Userspace flags memory regions as incoherent and kvm flushes/ invalidates those regions on entry/exit from userspace. Result before patch 6/6: restores coherency, waaaaay toooo sloooooow Result with patch 6/6: fast again - well, we removed the code... Andrew Jones (6): kvm: promote KVM_MEMSLOT_INCOHERENT to uapi KVM: Introduce incoherent cache maintenance API KVM: ARM: change __coherent_cache_guest_page interface KVM: ARM: extend __coherent_cache_guest_page KVM: ARM: implement kvm_*_incoherent_memory_regions KVM: ARM: no need for kvm_arch_flush_incoherent arch/arm/include/asm/kvm_mmu.h | 12 +++---- arch/arm/include/uapi/asm/kvm.h | 1 + arch/arm/kvm/arm.c | 4 +++ arch/arm/kvm/mmu.c | 72 +++++++++++++++++++++++++++++++++++++-- arch/arm64/include/asm/kvm_mmu.h | 12 ++++--- arch/arm64/include/uapi/asm/kvm.h | 1 + include/linux/kvm_host.h | 15 +++++++- include/uapi/linux/kvm.h | 1 + virt/kvm/kvm_main.c | 45 +++++++++++++++++++++++- 9 files changed, 147 insertions(+), 16 deletions(-) -- 1.8.3.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
