[Qemu-devel] [RFC PATCH 0/6] flush/invalidate on entry/exit

[Andrew Jones]

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