Note: Most of these patches are Arm-specific. People not Cc'd on the whole series can find it in the linux-arm-kernel archive [2]. Git: see [3] This series aims to improve the way FPSIMD context is handled by KVM. Changes since the previous v10 [1] are minor, but one patch has been split. ** To Catalin Marinas, Alex Bennée: ** I have retained your Reviewed-bys on patches 7 and 8: these were split from patch 7 of v9. Although the code is (almost) the same as noted below, I advise you to take a look. (all) reviewers please note: * Patches 7 and 8 have been split from the previous patch 7, since the update to INIT_THREAD_INFO is logically a fix and deserves a Fixes: tag. I have also moved the definition of INIT_THREAD_INFO to after the TIF_* definitions that it now depends on (mysteriously this wasn't causing a compile error anyway, but I've not dug into why). * Other changes are all additions or rewordings of comments, and amendments commit messages. Cheers ---Dave [1] [PATCH v10 00/18] KVM: arm64: Optimise FPSIMD context switching http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/579899.html [2] linux-arm-kernel archive http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/thread.html [3] http://linux-arm.org/git?p=linux-dm.git;a=shortlog;h=refs/heads/kvm-vhe-fpsimd/v11 Christoffer Dall (1): KVM: arm/arm64: Introduce kvm_arch_vcpu_run_pid_change Dave Martin (18): arm64: fpsimd: Fix TIF_FOREIGN_FPSTATE after invalidating cpu regs thread_info: Add update_thread_flag() helpers arm64: Use update{,_tsk}_thread_flag() KVM: arm64: Convert lazy FPSIMD context switch trap to C arm64: fpsimd: Generalise context saving for non-task contexts arm64: fpsimd: Avoid FPSIMD context leakage for the init task arm64: fpsimd: Eliminate task->mm checks arm64/sve: Refactor user SVE trap maintenance for external use KVM: arm64: Repurpose vcpu_arch.debug_flags for general-purpose flags KVM: arm64: Optimise FPSIMD handling to reduce guest/host thrashing arm64/sve: Move read_zcr_features() out of cpufeature.h arm64/sve: Switch sve_pffr() argument from task to thread arm64/sve: Move sve_pffr() to fpsimd.h and make inline KVM: arm64: Save host SVE context as appropriate KVM: arm64: Remove eager host SVE state saving KVM: arm64: Remove redundant *exit_code changes in fpsimd_guest_exit() KVM: arm64: Fold redundant exit code checks out of fixup_guest_exit() KVM: arm64: Invoke FPSIMD context switch trap from C arch/arm/include/asm/kvm_host.h | 10 +- arch/arm64/Kconfig | 7 ++ arch/arm64/include/asm/cpufeature.h | 29 ------ arch/arm64/include/asm/fpsimd.h | 21 +++++ arch/arm64/include/asm/kvm_asm.h | 3 - arch/arm64/include/asm/kvm_host.h | 45 +++++++-- arch/arm64/include/asm/processor.h | 15 ++- arch/arm64/include/asm/thread_info.h | 13 +-- arch/arm64/kernel/fpsimd.c | 177 +++++++++++++++++------------------ arch/arm64/kernel/ptrace.c | 1 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/debug.c | 8 +- arch/arm64/kvm/fpsimd.c | 110 ++++++++++++++++++++++ arch/arm64/kvm/hyp/debug-sr.c | 6 +- arch/arm64/kvm/hyp/entry.S | 43 --------- arch/arm64/kvm/hyp/hyp-entry.S | 19 ---- arch/arm64/kvm/hyp/switch.c | 124 ++++++++++++++++-------- arch/arm64/kvm/hyp/sysreg-sr.c | 4 +- arch/arm64/kvm/sys_regs.c | 9 +- include/linux/kvm_host.h | 9 ++ include/linux/sched.h | 6 ++ include/linux/thread_info.h | 11 +++ virt/kvm/Kconfig | 3 + virt/kvm/arm/arm.c | 14 ++- virt/kvm/kvm_main.c | 7 +- 26 files changed, 437 insertions(+), 260 deletions(-) create mode 100644 arch/arm64/kvm/fpsimd.c -- 2.1.4
