Alexander Graf wrote:
In order to find out why things were slow with nested SVM I hacked intercept reporting into debugfs in my local tree and found pretty interesting results (using NPT):
[...]
So apparently the most intercepts come from the SVM helper calls (clgi, stgi, vmload, vmsave). I guess I need to get back to the "emulate when GIF=0" approach to get things fast.
There's only a limited potential here (a factor of three, reducing 6 exits to 2, less the emulation overhead). There's a lot more to be gained from nested npt, since you'll avoid most of the original exits in the first place.
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