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* [PATCH 0/8] KVM: x86: Interrupt-based mechanism for async_pf 'page present' notifications
@ 2020-05-11 16:47 Vitaly Kuznetsov
  2020-05-11 16:47 ` [PATCH 1/8] Revert "KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously" Vitaly Kuznetsov
                   ` (9 more replies)
  0 siblings, 10 replies; 44+ messages in thread
From: Vitaly Kuznetsov @ 2020-05-11 16:47 UTC (permalink / raw)
  To: kvm, x86
  Cc: Paolo Bonzini, Andy Lutomirski, Thomas Gleixner, Borislav Petkov,
	H. Peter Anvin, Wanpeng Li, Sean Christopherson, Jim Mattson,
	Vivek Goyal, Gavin Shan, Peter Zijlstra, linux-kernel

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 RFC:
- Using #PF for 'page ready' is deprecated and removed [Paolo Bonzini]
- 'reason' field in 'struct kvm_vcpu_pv_apf_data' is not used for 'page ready'
  notifications and 'pageready_token' is not used for 'page not present' events
  [Paolo Bonzini]
- Renamed MSR_KVM_ASYNC_PF2 -> MSR_KVM_ASYNC_PF_INT [Peter Xu]
- Drop 'enabled' field from MSR_KVM_ASYNC_PF_INT [Peter Xu]
- Other minor changes supporting the above.

Vitaly Kuznetsov (8):
  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: 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()

 Documentation/virt/kvm/cpuid.rst     |   6 ++
 Documentation/virt/kvm/msr.rst       | 106 ++++++++++++++------
 arch/s390/include/asm/kvm_host.h     |   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      |   7 +-
 arch/x86/include/asm/kvm_para.h      |   6 ++
 arch/x86/include/uapi/asm/kvm_para.h |  11 ++-
 arch/x86/kernel/irq.c                |   9 ++
 arch/x86/kernel/kvm.c                |  42 ++++++--
 arch/x86/kvm/cpuid.c                 |   3 +-
 arch/x86/kvm/mmu/mmu.c               |  10 +-
 arch/x86/kvm/x86.c                   | 142 ++++++++++++++++++---------
 include/linux/kvm_host.h             |   3 +
 include/uapi/linux/kvm.h             |   1 +
 virt/kvm/async_pf.c                  |  10 ++
 virt/kvm/kvm_main.c                  |  19 +++-
 19 files changed, 295 insertions(+), 101 deletions(-)

-- 
2.25.4


^ permalink raw reply	[flat|nested] 44+ messages in thread

end of thread, other threads:[~2020-05-26 12:50 UTC | newest]

Thread overview: 44+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-11 16:47 [PATCH 0/8] KVM: x86: Interrupt-based mechanism for async_pf 'page present' notifications Vitaly Kuznetsov
2020-05-11 16:47 ` [PATCH 1/8] Revert "KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously" Vitaly Kuznetsov
2020-05-11 16:47 ` [PATCH 2/8] KVM: x86: extend struct kvm_vcpu_pv_apf_data with token info Vitaly Kuznetsov
2020-05-12 15:27   ` Vivek Goyal
2020-05-12 15:40     ` Vitaly Kuznetsov
2020-05-12 15:53       ` Vivek Goyal
2020-05-12 17:50         ` Sean Christopherson
2020-05-13  9:09           ` Vitaly Kuznetsov
2020-05-13 12:52           ` Vivek Goyal
2020-05-15 15:59             ` Paolo Bonzini
2020-05-15 18:46               ` Sean Christopherson
2020-05-15 19:18                 ` Paolo Bonzini
2020-05-15 20:33                   ` Vivek Goyal
2020-05-15 20:53                     ` Sean Christopherson
2020-05-15 20:43                   ` Sean Christopherson
2020-05-15 22:23                     ` Paolo Bonzini
2020-05-15 23:16                       ` Sean Christopherson
2020-05-21 14:59                       ` Vitaly Kuznetsov
2020-05-22  7:33                         ` Paolo Bonzini
2020-05-12 21:15       ` Vivek Goyal
2020-05-21 18:38   ` Vivek Goyal
2020-05-23 16:34     ` Vitaly Kuznetsov
2020-05-26 12:50       ` Vivek Goyal
2020-05-11 16:47 ` [PATCH 3/8] KVM: introduce kvm_read_guest_offset_cached() Vitaly Kuznetsov
2020-05-11 16:47 ` [PATCH 4/8] KVM: x86: interrupt based APF page-ready event delivery Vitaly Kuznetsov
2020-05-12 14:24   ` Vivek Goyal
2020-05-12 15:50     ` Vitaly Kuznetsov
2020-05-12 18:07       ` Vivek Goyal
2020-05-13  9:03         ` Vitaly Kuznetsov
2020-05-13 13:53           ` Vivek Goyal
2020-05-13 14:03             ` Vivek Goyal
2020-05-13 14:23             ` Vitaly Kuznetsov
2020-05-13 18:46               ` Vivek Goyal
2020-05-14  8:08                 ` Vitaly Kuznetsov
2020-05-14 13:31                   ` Vivek Goyal
2020-05-11 16:47 ` [PATCH 5/8] KVM: x86: acknowledgment mechanism for async pf page ready notifications Vitaly Kuznetsov
2020-05-11 16:47 ` [PATCH 6/8] KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT Vitaly Kuznetsov
2020-05-11 16:47 ` [PATCH 7/8] KVM: x86: Switch KVM guest to using interrupts for page ready APF delivery Vitaly Kuznetsov
2020-05-13  1:44   ` [kbuild-all] " kbuild test robot
2020-05-11 16:47 ` [PATCH 8/8] KVM: x86: drop KVM_PV_REASON_PAGE_READY case from kvm_handle_page_fault() Vitaly Kuznetsov
2020-05-12 15:32 ` [PATCH 0/8] KVM: x86: Interrupt-based mechanism for async_pf 'page present' notifications Vivek Goyal
2020-05-12 16:12   ` Vitaly Kuznetsov
2020-05-13 14:16 ` Vivek Goyal
2020-05-14 18:14   ` Vitaly Kuznetsov

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