it to work.This series has been build- and boot-tested on Juno r0 and the ARM FVPBase model with SVE plugin.  Because there is no hardware with SVEsupport yet, testing of the SVE functionality has only been performed onthe model.Regression testing using LTP is under way and has also been completed onprevious versions of this series.Series summary: * Patches 1-5 contain some individual bits of preparatory spadework,   which are indirectly related to SVE.Dave Martin (5):  regset: Add support for dynamically sized regsets  arm64: KVM: Hide unsupported AArch64 CPU features from guests  arm64: efi: Add missing Kconfig dependency on KERNEL_MODE_NEON  arm64: Port deprecated instruction emulation to new sysctl interface  arm64: fpsimd: Simplify uses of {set,clear}_ti_thread_flag()   Non-trivial changes among these are:   * Patch 1: updates the regset core code to handle regsets whose size     is not fixed at compile time.  This avoids bloating coredumps even     though the maximum theoretical SVE regset size is large.   * Patch 2: extends KVM to modify the ARM architectural ID registers     seen by guests, by trapping and emulating certain registers.  For     SVE this is a temporary measure, but it may be useful for other     architecture extensions.  This patch may also be built on in the     future, since the only registers currently emulated are those     required for hiding SVE. * Patches 6-10 add SVE-specific system register and structure layout   definitions, and the low-level boot code and accessors needed for   making use of SVE.Dave Martin (5):  arm64/sve: System register and exception syndrome definitions  arm64/sve: Low-level SVE architectural state manipulation functions  arm64/sve: Kconfig update and conditional compilation support  arm64/sve: Signal frame and context structure definition  arm64/sve: Low-level CPU setup * Patches 11-13 implement the core context management facilities to   provide each user task with its own SVE register context, signal   handling facilities, and sane programmer's model interoperation   between SVE and FPSIMD.Dave Martin (3):  arm64/sve: Core task context handling  arm64/sve: Support vector length resetting for new processes  arm64/sve: Signal handling support * Patches 14-15 provide backend logic for detecting and making use of   the different SVE vector lengths supported by the hardware.Dave Martin (2):  arm64/sve: Backend logic for setting the vector length  arm64/sve: Probe SVE capabilities and usable vector lengths * Patches 16-17 update the kernel-mode NEON / EFI FPSIMD frameworks to   interoperate correctly with SVE.Dave Martin (2):  arm64/sve: Preserve SVE registers around kernel-mode NEON use  arm64/sve: Preserve SVE registers around EFI runtime service calls * Patches 18-20 implement the userspace frontend for managing SVE,   comprising ptrace, some new arch-specific prctl() calls, and a new   sysctl for init-time setup.Dave Martin (3):  arm64/sve: ptrace and ELF coredump support  arm64/sve: Add prctl controls for userspace vector length management  arm64/sve: Add sysctl to set the default vector length for new    processes * Patches 21-23 provide stub KVM extensions for using KVM only on the   host, while denying guest access.  (A future series will extend this   with full support for SVE in guests.)Dave Martin (3):  arm64/sve: KVM: Prevent guests from using SVE  arm64/sve: KVM: Treat guest SVE use as undefined instruction    execution  arm64/sve: KVM: Hide SVE from CPU features exposed to guestsAnd finally: * Patch 24 disengages the safety catch, enabling the kernel SVE runtime   support and allowing userspace to use SVE.Dave Martin (1):  arm64/sve: Detect SVE and activate runtime support * Patch 25 adds some basic documentation.Dave Martin (1):  arm64/sve: Add documentation * Patches 26-27 (which may be considered RFC) propose a mechanism to   report the maximum runtime signal frame size to userspace.Dave Martin (2):  arm64: signal: Report signal frame size to userspace via auxv  arm64/sve: signal: Include SVE when computing AT_MINSIGSTKSZRefernces:[1] ARM Scalable Vector Extensionhttps://community.arm.com/groups/processors/blog/2016/08/22/technology-update-the-scalable-vector-extension-sve-for-the-armv8-a-architecture[2] linux-arm-kernel August 2017 Archives by threadhttp://lists.infradead.org/pipermail/linux-arm-kernel/2017-August/thread.html[3] [PATCH v2 REPOST 0/2] arm64: Abstract syscallno manipulationhttp://lists.infradead.org/pipermail/linux-arm-kernel/2017-August/522736.htmlAccepted by Catalin for v4.14.