[PATCH v3 0/5] KVM: x86: hyperv: PV IPI support for Windows guests

[Vitaly Kuznetsov]

Changes since v1 [Roman Kagan]:
- Drop vp_index_to_vcpu_idx mapping. get_vcpu_by_vpidx() should be fast
  (1:1 mapping) in all valid use-cases. We'll optimize it later if needed
  (or at least discuss this in a separate patchset).
- "enforce vp_index < KVM_MAX_VCPUS" patch added.
- Issues reported by kbuild are now gone with the PATCH2 from v2.

Using hypercall for sending IPIs is faster because this allows to specify
any number of vCPUs (even > 64 with sparse CPU set), the whole procedure
will take only one VMEXIT.

Same as PV TLB flush, this allows Windows guests having > 64 vCPUs to boot
on KVM when Hyper-V extensions are enabled.

Vitaly Kuznetsov (5):
  KVM: x86: hyperv: enforce vp_index < KVM_MAX_VCPUS
  KVM: x86: hyperv: optimize 'all cpus' case in kvm_hv_flush_tlb()
  KVM: x86: hyperv: use get_vcpu_by_vpidx() in kvm_hv_flush_tlb()
  x86/hyper-v: rename ipi_arg_{ex,non_ex} structures
  KVM: x86: hyperv: implement PV IPI send hypercalls

 Documentation/virtual/kvm/api.txt  |   8 ++
 arch/x86/hyperv/hv_apic.c          |  12 +--
 arch/x86/include/asm/hyperv-tlfs.h |  16 +--
 arch/x86/kvm/hyperv.c              | 194 +++++++++++++++++++++++++++----------
 arch/x86/kvm/trace.h               |  42 ++++++++
 arch/x86/kvm/x86.c                 |   1 +
 include/uapi/linux/kvm.h           |   1 +
 virt/kvm/kvm_main.c                |   6 +-
 8 files changed, 210 insertions(+), 70 deletions(-)

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2.14.4