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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