[PATCH v9 0/7] KVM: VMX: Add Posted Interrupt supporting

[Yang Zhang <yang.z.zhang@intel.com>]

From: Yang Zhang <yang.z.zhang@Intel.com>

The follwoing patches are adding the Posted Interrupt supporting to KVM:
The first patch enables the feature 'acknowledge interrupt on vmexit'.Since
it is required by Posted interrupt, we need to enable it firstly.

And the subsequent patches are adding the posted interrupt supporting:
Posted Interrupt allows APIC interrupts to inject into guest directly
without any vmexit.

- When delivering a interrupt to guest, if target vcpu is running,
  update Posted-interrupt requests bitmap and send a notification event
  to the vcpu. Then the vcpu will handle this interrupt automatically,
  without any software involvemnt.

- If target vcpu is not running or there already a notification event
  pending in the vcpu, do nothing. The interrupt will be handled by
  next vm entry

Changes from v8 to v9:
* Add tracing in PI case when deliver interrupt.
* Scan ioapic when updating SPIV register.
* Rebase on top of KVM upstream + RTC eoi tracking patch.

Changes from v7 to v8:
* Remove unused memeber 'on' from struct pi_desc.
* Register a dummy function to sync_pir_to_irr is apicv is disabled.
* Minor fixup.
* Rebase on top of KVM upstream + RTC eoi tracking patch.

Yang Zhang (7):
  KVM: VMX: Enable acknowledge interupt on vmexit
  KVM: VMX: Register a new IPI for posted interrupt
  KVM: VMX: Check the posted interrupt capability
  KVM: Call common update function when ioapic entry changed.
  KVM: Set TMR when programming ioapic entry
  KVM: VMX: Add the algorithm of deliver posted interrupt
  KVM: VMX: Use posted interrupt to deliver virtual interrupt

 arch/ia64/kvm/lapic.h              |    6 -
 arch/x86/include/asm/entry_arch.h  |    4 +
 arch/x86/include/asm/hardirq.h     |    3 +
 arch/x86/include/asm/hw_irq.h      |    1 +
 arch/x86/include/asm/irq_vectors.h |    5 +
 arch/x86/include/asm/kvm_host.h    |    3 +
 arch/x86/include/asm/vmx.h         |    4 +
 arch/x86/kernel/entry_64.S         |    5 +
 arch/x86/kernel/irq.c              |   22 ++++
 arch/x86/kernel/irqinit.c          |    4 +
 arch/x86/kvm/lapic.c               |   66 ++++++++----
 arch/x86/kvm/lapic.h               |    7 ++
 arch/x86/kvm/svm.c                 |   12 ++
 arch/x86/kvm/vmx.c                 |  207 +++++++++++++++++++++++++++++++-----
 arch/x86/kvm/x86.c                 |   19 +++-
 include/linux/kvm_host.h           |    4 +-
 virt/kvm/ioapic.c                  |   32 ++++--
 virt/kvm/ioapic.h                  |    7 +-
 virt/kvm/irq_comm.c                |    4 +-
 virt/kvm/kvm_main.c                |    5 +-
 20 files changed, 341 insertions(+), 79 deletions(-)