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. v2 -> v3 - Reworked the architecture specific parts, to only provide on addtional implementation - Renamed function to kvm_async_page_present_(sync|async) - Fixing KVM_HVA_ERR_BAD handling v1 -> v2: - Adding other architecture backends - Adding documentation for the ioctl - Improving the overall error handling - Reducing the needed modifications on the common code Dominik Dingel (4): PF: Add FAULT_FLAG_RETRY_NOWAIT for guest fault PF: Make KVM_HVA_ERR_BAD usable on s390 PF: Provide additional direct page notification PF: Async page fault support on s390 Documentation/s390/kvm.txt | 24 +++++++++ arch/s390/include/asm/kvm_host.h | 22 ++++++++ arch/s390/include/asm/pgtable.h | 2 + arch/s390/include/asm/processor.h | 1 + arch/s390/include/uapi/asm/kvm.h | 10 ++++ arch/s390/kvm/Kconfig | 2 + arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/diag.c | 57 ++++++++++++++++++++ arch/s390/kvm/interrupt.c | 38 ++++++++++--- arch/s390/kvm/kvm-s390.c | 111 ++++++++++++++++++++++++++++++++++++++ arch/s390/kvm/kvm-s390.h | 4 ++ arch/s390/kvm/sigp.c | 2 + arch/s390/mm/fault.c | 26 +++++++-- arch/x86/kvm/mmu.c | 2 +- include/linux/kvm_host.h | 16 +++++- include/uapi/linux/kvm.h | 2 + virt/kvm/Kconfig | 4 ++ virt/kvm/async_pf.c | 22 ++++++-- 18 files changed, 330 insertions(+), 17 deletions(-) -- 1.8.2.2 -- 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>