[PATCH v9 0/2] kvm: x86: hyperv: guest->host event signaling via eventfd

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Make it possible for guests using Hyper-V emulation to do guest->host
notification via EVENT_SIGNAL hypercall without a user exit.

Special thanks to David Hildenbrand for going through the spec with me
to figure out the desired behavior.

v8 -> v9:
 - pass events with non-zero FlagNumber to userspace

v7 -> v8:
 - rebase to latest master

v6 -> v7:
 - reject non-zero flag number as invalid
 - adjust error returns to better match the spec

v5 -> v6:
 - drop unnecessary srcu_read_lock/unlock, and clean up after that

v4 -> v5:
 - fix block comment formatting

v3 -> v4:
 - switch to kvm_vcpu_read_guest and take srcu_read_lock around it
 - rework and document the interpretation of the hypercall parameter
 - merge !fast version into kvm_hvcall_signal_event for brevity

v2 -> v3:
 - expand docs on allowed values and return codes
 - fix uninitialized return
 - style fixes

v1 -> v2:
 - make data types consistent
 - get by without the recently dropped struct hv_input_signal_event
 - fix subject prefixes

Roman Kagan (2):
  kvm: x86: factor out kvm.arch.hyperv (de)init
  kvm: x86: hyperv: guest->host event signaling via eventfd

 Documentation/virtual/kvm/api.txt  |  31 ++++++++++
 arch/x86/include/asm/kvm_host.h    |   2 +
 arch/x86/include/uapi/asm/hyperv.h |   2 +
 arch/x86/kvm/hyperv.h              |   4 ++
 include/uapi/linux/kvm.h           |  13 +++++
 arch/x86/kvm/hyperv.c              | 112 ++++++++++++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c                 |  13 ++++-
 7 files changed, 175 insertions(+), 2 deletions(-)

-- 
2.14.3




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