This is the backport of the arm64 SSBD patches to 4.17. Not much to say here, this is basically what went into 4.18.
4.14 and 4.9 to follow.
Thanks,
M.
Marc Zyngier (14): arm/arm64: smccc: Add SMCCC-specific return codes arm64: Call ARCH_WORKAROUND_2 on transitions between EL0 and EL1 arm64: Add per-cpu infrastructure to call ARCH_WORKAROUND_2 arm64: Add ARCH_WORKAROUND_2 probing arm64: Add 'ssbd' command-line option arm64: ssbd: Add global mitigation state accessor arm64: ssbd: Skip apply_ssbd if not using dynamic mitigation arm64: ssbd: Restore mitigation status on CPU resume arm64: ssbd: Introduce thread flag to control userspace mitigation arm64: ssbd: Add prctl interface for per-thread mitigation arm64: KVM: Add HYP per-cpu accessors arm64: KVM: Add ARCH_WORKAROUND_2 support for guests arm64: KVM: Handle guest's ARCH_WORKAROUND_2 requests arm64: KVM: Add ARCH_WORKAROUND_2 discovery through ARCH_FEATURES_FUNC_ID
.../admin-guide/kernel-parameters.txt | 17 ++ arch/arm/include/asm/kvm_host.h | 12 ++ arch/arm/include/asm/kvm_mmu.h | 5 + arch/arm64/Kconfig | 9 + arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/cpufeature.h | 22 +++ arch/arm64/include/asm/kvm_asm.h | 30 ++- arch/arm64/include/asm/kvm_host.h | 26 +++ arch/arm64/include/asm/kvm_mmu.h | 24 +++ arch/arm64/include/asm/thread_info.h | 1 + arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kernel/cpu_errata.c | 180 ++++++++++++++++++ arch/arm64/kernel/entry.S | 30 +++ arch/arm64/kernel/hibernate.c | 11 ++ arch/arm64/kernel/ssbd.c | 110 +++++++++++ arch/arm64/kernel/suspend.c | 8 + arch/arm64/kvm/hyp/hyp-entry.S | 38 +++- arch/arm64/kvm/hyp/switch.c | 42 ++++ arch/arm64/kvm/reset.c | 4 + include/linux/arm-smccc.h | 10 + virt/kvm/arm/arm.c | 4 + virt/kvm/arm/psci.c | 18 +- 23 files changed, 600 insertions(+), 6 deletions(-) create mode 100644 arch/arm64/kernel/ssbd.c