[PATCH v5 0/5] Nonatomic interrupt injection

[Avi Kivity <avi@redhat.com>]

This patchset changes interrupt injection to be done from normal process
context instead of interrupts disabled context.  This is useful for real
mode interrupt injection on Intel without the current hacks (injecting as
a software interrupt of a vm86 task), reducing latencies, and later, for
allowing nested virtualization code to use kvm_read_guest()/kvm_write_guest()
instead of kmap() to access the guest vmcb/vmcs.

Seems to survive a hack that cancels every 16th entry, after injection has
already taken place.

With the PIC reset fix posted earlier, this passes autotest on both AMD and
Intel, with in-kernel irqchip.  I'll run -no-kvm-irqchip tests shortly.

Please review carefully, esp. the first patch.  Any missing kvm_make_request()
there may result in a hung guest.

v5: add KVM_REQ_EVENT to KVM_INTERRUPT path
    change first patch to sample KVM_REQ_EVENT before checking vcpu->requests
      for the entry abort path; improves bisectability (noticed by Gleb)

v4: add KVM_REQ_EVENT after lapic restore

v3: close new race between injection and entry
    fix Intel real-mode injection cancellation

v2: svm support (easier than expected)
    fix silly vmx warning

Avi Kivity (5):
  KVM: Check for pending events before attempting injection
  KVM: VMX: Split up vmx_complete_interrupts()
  KVM: VMX: Move real-mode interrupt injection fixup to
    vmx_complete_interrupts()
  KVM: VMX: Parameterize vmx_complete_interrupts() for both exit and
    entry
  KVM: Non-atomic interrupt injection

 arch/x86/include/asm/kvm_host.h |    1 +
 arch/x86/kvm/i8259.c            |    1 +
 arch/x86/kvm/lapic.c            |   13 +++++-
 arch/x86/kvm/svm.c              |   20 ++++++++-
 arch/x86/kvm/vmx.c              |   87 +++++++++++++++++++++++++++++----------
 arch/x86/kvm/x86.c              |   45 ++++++++++++++------
 include/linux/kvm_host.h        |    1 +
 7 files changed, 130 insertions(+), 38 deletions(-)