本文介绍了Viridian接口的主要功能，包括提供MSR访问APIC寄存器及CPU空闲时的超调用。重点讨论了如何通过该接口告知Windows不要期望在所有CPU上都能均匀地传递定时器中断，从而避免了从Vista开始的多vCPU环境下出现STOP 0x101蓝屏的问题。
关于viridian interface
At the moment we provide MSR access to APIC registers, and the hypercall
to yield the CPU when waiting for a spinlock. We looked at a few others
(e.g. address-space-change hypercall) but found the benefits, if any,
were negligible.
The most important part of the interface is that we can use it to tell
Windows not to expect timer interrupt delivery to be as even across all
CPUs as it would be on bare metal. This gets rid of annoying STOP 0x101
bluescreens in multi-vcpu Windows from Vista on.
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