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 [3]. This series aims to improve the way FPSIMD context is handled by KVM. Only minor changes have been made since the previous v5 [1]. The changes are summarised in the individual patches. Patch 6 is new, and does some simple refactoring to enable new bits to be added to an existing vcpu_arch flags field. Patches 1, 2, 6, 7 and 14 are still missing Reviewed-bys/Acked-bys, so reviewer attention on these patches would be much appreciated. Some testing done on Juno and the Arm fast model (arm64), including (on earlier versions of the patches) combinations of (non-)SVE and (non-)VHE configurations. Cheers ---Dave [1] [PATCH v5 00/14] KVM: arm64: Optimise FPSIMD context switching http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/575805.html [2] [RFC PATCH 0/6] Simplify setting thread flags to a particular value https://lkml.org/lkml/2018/4/19/225 [3] linux-arm-kernel archive http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/thread.html Christoffer Dall (1): KVM: arm/arm64: Introduce kvm_arch_vcpu_run_pid_change Dave Martin (14): 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 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 | 9 ++- arch/arm64/Kconfig | 7 ++ arch/arm64/include/asm/cpufeature.h | 29 --------- arch/arm64/include/asm/fpsimd.h | 20 ++++++ arch/arm64/include/asm/kvm_asm.h | 3 + arch/arm64/include/asm/kvm_host.h | 24 ++++--- arch/arm64/include/asm/processor.h | 2 + arch/arm64/kernel/fpsimd.c | 120 ++++++++++++++++++----------------- 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 | 123 +++++++++++++++++++++++++----------- arch/arm64/kvm/hyp/sysreg-sr.c | 4 +- arch/arm64/kvm/sys_regs.c | 8 +-- 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 | 25 +++++++- virt/kvm/kvm_main.c | 7 +- 25 files changed, 383 insertions(+), 217 deletions(-) create mode 100644 arch/arm64/kvm/fpsimd.c -- 2.1.4
