[PATCH 0/5] KVM: nVMX: Enable nested apicv support.

[Wincy Van]

In nested vmx, the efficiency of interrupt virtualization is
very important, especially in high throughput scenes.

This patch set enables nested apicv support, which makes a
huge improvement in nested interrupt virtualization.

I also have done some simple tests:
L0: Intel Xeon E5-2630 v2
L1: CentOS 6.5 with 3.10.64-1.el6.elrepo.x86_64 kernel
    16 vcpus, 32GB memory.

L2: Windows Server 2008 R2 Datacenter
    8 vcpus, 16GB memory.

 1. Run wprime 32M, 8 threads.

         original                nested apicv

          7.782s                   7.172s

    Improvement: 7.8%

 2. Run iperf -s -w 64k in L1,
    iperf -c 10.1.0.2 -p 5001 -i 1 -t 30 -P 8 -w 64k in L2

         original                nested apicv

        2.12 Gbits/s             3.50 Gbits/s

    Improvement: 65.0%

_________________________________________________________

L2: CentOS 6.5 with 2.6.32-431 kernel
    8 vcpus, 16GB memory.

 1. Run iperf -s -w 64k in L1,
    iperf -c 10.1.0.2 -p 5001 -i 1 -t 30 -P 8 -w 64k in L2

         original                nested apicv

        6.58 Gbits/s             14.2 Gbits/s

    Improvement: 115.8%

Wincy Van (5):
  KVM: nVMX: Make nested control MSRs per-cpu.
  KVM: nVMX: Enable nested virtualize x2apic mode.
  KVM: nVMX: Enable nested apic register virtualization.
  KVM: nVMX: Enable nested virtual interrupt delivery.
  KVM: nVMX: Enable nested posted interrupt processing.

 arch/x86/kvm/vmx.c |  444 +++++++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 355 insertions(+), 89 deletions(-)
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