Concerns were expressed around (ab)using #PF for KVM's async_pf mechanism, it seems that re-using #PF exception for a PV mechanism wasn't a great idea after all. The Grand Plan is to switch to using e.g. #VE for 'page not present' events and normal APIC interrupts for 'page ready' events. This series does the later. Changes since v1: - struct kvm_vcpu_pv_apf_data's fields renamed to 'flags' and 'token', comments added [Vivek Goyal] - 'type1/2' names for APF events dropped from everywhere [Vivek Goyal] - kvm_arch_can_inject_async_page_present() renamed to kvm_arch_can_dequeue_async_page_present [Vivek Goyal] - 'KVM: x86: deprecate KVM_ASYNC_PF_SEND_ALWAYS' patch added. v1: https://lore.kernel.org/kvm/20200511164752.2158645-1-vkuznets@xxxxxxxxxx/ QEMU patches for testing: https://github.com/vittyvk/qemu.git (async_pf2_v2 branch) Vitaly Kuznetsov (10): Revert "KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously" KVM: x86: extend struct kvm_vcpu_pv_apf_data with token info KVM: rename kvm_arch_can_inject_async_page_present() to kvm_arch_can_dequeue_async_page_present() KVM: introduce kvm_read_guest_offset_cached() KVM: x86: interrupt based APF 'page ready' event delivery KVM: x86: acknowledgment mechanism for async pf page ready notifications KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT KVM: x86: Switch KVM guest to using interrupts for page ready APF delivery KVM: x86: drop KVM_PV_REASON_PAGE_READY case from kvm_handle_page_fault() KVM: x86: deprecate KVM_ASYNC_PF_SEND_ALWAYS Documentation/virt/kvm/cpuid.rst | 6 ++ Documentation/virt/kvm/msr.rst | 120 +++++++++++++++------ arch/s390/include/asm/kvm_host.h | 4 +- arch/s390/kvm/kvm-s390.c | 2 +- arch/x86/entry/entry_32.S | 5 + arch/x86/entry/entry_64.S | 5 + arch/x86/include/asm/hardirq.h | 3 + arch/x86/include/asm/irq_vectors.h | 6 +- arch/x86/include/asm/kvm_host.h | 12 ++- arch/x86/include/asm/kvm_para.h | 10 +- arch/x86/include/uapi/asm/kvm_para.h | 19 +++- arch/x86/kernel/irq.c | 9 ++ arch/x86/kernel/kvm.c | 62 +++++++---- arch/x86/kvm/cpuid.c | 3 +- arch/x86/kvm/mmu/mmu.c | 19 ++-- arch/x86/kvm/svm/nested.c | 2 +- arch/x86/kvm/svm/svm.c | 3 +- arch/x86/kvm/vmx/nested.c | 2 +- arch/x86/kvm/vmx/vmx.c | 5 +- arch/x86/kvm/x86.c | 149 ++++++++++++++++++--------- include/linux/kvm_host.h | 3 + include/uapi/linux/kvm.h | 1 + virt/kvm/async_pf.c | 12 ++- virt/kvm/kvm_main.c | 19 +++- 24 files changed, 344 insertions(+), 137 deletions(-) -- 2.25.4
