This series build towards protecting of FPSIMD state in protected KVM. Most of the series is refactoring to create separation between host and hyp for when that is needed. There was the need to track where a vcpu last loaded its FPSIMD state so I've also made use of this to avoid needless reloading of vcpu FPSIMD state when that's possible. I don't know if this makes any performance difference and don't know what a meaningful benchmark would be to measure against so help and advice on this front would be appreciated. The last patch in the series is concerned with the protecting of a protected VM's FPSIMD state. It will depend on knowing which vcpus are protected and having a stage 2 over the host but demonstrates the trapping and lazy switching that I had in mind. The series has, so far, only been lightly tested on qemu with paranoia running on the host and in the vcpu. It applies atop 5.12-rc. This is similar, but much evolved, version of a series sent out last year: https://lore.kernel.org/r/20200713210505.2959828-1-ascull@xxxxxxxxxx/ Andrew Scull (10): KVM: arm64: Leave KVM_ARM64_DEBUG_DIRTY updates to the host KVM: arm64: Synchronize vcpu FPSIMD in the host KVM: arm64: Unmap host task thread flags from hyp KVM: arm64: Support smp_processor_id() in nVHE hyp KVM: arm64: Track where vcpu FP state was last loaded KVM: arm64: Avoid needlessly reloading guest FP state KVM: arm64: Separate host and hyp vcpu FP flags KVM: arm64: Pass the arch run struct explicitly KVM: arm64: Use hyp-private run struct in protected mode RFC: KVM: arm64: Manage FPSIMD state at EL2 for protected vCPUs arch/arm64/include/asm/fpsimd.h | 1 + arch/arm64/include/asm/kvm_host.h | 46 +++++++--- arch/arm64/include/asm/kvm_hyp.h | 1 + arch/arm64/kernel/fpsimd.c | 11 ++- arch/arm64/kvm/arm.c | 8 +- arch/arm64/kvm/debug.c | 2 + arch/arm64/kvm/fpsimd.c | 69 +++++++++++---- arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 2 - arch/arm64/kvm/hyp/include/hyp/switch.h | 57 ++++++------ arch/arm64/kvm/hyp/nvhe/hyp-main.c | 24 ++++++ arch/arm64/kvm/hyp/nvhe/hyp-smp.c | 2 + arch/arm64/kvm/hyp/nvhe/switch.c | 100 ++++++++++++++++++---- arch/arm64/kvm/hyp/vhe/switch.c | 8 +- 13 files changed, 249 insertions(+), 82 deletions(-) -- 2.30.1.766.gb4fecdf3b7-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