[4] [PATCH 0/5] Simplify kernel-mode NEONhttp://lists.infradead.org/pipermail/linux-arm-kernel/2017-August/523415.html(Depends on [5].)Accepted by Catalin for v4.14, pending upstream merge of [5].[5] [PATCH resend 00/18] crypto: ARM/arm64 roundup for v4.14http://lists.infradead.org/pipermail/linux-arm-kernel/2017-July/520664.htmlAccepted by Herbert Xu for v4.14.[6] [RFC PATCH v2 00/41] Scalable Vector Extension (SVE) core supporthttp://lists.infradead.org/pipermail/linux-arm-kernel/2017-March/495966.html * Account for the size of the frame link record in AT_MINSIGSTKSZ. * Give SVE insn generation macros more human-readable names.  Make SVE   insn generation macro arg names more uniform and sligntly less   cryptic.  Tidy up asm "for" loop macro. * Describe ID_AA64PFR0 SVE field in ftr_id_aa64pfr0[]: after upstream   refactoring, this must be present to derive an ELF hwcap from the   field. * Minor simplifications to head.S: promote code simplicity over   avoiding MSRs, since this is a cold path. * Get rid of obsolete (and dodgy) sve_state() struct template macro.   Explicit offset/size calculations are used instead.  The removal of   variably-modified types also permits some trivial functions to be   inlined in the source. * Adapt to simplified kernel-mode NEON / EFI FPSIMD framework. * ptrace: Flush regs back to thread_struct before dumping NT_ARM_SVE.   This is currently redundant, since NT_PRFPREG happens to be dumped   out first, and the flush done for that regset happens to flush the   SVE regs too.  But this might change someday.  This isn't a hot path,   so an extra flush isn't the end of the world. * PR_SVE_{SET,GET}_VL: Flags and vector length arguments for SET_VL   merged (ABI change).  This makes saving and restoring the vector   length and flags a good deal less painful. * PR_SVE_SET_VL: (And all other VL-setting interfaces): clamp VL to   8192.  Some features of the SVE ISA won't work as expected if future   arch revisions ever permit VLs above 8192, so we'll need userspace to   request this explicitly.  This allows SET_VL(SVE_VL_MAX) to continue   to work as expected today. * thread_struct.sve_flags member removed.  These flag(s) are made into   thread flags instead. * VL_THREAD flag for VL setting (via ptrace/prctl) removed.  This is   only protecting userspace from itself, so it's superfluous.  Instead,   VL setting will always affect the current thread only.   General-purpose code shouldn't be setting the VL in the first place. * TIF_SVE_VL_INHERIT flag (previously VL_INHERIT) now accessible via   ptrace flags too. * Migrate default vl procfs interface to use sysctl.  Reinventing the   wheel here is error-prone and unnecessary. * Improve system_supports_sve() to remove dead code when   CONFIG_ARM64_SVE=n, * Fixed a use-before-allocation bug for dynamically allocated SVE task   state. * Probe available vector lengths: SVE doesn't require every vector   length up to the maximum to be supported by the hardware -- only   power-of-two lengths are required.  The common vector lengths across   all early CPUs are determined, and these are the vector lengths that   userspace is permitted to set.  Late secondaries that lack support   for any of these vector lengths are rejected.  (There will be at   least one common VL, since support for VL=16 is mandatory.) * SIGILL userspace cleanly when SVE use is attempted, if the kernel or   hardware configuration doesn't fully support it. * Hide SVE from the ID registers seen by the guest, and ensure   attempted SVE use by guests is trapped and reflected to the guest as   an undef. * Patch series resplit and redescribed. * Documentation updated to reflect ABI changes.Full series and diffstat:Dave Martin (27):  regset: Add support for dynamically sized regsets  arm64: KVM: Hide unsupported AArch64 CPU features from guests  arm64: efi: Add missing Kconfig dependency on KERNEL_MODE_NEON  arm64: Port deprecated instruction emulation to new sysctl interface  arm64: fpsimd: Simplify uses of {set,clear}_ti_thread_flag()  arm64/sve: System register and exception syndrome definitions  arm64/sve: Low-level SVE architectural state manipulation functions  arm64/sve: Kconfig update and conditional compilation support  arm64/sve: Signal frame and context structure definition  arm64/sve: Low-level CPU setup  arm64/sve: Core task context handling  arm64/sve: Support vector length resetting for new processes  arm64/sve: Signal handling support  arm64/sve: Backend logic for setting the vector length  arm64/sve: Probe SVE capabilities and usable vector lengths  arm64/sve: Preserve SVE registers around kernel-mode NEON use  arm64/sve: Preserve SVE registers around EFI runtime service calls  arm64/sve: ptrace and ELF coredump support  arm64/sve: Add prctl controls for userspace vector length management  arm64/sve: Add sysctl to set the default vector length for new    processes  arm64/sve: KVM: Prevent guests from using SVE  arm64/sve: KVM: Treat guest SVE use as undefined instruction execution  arm64/sve: KVM: Hide SVE from CPU features exposed to guests  arm64/sve: Detect SVE and activate runtime support  arm64/sve: Add documentation  arm64: signal: Report signal frame size to userspace via auxv  arm64/sve: signal: Include SVE when computing AT_MINSIGSTKSZ Documentation/arm64/sve.txt              | 454 ++++++++++++++++++++ arch/arm64/Kconfig                       |  12 + arch/arm64/include/asm/cpu.h             |   4 + arch/arm64/include/asm/cpucaps.h         |   3 +- arch/arm64/include/asm/cpufeature.h      |  34 ++ arch/arm64/include/asm/elf.h             |   5 + arch/arm64/include/asm/esr.h             |   3 +- arch/arm64/include/asm/fpsimd.h          |  68 ++- arch/arm64/include/asm/fpsimdmacros.h    | 137 ++++++ arch/arm64/include/asm/kvm_arm.h         |   4 +- arch/arm64/include/asm/processor.h       |  10 + arch/arm64/include/asm/sysreg.h          |  16 + arch/arm64/include/asm/thread_info.h     |   2 + arch/arm64/include/asm/traps.h           |   2 + arch/arm64/include/uapi/asm/auxvec.h     |   3 +- arch/arm64/include/uapi/asm/hwcap.h      |   1 + arch/arm64/include/uapi/asm/ptrace.h     | 130 ++++++ arch/arm64/include/uapi/asm/sigcontext.h | 113 ++++- arch/arm64/kernel/armv8_deprecated.c     |  15 +- arch/arm64/kernel/cpufeature.c           |  64 +++ arch/arm64/kernel/cpuinfo.c              |   7 + arch/arm64/kernel/entry-fpsimd.S         |  17 + arch/arm64/kernel/entry.S                |  14 +- arch/arm64/kernel/fpsimd.c               | 699 ++++++++++++++++++++++++++++++- arch/arm64/kernel/head.S                 |  13 +- arch/arm64/kernel/process.c              |   6 +- arch/arm64/kernel/ptrace.c               | 288 ++++++++++++- arch/arm64/kernel/signal.c               | 214 +++++++++- arch/arm64/kernel/signal32.c             |   2 +- arch/arm64/kernel/traps.c                |   5 +- arch/arm64/kvm/handle_exit.c             |   8 + arch/arm64/kvm/hyp/switch.c              |  12 +- arch/arm64/kvm/sys_regs.c                | 236 +++++++++-- arch/arm64/mm/proc.S                     |  14 +- fs/binfmt_elf.c                          |   6 +- include/linux/regset.h                   |  67 ++- include/uapi/linux/elf.h                 |   1 + include/uapi/linux/prctl.h               |   9 + kernel/sys.c                             |  12 + 39 files changed, 2583 insertions(+), 127 deletions(-) create mode 100644 Documentation/arm64/sve.txt-- 2.1.4
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