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Using the KVM API

Using the KVM API

Posted Oct 1, 2015 15:50 UTC (Thu) by josh (subscriber, #17465)
In reply to: Using the KVM API by pbonzini
Parent article: Using the KVM API

Ouch. That really limits how much faster it can get, then, short of implementing the backend in the kernel.

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Using the KVM API

Posted Oct 1, 2015 16:02 UTC (Thu) by pbonzini (subscriber, #60935) [Link]

Even if you implement in the kernel, it's hard to bypass all the stuff that KVM does at vmexit. The processor doesn't restore the whole host state at vmexit time, but KVM must restore at least whatever is needed to run Linux (e.g. the %fs base to access per_cpu variables).


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