Gleb, Paolo, based on the work from Martin and Carsten, this implementation enables async page faults. To the guest it will provide the pfault interface, but internally it uses the async page fault common code. The inital submission and it's discussion can be followed on http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg63359.html . There is a slight modification for common code to move from a pull to a push based approch on s390. As s390 we don't want to wait till we leave the guest state to queue the notification interrupts. To use this feature the controlling userspace hase to enable the capability. With that knob we can later on disable this feature for live migration. Dominik Dingel (4): PF: Add FAULT_FLAG_RETRY_NOWAIT for guest fault PF: Move architecture specifics to the backends PF: Additional flag for direct page fault inject PF: Intial async page fault support on s390x arch/s390/include/asm/kvm_host.h | 34 +++++++++++++ arch/s390/include/asm/processor.h | 7 +++ arch/s390/include/uapi/asm/kvm.h | 10 ++++ arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/diag.c | 46 +++++++++++++++++ arch/s390/kvm/interrupt.c | 40 ++++++++++++--- arch/s390/kvm/kvm-s390.c | 101 ++++++++++++++++++++++++++++++++++++++ arch/s390/kvm/kvm-s390.h | 4 ++ arch/s390/mm/fault.c | 29 +++++++++-- arch/s390/mm/pgtable.c | 1 + arch/x86/include/asm/kvm_host.h | 8 +++ arch/x86/kvm/mmu.c | 2 +- include/linux/kvm_host.h | 11 +---- include/uapi/linux/kvm.h | 2 + virt/kvm/async_pf.c | 33 ++++++++++--- 16 files changed, 303 insertions(+), 28 deletions(-) -- 1.8.1.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>