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]. This series aims to improve the way FPSIMD context is handled by KVM. Only minor changes have been made since the previous v8 [1], though this posting does apply a couple of fixes. This is a minor update to fix a couple of build breaks introduced late in the evolution of the series. [3] [4] There is also an unexplained NULL-dereference bug observed by Marc on ESPRESSOBin [5] that I need to look into. We've not been able to reproduce this so far. In the meantime, this post will give people an opportunity to look over the current changes. The changes are summarised in the individual patches. Reviewers please note: * **Only patches 8 and 12** have changed since v8. * I have stripped tags from patch 12 due to the introduction of a new source file, which may not be the best approach. If Christoffer, Marc and Catalin could take another look that would be much appreciated. Cheers ---Dave [1] [PULL v8] KVM: arm64: Optimise FPSIMD context switching lists.infradead.org/pipermail/linux-arm-kernel/2018-May/578184.html [2] linux-arm-kernel archive http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/thread.html [3] [kvmarm:queue 9/29] arch/arm/kvm/../../../virt/kvm/arm/arm.c:783:3: error: implicit declaration of function 'kvm_arch_vcpu_ctxsync_fp'; did you mean 'kvm_arch_vcpu_put_fp'? http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/579400.html [4] [kvmarm:queue 13/29] arch/arm/kvm/../../../virt/kvm/arm/arm.c:1598:6: error: implicit declaration of function 'system_supports_sve' http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/579399.html [5] [PULL v8] KVM: arm64: Optimise FPSIMD context switching http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/579353.html Christoffer Dall (1): KVM: arm/arm64: Introduce kvm_arch_vcpu_run_pid_change Dave Martin (15): 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/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 | 33 +++++--- arch/arm64/include/asm/processor.h | 2 + arch/arm64/kernel/fpsimd.c | 147 +++++++++++++++++++----------------- arch/arm64/kernel/ptrace.c | 1 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/Makefile | 4 +- arch/arm64/kvm/debug.c | 8 +- arch/arm64/kvm/fpsimd.c | 111 +++++++++++++++++++++++++++ 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/init.c | 33 ++++++++ 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 | 13 +++- virt/kvm/kvm_main.c | 7 +- 26 files changed, 430 insertions(+), 234 deletions(-) create mode 100644 arch/arm64/kvm/fpsimd.c create mode 100644 arch/arm64/kvm/init.c -- 2.1.4
